REISERFS (device loop4): checking transaction log (loop4)
REISERFS (device loop4): Using r5 hash to sort names
reiserfs: enabling write barrier flush mode
REISERFS (device loop4): Created .reiserfs_priv - reserved for xattr storage.
======================================================
WARNING: possible circular locking dependency detected
6.3.0-next-20230426-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.4/26405 is trying to acquire lock:
ffff88801e51e468 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0xb2/0x190 mm/memory.c:5735

but task is already holding lock:
ffff8880296fb090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&sbi->lock){+.+.}-{3:3}:
       __mutex_lock_common kernel/locking/mutex.c:603 [inline]
       __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747
       reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27
       reiserfs_dirty_inode+0xd2/0x260 fs/reiserfs/super.c:704
       __mark_inode_dirty+0x1e0/0xd60 fs/fs-writeback.c:2424
       generic_update_time fs/inode.c:1859 [inline]
       inode_update_time fs/inode.c:1872 [inline]
       touch_atime+0x687/0x740 fs/inode.c:1944
       file_accessed include/linux/fs.h:2198 [inline]
       generic_file_mmap+0x119/0x150 mm/filemap.c:3600
       call_mmap include/linux/fs.h:1873 [inline]
       mmap_region+0x694/0x28d0 mm/mmap.c:2652
       do_mmap+0x816/0xf20 mm/mmap.c:1394
       vm_mmap_pgoff+0x1a4/0x3b0 mm/util.c:543
       ksys_mmap_pgoff+0x41f/0x5a0 mm/mmap.c:1440
       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 (&mm->mmap_lock){++++}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3108 [inline]
       check_prevs_add kernel/locking/lockdep.c:3227 [inline]
       validate_chain kernel/locking/lockdep.c:3842 [inline]
       __lock_acquire+0x2f21/0x5df0 kernel/locking/lockdep.c:5074
       lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5691
       __might_fault mm/memory.c:5736 [inline]
       __might_fault+0x115/0x190 mm/memory.c:5729
       reiserfs_ioctl+0x1d2/0x330 fs/reiserfs/ioctl.c:96
       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

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&sbi->lock);
                               lock(&mm->mmap_lock);
                               lock(&sbi->lock);
  rlock(&mm->mmap_lock);

 *** DEADLOCK ***

1 lock held by syz-executor.4/26405:
 #0: ffff8880296fb090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x79/0x100 fs/reiserfs/lock.c:27

stack backtrace:
CPU: 0 PID: 26405 Comm: syz-executor.4 Not tainted 6.3.0-next-20230426-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2188
 check_prev_add kernel/locking/lockdep.c:3108 [inline]
 check_prevs_add kernel/locking/lockdep.c:3227 [inline]
 validate_chain kernel/locking/lockdep.c:3842 [inline]
 __lock_acquire+0x2f21/0x5df0 kernel/locking/lockdep.c:5074
 lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5691
 __might_fault mm/memory.c:5736 [inline]
 __might_fault+0x115/0x190 mm/memory.c:5729
 reiserfs_ioctl+0x1d2/0x330 fs/reiserfs/ioctl.c:96
 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
RIP: 0033:0x7f26f928c169
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f26f9ff3168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f26f93abf80 RCX: 00007f26f928c169
RDX: 0000000000000000 RSI: 0000000080087601 RDI: 0000000000000005
RBP: 00007f26f92e7ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd93db377f R14: 00007f26f9ff3300 R15: 0000000000022000
 </TASK>