syzbot

ocfs2: Mounting device (7,1) on (node local, slot 0) with ordered data mode.
======================================================
WARNING: possible circular locking dependency detected
6.15.0-syzkaller-13743-g8630c59e9936 #0 Not tainted
------------------------------------------------------
syz.1.4266/21938 is trying to acquire lock:
ffff888052a65100 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
ffff888052a65100 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{4:4}, at: ocfs2_move_extent fs/ocfs2/move_extents.c:640 [inline]
ffff888052a65100 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{4:4}, at: __ocfs2_move_extents_range+0x1a68/0x3370 fs/ocfs2/move_extents.c:860

but task is already holding lock:
ffff888077156d80 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
ffff888077156d80 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{4:4}, at: ocfs2_move_extent fs/ocfs2/move_extents.c:632 [inline]
ffff888077156d80 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{4:4}, at: __ocfs2_move_extents_range+0x1374/0x3370 fs/ocfs2/move_extents.c:860

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #1 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{4:4}:
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
       down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577
       inode_lock include/linux/fs.h:867 [inline]
       __ocfs2_flush_truncate_log+0x33c/0x10e0 fs/ocfs2/alloc.c:6054
       ocfs2_flush_truncate_log fs/ocfs2/alloc.c:6084 [inline]
       ocfs2_try_to_free_truncate_log+0x19f/0x360 fs/ocfs2/alloc.c:6143
       ocfs2_write_begin_nolock+0x3143/0x4340 fs/ocfs2/aops.c:1848
       ocfs2_write_begin+0x1bb/0x310 fs/ocfs2/aops.c:1882
       generic_perform_write+0x2c7/0x910 mm/filemap.c:4112
       ocfs2_file_write_iter+0x157a/0x1d10 fs/ocfs2/file.c:2469
       new_sync_write fs/read_write.c:593 [inline]
       vfs_write+0x54b/0xa90 fs/read_write.c:686
       ksys_pwrite64 fs/read_write.c:793 [inline]
       __do_sys_pwrite64 fs/read_write.c:801 [inline]
       __se_sys_pwrite64 fs/read_write.c:798 [inline]
       __x64_sys_pwrite64+0x193/0x220 fs/read_write.c:798
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3168 [inline]
       check_prevs_add kernel/locking/lockdep.c:3287 [inline]
       validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911
       __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240
       lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
       down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577
       inode_lock include/linux/fs.h:867 [inline]
       ocfs2_move_extent fs/ocfs2/move_extents.c:640 [inline]
       __ocfs2_move_extents_range+0x1a68/0x3370 fs/ocfs2/move_extents.c:860
       ocfs2_move_extents+0x378/0x960 fs/ocfs2/move_extents.c:927
       ocfs2_ioctl_move_extents+0x53e/0x710 fs/ocfs2/move_extents.c:1053
       ocfs2_ioctl+0x191/0x750 fs/ocfs2/ioctl.c:946
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:907 [inline]
       __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3);
                               lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2);
                               lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3);
  lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2);

 *** DEADLOCK ***

5 locks held by syz.1.4266/21938:
 #0: ffff888031714428 (sb_writers#30){.+.+}-{0:0}, at: mnt_want_write_file+0x60/0x200 fs/namespace.c:601
 #1: ffff888052a65f40 (&sb->s_type->i_mutex_key#34){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
 #1: ffff888052a65f40 (&sb->s_type->i_mutex_key#34){+.+.}-{4:4}, at: ocfs2_move_extents+0x1a2/0x960 fs/ocfs2/move_extents.c:905
 #2: ffff888052a65be0 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_move_extents+0x36b/0x960 fs/ocfs2/move_extents.c:925
 #3: ffff888052a61800 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
 #3: ffff888052a61800 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x15e/0x4640 fs/ocfs2/suballoc.c:788
 #4: ffff888077156d80 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
 #4: ffff888077156d80 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{4:4}, at: ocfs2_move_extent fs/ocfs2/move_extents.c:632 [inline]
 #4: ffff888077156d80 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{4:4}, at: __ocfs2_move_extents_range+0x1374/0x3370 fs/ocfs2/move_extents.c:860

stack backtrace:
CPU: 1 UID: 0 PID: 21938 Comm: syz.1.4266 Not tainted 6.15.0-syzkaller-13743-g8630c59e9936 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2046
 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2178
 check_prev_add kernel/locking/lockdep.c:3168 [inline]
 check_prevs_add kernel/locking/lockdep.c:3287 [inline]
 validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911
 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240
 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871
 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577
 inode_lock include/linux/fs.h:867 [inline]
 ocfs2_move_extent fs/ocfs2/move_extents.c:640 [inline]
 __ocfs2_move_extents_range+0x1a68/0x3370 fs/ocfs2/move_extents.c:860
 ocfs2_move_extents+0x378/0x960 fs/ocfs2/move_extents.c:927
 ocfs2_ioctl_move_extents+0x53e/0x710 fs/ocfs2/move_extents.c:1053
 ocfs2_ioctl+0x191/0x750 fs/ocfs2/ioctl.c:946
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fad7038e929
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:00007fad7116b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fad705b5fa0 RCX: 00007fad7038e929
RDX: 00002000000000c0 RSI: 0000000040406f06 RDI: 0000000000000004
RBP: 00007fad70410b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fad705b5fa0 R15: 00007ffd7f423478
 </TASK>