ocfs2: Mounting device (7,1) on (node local, slot 0) with ordered data mode.
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.1.9049/8221 is trying to acquire lock:
ffff8881aaff8660 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x340

but task is already holding lock:
ffff8881aaff86f8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x340

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&oi->ip_xattr_sem){++++}-{4:4}:
       down_read+0x47/0x2e0
       ocfs2_init_acl+0x2fd/0x7e0
       ocfs2_mknod+0x1423/0x2210
       ocfs2_create+0x195/0x440
       path_openat+0x18dd/0x3e20
       do_filp_open+0x22d/0x490
       do_sys_openat2+0x12f/0x220
       __x64_sys_creat+0x8f/0xc0
       do_syscall_64+0xe2/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x47/0x2e0
       ocfs2_start_trans+0x3ab/0x700
       ocfs2_reserve_local_alloc_bits+0xb49/0x2610
       ocfs2_reserve_clusters_with_limit+0x1b9/0xc20
       ocfs2_mknod+0xecf/0x2210
       ocfs2_mkdir+0x181/0x430
       vfs_mkdir+0x511/0x5b0
       do_mkdirat+0x27d/0x4b0
       __x64_sys_mkdirat+0x87/0xa0
       do_syscall_64+0xe2/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#4){.+.+}-{0:0}:
       ocfs2_start_trans+0x2ac/0x700
       ocfs2_write_begin_nolock+0x278b/0x4140
       ocfs2_write_begin+0x1c5/0x320
       generic_perform_write+0x2e2/0x8f0
       __generic_file_write_iter+0x1ae/0x230
       ocfs2_file_write_iter+0x1663/0x1e20
       aio_write+0x5cd/0x870
       io_submit_one+0x7bb/0x14c0
       __se_sys_io_submit+0x195/0x340
       do_syscall_64+0xe2/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}:
       __lock_acquire+0x15a5/0x2cf0
       lock_acquire+0x106/0x330
       down_write+0x96/0x200
       ocfs2_try_remove_refcount_tree+0xb6/0x340
       ocfs2_xattr_set+0x61a/0x13e0
       ocfs2_set_acl+0x701/0x7b0
       ocfs2_iop_set_acl+0x1b1/0x2b0
       vfs_set_acl+0x87d/0xb00
       filename_setxattr+0x2fc/0x630
       path_setxattrat+0x3f3/0x430
       __x64_sys_setxattr+0xbc/0xe0
       do_syscall_64+0xe2/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &ocfs2_file_ip_alloc_sem_key --> &journal->j_trans_barrier --> &oi->ip_xattr_sem

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&oi->ip_xattr_sem);
                               lock(&journal->j_trans_barrier);
                               lock(&oi->ip_xattr_sem);
  lock(&ocfs2_file_ip_alloc_sem_key);

 *** DEADLOCK ***

3 locks held by syz.1.9049/8221:
 #0: ffff888190c06420 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881aaff89c0 (&type->i_mutex_dir_key#17){++++}-{4:4}, at: vfs_set_acl+0x3cd/0xb00
 #2: ffff8881aaff86f8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x340

stack backtrace:
CPU: 0 UID: 0 PID: 8221 Comm: syz.1.9049 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+0x106/0x330
 down_write+0x96/0x200
 ocfs2_try_remove_refcount_tree+0xb6/0x340
 ocfs2_xattr_set+0x61a/0x13e0
 ocfs2_set_acl+0x701/0x7b0
 ocfs2_iop_set_acl+0x1b1/0x2b0
 vfs_set_acl+0x87d/0xb00
 filename_setxattr+0x2fc/0x630
 path_setxattrat+0x3f3/0x430
 __x64_sys_setxattr+0xbc/0xe0
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7d7999acb9
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:00007f7d7a885028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f7d79c15fa0 RCX: 00007f7d7999acb9
RDX: 0000000000000000 RSI: 0000200000002a40 RDI: 0000200000002a00
RBP: 00007f7d79a08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7d79c16038 R14: 00007f7d79c15fa0 R15: 00007ffe4537c4f8
 </TASK>
