======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.9.5568/28915 is trying to acquire lock:
ffff8881035d14e0 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x320

but task is already holding lock:
ffff8881035d1578 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x320

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&oi->ip_xattr_sem){++++}-{4:4}:
       lock_acquire+0x120/0x360
       down_read+0x46/0x2e0
       ocfs2_init_acl+0x2f9/0x720
       ocfs2_mknod+0x1321/0x2050
       ocfs2_create+0x1a5/0x440
       path_openat+0x14f4/0x3830
       do_filp_open+0x1fa/0x410
       do_sys_openat2+0x121/0x1c0
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (jbd2_handle){++++}-{0:0}:
       lock_acquire+0x120/0x360
       jbd2_journal_lock_updates+0xaa/0x360
       __ocfs2_flush_truncate_log+0x2ba/0x10e0
       ocfs2_truncate_log_shutdown+0x141/0x2f0
       ocfs2_dismount_volume+0x209/0x8d0
       generic_shutdown_super+0x135/0x2c0
       kill_block_super+0x44/0x90
       deactivate_locked_super+0xbc/0x130
       cleanup_mnt+0x425/0x4c0
       task_work_run+0x1d4/0x260
       exit_to_user_mode_loop+0xec/0x110
       do_syscall_64+0x2bd/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&ocfs2_sysfile_lock_key[TRUNCATE_LOG_SYSTEM_INODE]){+.+.}-{4:4}:
       lock_acquire+0x120/0x360
       down_write+0x96/0x1f0
       ocfs2_try_to_free_truncate_log+0xaf/0x360
       ocfs2_reserve_clusters_with_limit+0x3c2/0xba0
       ocfs2_extend_dir+0x701/0x4870
       ocfs2_prepare_dir_for_insert+0x2fe8/0x5450
       ocfs2_mknod+0x819/0x2050
       ocfs2_create+0x1a5/0x440
       path_openat+0x14f4/0x3830
       do_filp_open+0x1fa/0x410
       do_sys_openat2+0x121/0x1c0
       __x64_sys_creat+0x8f/0xc0
       do_syscall_64+0xfa/0x3b0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ocfs2_file_ip_alloc_sem_key){++++}-{4:4}:
       validate_chain+0xb9b/0x2140
       __lock_acquire+0xab9/0xd20
       lock_acquire+0x120/0x360
       down_write+0x96/0x1f0
       ocfs2_try_remove_refcount_tree+0xb6/0x320
       ocfs2_truncate_file+0xda0/0x1420
       ocfs2_setattr+0x1520/0x1b40
       notify_change+0xb36/0xe40
       do_truncate+0x1a4/0x220
       coredump_file+0x7cb/0xaf0
       vfs_coredump+0x1688/0x2a50
       get_signal+0x1109/0x1340
       arch_do_signal_or_restart+0x9a/0x750
       irqentry_exit_to_user_mode+0x81/0x120
       exc_page_fault+0x9f/0xf0
       asm_exc_page_fault+0x26/0x30

other info that might help us debug this:

Chain exists of:
  &ocfs2_file_ip_alloc_sem_key --> jbd2_handle --> &oi->ip_xattr_sem

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&oi->ip_xattr_sem);
                               lock(jbd2_handle);
                               lock(&oi->ip_xattr_sem);
  lock(&ocfs2_file_ip_alloc_sem_key);

 *** DEADLOCK ***

2 locks held by syz.9.5568/28915:
 #0: ffff8881035d1840 (&sb->s_type->i_mutex_key#32){++++}-{4:4}, at: do_truncate+0x171/0x220
 #1: ffff8881035d1578 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x320

stack backtrace:
CPU: 1 UID: 0 PID: 28915 Comm: syz.9.5568 Not tainted syzkaller #0 PREEMPT(full) 
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+0x189/0x250
 print_circular_bug+0x2ee/0x310
 check_noncircular+0x134/0x160
 validate_chain+0xb9b/0x2140
 __lock_acquire+0xab9/0xd20
 lock_acquire+0x120/0x360
 down_write+0x96/0x1f0
 ocfs2_try_remove_refcount_tree+0xb6/0x320
 ocfs2_truncate_file+0xda0/0x1420
 ocfs2_setattr+0x1520/0x1b40
 notify_change+0xb36/0xe40
 do_truncate+0x1a4/0x220
 coredump_file+0x7cb/0xaf0
 vfs_coredump+0x1688/0x2a50
 get_signal+0x1109/0x1340
 arch_do_signal_or_restart+0x9a/0x750
 irqentry_exit_to_user_mode+0x81/0x120
 exc_page_fault+0x9f/0xf0
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0x7f689318ec29
Code: Unable to access opcode bytes at 0x7f689318ebff.
RSP: 002b:00007f6894035f08 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000058 RCX: 00007f689318ec29
RDX: 00007f6894035f20 RSI: 0000000000000058 RDI: 00007f6894035f20
RBP: 00007f6893211e41 R08: 0000000000000000 R09: 0000000000000058
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f68933d6038 R14: 00007f68933d5fa0 R15: 00007fffc6ddf188
 </TASK>
ocfs2: Unmounting device (7,9) on (node local)
