======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.5.1778/12396 is trying to acquire lock:
ffff8881b1da5240 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x170/0x4960

but task is already holding lock:
ffff8881b1da06f8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_xattr_set+0x494/0x13a0

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+0x47/0x2e0
       ocfs2_init_acl+0x2fd/0x7e0
       ocfs2_mknod+0x166a/0x2270
       ocfs2_create+0x195/0x490
       path_openat+0x17ba/0x3890
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x170/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       down_read+0x47/0x2e0
       ocfs2_start_trans+0x3ab/0x700
       ocfs2_mknod+0x116a/0x2270
       ocfs2_create+0x195/0x490
       path_openat+0x17ba/0x3890
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x170/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#4){.+.+}-{0:0}:
       ocfs2_start_trans+0x2ac/0x700
       ocfs2_dio_end_io+0x8b5/0x1210
       dio_complete+0x251/0x790
       __blockdev_direct_IO+0x2cbc/0x3310
       ocfs2_direct_IO+0x249/0x2c0
       generic_file_direct_write+0x1d0/0x3f0
       __generic_file_write_iter+0x11d/0x230
       ocfs2_file_write_iter+0x1706/0x1f70
       iter_file_splice_write+0xa31/0x1240
       direct_splice_actor+0x101/0x160
       splice_direct_to_actor+0x57b/0xcb0
       do_splice_direct+0x195/0x290
       do_sendfile+0x52e/0x7c0
       __se_sys_sendfile64+0x144/0x1a0
       do_syscall_64+0x170/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}:
       __lock_acquire+0x1520/0x2cd0
       lock_acquire+0xf0/0x2e0
       down_write+0x96/0x200
       ocfs2_reserve_suballoc_bits+0x170/0x4960
       ocfs2_reserve_new_metadata_blocks+0x415/0x9a0
       ocfs2_init_xattr_set_ctxt+0x2f5/0x790
       ocfs2_xattr_set+0xc78/0x13a0
       __vfs_setxattr+0x442/0x480
       __vfs_setxattr_noperm+0x12a/0x660
       vfs_setxattr+0x163/0x360
       filename_setxattr+0x296/0x630
       path_setxattrat+0x408/0x450
       __x64_sys_setxattr+0xbc/0xe0
       do_syscall_64+0x170/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE] --> &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_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]);

 *** DEADLOCK ***

3 locks held by syz.5.1778/12396:
 #0: ffff888104eb4420 (sb_writers#19){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8881b1da09c0 (&sb->s_type->i_mutex_key#34){+.+.}-{4:4}, at: vfs_setxattr+0x13e/0x360
 #2: ffff8881b1da06f8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_xattr_set+0x494/0x13a0

stack backtrace:
CPU: 0 UID: 0 PID: 12396 Comm: syz.5.1778 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+0x1520/0x2cd0
 lock_acquire+0xf0/0x2e0
 down_write+0x96/0x200
 ocfs2_reserve_suballoc_bits+0x170/0x4960
 ocfs2_reserve_new_metadata_blocks+0x415/0x9a0
 ocfs2_init_xattr_set_ctxt+0x2f5/0x790
 ocfs2_xattr_set+0xc78/0x13a0
 __vfs_setxattr+0x442/0x480
 __vfs_setxattr_noperm+0x12a/0x660
 vfs_setxattr+0x163/0x360
 filename_setxattr+0x296/0x630
 path_setxattrat+0x408/0x450
 __x64_sys_setxattr+0xbc/0xe0
 do_syscall_64+0x170/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9e95d9e019
Code: ff c3 66 2e 0f 1f 84 00 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
RSP: 002b:00007f9e96cb7028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f9e96026090 RCX: 00007f9e95d9e019
RDX: 00002000000002c0 RSI: 0000200000000280 RDI: 0000200000000180
RBP: 00007f9e95e3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000018 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9e96026128 R14: 00007f9e96026090 R15: 00007ffede729048
 </TASK>
