======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.3.119/6423 is trying to acquire lock:
ffff8881b75ab1e0 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x320

but task is already holding lock:
ffff8881b75ab278 (&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:

-> #4 (&oi->ip_xattr_sem){++++}-{4:4}:
       lock_acquire+0x120/0x360
       down_read+0x46/0x2e0
       ocfs2_init_acl+0x2f9/0x720
       ocfs2_mknod+0x1321/0x2050
       ocfs2_mkdir+0x191/0x440
       vfs_mkdir+0x306/0x510
       do_mkdirat+0x247/0x590
       __x64_sys_mkdirat+0x87/0xa0
       do_syscall_64+0xfa/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #3 (jbd2_handle){++++}-{0:0}:
       lock_acquire+0x120/0x360
       start_this_handle+0x1fa7/0x21c0
       jbd2__journal_start+0x2c1/0x5b0
       jbd2_journal_start+0x2a/0x40
       ocfs2_start_trans+0x376/0x6d0
       ocfs2_reserve_local_alloc_bits+0xb04/0x24e0
       ocfs2_reserve_clusters_with_limit+0x1be/0xba0
       ocfs2_mknod+0xe32/0x2050
       ocfs2_mkdir+0x191/0x440
       vfs_mkdir+0x306/0x510
       do_mkdirat+0x247/0x590
       __x64_sys_mkdirat+0x87/0xa0
       do_syscall_64+0xfa/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       lock_acquire+0x120/0x360
       down_read+0x46/0x2e0
       ocfs2_start_trans+0x36a/0x6d0
       ocfs2_reserve_local_alloc_bits+0xb04/0x24e0
       ocfs2_reserve_clusters_with_limit+0x1be/0xba0
       ocfs2_mknod+0xe32/0x2050
       ocfs2_mkdir+0x191/0x440
       vfs_mkdir+0x306/0x510
       do_mkdirat+0x247/0x590
       __x64_sys_mkdirat+0x87/0xa0
       do_syscall_64+0xfa/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#3){.+.+}-{0:0}:
       lock_acquire+0x120/0x360
       ocfs2_start_trans+0x26b/0x6d0
       ocfs2_write_begin_nolock+0x26ee/0x4340
       ocfs2_write_begin+0x1bb/0x310
       generic_perform_write+0x2c5/0x900
       ocfs2_file_write_iter+0x157a/0x1d10
       vfs_write+0x5c9/0xb30
       ksys_write+0x145/0x250
       do_syscall_64+0xfa/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&oi->ip_alloc_sem){++++}-{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+0xc1a/0xf40
       do_truncate+0x1a4/0x220
       coredump_file+0x7cb/0xaf0
       vfs_coredump+0x1693/0x2a60
       get_signal+0x1108/0x1340
       arch_do_signal_or_restart+0xa0/0x790
       irqentry_exit_to_user_mode+0x7e/0x110
       exc_general_protection+0x171/0x200
       asm_exc_general_protection+0x26/0x30

other info that might help us debug this:

Chain exists of:
  &oi->ip_alloc_sem --> 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(&oi->ip_alloc_sem);

 *** DEADLOCK ***

2 locks held by syz.3.119/6423:
 #0: ffff8881b75ab540 (&sb->s_type->i_mutex_key#24){+.+.}-{4:4}, at: do_truncate+0x171/0x220
 #1: ffff8881b75ab278 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x320

stack backtrace:
CPU: 1 UID: 0 PID: 6423 Comm: syz.3.119 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+0xc1a/0xf40
 do_truncate+0x1a4/0x220
 coredump_file+0x7cb/0xaf0
 vfs_coredump+0x1693/0x2a60
 get_signal+0x1108/0x1340
 arch_do_signal_or_restart+0xa0/0x790
 irqentry_exit_to_user_mode+0x7e/0x110
 exc_general_protection+0x171/0x200
 asm_exc_general_protection+0x26/0x30
RIP: 0033:0x7f619878f751
Code: 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:0000200000000380 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f61989e5fa0 RCX: 00007f619878f749
RDX: 0000200000000140 RSI: 0000200000000380 RDI: 0000000080000000
RBP: 00007f6198813f91 R08: 0000200000000600 R09: 0000200000000600
R10: 0000200000000180 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f61989e6038 R14: 00007f61989e5fa0 R15: 00007fff58ee4138
 </TASK>
ocfs2: Unmounting device (7,3) on (node local)
