Re: memory leak in v9fs_session_init

[Dmitry Vyukov]

 On Wed, Jul 24, 2019 at 2:08 PM syzbot
<syzbot+15b759334fd44cd9785a@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    abdfd52a Merge tag 'armsoc-defconfig' of git://git.kernel...
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=163046afa00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d31de3d88059b7fa
> dashboard link: https://syzkaller.appspot.com/bug?extid=15b759334fd44cd9785a
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1735466c600000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=117e0cf0600000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+15b759334fd44cd9785a@xxxxxxxxxxxxxxxxxxxxxxxxx

+fs/9p/v9fs.c maintainers

> BUG: memory leak
> unreferenced object 0xffff88811181c360 (size 32):
>    comm "syz-executor114", pid 7075, jiffies 4294946393 (age 16.360s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 46 04 00 ea ff ff 80 4a 46 04 00 ea ff ff  r.F......JF.....
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff8881109294a0 (size 32):
>    comm "syz-executor114", pid 7076, jiffies 4294946394 (age 16.350s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  r...............
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff888110929b40 (size 32):
>    comm "syz-executor114", pid 7080, jiffies 4294946394 (age 16.350s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  r...............
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff8881109292a0 (size 32):
>    comm "syz-executor114", pid 7081, jiffies 4294946395 (age 16.340s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 6b 65 72 6e 65 6c 5f 74 3a 73 30 00 00 00  r.kernel_t:s0...
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff88811181c360 (size 32):
>    comm "syz-executor114", pid 7075, jiffies 4294946393 (age 16.410s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 46 04 00 ea ff ff 80 4a 46 04 00 ea ff ff  r.F......JF.....
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff8881109294a0 (size 32):
>    comm "syz-executor114", pid 7076, jiffies 4294946394 (age 16.400s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  r...............
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff888110929b40 (size 32):
>    comm "syz-executor114", pid 7080, jiffies 4294946394 (age 16.400s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  r...............
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff8881109292a0 (size 32):
>    comm "syz-executor114", pid 7081, jiffies 4294946395 (age 16.390s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 6b 65 72 6e 65 6c 5f 74 3a 73 30 00 00 00  r.kernel_t:s0...
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff88811181c360 (size 32):
>    comm "syz-executor114", pid 7075, jiffies 4294946393 (age 17.280s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 46 04 00 ea ff ff 80 4a 46 04 00 ea ff ff  r.F......JF.....
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff8881109294a0 (size 32):
>    comm "syz-executor114", pid 7076, jiffies 4294946394 (age 17.270s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  r...............
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff888110929b40 (size 32):
>    comm "syz-executor114", pid 7080, jiffies 4294946394 (age 17.270s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  r...............
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff8881109292a0 (size 32):
>    comm "syz-executor114", pid 7081, jiffies 4294946395 (age 17.260s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 6b 65 72 6e 65 6c 5f 74 3a 73 30 00 00 00  r.kernel_t:s0...
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff88811181c360 (size 32):
>    comm "syz-executor114", pid 7075, jiffies 4294946393 (age 18.150s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 46 04 00 ea ff ff 80 4a 46 04 00 ea ff ff  r.F......JF.....
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff8881109294a0 (size 32):
>    comm "syz-executor114", pid 7076, jiffies 4294946394 (age 18.140s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  r...............
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff888110929b40 (size 32):
>    comm "syz-executor114", pid 7080, jiffies 4294946394 (age 18.140s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  r...............
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff8881109292a0 (size 32):
>    comm "syz-executor114", pid 7081, jiffies 4294946395 (age 18.130s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 6b 65 72 6e 65 6c 5f 74 3a 73 30 00 00 00  r.kernel_t:s0...
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff88811181c360 (size 32):
>    comm "syz-executor114", pid 7075, jiffies 4294946393 (age 19.020s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 46 04 00 ea ff ff 80 4a 46 04 00 ea ff ff  r.F......JF.....
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff8881109294a0 (size 32):
>    comm "syz-executor114", pid 7076, jiffies 4294946394 (age 19.010s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  r...............
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff888110929b40 (size 32):
>    comm "syz-executor114", pid 7080, jiffies 4294946394 (age 19.010s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  r...............
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff8881109292a0 (size 32):
>    comm "syz-executor114", pid 7081, jiffies 4294946395 (age 19.000s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 6b 65 72 6e 65 6c 5f 74 3a 73 30 00 00 00  r.kernel_t:s0...
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff88811181c360 (size 32):
>    comm "syz-executor114", pid 7075, jiffies 4294946393 (age 19.070s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 46 04 00 ea ff ff 80 4a 46 04 00 ea ff ff  r.F......JF.....
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff8881109294a0 (size 32):
>    comm "syz-executor114", pid 7076, jiffies 4294946394 (age 19.060s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  r...............
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff888110929b40 (size 32):
>    comm "syz-executor114", pid 7080, jiffies 4294946394 (age 19.060s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  r...............
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> BUG: memory leak
> unreferenced object 0xffff8881109292a0 (size 32):
>    comm "syz-executor114", pid 7081, jiffies 4294946395 (age 19.050s)
>    hex dump (first 32 bytes):
>      77 66 64 6e 6f 25 61 63 63 65 73 73 3d 75 73 65  wfdno%access=use
>      72 00 6b 65 72 6e 65 6c 5f 74 3a 73 30 00 00 00  r.kernel_t:s0...
>    backtrace:
>      [<00000000830cd797>] kmemleak_alloc_recursive
> /./include/linux/kmemleak.h:43 [inline]
>      [<00000000830cd797>] slab_post_alloc_hook /mm/slab.h:522 [inline]
>      [<00000000830cd797>] slab_alloc /mm/slab.c:3319 [inline]
>      [<00000000830cd797>] __do_kmalloc /mm/slab.c:3653 [inline]
>      [<00000000830cd797>] __kmalloc_track_caller+0x165/0x300 /mm/slab.c:3670
>      [<000000004c2bde0e>] kmemdup_nul+0x31/0x80 /mm/util.c:143
>      [<00000000d3b2a6b1>] match_strdup+0x21/0x30 /lib/parser.c:322
>      [<00000000cb5a9103>] v9fs_parse_options /fs/9p/v9fs.c:281 [inline]
>      [<00000000cb5a9103>] v9fs_session_init+0x29e/0x880 /fs/9p/v9fs.c:422
>      [<0000000060a9624b>] v9fs_mount+0x5e/0x3a0 /fs/9p/vfs_super.c:120
>      [<0000000045c47d3a>] legacy_get_tree+0x27/0x80 /fs/fs_context.c:661
>      [<00000000966bd655>] vfs_get_tree+0x2e/0x110 /fs/super.c:1416
>      [<000000004bdabb83>] do_new_mount /fs/namespace.c:2795 [inline]
>      [<000000004bdabb83>] do_mount+0x94e/0xc70 /fs/namespace.c:3115
>      [<000000008f276989>] ksys_mount+0xab/0x120 /fs/namespace.c:3324
>      [<000000003dd28c22>] __do_sys_mount /fs/namespace.c:3338 [inline]
>      [<000000003dd28c22>] __se_sys_mount /fs/namespace.c:3335 [inline]
>      [<000000003dd28c22>] __x64_sys_mount+0x26/0x30 /fs/namespace.c:3335
>      [<00000000b6179601>] do_syscall_64+0x76/0x1a0
> /arch/x86/entry/common.c:296
>      [<000000005924437c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> executing program
> executing program
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxxx
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>
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