======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.115/6353 is trying to acquire lock:
ffff888118362360 (&oi->ip_alloc_sem){+.+.}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x320

but task is already holding lock:
ffff8881183623f8 (&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_extend_dir+0x701/0x4870
       ocfs2_prepare_dir_for_insert+0x2fe8/0x5450
       ocfs2_mknod+0x819/0x2050
       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_extend_dir+0x701/0x4870
       ocfs2_prepare_dir_for_insert+0x2fe8/0x5450
       ocfs2_mknod+0x819/0x2050
       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#4){.+.+}-{0:0}:
       lock_acquire+0x120/0x360
       ocfs2_start_trans+0x26b/0x6d0
       ocfs2_truncate_file+0x643/0x1420
       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_page_fault+0xab/0x100
       asm_exc_page_fault+0x26/0x30

-> #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_page_fault+0xab/0x100
       asm_exc_page_fault+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.0.115/6353:
 #0: ffff8881183626c0 (&sb->s_type->i_mutex_key#28){+.+.}-{4:4}, at: do_truncate+0x171/0x220
 #1: ffff8881183623f8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x320

stack backtrace:
CPU: 0 UID: 0 PID: 6353 Comm: syz.0.115 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_page_fault+0xab/0x100
 asm_exc_page_fault+0x26/0x30
RIP: 0033:0xc9cc
Code: Unable to access opcode bytes at 0xc9a2.
RSP: 002b:0000200000000058 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f34661e6090 RCX: 00007f3465f8f7c9
RDX: 0000200000000080 RSI: 0000200000000050 RDI: 0000000000001600
RBP: 00007f3465ff297f R08: 0000200000000140 R09: 0000200000000140
R10: 0000200000000100 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f34661e6128 R14: 00007f34661e6090 R15: 00007ffc4a441118
 </TASK>
syz.0.115 (6353) used greatest stack depth: 16648 bytes left
