======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz-executor/5834 is trying to acquire lock:
ffff8881afd009a0 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}, at: _ocfs2_free_suballoc_bits+0x1466/0x2780

but task is already holding lock:
ffff88816a26b0e0 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x3ab/0x700

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x47/0x2e0
       ocfs2_start_trans+0x3ab/0x700
       ocfs2_reserve_suballoc_bits+0x7b4/0x4840
       ocfs2_reserve_new_metadata_blocks+0x415/0x9a0
       ocfs2_extend_dir+0xcc8/0x4a30
       ocfs2_prepare_dir_for_insert+0x347a/0x52f0
       ocfs2_mknod+0xa1b/0x2260
       ocfs2_mkdir+0x181/0x460
       vfs_mkdir+0x413/0x630
       filename_mkdirat+0x285/0x510
       __se_sys_mkdirat+0x35/0x150
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#5){.+.+}-{0:0}:
       ocfs2_start_trans+0x2ac/0x700
       ocfs2_reserve_suballoc_bits+0x7b4/0x4840
       ocfs2_reserve_new_metadata_blocks+0x415/0x9a0
       ocfs2_extend_dir+0xcc8/0x4a30
       ocfs2_prepare_dir_for_insert+0x347a/0x52f0
       ocfs2_mknod+0xa1b/0x2260
       ocfs2_mkdir+0x181/0x460
       vfs_mkdir+0x413/0x630
       filename_mkdirat+0x285/0x510
       __se_sys_mkdirat+0x35/0x150
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}:
       __lock_acquire+0x15a5/0x2cf0
       lock_acquire+0x106/0x350
       down_write+0x96/0x200
       _ocfs2_free_suballoc_bits+0x1466/0x2780
       ocfs2_free_dinode+0xb1/0xe0
       ocfs2_evict_inode+0x1eb9/0x43b0
       evict+0x61e/0xb10
       vfs_rmdir+0x42a/0x6e0
       filename_rmdir+0x292/0x520
       __se_sys_unlinkat+0x71/0x1a0
       do_syscall_64+0x15f/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE] --> sb_internal#5 --> &journal->j_trans_barrier

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(&journal->j_trans_barrier);
                               lock(sb_internal#5);
                               lock(&journal->j_trans_barrier);
  lock(&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]);

 *** DEADLOCK ***

8 locks held by syz-executor/5834:
 #0: ffff8881b4688410 (sb_writers#30){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881afc2eba0 (&type->i_mutex_dir_key#20/1){+.+.}-{4:4}, at: filename_rmdir+0x1cd/0x520
 #2: ffff8881bacd4bc0 (&osb->nfs_sync_rwlock){.+.+}-{4:4}, at: ocfs2_nfs_sync_lock+0x106/0x270
 #3: ffff8881afd025a0 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_evict_inode+0xe97/0x43b0
 #4: ffff8881afc06ba0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_evict_inode+0x1539/0x43b0
 #5: ffff8881b4688600 (sb_internal#5){.+.+}-{0:0}, at: ocfs2_evict_inode+0x161f/0x43b0
 #6: ffff88816a26b0e0 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x3ab/0x700
 #7: ffff8881b468c938 (jbd2_handle#2){.+.+}-{0:0}, at: start_this_handle+0x2054/0x2290

stack backtrace:
CPU: 0 UID: 0 PID: 5834 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 print_circular_bug+0x2e1/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x15a5/0x2cf0
 lock_acquire+0x106/0x350
 down_write+0x96/0x200
 _ocfs2_free_suballoc_bits+0x1466/0x2780
 ocfs2_free_dinode+0xb1/0xe0
 ocfs2_evict_inode+0x1eb9/0x43b0
 evict+0x61e/0xb10
 vfs_rmdir+0x42a/0x6e0
 filename_rmdir+0x292/0x520
 __se_sys_unlinkat+0x71/0x1a0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2778f9b937
Code: 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 b8 07 01 00 00 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:00007ffd3832ee08 EFLAGS: 00000207 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00007f2778f9b937
RDX: 0000000000000200 RSI: 00007ffd3832ffb0 RDI: 00000000ffffff9c
RBP: 00007f2779032048 R08: 0000000000008560 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000207 R12: 00007ffd3832ffb0
R13: 00007f2779032048 R14: 0000000000024dc7 R15: 00007ffd38332170
 </TASK>
