======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.2.5983/4744 is trying to acquire lock:
ffff888115789458 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x360

but task is already holding lock:
ffff8881157894e8 (&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_create+0x195/0x460
       vfs_create+0x2c4/0x450
       filename_mknodat+0x3e8/0x660
       __se_sys_mknod+0x3a/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_update_inode_atime+0xef/0x580
       ocfs2_inode_lock_atime+0x33b/0x540
       ocfs2_readdir+0x1ac/0x4e0
       wrap_directory_iterator+0x96/0xe0
       iterate_dir+0x2e2/0x4d0
       __se_sys_getdents64+0xf1/0x280
       do_syscall_64+0x174/0x580
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#4){.+.+}-{0:0}:
       lock_release+0x199/0x3c0
       up_write+0x2d/0x4a0
       ocfs2_free_alloc_context+0x97/0x1a0
       ocfs2_write_begin_nolock+0x4164/0x41f0
       ocfs2_dio_wr_get_block+0xbab/0x17c0
       __blockdev_direct_IO+0x1590/0x3380
       ocfs2_direct_IO+0x249/0x2c0
       generic_file_direct_write+0x1d0/0x3f0
       __generic_file_write_iter+0x11d/0x230
       ocfs2_file_write_iter+0x1706/0x1f10
       iter_file_splice_write+0xa31/0x1240
       direct_splice_actor+0x101/0x160
       splice_direct_to_actor+0x57b/0xcb0
       do_splice_direct+0x195/0x290
       do_sendfile+0x52e/0x7c0
       __se_sys_sendfile64+0x144/0x1a0
       do_syscall_64+0x174/0x580
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #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
       asm_exc_page_fault+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.2.5983/4744:
 #0: ffff8881157897a0 (&sb->s_type->i_mutex_key#47){++++}-{4:4}, at: do_truncate+0x18f/0x250
 #1: ffff8881157894e8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x360

stack backtrace:
CPU: 0 UID: 0 PID: 4744 Comm: syz.2.5983 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
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7fd0cd653bd7
Code: e8 fe f9 ff ff 89 f2 48 8d 3d 5d 4f 1b 00 48 8d 35 c3 0a 1e 00 31 c0 e8 37 f8 ff ff 0f 1f 80 00 00 00 00 53 89 fb 48 83 ec 10 <64> 8b 04 25 a4 ff ff ff 85 c0 74 2a 89 fe 31 c0 bf 3c 00 00 00 e8
RSP: 002b:00007fd0ce6410a0 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007fd0cd79e0d9
RDX: 00007fd0ce6410c0 RSI: 00007fd0ce6411f0 RDI: 000000000000000b
RBP: 00007fd0cd835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fd0cda26038 R14: 00007fd0cda25fa0 R15: 00007ffc9693a988
 </TASK>
syz.2.5983 (4744) used greatest stack depth: 17272 bytes left
