======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.3.1324/13735 is trying to acquire lock:
ffff888120c9cc58 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x360

but task is already holding lock:
ffff888120c9cce8 (&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
       path_openat+0x133a/0x3830
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x115/0x200
       __x64_sys_creat+0x8f/0xc0
       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_reserve_suballoc_bits+0x7b7/0x4850
       ocfs2_reserve_new_metadata_blocks+0x415/0x9a0
       ocfs2_extend_dir+0xd35/0x4b60
       ocfs2_prepare_dir_for_insert+0x339a/0x5190
       ocfs2_mknod+0xa16/0x2240
       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

-> #1 (sb_internal#5){.+.+}-{0:0}:
       ocfs2_start_trans+0x2ac/0x700
       ocfs2_write_begin_nolock+0x277f/0x41f0
       ocfs2_write_begin+0x1ba/0x310
       generic_perform_write+0x2d5/0x8f0
       ocfs2_file_write_iter+0x1706/0x1f10
       vfs_write+0x612/0xba0
       ksys_write+0x150/0x270
       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/0x910
       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.3.1324/13735:
 #0: ffff888120c9cfa0 (&sb->s_type->i_mutex_key#44){+.+.}-{4:4}, at: do_truncate+0x18f/0x250
 #1: ffff888120c9cce8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x360

stack backtrace:
CPU: 0 UID: 0 PID: 13735 Comm: syz.3.1324 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/0x910
 exc_general_protection+0x16b/0x1f0
 asm_exc_general_protection+0x26/0x30
RIP: 0033:0x7fc0af39e0e1
Code: 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 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:0000200000000060 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fc0af625fa0 RCX: 00007fc0af39e0d9
RDX: 00002000000000c0 RSI: 0000200000000060 RDI: 0000000002240000
RBP: 00007fc0af435024 R08: 0000200000000380 R09: 0000200000000380
R10: 0000200000000280 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fc0af626038 R14: 00007fc0af625fa0 R15: 00007ffc0c50ade8
 </TASK>
