======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.5.4704/24550 is trying to acquire lock:
ffff8880120f0660 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x340

but task is already holding lock:
ffff8880120f06f8 (&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_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

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x47/0x2e0
       ocfs2_start_trans+0x3ab/0x700
       ocfs2_modify_bh+0xe3/0x4d0
       ocfs2_local_read_info+0x1454/0x1810
       dquot_load_quota_sb+0x791/0xbd0
       dquot_load_quota_inode+0x2e1/0x5d0
       ocfs2_enable_quotas+0x1c8/0x4a0
       ocfs2_fill_super+0x5337/0x6910
       get_tree_bdev_flags+0x431/0x4f0
       vfs_get_tree+0x92/0x2a0
       do_new_mount+0x329/0xa50
       __se_sys_mount+0x31d/0x420
       do_syscall_64+0xe2/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#5){.+.+}-{0:0}:
       ocfs2_start_trans+0x2ac/0x700
       ocfs2_acquire_dquot+0x445/0xb20
       dqget+0x7b1/0xf10
       __dquot_initialize+0x3ba/0xd30
       ocfs2_get_init_inode+0x147/0x1c0
       ocfs2_mknod+0x86f/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

-> #0 (&ocfs2_quota_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_truncate_file+0xdf3/0x1480
       ocfs2_setattr+0x15e5/0x1c70
       notify_change+0xc1a/0xf40
       do_truncate+0x1c2/0x250
       path_openat+0x360c/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

other info that might help us debug this:

Chain exists of:
  &ocfs2_quota_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_quota_ip_alloc_sem_key);

 *** DEADLOCK ***

3 locks held by syz.5.4704/24550:
 #0: ffff8881b5624420 (sb_writers#17){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8880120f09c0 (&sb->s_type->i_mutex_key#29){+.+.}-{4:4}, at: do_truncate+0x18f/0x250
 #2: ffff8880120f06f8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x340

stack backtrace:
CPU: 0 UID: 0 PID: 24550 Comm: syz.5.4704 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_truncate_file+0xdf3/0x1480
 ocfs2_setattr+0x15e5/0x1c70
 notify_change+0xc1a/0xf40
 do_truncate+0x1c2/0x250
 path_openat+0x360c/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
RIP: 0033:0x7f08caf9acb9
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:00007f08cbec5028 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f08cb215fa0 RCX: 00007f08caf9acb9
RDX: 0000000000000000 RSI: 000000000000014c RDI: 0000200000000000
RBP: 00007f08cb008bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f08cb216038 R14: 00007f08cb215fa0 R15: 00007ffe0f3fbff8
 </TASK>
