ocfs2: Mounting device (7,6) on (node local, slot 0) with ordered data mode.
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.6.3018/14271 is trying to acquire lock:
ffff8881a83309a0 (&ocfs2_sysfile_lock_key[TRUNCATE_LOG_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_xattr_set+0xbeb/0x13a0

but task is already holding lock:
ffff8881a8334ce8 (&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/0x2240
       ocfs2_create+0x195/0x460
       path_openat+0x17ba/0x3890
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x174/0x580
       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/0x2240
       ocfs2_create+0x195/0x460
       path_openat+0x17ba/0x3890
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x174/0x580
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#4){.+.+}-{0:0}:
       ocfs2_start_trans+0x2ac/0x700
       ocfs2_remove_btree_range+0x819/0x15f0
       ocfs2_commit_truncate+0xc60/0x2560
       ocfs2_truncate_file+0xd24/0x1530
       ocfs2_setattr+0x1641/0x1d10
       notify_change+0xbba/0xea0
       do_truncate+0x1c2/0x250
       vfs_truncate+0x4b4/0x540
       ksys_truncate+0xf3/0x1c0
       __x64_sys_truncate+0x5b/0x70
       do_syscall_64+0x174/0x580
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ocfs2_sysfile_lock_key[TRUNCATE_LOG_SYSTEM_INODE]){+.+.}-{4:4}:
       __lock_acquire+0x1520/0x2cd0
       lock_acquire+0x106/0x350
       down_write+0x96/0x200
       ocfs2_xattr_set+0xbeb/0x13a0
       __vfs_setxattr+0x442/0x480
       __vfs_setxattr_noperm+0x12a/0x660
       vfs_setxattr+0x163/0x360
       file_setxattr+0x1d9/0x2b0
       path_setxattrat+0x3cc/0x450
       __x64_sys_fsetxattr+0xbc/0xe0
       do_syscall_64+0x174/0x580
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &ocfs2_sysfile_lock_key[TRUNCATE_LOG_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[TRUNCATE_LOG_SYSTEM_INODE]);

 *** DEADLOCK ***

3 locks held by syz.6.3018/14271:
 #0: ffff8881119ac410 (sb_writers#18){.+.+}-{0:0}, at: mnt_want_write_file+0x60/0x200
 #1: ffff8881a8334fa0 (&sb->s_type->i_mutex_key#30){+.+.}-{4:4}, at: vfs_setxattr+0x13e/0x360
 #2: ffff8881a8334ce8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_xattr_set+0x494/0x13a0

stack backtrace:
CPU: 1 UID: 0 PID: 14271 Comm: syz.6.3018 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+0x106/0x350
 down_write+0x96/0x200
 ocfs2_xattr_set+0xbeb/0x13a0
 __vfs_setxattr+0x442/0x480
 __vfs_setxattr_noperm+0x12a/0x660
 vfs_setxattr+0x163/0x360
 file_setxattr+0x1d9/0x2b0
 path_setxattrat+0x3cc/0x450
 __x64_sys_fsetxattr+0xbc/0xe0
 do_syscall_64+0x174/0x580
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f85fb39ce59
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:00007f85fc24f028 EFLAGS: 00000246 ORIG_RAX: 00000000000000be
RAX: ffffffffffffffda RBX: 00007f85fb615fa0 RCX: 00007f85fb39ce59
RDX: 0000200000000240 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007f85fb432e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f85fb616038 R14: 00007f85fb615fa0 R15: 00007ffc42c718e8
 </TASK>
