REISERFS (device loop0): Using r5 hash to sort names
REISERFS (device loop0): using 3.5.x disk format
REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
======================================================
WARNING: possible circular locking dependency detected
6.12.0-rc3-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/6758 is trying to acquire lock:
ffff888021747090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x7b/0xe0 fs/reiserfs/lock.c:27

but task is already holding lock:
ffff888079688ad8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:122 [inline]
ffff888079688ad8 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x17c/0x3d0 mm/util.c:586

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&mm->mmap_lock){++++}-{3:3}:
       __might_fault+0xc6/0x120 mm/memory.c:6700
       reiserfs_ioctl+0x122/0x2f0 fs/reiserfs/ioctl.c:96
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:907 [inline]
       __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0x82/0x160 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x76/0x7e

-> #0 (&sbi->lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3161 [inline]
       check_prevs_add kernel/locking/lockdep.c:3280 [inline]
       validate_chain kernel/locking/lockdep.c:3904 [inline]
       __lock_acquire+0x2f62/0x8080 kernel/locking/lockdep.c:5202
       lock_acquire+0x1ed/0x540 kernel/locking/lockdep.c:5825
       __mutex_lock_common kernel/locking/mutex.c:608 [inline]
       __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
       reiserfs_write_lock+0x7b/0xe0 fs/reiserfs/lock.c:27
       reiserfs_dirty_inode+0xf2/0x240 fs/reiserfs/super.c:703
       __mark_inode_dirty+0x30f/0xeb0 fs/fs-writeback.c:2493
       generic_update_time fs/inode.c:2043 [inline]
       inode_update_time fs/inode.c:2056 [inline]
       touch_atime+0x358/0x5a0 fs/inode.c:2128
       file_accessed include/linux/fs.h:2528 [inline]
       generic_file_mmap+0xbd/0x120 mm/filemap.c:3743
       call_mmap include/linux/fs.h:2172 [inline]
       mmap_region+0x1be8/0x2c60 mm/mmap.c:1440
       do_mmap+0x8f0/0x1000 mm/mmap.c:496
       vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588
       ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:542
       do_syscall_x64 arch/x86/entry/common.c:52 [inline]
       do_syscall_64+0x82/0x160 arch/x86/entry/common.c:83
       entry_SYSCALL_64_after_hwframe+0x76/0x7e

other info that might help us debug this:

 Possible unsafe locking scenario:

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

 *** DEADLOCK ***

2 locks held by syz-executor.0/6758:
 #0: ffff888079688ad8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:122 [inline]
 #0: ffff888079688ad8 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x17c/0x3d0 mm/util.c:586
 #1: ffff8880793aa420 (sb_writers#13){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2528 [inline]
 #1: ffff8880793aa420 (sb_writers#13){.+.+}-{0:0}, at: generic_file_mmap+0xbd/0x120 mm/filemap.c:3743

stack backtrace:
CPU: 1 UID: 0 PID: 6758 Comm: syz-executor.0 Not tainted 6.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074
 check_noncircular+0x379/0x4b0 kernel/locking/lockdep.c:2206
 check_prev_add kernel/locking/lockdep.c:3161 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain kernel/locking/lockdep.c:3904 [inline]
 __lock_acquire+0x2f62/0x8080 kernel/locking/lockdep.c:5202
 lock_acquire+0x1ed/0x540 kernel/locking/lockdep.c:5825
 __mutex_lock_common kernel/locking/mutex.c:608 [inline]
 __mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
 reiserfs_write_lock+0x7b/0xe0 fs/reiserfs/lock.c:27
 reiserfs_dirty_inode+0xf2/0x240 fs/reiserfs/super.c:703
 __mark_inode_dirty+0x30f/0xeb0 fs/fs-writeback.c:2493
 generic_update_time fs/inode.c:2043 [inline]
 inode_update_time fs/inode.c:2056 [inline]
 touch_atime+0x358/0x5a0 fs/inode.c:2128
 file_accessed include/linux/fs.h:2528 [inline]
 generic_file_mmap+0xbd/0x120 mm/filemap.c:3743
 call_mmap include/linux/fs.h:2172 [inline]
 mmap_region+0x1be8/0x2c60 mm/mmap.c:1440
 do_mmap+0x8f0/0x1000 mm/mmap.c:496
 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588
 ksys_mmap_pgoff+0x4eb/0x720 mm/mmap.c:542
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x82/0x160 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f10a3e7cb29
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f10a4c9e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f10a3f9bf80 RCX: 00007f10a3e7cb29
RDX: 0000000000800001 RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f10a3ec847a R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f10a3f9bf80 R15: 00007ffdd8863558
 </TASK>