Re: [syzbot] [mm?] [exfat?] [f2fs?] memory leak in __kfree_rcu_sheaf

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
memory leak in __pcs_replace_empty_main

BUG: memory leak
unreferenced object 0xffff88810005f600 (size 512):
  comm "swapper/0", pid 0, jiffies 4294937296
  hex dump (first 32 bytes):
    e0 e2 ee 2c 81 88 ff ff a0 13 ad 81 ff ff ff ff  ...,............
    00 12 04 00 81 88 ff ff 3c 00 00 00 00 00 00 00  ........<.......
  backtrace (crc 2486057c):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    __do_kmalloc_node mm/slub.c:5294 [inline]
    __kmalloc_noprof+0x3b7/0x550 mm/slub.c:5307
    kmalloc_noprof include/linux/slab.h:954 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2768
    alloc_empty_sheaf mm/slub.c:2783 [inline]
    __pcs_replace_empty_main+0x22a/0x2a0 mm/slub.c:4646
    alloc_from_pcs mm/slub.c:4749 [inline]
    slab_alloc_node mm/slub.c:4883 [inline]
    __kmalloc_cache_noprof+0x3a6/0x480 mm/slub.c:5410
    kmalloc_noprof include/linux/slab.h:950 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    __irq_domain_alloc_fwnode+0x37/0x140 kernel/irq/irqdomain.c:95
    irq_domain_alloc_named_fwnode include/linux/irqdomain.h:271 [inline]
    arch_early_irq_init+0x1c/0x70 arch/x86/kernel/apic/vector.c:803
    start_kernel+0x931/0xb80 init/main.c:1123
    x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
    x86_64_start_kernel+0xce/0xd0 arch/x86/kernel/head64.c:291
    common_startup_64+0x13e/0x148

BUG: memory leak
unreferenced object 0xffff888101d04e00 (size 512):
  comm "kworker/u8:5", pid 311, jiffies 4294937428
  hex dump (first 32 bytes):
    b8 1c b8 28 81 88 ff ff a0 13 ad 81 ff ff ff ff  ...(............
    00 12 04 00 81 88 ff ff 3c 00 00 00 00 00 00 00  ........<.......
  backtrace (crc 1d48d83d):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    __do_kmalloc_node mm/slub.c:5294 [inline]
    __kmalloc_noprof+0x3b7/0x550 mm/slub.c:5307
    kmalloc_noprof include/linux/slab.h:954 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2768
    alloc_empty_sheaf mm/slub.c:2783 [inline]
    __pcs_replace_full_main+0xdf/0x300 mm/slub.c:5757
    free_to_pcs mm/slub.c:5810 [inline]
    slab_free mm/slub.c:6249 [inline]
    kfree+0x361/0x3a0 mm/slub.c:6561
    call_usermodehelper_freeinfo kernel/umh.c:43 [inline]
    umh_complete kernel/umh.c:57 [inline]
    call_usermodehelper_exec_async+0x1c7/0x1f0 kernel/umh.c:119
    ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

BUG: memory leak
unreferenced object 0xffff888101d18800 (size 512):
  comm "kworker/0:1", pid 10, jiffies 4294937813
  hex dump (first 32 bytes):
    00 c8 ec 0b 81 88 ff ff 00 18 d3 0b 81 88 ff ff  ................
    00 12 04 00 81 88 ff ff 00 00 00 00 00 00 00 00  ................
  backtrace (crc 307f46be):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    __do_kmalloc_node mm/slub.c:5294 [inline]
    __kmalloc_noprof+0x3b7/0x550 mm/slub.c:5307
    kmalloc_noprof include/linux/slab.h:954 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2768
    alloc_empty_sheaf mm/slub.c:2783 [inline]
    __pcs_replace_full_main+0xdf/0x300 mm/slub.c:5757
    free_to_pcs mm/slub.c:5810 [inline]
    slab_free mm/slub.c:6249 [inline]
    kfree+0x361/0x3a0 mm/slub.c:6561
    vfree mm/vmalloc.c:3476 [inline]
    vfree+0x14d/0x3d0 mm/vmalloc.c:3436
    delayed_vfree_work+0x29/0x40 mm/vmalloc.c:3392
    process_one_work+0x277/0x5b0 kernel/workqueue.c:3302
    process_scheduled_works kernel/workqueue.c:3385 [inline]
    worker_thread+0x255/0x4a0 kernel/workqueue.c:3466
    kthread+0x14e/0x1a0 kernel/kthread.c:436
    ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

BUG: memory leak
unreferenced object 0xffff888101d2be00 (size 512):
  comm "kworker/0:1", pid 10, jiffies 4294937856
  hex dump (first 32 bytes):
    c8 2c 04 00 81 88 ff ff 00 90 b7 2a 81 88 ff ff  .,.........*....
    00 12 04 00 81 88 ff ff 3c 00 00 00 00 00 00 00  ........<.......
  backtrace (crc 9ff75ca2):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    __do_kmalloc_node mm/slub.c:5294 [inline]
    __kmalloc_noprof+0x3b7/0x550 mm/slub.c:5307
    kmalloc_noprof include/linux/slab.h:954 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2768
    alloc_empty_sheaf mm/slub.c:2783 [inline]
    __pcs_replace_full_main+0xdf/0x300 mm/slub.c:5757
    free_to_pcs mm/slub.c:5810 [inline]
    slab_free mm/slub.c:6249 [inline]
    kfree+0x361/0x3a0 mm/slub.c:6561
    vfree mm/vmalloc.c:3476 [inline]
    vfree+0x14d/0x3d0 mm/vmalloc.c:3436
    delayed_vfree_work+0x29/0x40 mm/vmalloc.c:3392
    process_one_work+0x277/0x5b0 kernel/workqueue.c:3302
    process_scheduled_works kernel/workqueue.c:3385 [inline]
    worker_thread+0x255/0x4a0 kernel/workqueue.c:3466
    kthread+0x14e/0x1a0 kernel/kthread.c:436
    ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

BUG: memory leak
unreferenced object 0xffff888101d2b000 (size 512):
  comm "kworker/u8:9", pid 4643, jiffies 4294937873
  hex dump (first 32 bytes):
    00 72 5a 03 81 88 ff ff c8 2c 04 00 81 88 ff ff  .rZ......,......
    00 12 04 00 81 88 ff ff 3c 00 00 00 00 00 00 00  ........<.......
  backtrace (crc bcccad5b):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    __do_kmalloc_node mm/slub.c:5294 [inline]
    __kmalloc_noprof+0x3b7/0x550 mm/slub.c:5307
    kmalloc_noprof include/linux/slab.h:954 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2768
    alloc_empty_sheaf mm/slub.c:2783 [inline]
    __pcs_replace_full_main+0xdf/0x300 mm/slub.c:5757
    free_to_pcs mm/slub.c:5810 [inline]
    slab_free mm/slub.c:6249 [inline]
    kfree+0x361/0x3a0 mm/slub.c:6561
    call_usermodehelper_freeinfo kernel/umh.c:43 [inline]
    umh_complete kernel/umh.c:57 [inline]
    call_usermodehelper_exec_async+0x1c7/0x1f0 kernel/umh.c:119
    ret_from_fork+0x219/0x490 arch/x86/kernel/process.c:158
    ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

BUG: memory leak
unreferenced object 0xffff8881035a7400 (size 512):
  comm "udevadm", pid 4981, jiffies 4294938333
  hex dump (first 32 bytes):
    00 88 b7 2a 81 88 ff ff 00 4e d0 01 81 88 ff ff  ...*.....N......
    00 12 04 00 81 88 ff ff 00 00 00 00 00 00 00 00  ................
  backtrace (crc 82d289ee):
    kmemleak_alloc_recursive include/linux/kmemleak.h:44 [inline]
    slab_post_alloc_hook mm/slub.c:4574 [inline]
    slab_alloc_node mm/slub.c:4898 [inline]
    __do_kmalloc_node mm/slub.c:5294 [inline]
    __kmalloc_noprof+0x3b7/0x550 mm/slub.c:5307
    kmalloc_noprof include/linux/slab.h:954 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    __alloc_empty_sheaf+0x35/0x50 mm/slub.c:2768
    alloc_empty_sheaf mm/slub.c:2783 [inline]
    __pcs_replace_empty_main+0x22a/0x2a0 mm/slub.c:4646
    alloc_from_pcs mm/slub.c:4749 [inline]
    slab_alloc_node mm/slub.c:4883 [inline]
    __kmalloc_cache_noprof+0x3a6/0x480 mm/slub.c:5410
    kmalloc_noprof include/linux/slab.h:950 [inline]
    kzalloc_noprof include/linux/slab.h:1188 [inline]
    kernfs_get_open_node fs/kernfs/file.c:543 [inline]
    kernfs_fop_open+0x4f4/0x580 fs/kernfs/file.c:718
    do_dentry_open+0x1fc/0x8c0 fs/open.c:947
    vfs_open+0x3d/0x1b0 fs/open.c:1079
    do_open fs/namei.c:4699 [inline]
    path_openat+0x154d/0x1e20 fs/namei.c:4858
    do_file_open+0x121/0x200 fs/namei.c:4887
    do_sys_openat2+0xa5/0x140 fs/open.c:1364
    do_sys_open fs/open.c:1370 [inline]
    __do_sys_openat fs/open.c:1386 [inline]
    __se_sys_openat fs/open.c:1381 [inline]
    __x64_sys_openat+0x82/0xf0 fs/open.c:1381
    do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
    do_syscall_64+0xee/0xf80 arch/x86/entry/syscall_64.c:94
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

connection error: failed to recv *flatrpc.ExecutorMessageRawT: EOF


Tested on:

commit:         66edb901 Merge tag 'v7.1-p3' of git://git.kernel.org/p..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13db0ad2580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9645c21cfd1d3e8f
dashboard link: https://syzkaller.appspot.com/bug?extid=cae7809e9dc1459e4e63
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
patch:          https://syzkaller.appspot.com/x/patch.diff?x=153b7ece580000