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* [f2fs-dev] [syzbot] [f2fs?] possible deadlock in f2fs_release_file (2)
@ 2024-08-16  9:16 syzbot
  2024-09-05  1:48 ` Chao Yu via Linux-f2fs-devel
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2024-08-16  9:16 UTC (permalink / raw)
  To: chao, jaegeuk, linux-f2fs-devel, linux-kernel, syzkaller-bugs

Hello,

syzbot found the following issue on:

HEAD commit:    9e6869691724 Add linux-next specific files for 20240812
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1203caf3980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=61ba6f3b22ee5467
dashboard link: https://syzkaller.appspot.com/bug?extid=9aff3b6811f0a00daffa
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f1b086192f50/disk-9e686969.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b457920fb52e/vmlinux-9e686969.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e63ba9cce98a/bzImage-9e686969.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9aff3b6811f0a00daffa@syzkaller.appspotmail.com

F2FS-fs (loop0): Try to recover 1th superblock, ret: 0
F2FS-fs (loop0): Mounted with checkpoint version = 48b305e5
syz.0.98: attempt to access beyond end of device
loop0: rw=2049, sector=45096, nr_sectors = 8 limit=40427
======================================================
WARNING: possible circular locking dependency detected
6.11.0-rc3-next-20240812-syzkaller #0 Not tainted
------------------------------------------------------
syz.0.98/5917 is trying to acquire lock:
ffff88807896ad30 (&sb->s_type->i_mutex_key#26){++++}-{3:3}, at: inode_lock include/linux/fs.h:799 [inline]
ffff88807896ad30 (&sb->s_type->i_mutex_key#26){++++}-{3:3}, at: f2fs_release_file+0x9b/0x100 fs/f2fs/file.c:1940

but task is already holding lock:
ffff88807896b308 (&fi->i_gc_rwsem[WRITE]){++++}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2196 [inline]
ffff88807896b308 (&fi->i_gc_rwsem[WRITE]){++++}-{3:3}, at: f2fs_commit_atomic_write+0x105/0x1510 fs/f2fs/segment.c:388

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&fi->i_gc_rwsem[WRITE]){++++}-{3:3}:
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762
       down_write+0x99/0x220 kernel/locking/rwsem.c:1579
       f2fs_down_write fs/f2fs/f2fs.h:2196 [inline]
       f2fs_setattr+0xb80/0x12d0 fs/f2fs/file.c:1060
       notify_change+0xb9d/0xe70 fs/attr.c:535
       do_truncate+0x220/0x310 fs/open.c:65
       handle_truncate fs/namei.c:3395 [inline]
       do_open fs/namei.c:3745 [inline]
       path_openat+0x2ced/0x3470 fs/namei.c:3900
       do_filp_open+0x235/0x490 fs/namei.c:3927
       do_sys_openat2+0x13e/0x1d0 fs/open.c:1416
       do_sys_open fs/open.c:1431 [inline]
       __do_sys_creat fs/open.c:1507 [inline]
       __se_sys_creat fs/open.c:1501 [inline]
       __x64_sys_creat+0x123/0x170 fs/open.c:1501
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&sb->s_type->i_mutex_key#26){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3136 [inline]
       check_prevs_add kernel/locking/lockdep.c:3255 [inline]
       validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3871
       __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5145
       lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762
       down_write+0x99/0x220 kernel/locking/rwsem.c:1579
       inode_lock include/linux/fs.h:799 [inline]
       f2fs_release_file+0x9b/0x100 fs/f2fs/file.c:1940
       __fput+0x24a/0x8a0 fs/file_table.c:425
       task_work_run+0x24f/0x310 kernel/task_work.c:228
       get_signal+0x16ad/0x1810 kernel/signal.c:2690
       arch_do_signal_or_restart+0x96/0x830 arch/x86/kernel/signal.c:337
       exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
       exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
       __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
       syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
       do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&fi->i_gc_rwsem[WRITE]);
                               lock(&sb->s_type->i_mutex_key#26);
                               lock(&fi->i_gc_rwsem[WRITE]);
  lock(&sb->s_type->i_mutex_key#26);

 *** DEADLOCK ***

1 lock held by syz.0.98/5917:
 #0: ffff88807896b308 (&fi->i_gc_rwsem[WRITE]){++++}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2196 [inline]
 #0: ffff88807896b308 (&fi->i_gc_rwsem[WRITE]){++++}-{3:3}, at: f2fs_commit_atomic_write+0x105/0x1510 fs/f2fs/segment.c:388

stack backtrace:
CPU: 0 UID: 0 PID: 5917 Comm: syz.0.98 Not tainted 6.11.0-rc3-next-20240812-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2189
 check_prev_add kernel/locking/lockdep.c:3136 [inline]
 check_prevs_add kernel/locking/lockdep.c:3255 [inline]
 validate_chain+0x18e0/0x5900 kernel/locking/lockdep.c:3871
 __lock_acquire+0x137a/0x2040 kernel/locking/lockdep.c:5145
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5762
 down_write+0x99/0x220 kernel/locking/rwsem.c:1579
 inode_lock include/linux/fs.h:799 [inline]
 f2fs_release_file+0x9b/0x100 fs/f2fs/file.c:1940
 __fput+0x24a/0x8a0 fs/file_table.c:425
 task_work_run+0x24f/0x310 kernel/task_work.c:228
 get_signal+0x16ad/0x1810 kernel/signal.c:2690
 arch_do_signal_or_restart+0x96/0x830 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1c8c1779f9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1c8d01f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: fffffffffffffffb RBX: 00007f1c8c305f80 RCX: 00007f1c8c1779f9
RDX: 0000000000000000 RSI: 000000000000f502 RDI: 0000000000000004
RBP: 00007f1c8c1e58ee R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f1c8c305f80 R15: 00007ffdbf6238f8
 </TASK>


---
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2024-08-16  9:16 [f2fs-dev] [syzbot] [f2fs?] possible deadlock in f2fs_release_file (2) syzbot
2024-09-05  1:48 ` Chao Yu via Linux-f2fs-devel

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