======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.8.1191/16620 is trying to acquire lock:
ffff8881abf40660 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x340

but task is already holding lock:
ffff8881abf406f8 (&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+0x1679/0x2290
       ocfs2_mkdir+0x181/0x490
       vfs_mkdir+0x413/0x630
       filename_mkdirat+0x285/0x510
       __se_sys_mkdirat+0x35/0x150
       do_syscall_64+0x14d/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_mknod+0x1181/0x2290
       ocfs2_create+0x195/0x490
       path_openat+0x1395/0x3860
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#5){.+.+}-{0:0}:
       ocfs2_start_trans+0x2ac/0x700
       ocfs2_setattr+0xcc6/0x1cc0
       notify_change+0xc1a/0xf40
       do_truncate+0x1c2/0x250
       do_ftruncate+0x4db/0x5c0
       __x64_sys_ftruncate+0x92/0xf0
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&oi->ip_alloc_sem){++++}-{4:4}:
       __lock_acquire+0x15a5/0x2cf0
       lock_acquire+0xf0/0x2e0
       down_write+0x96/0x200
       ocfs2_try_remove_refcount_tree+0xb6/0x340
       ocfs2_truncate_file+0xdf3/0x1540
       ocfs2_setattr+0x15e5/0x1cc0
       notify_change+0xc1a/0xf40
       do_truncate+0x1c2/0x250
       path_openat+0x2f89/0x3860
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x14d/0xf80
       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.8.1191/16620:
 #0: ffff88811612e420 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881abf409c0 (&sb->s_type->i_mutex_key#28){++++}-{4:4}, at: do_truncate+0x18f/0x250
 #2: ffff8881abf406f8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x340

stack backtrace:
CPU: 1 UID: 0 PID: 16620 Comm: syz.8.1191 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+0xf0/0x2e0
 down_write+0x96/0x200
 ocfs2_try_remove_refcount_tree+0xb6/0x340
 ocfs2_truncate_file+0xdf3/0x1540
 ocfs2_setattr+0x15e5/0x1cc0
 notify_change+0xc1a/0xf40
 do_truncate+0x1c2/0x250
 path_openat+0x2f89/0x3860
 do_file_open+0x23e/0x4a0
 do_sys_openat2+0x113/0x200
 __x64_sys_openat+0x138/0x170
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7e0539c799
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:00007f7e062a0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f7e05615fa0 RCX: 00007f7e0539c799
RDX: 0000000000183341 RSI: 0000200000000080 RDI: ffffffffffffff9c
RBP: 00007f7e05432bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000045 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7e05616038 R14: 00007f7e05615fa0 R15: 00007ffc3236ed38
 </TASK>
