[syzbot] [f2fs?] possible deadlock in f2fs_vm_page_mkwrite

From: syzbot
Date: Wed Dec 28 2022 - 02:16:10 EST

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Hello,

syzbot found the following issue on:

HEAD commit: a27405b2ed9c Merge tag 'sound-6.2-rc1-2' of git://git.kern..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=179bf81f880000
kernel config: https://syzkaller.appspot.com/x/.config?x=b0e81c4eb13a67cd
dashboard link: https://syzkaller.appspot.com/bug?extid=fb4ca11228cf7fef7938
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/a20faa4894d9/disk-a27405b2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ab24ee3f0e4b/vmlinux-a27405b2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8d684f455dae/bzImage-a27405b2.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fb4ca11228cf7fef7938@xxxxxxxxxxxxxxxxxxxxxxxxx

======================================================
WARNING: possible circular locking dependency detected
6.1.0-syzkaller-14565-ga27405b2ed9c #0 Not tainted
------------------------------------------------------
syz-executor.2/24424 is trying to acquire lock:
ffff888083cd8670 (mapping.invalidate_lock#5){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:811 [inline]
ffff888083cd8670 (mapping.invalidate_lock#5){++++}-{3:3}, at: f2fs_vm_page_mkwrite+0x630/0x1c90 fs/f2fs/file.c:104

but task is already holding lock:
ffff888085076558 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x19b/0x680 mm/memory.c:2947

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #6 (sb_pagefaults#2){.+.+}-{0:0}:
percpu_down_read include/linux/percpu-rwsem.h:51 [inline]
__sb_start_write include/linux/fs.h:1811 [inline]
sb_start_pagefault include/linux/fs.h:1915 [inline]
f2fs_vm_page_mkwrite+0x48a/0x1c90 fs/f2fs/file.c:99
do_page_mkwrite+0x19b/0x680 mm/memory.c:2947
wp_page_shared mm/memory.c:3295 [inline]
do_wp_page+0x353/0x3370 mm/memory.c:3377
handle_pte_fault mm/memory.c:4949 [inline]
__handle_mm_fault+0x1f58/0x3c90 mm/memory.c:5073
handle_mm_fault+0x1b6/0x850 mm/memory.c:5219
do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1428
handle_page_fault arch/x86/mm/fault.c:1519 [inline]
exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1575
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

-> #5 (&mm->mmap_lock){++++}-{3:3}:
__might_fault mm/memory.c:5647 [inline]
__might_fault+0x10c/0x180 mm/memory.c:5640
_copy_to_user+0x29/0x150 lib/usercopy.c:29
copy_to_user include/linux/uaccess.h:169 [inline]
f2fs_ioc_get_encryption_pwsalt+0x2b2/0x370 fs/f2fs/file.c:2365
__f2fs_ioctl+0x29f1/0xaaf0 fs/f2fs/file.c:4169
f2fs_ioctl+0x18e/0x220 fs/f2fs/file.c:4242
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #4 (&sbi->sb_lock){++++}-{3:3}:
down_write+0x94/0x220 kernel/locking/rwsem.c:1562
f2fs_down_write fs/f2fs/f2fs.h:2213 [inline]
f2fs_handle_error+0x8e/0x200 fs/f2fs/super.c:3926
check_block_count+0x440/0x4f0 fs/f2fs/segment.h:765
build_sit_entries fs/f2fs/segment.c:4471 [inline]
f2fs_build_segment_manager+0x5a08/0xa650 fs/f2fs/segment.c:5162
f2fs_fill_super+0x3aba/0x7680 fs/f2fs/super.c:4328
mount_bdev+0x351/0x410 fs/super.c:1359
legacy_get_tree+0x109/0x220 fs/fs_context.c:610
vfs_get_tree+0x8d/0x2f0 fs/super.c:1489
do_new_mount fs/namespace.c:3145 [inline]
path_mount+0x132a/0x1e20 fs/namespace.c:3475
do_mount fs/namespace.c:3488 [inline]
__do_sys_mount fs/namespace.c:3697 [inline]
__se_sys_mount fs/namespace.c:3674 [inline]
__x64_sys_mount+0x283/0x300 fs/namespace.c:3674
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #3 (&array[i].journal_rwsem){++++}-{3:3}:
down_read+0x9c/0x450 kernel/locking/rwsem.c:1509
scan_curseg_cache+0xa7/0x3b0 fs/f2fs/node.c:2404
__f2fs_build_free_nids+0x761/0xe10 fs/f2fs/node.c:2516
f2fs_build_free_nids fs/f2fs/node.c:2531 [inline]
f2fs_build_node_manager+0x2007/0x2fb0 fs/f2fs/node.c:3316
f2fs_fill_super+0x3ade/0x7680 fs/f2fs/super.c:4334
mount_bdev+0x351/0x410 fs/super.c:1359
legacy_get_tree+0x109/0x220 fs/fs_context.c:610
vfs_get_tree+0x8d/0x2f0 fs/super.c:1489
do_new_mount fs/namespace.c:3145 [inline]
path_mount+0x132a/0x1e20 fs/namespace.c:3475
do_mount fs/namespace.c:3488 [inline]
__do_sys_mount fs/namespace.c:3697 [inline]
__se_sys_mount fs/namespace.c:3674 [inline]
__x64_sys_mount+0x283/0x300 fs/namespace.c:3674
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #2 (&nm_i->nat_tree_lock){++++}-{3:3}:
down_read+0x9c/0x450 kernel/locking/rwsem.c:1509
f2fs_down_read fs/f2fs/f2fs.h:2188 [inline]
f2fs_get_node_info+0x1ac/0x1070 fs/f2fs/node.c:564
f2fs_do_write_data_page+0x7f5/0x1e20 fs/f2fs/data.c:2728
f2fs_write_single_data_page+0x13f0/0x1920 fs/f2fs/data.c:2863
f2fs_write_cache_pages+0xaa8/0x2010 fs/f2fs/data.c:3115
__f2fs_write_data_pages fs/f2fs/data.c:3265 [inline]
f2fs_write_data_pages+0x4c7/0x1230 fs/f2fs/data.c:3292
do_writepages+0x1af/0x690 mm/page-writeback.c:2581
filemap_fdatawrite_wbc mm/filemap.c:388 [inline]
filemap_fdatawrite_wbc+0x147/0x1b0 mm/filemap.c:378
__filemap_fdatawrite_range+0xb8/0xf0 mm/filemap.c:421
file_write_and_wait_range+0xce/0x140 mm/filemap.c:777
f2fs_do_sync_file+0x3a4/0x2a20 fs/f2fs/file.c:275
f2fs_sync_file+0x13a/0x190 fs/f2fs/file.c:393
vfs_fsync_range+0x13e/0x230 fs/sync.c:188
generic_write_sync include/linux/fs.h:2882 [inline]
f2fs_file_write_iter+0x1840/0x31c0 fs/f2fs/file.c:4721
call_write_iter include/linux/fs.h:2186 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x9ed/0xdd0 fs/read_write.c:584
ksys_write+0x12b/0x250 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #1 (&sbi->cp_rwsem){++++}-{3:3}:
down_read+0x9c/0x450 kernel/locking/rwsem.c:1509
f2fs_down_read fs/f2fs/f2fs.h:2188 [inline]
f2fs_lock_op fs/f2fs/f2fs.h:2231 [inline]
f2fs_do_truncate_blocks+0x6ae/0x11e0 fs/f2fs/file.c:688
f2fs_truncate_blocks+0x7b/0x310 fs/f2fs/file.c:751
f2fs_truncate.part.0+0x498/0x7c0 fs/f2fs/file.c:803
f2fs_truncate include/linux/fs.h:806 [inline]
f2fs_setattr+0x1b00/0x2350 fs/f2fs/file.c:1010
notify_change+0xca7/0x1420 fs/attr.c:482
do_truncate+0x143/0x200 fs/open.c:65
handle_truncate fs/namei.c:3216 [inline]
do_open fs/namei.c:3561 [inline]
path_openat+0x2157/0x2a50 fs/namei.c:3714
do_filp_open+0x1ba/0x410 fs/namei.c:3741
do_sys_openat2+0x16d/0x4c0 fs/open.c:1310
do_sys_open fs/open.c:1326 [inline]
__do_sys_openat fs/open.c:1342 [inline]
__se_sys_openat fs/open.c:1337 [inline]
__x64_sys_openat+0x143/0x1f0 fs/open.c:1337
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (mapping.invalidate_lock#5){++++}-{3:3}:
check_prev_add kernel/locking/lockdep.c:3097 [inline]
check_prevs_add kernel/locking/lockdep.c:3216 [inline]
validate_chain kernel/locking/lockdep.c:3831 [inline]
__lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055
lock_acquire kernel/locking/lockdep.c:5668 [inline]
lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
down_read+0x9c/0x450 kernel/locking/rwsem.c:1509
filemap_invalidate_lock_shared include/linux/fs.h:811 [inline]
f2fs_vm_page_mkwrite+0x630/0x1c90 fs/f2fs/file.c:104
do_page_mkwrite+0x19b/0x680 mm/memory.c:2947
wp_page_shared mm/memory.c:3295 [inline]
do_wp_page+0x353/0x3370 mm/memory.c:3377
handle_pte_fault mm/memory.c:4949 [inline]
__handle_mm_fault+0x1f58/0x3c90 mm/memory.c:5073
handle_mm_fault+0x1b6/0x850 mm/memory.c:5219
do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1428
handle_page_fault arch/x86/mm/fault.c:1519 [inline]
exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1575
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

other info that might help us debug this:

Chain exists of:
mapping.invalidate_lock#5 --> &mm->mmap_lock --> sb_pagefaults#2

Possible unsafe locking scenario:

CPU0 CPU1
---- ----
lock(sb_pagefaults#2);
lock(&mm->mmap_lock);
lock(sb_pagefaults#2);
lock(mapping.invalidate_lock#5);

*** DEADLOCK ***

2 locks held by syz-executor.2/24424:
#0: ffff88808236aa58 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88808236aa58 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x276/0x1210 arch/x86/mm/fault.c:1369
#1: ffff888085076558 (sb_pagefaults#2){.+.+}-{0:0}, at: do_page_mkwrite+0x19b/0x680 mm/memory.c:2947

stack backtrace:
CPU: 1 PID: 24424 Comm: syz-executor.2 Not tainted 6.1.0-syzkaller-14565-ga27405b2ed9c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2177
check_prev_add kernel/locking/lockdep.c:3097 [inline]
check_prevs_add kernel/locking/lockdep.c:3216 [inline]
validate_chain kernel/locking/lockdep.c:3831 [inline]
__lock_acquire+0x2a43/0x56d0 kernel/locking/lockdep.c:5055
lock_acquire kernel/locking/lockdep.c:5668 [inline]
lock_acquire+0x1e3/0x630 kernel/locking/lockdep.c:5633
down_read+0x9c/0x450 kernel/locking/rwsem.c:1509
filemap_invalidate_lock_shared include/linux/fs.h:811 [inline]
f2fs_vm_page_mkwrite+0x630/0x1c90 fs/f2fs/file.c:104
do_page_mkwrite+0x19b/0x680 mm/memory.c:2947
wp_page_shared mm/memory.c:3295 [inline]
do_wp_page+0x353/0x3370 mm/memory.c:3377
handle_pte_fault mm/memory.c:4949 [inline]
__handle_mm_fault+0x1f58/0x3c90 mm/memory.c:5073
handle_mm_fault+0x1b6/0x850 mm/memory.c:5219
do_user_addr_fault+0x475/0x1210 arch/x86/mm/fault.c:1428
handle_page_fault arch/x86/mm/fault.c:1519 [inline]
exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1575
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7f7704e2bd49
Code: 48 8b 04 24 48 85 c0 74 17 48 8b 54 24 18 48 0f ca 48 89 54 24 18 48 83 f8 01 0f 85 9b 02 00 00 48 8b 44 24 10 48 8b 54 24 18 <48> 89 10 e9 c2 fd ff ff 48 8b 44 24 10 0f b7 10 48 8b 04 24 48 85
RSP: 002b:00007fff6cf850f0 EFLAGS: 00010246
RAX: 00000000200015c0 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000020000080 RSI: 0000000000000000 RDI: 000055555625c2e8
RBP: 00007fff6cf851e8 R08: 0000000000000000 R09: 0000000000000000
R10: 00007f7704a08208 R11: 0000000000000246 R12: 00000000000f9793
R13: 00007fff6cf85210 R14: 00007f7704fac050 R15: 0000000000000032
</TASK>

---
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