======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.4.1703/14343 is trying to acquire lock:
ffff8881aa8cda58 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x360

but task is already holding lock:
ffff8881aa8cdae8 (&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
       ocfs2_mkdir+0x181/0x460
       vfs_mkdir+0x406/0x620
       filename_mkdirat+0x285/0x510
       __se_sys_mkdirat+0x35/0x150
       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_modify_bh+0xe3/0x4d0
       ocfs2_local_read_info+0x146b/0x1830
       dquot_load_quota_sb+0x76f/0xb70
       dquot_load_quota_inode+0x2dc/0x5d0
       ocfs2_enable_quotas+0x1c3/0x4a0
       ocfs2_fill_super+0x530c/0x6840
       get_tree_bdev_flags+0x430/0x4f0
       vfs_get_tree+0x92/0x2a0
       do_new_mount+0x319/0xdc0
       __se_sys_mount+0x31d/0x420
       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
       vfs_coredump+0x3775/0x44b0
       get_signal+0x1094/0x12c0
       arch_do_signal_or_restart+0xbb/0x860
       irqentry_exit+0x2ba/0x8f0
       exc_general_protection+0x16b/0x1f0
       asm_exc_general_protection+0x26/0x30

-> #0 (&ocfs2_file_ip_alloc_sem_key){++++}-{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
       vfs_coredump+0x3775/0x44b0
       get_signal+0x1094/0x12c0
       arch_do_signal_or_restart+0xbb/0x860
       irqentry_exit+0x2ba/0x8f0
       exc_general_protection+0x16b/0x1f0
       asm_exc_general_protection+0x26/0x30

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 ***

2 locks held by syz.4.1703/14343:
 #0: ffff8881aa8cdda0 (&sb->s_type->i_mutex_key#31){+.+.}-{4:4}, at: do_truncate+0x18f/0x250
 #1: ffff8881aa8cdae8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x360

stack backtrace:
CPU: 1 UID: 0 PID: 14343 Comm: syz.4.1703 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+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
 vfs_coredump+0x3775/0x44b0
 get_signal+0x1094/0x12c0
 arch_do_signal_or_restart+0xbb/0x860
 irqentry_exit+0x2ba/0x8f0
 exc_general_protection+0x16b/0x1f0
 asm_exc_general_protection+0x26/0x30
RIP: 007f:0x744b63e2bab20aef
Code: Unable to access opcode bytes at 0x744b63e2bab20ac5.
RSP: 002b:0000000000000000 EFLAGS: 00000202
RAX: c3dc88498cd4a794 RBX: 2801e6725f3cda90 RCX: 374118c8afa9598a
RDX: 328885b69bf2f037 RSI: 14385714b2176cd5 RDI: fdc4cb8a25ade866
RBP: ebca1341ee2b7de7 R08: 39f044add78ae75a R09: 8b7a610dceb27612
R10: dd462a7cd104e2f1 R11: 303024ece960e034 R12: 17764b4e9d06ff11
R13: c45808b2dfa8b600 R14: b830b33bb7388259 R15: e7e087b19af2ff84
 </TASK>
ocfs2: Unmounting device (7,4) on (node local)
syz.4.1703 (14343) used greatest stack depth: 19608 bytes left
