syzbot

loop1: detected capacity change from 0 to 32768
JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,1) on (node local, slot 0) with ordered data mode.
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.1.2505/14918 is trying to acquire lock:
ffff88805e155118 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
ffff88805e155118 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{3:3}, at: ocfs2_move_extent fs/ocfs2/move_extents.c:646 [inline]
ffff88805e155118 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{3:3}, at: __ocfs2_move_extents_range+0x1a63/0x35d0 fs/ocfs2/move_extents.c:866

but task is already holding lock:
ffff8880552eb498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
ffff8880552eb498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: ocfs2_move_extent fs/ocfs2/move_extents.c:638 [inline]
ffff8880552eb498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: __ocfs2_move_extents_range+0x1381/0x35d0 fs/ocfs2/move_extents.c:866

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}:
       down_write+0x97/0x200 kernel/locking/rwsem.c:1573
       inode_lock include/linux/fs.h:804 [inline]
       ocfs2_reserve_suballoc_bits+0x16e/0x44c0 fs/ocfs2/suballoc.c:782
       ocfs2_reserve_cluster_bitmap_bits+0xc5/0x1d0 fs/ocfs2/suballoc.c:1128
       ocfs2_local_alloc_reserve_for_window fs/ocfs2/localalloc.c:1112 [inline]
       ocfs2_local_alloc_slide_window fs/ocfs2/localalloc.c:1248 [inline]
       ocfs2_reserve_local_alloc_bits+0x8bf/0x2600 fs/ocfs2/localalloc.c:668
       ocfs2_reserve_clusters_with_limit+0x1ba/0xc20 fs/ocfs2/suballoc.c:1162
       ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1223 [inline]
       ocfs2_lock_allocators+0x2d9/0x5f0 fs/ocfs2/suballoc.c:2679
       ocfs2_write_begin_nolock+0x1b2b/0x43f0 fs/ocfs2/aops.c:1740
       ocfs2_write_begin+0x1c6/0x320 fs/ocfs2/aops.c:1904
       generic_perform_write+0x2fe/0x5c0 mm/filemap.c:4031
       ocfs2_file_write_iter+0x167a/0x1e80 fs/ocfs2/file.c:2468
       call_write_iter include/linux/fs.h:2018 [inline]
       new_sync_write fs/read_write.c:491 [inline]
       vfs_write+0x46c/0x990 fs/read_write.c:584
       ksys_write+0x150/0x260 fs/read_write.c:637
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #1 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}:
       down_write+0x97/0x200 kernel/locking/rwsem.c:1573
       inode_lock include/linux/fs.h:804 [inline]
       ocfs2_reserve_local_alloc_bits+0x120/0x2600 fs/ocfs2/localalloc.c:635
       ocfs2_reserve_clusters_with_limit+0x1ba/0xc20 fs/ocfs2/suballoc.c:1162
       ocfs2_defrag_extent fs/ocfs2/move_extents.c:272 [inline]
       __ocfs2_move_extents_range+0x1642/0x35d0 fs/ocfs2/move_extents.c:863
       ocfs2_move_extents+0x3a7/0x9a0 fs/ocfs2/move_extents.c:938
       ocfs2_ioctl_move_extents+0x527/0x6c0 fs/ocfs2/move_extents.c:1064
       ocfs2_ioctl+0x199/0x7e0 fs/ocfs2/ioctl.c:945
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:871 [inline]
       __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

-> #0 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2){+.+.}-{3:3}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain kernel/locking/lockdep.c:3869 [inline]
       __lock_acquire+0x2df1/0x7d40 kernel/locking/lockdep.c:5137
       lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
       down_write+0x97/0x200 kernel/locking/rwsem.c:1573
       inode_lock include/linux/fs.h:804 [inline]
       ocfs2_move_extent fs/ocfs2/move_extents.c:646 [inline]
       __ocfs2_move_extents_range+0x1a63/0x35d0 fs/ocfs2/move_extents.c:866
       ocfs2_move_extents+0x3a7/0x9a0 fs/ocfs2/move_extents.c:938
       ocfs2_ioctl_move_extents+0x527/0x6c0 fs/ocfs2/move_extents.c:1064
       ocfs2_ioctl+0x199/0x7e0 fs/ocfs2/ioctl.c:945
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:871 [inline]
       __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
       do_syscall_x64 arch/x86/entry/common.c:46 [inline]
       do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
       entry_SYSCALL_64_after_hwframe+0x68/0xd2

other info that might help us debug this:

Chain exists of:
  &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2 --> &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6 --> &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3

 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]#6);
                               lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3);
  lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#2);

 *** DEADLOCK ***

6 locks held by syz.1.2505/14918:
 #0: ffff88805ddb6418 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write_file+0x63/0x200 fs/namespace.c:456
 #1: ffff88805e1542d8 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
 #1: ffff88805e1542d8 (&sb->s_type->i_mutex_key#20){+.+.}-{3:3}, at: ocfs2_move_extents+0x1a0/0x9a0 fs/ocfs2/move_extents.c:916
 #2: ffff88805e153f60 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_move_extents+0x39a/0x9a0 fs/ocfs2/move_extents.c:936
 #3: ffff888066601098 (&new->rf_sem){+.+.}-{3:3}, at: __ocfs2_lock_refcount_tree fs/ocfs2/refcounttree.c:428 [inline]
 #3: ffff888066601098 (&new->rf_sem){+.+.}-{3:3}, at: ocfs2_lock_refcount_tree+0x1b8/0xa40 fs/ocfs2/refcounttree.c:463
 #4: ffff8880550c5118 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
 #4: ffff8880550c5118 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}, at: ocfs2_reserve_suballoc_bits+0x16e/0x44c0 fs/ocfs2/suballoc.c:782
 #5: ffff8880552eb498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline]
 #5: ffff8880552eb498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: ocfs2_move_extent fs/ocfs2/move_extents.c:638 [inline]
 #5: ffff8880552eb498 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#3){+.+.}-{3:3}, at: __ocfs2_move_extents_range+0x1381/0x35d0 fs/ocfs2/move_extents.c:866

stack backtrace:
CPU: 0 PID: 14918 Comm: syz.1.2505 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 check_noncircular+0x2fc/0x400 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain kernel/locking/lockdep.c:3869 [inline]
 __lock_acquire+0x2df1/0x7d40 kernel/locking/lockdep.c:5137
 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754
 down_write+0x97/0x200 kernel/locking/rwsem.c:1573
 inode_lock include/linux/fs.h:804 [inline]
 ocfs2_move_extent fs/ocfs2/move_extents.c:646 [inline]
 __ocfs2_move_extents_range+0x1a63/0x35d0 fs/ocfs2/move_extents.c:866
 ocfs2_move_extents+0x3a7/0x9a0 fs/ocfs2/move_extents.c:938
 ocfs2_ioctl_move_extents+0x527/0x6c0 fs/ocfs2/move_extents.c:1064
 ocfs2_ioctl+0x199/0x7e0 fs/ocfs2/ioctl.c:945
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6124f9bf79
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6125e8a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f6125215fa0 RCX: 00007f6124f9bf79
RDX: 00002000000000c0 RSI: 0000000040406f06 RDI: 0000000000000005
RBP: 00007f61250327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6125216038 R14: 00007f6125215fa0 R15: 00007ffdfd462d48
 </TASK>