======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.7.116/6756 is trying to acquire lock:
ffff888117e523f8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_init_acl+0x2f7/0x7a0

but task is already holding lock:
ffff88816fe848e8 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x36a/0x6d0

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #3 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x47/0x2e0
       ocfs2_start_trans+0x36a/0x6d0
       ocfs2_mknod+0xe71/0x2030
       ocfs2_create+0x195/0x420
       vfs_create+0x3aa/0x400
       do_mknodat+0x3ea/0x610
       __x64_sys_mknodat+0xa7/0xc0
       do_syscall_64+0xec/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (sb_internal#2){.+.+}-{0:0}:
       ocfs2_start_trans+0x26b/0x6d0
       ocfs2_write_begin_nolock+0x1c90/0x4300
       ocfs2_write_begin+0x1bb/0x310
       generic_perform_write+0x2c5/0x900
       ocfs2_file_write_iter+0x1582/0x1cf0
       vfs_write+0x5c9/0xb30
       ksys_write+0x145/0x250
       do_syscall_64+0xec/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&oi->ip_alloc_sem){++++}-{4:4}:
       down_write+0x96/0x1f0
       ocfs2_try_remove_refcount_tree+0xb6/0x320
       ocfs2_truncate_file+0xd92/0x13e0
       ocfs2_setattr+0x155e/0x1bb0
       notify_change+0xc1a/0xf40
       do_truncate+0x1a4/0x220
       do_ftruncate+0x4a5/0x560
       __x64_sys_ftruncate+0x92/0xf0
       do_syscall_64+0xec/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&oi->ip_xattr_sem){++++}-{4:4}:
       __lock_acquire+0x15a6/0x2cf0
       lock_acquire+0x107/0x340
       down_read+0x47/0x2e0
       ocfs2_init_acl+0x2f7/0x7a0
       ocfs2_mknod+0x12ff/0x2030
       ocfs2_mkdir+0x181/0x420
       vfs_mkdir+0x512/0x5b0
       do_mkdirat+0x276/0x4b0
       __x64_sys_mkdirat+0x87/0xa0
       do_syscall_64+0xec/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &oi->ip_xattr_sem --> sb_internal#2 --> &journal->j_trans_barrier

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(&journal->j_trans_barrier);
                               lock(sb_internal#2);
                               lock(&journal->j_trans_barrier);
  rlock(&oi->ip_xattr_sem);

 *** DEADLOCK ***

8 locks held by syz.7.116/6756:
 #0: ffff88811481a420 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff888117e526c0 (&type->i_mutex_dir_key#9/1){+.+.}-{4:4}, at: filename_create+0x1fb/0x360
 #2: ffff8881add9d240 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x164/0x4600
 #3: ffff8881add9ef40 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x164/0x4600
 #4: ffff8881add9b540 (&ocfs2_sysfile_lock_key[LOCAL_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_local_alloc_bits+0x125/0x24b0
 #5: ffff88811481a610 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_mknod+0xe71/0x2030
 #6: ffff88816fe848e8 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x36a/0x6d0
 #7: ffff88816cc98950 (jbd2_handle#2){.+.+}-{0:0}, at: start_this_handle+0x1f87/0x21c0

stack backtrace:
CPU: 0 UID: 0 PID: 6756 Comm: syz.7.116 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+0xe8/0x150
 print_circular_bug+0x2e2/0x300
 check_noncircular+0x12e/0x150
 __lock_acquire+0x15a6/0x2cf0
 lock_acquire+0x107/0x340
 down_read+0x47/0x2e0
 ocfs2_init_acl+0x2f7/0x7a0
 ocfs2_mknod+0x12ff/0x2030
 ocfs2_mkdir+0x181/0x420
 vfs_mkdir+0x512/0x5b0
 do_mkdirat+0x276/0x4b0
 __x64_sys_mkdirat+0x87/0xa0
 do_syscall_64+0xec/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb9ee78df17
Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb9ef653e68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007fb9ef653ef0 RCX: 00007fb9ee78df17
RDX: 00000000000001ff RSI: 00002000000000c0 RDI: 00000000ffffff9c
RBP: 0000200000000080 R08: 0000200000000140 R09: 0000000000000000
R10: 0000200000000080 R11: 0000000000000246 R12: 00002000000000c0
R13: 00007fb9ef653eb0 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
