======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.7.264/7988 is trying to acquire lock:
ffff88801dee7658 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x360

but task is already holding lock:
ffff88801dee76e8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x360

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+0x4a/0x330
       ocfs2_init_acl+0x2fd/0x7e0
       ocfs2_mknod+0x166a/0x2240
       vfs_mknod+0x441/0x600
       filename_mknodat+0x3cb/0x660
       __se_sys_mknodat+0x3b/0x150
       do_syscall_64+0x174/0x580
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x4a/0x330
       ocfs2_start_trans+0x3ab/0x700
       ocfs2_setattr+0x9eb/0x1d10
       notify_change+0xbba/0xea0
       chown_common+0x41c/0x630
       do_fchownat+0x14c/0x250
       __x64_sys_chown+0x82/0xa0
       do_syscall_64+0x174/0x580
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#4){.+.+}-{0:0}:
       ocfs2_start_trans+0x2ac/0x700
       ocfs2_truncate_file+0x634/0x14b0
       ocfs2_setattr+0x1641/0x1d10
       notify_change+0xbba/0xea0
       do_truncate+0x1c2/0x250
       path_openat+0x2fed/0x3830
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x115/0x200
       __x64_sys_open+0x11e/0x150
       do_syscall_64+0x174/0x580
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&oi->ip_alloc_sem){++++}-{4:4}:
       __lock_acquire+0x1520/0x2cf0
       lock_acquire+0x106/0x350
       down_write+0x96/0x200
       ocfs2_try_remove_refcount_tree+0xb6/0x360
       ocfs2_truncate_file+0xe90/0x14b0
       ocfs2_setattr+0x1641/0x1d10
       notify_change+0xbba/0xea0
       do_truncate+0x1c2/0x250
       path_openat+0x2fed/0x3830
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x115/0x200
       __x64_sys_open+0x11e/0x150
       do_syscall_64+0x174/0x580
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &oi->ip_alloc_sem --> &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(&oi->ip_alloc_sem);

 *** DEADLOCK ***

3 locks held by syz.7.264/7988:
 #0: ffff8881bc596450 (sb_writers#19){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff88801dee79a0 (&sb->s_type->i_mutex_key#40){+.+.}-{4:4}, at: do_truncate+0x18f/0x250
 #2: ffff88801dee76e8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x360

stack backtrace:
CPU: 0 UID: 0 PID: 7988 Comm: syz.7.264 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+0xe8/0x150
 print_circular_bug+0x2e1/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x1520/0x2cf0
 lock_acquire+0x106/0x350
 down_write+0x96/0x200
 ocfs2_try_remove_refcount_tree+0xb6/0x360
 ocfs2_truncate_file+0xe90/0x14b0
 ocfs2_setattr+0x1641/0x1d10
 notify_change+0xbba/0xea0
 do_truncate+0x1c2/0x250
 path_openat+0x2fed/0x3830
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x115/0x200
 __x64_sys_open+0x11e/0x150
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a3419ce59
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:00007f5a34fec028 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f5a34416180 RCX: 00007f5a3419ce59
RDX: 0000000000000020 RSI: 000000000014927e RDI: 00002000000001c0
RBP: 00007f5a34232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5a34416218 R14: 00007f5a34416180 R15: 00007ffcd2bdd968
 </TASK>
