======================================================
WARNING: possible circular locking dependency detected
6.3.0-rc1-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.0/2641 is trying to acquire lock:
ffff88807d997090 (&sbi->lock){+.+.}-{3:3}, at: reiserfs_write_lock+0x70/0xc0 fs/reiserfs/lock.c:27

but task is already holding lock:
ffff8880116f1398 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
ffff8880116f1398 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x180/0x290 mm/util.c:540

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&mm->mmap_lock){++++}-{3:3}:
       lock_acquire+0x23e/0x630 kernel/locking/lockdep.c:5669
       __might_fault+0xa6/0x100 mm/memory.c:5625
       reiserfs_ioctl+0xec/0x2c0 fs/reiserfs/ioctl.c:96
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:870 [inline]
       __se_sys_ioctl+0xa7/0xf0 fs/ioctl.c:856
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x41/0x90 arch/x86/entry/common.c:80
       entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> #0 (&sbi->lock){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3098 [inline]
       check_prevs_add kernel/locking/lockdep.c:3217 [inline]
       validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3832
       __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056
       lock_acquire+0x23e/0x630 kernel/locking/lockdep.c:5669
       __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603
       __mutex_lock kernel/locking/mutex.c:747 [inline]
       mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
       reiserfs_write_lock+0x70/0xc0 fs/reiserfs/lock.c:27
       reiserfs_dirty_inode+0xdc/0x1f0 fs/reiserfs/super.c:704
       __mark_inode_dirty+0x279/0xc70 fs/fs-writeback.c:2421
       generic_update_time fs/inode.c:1860 [inline]
       inode_update_time fs/inode.c:1873 [inline]
       touch_atime+0x328/0x500 fs/inode.c:1945
       file_accessed include/linux/fs.h:2181 [inline]
       generic_file_mmap+0xa2/0xf0 mm/filemap.c:3603
       call_mmap include/linux/fs.h:1856 [inline]
       mmap_region+0x9de/0x1940 mm/mmap.c:2574
       do_mmap+0x6b2/0xb80 mm/mmap.c:1364
       vm_mmap_pgoff+0x1bb/0x290 mm/util.c:542
       ksys_mmap_pgoff+0x42c/0x5d0 mm/mmap.c:1410
       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
       do_syscall_64+0x41/0x90 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(&mm->mmap_lock);
                               lock(&sbi->lock);
                               lock(&mm->mmap_lock);
  lock(&sbi->lock);

 *** DEADLOCK ***

2 locks held by syz-executor.0/2641:
 #0: ffff8880116f1398 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
 #0: ffff8880116f1398 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x180/0x290 mm/util.c:540
 #1: ffff88807c548448 (sb_writers#14){.+.+}-{0:0}, at: file_accessed include/linux/fs.h:2181 [inline]
 #1: ffff88807c548448 (sb_writers#14){.+.+}-{0:0}, at: generic_file_mmap+0xa2/0xf0 mm/filemap.c:3603

stack backtrace:
CPU: 1 PID: 2641 Comm: syz-executor.0 Not tainted 6.3.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x167/0x220 lib/dump_stack.c:106
 check_noncircular+0x2fe/0x3b0 kernel/locking/lockdep.c:2178
 check_prev_add kernel/locking/lockdep.c:3098 [inline]
 check_prevs_add kernel/locking/lockdep.c:3217 [inline]
 validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3832
 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056
 lock_acquire+0x23e/0x630 kernel/locking/lockdep.c:5669
 __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603
 __mutex_lock kernel/locking/mutex.c:747 [inline]
 mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799
 reiserfs_write_lock+0x70/0xc0 fs/reiserfs/lock.c:27
 reiserfs_dirty_inode+0xdc/0x1f0 fs/reiserfs/super.c:704
 __mark_inode_dirty+0x279/0xc70 fs/fs-writeback.c:2421
 generic_update_time fs/inode.c:1860 [inline]
 inode_update_time fs/inode.c:1873 [inline]
 touch_atime+0x328/0x500 fs/inode.c:1945
 file_accessed include/linux/fs.h:2181 [inline]
 generic_file_mmap+0xa2/0xf0 mm/filemap.c:3603
 call_mmap include/linux/fs.h:1856 [inline]
 mmap_region+0x9de/0x1940 mm/mmap.c:2574
 do_mmap+0x6b2/0xb80 mm/mmap.c:1364
 vm_mmap_pgoff+0x1bb/0x290 mm/util.c:542
 ksys_mmap_pgoff+0x42c/0x5d0 mm/mmap.c:1410
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f52bfe7cae9
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:00007f52c0c770c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007f52bff9c050 RCX: 00007f52bfe7cae9
RDX: 0000000000000002 RSI: 0000000000b36000 RDI: 0000000020000000
RBP: 00007f52bfec847a R08: 0000000000000004 R09: 0000000000000000
R10: 0000000000028011 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f52bff9c050 R15: 00007ffcec4bac38
 </TASK>