======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.6.5718/15286 is trying to acquire lock:
ffff8881b1463e58 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x360

but task is already holding lock:
ffff8881b1463ee8 (&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+0x47/0x2e0
       ocfs2_init_acl+0x2fd/0x7e0
       ocfs2_mknod+0x166a/0x2240
       ocfs2_create+0x195/0x460
       path_openat+0x17ba/0x3890
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x174/0x580
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x47/0x2e0
       ocfs2_start_trans+0x3ab/0x700
       ocfs2_shutdown_local_alloc+0x1ef/0xa50
       ocfs2_dismount_volume+0x1ec/0x8d0
       generic_shutdown_super+0x13d/0x2d0
       kill_block_super+0x44/0x90
       deactivate_locked_super+0xbc/0x130
       cleanup_mnt+0x3d3/0x460
       task_work_run+0x1d9/0x270
       exit_to_user_mode_loop+0x193/0x6b0
       do_syscall_64+0x353/0x580
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#8){.+.+}-{0:0}:
       lock_release+0x199/0x3c0
       up_write+0x2d/0x410
       ocfs2_free_alloc_context+0x97/0x1a0
       ocfs2_write_begin_nolock+0x4164/0x41f0
       ocfs2_dio_wr_get_block+0xbab/0x17c0
       __blockdev_direct_IO+0x161a/0x34b0
       ocfs2_direct_IO+0x249/0x2c0
       generic_file_direct_write+0x1d0/0x3f0
       __generic_file_write_iter+0x11d/0x230
       ocfs2_file_write_iter+0x1706/0x1f10
       do_iter_readv_writev+0x612/0x8c0
       vfs_writev+0x343/0x990
       __se_sys_pwritev2+0x177/0x2a0
       do_syscall_64+0x174/0x580
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}:
       __lock_acquire+0x1520/0x2cd0
       lock_acquire+0x106/0x350
       down_write+0x96/0x200
       ocfs2_try_remove_refcount_tree+0xb6/0x360
       ocfs2_truncate_file+0xe25/0x1530
       ocfs2_setattr+0x1641/0x1d10
       notify_change+0xbba/0xea0
       do_truncate+0x1c2/0x250
       vfs_coredump+0x37c2/0x4510
       get_signal+0x1094/0x12c0
       arch_do_signal_or_restart+0xbb/0x860
       irqentry_exit+0x2aa/0x8e0
       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.6.5718/15286:
 #0: ffff8881b14641a0 (&sb->s_type->i_mutex_key#53){+.+.}-{4:4}, at: do_truncate+0x18f/0x250
 #1: ffff8881b1463ee8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x360

stack backtrace:
CPU: 1 UID: 0 PID: 15286 Comm: syz.6.5718 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+0x1520/0x2cd0
 lock_acquire+0x106/0x350
 down_write+0x96/0x200
 ocfs2_try_remove_refcount_tree+0xb6/0x360
 ocfs2_truncate_file+0xe25/0x1530
 ocfs2_setattr+0x1641/0x1d10
 notify_change+0xbba/0xea0
 do_truncate+0x1c2/0x250
 vfs_coredump+0x37c2/0x4510
 get_signal+0x1094/0x12c0
 arch_do_signal_or_restart+0xbb/0x860
 irqentry_exit+0x2aa/0x8e0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x180001eb9f
Code: Unable to access opcode bytes at 0x180001eb75.
RSP: 002b:0000200000000008 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fd592415fa0 RCX: 00007fd59219ce59
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000000
RBP: 00007fd592232e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd592416038 R14: 00007fd592415fa0 R15: 00007ffd82d62dc8
 </TASK>
ocfs2: Unmounting device (7,6) on (node local)
