======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.45/6147 is trying to acquire lock:
ffff8881b9319578 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_init_acl+0x2f7/0x7a0

but task is already holding lock:
ffff8881b8fad4e8 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x36a/0x6d0

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x47/0x2e0
       ocfs2_start_trans+0x36a/0x6d0
       ocfs2_reserve_local_alloc_bits+0xaf4/0x24b0
       ocfs2_reserve_clusters_with_limit+0x1be/0xba0
       ocfs2_extend_dir+0x701/0x4850
       ocfs2_prepare_dir_for_insert+0x3032/0x4ea0
       ocfs2_mknod+0x80e/0x2030
       ocfs2_mkdir+0x181/0x420
       vfs_mkdir+0x512/0x5b0
       do_mkdirat+0x276/0x4b0
       __x64_sys_mkdirat+0x87/0xa0
       do_syscall_64+0xfa/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (sb_internal#3){.+.+}-{0:0}:
       ocfs2_start_trans+0x26b/0x6d0
       ocfs2_truncate_file+0x611/0x13e0
       ocfs2_setattr+0x1510/0x1b20
       notify_change+0xc1a/0xf40
       do_truncate+0x1a4/0x220
       path_openat+0x359d/0x3dd0
       do_filp_open+0x1fa/0x410
       do_sys_openat2+0x121/0x200
       __x64_sys_open+0x11e/0x150
       do_syscall_64+0xfa/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&oi->ip_alloc_sem){++++}-{4:4}:
       down_write+0x96/0x1f0
       ocfs2_try_remove_refcount_tree+0xb6/0x320
       ocfs2_truncate_file+0xd92/0x13e0
       ocfs2_setattr+0x1510/0x1b20
       notify_change+0xc1a/0xf40
       do_truncate+0x1a4/0x220
       path_openat+0x359d/0x3dd0
       do_filp_open+0x1fa/0x410
       do_sys_openat2+0x121/0x200
       __x64_sys_open+0x11e/0x150
       do_syscall_64+0xfa/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&oi->ip_xattr_sem){++++}-{4:4}:
       __lock_acquire+0x15a6/0x2cf0
       lock_acquire+0x117/0x340
       down_read+0x47/0x2e0
       ocfs2_init_acl+0x2f7/0x7a0
       ocfs2_mknod+0x12ff/0x2030
       ocfs2_create+0x195/0x420
       path_openat+0x18bb/0x3dd0
       do_filp_open+0x1fa/0x410
       do_sys_openat2+0x121/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0xfa/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &oi->ip_xattr_sem --> sb_internal#3 --> &journal->j_trans_barrier

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(&journal->j_trans_barrier);
                               lock(sb_internal#3);
                               lock(&journal->j_trans_barrier);
  rlock(&oi->ip_xattr_sem);

 *** DEADLOCK ***

8 locks held by syz.0.45/6147:
 #0: ffff88816b65c420 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881b9319840 (&type->i_mutex_dir_key#11){+.+.}-{4:4}, at: path_openat+0xb47/0x3dd0
 #2: ffff8881b93109c0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x164/0x4600
 #3: ffff8881b93160c0 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x164/0x4600
 #4: ffff8881b9315240 (&ocfs2_sysfile_lock_key[LOCAL_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_local_alloc_bits+0x125/0x24b0
 #5: ffff88816b65c610 (sb_internal#3){.+.+}-{0:0}, at: ocfs2_mknod+0xe71/0x2030
 #6: ffff8881b8fad4e8 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x36a/0x6d0
 #7: ffff888169a86950 (jbd2_handle#2){.+.+}-{0:0}, at: start_this_handle+0x1f87/0x21c0

stack backtrace:
CPU: 1 UID: 0 PID: 6147 Comm: syz.0.45 Not tainted syzkaller #0 PREEMPT(full) 
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+0x189/0x250
 print_circular_bug+0x2e2/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x15a6/0x2cf0
 lock_acquire+0x117/0x340
 down_read+0x47/0x2e0
 ocfs2_init_acl+0x2f7/0x7a0
 ocfs2_mknod+0x12ff/0x2030
 ocfs2_create+0x195/0x420
 path_openat+0x18bb/0x3dd0
 do_filp_open+0x1fa/0x410
 do_sys_openat2+0x121/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0xfa/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f656ff8f7c9
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:00007f6570e86038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f65701e5fa0 RCX: 00007f656ff8f7c9
RDX: 0000000000101142 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f656fff297f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000123 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f65701e6038 R14: 00007f65701e5fa0 R15: 00007ffc4234f408
 </TASK>
