======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.8.1732/16173 is trying to acquire lock:
ffff8881ad4a5240 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x16a/0x4940

but task is already holding lock:
ffff8880205addf8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_xattr_set+0x475/0x13e0

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+0x1679/0x2290
       vfs_mknod+0x447/0x610
       filename_mknodat+0x3cb/0x660
       __se_sys_mknod+0x3a/0x150
       do_syscall_64+0x14d/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+0x1181/0x2290
       vfs_mknod+0x447/0x610
       filename_mknodat+0x3cb/0x660
       __se_sys_mknod+0x3a/0x150
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#3){.+.+}-{0:0}:
       ocfs2_start_trans+0x2ac/0x700
       ocfs2_create_refcount_tree+0x355/0x1350
       ocfs2_reflink_remap_blocks+0x2fe/0x1a30
       ocfs2_remap_file_range+0x451/0x6f0
       vfs_copy_file_range+0xd80/0x1370
       __se_sys_copy_file_range+0x2fb/0x480
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}:
       __lock_acquire+0x15a5/0x2cf0
       lock_acquire+0xf0/0x2e0
       down_write+0x96/0x200
       ocfs2_reserve_suballoc_bits+0x16a/0x4940
       ocfs2_reserve_new_metadata_blocks+0x415/0x9a0
       ocfs2_init_xattr_set_ctxt+0x2f5/0x790
       ocfs2_xattr_set+0xc42/0x13e0
       __vfs_setxattr+0x43c/0x480
       __vfs_setxattr_noperm+0x12d/0x660
       vfs_setxattr+0x163/0x360
       filename_setxattr+0x296/0x630
       path_setxattrat+0x3eb/0x440
       __x64_sys_lsetxattr+0xbf/0xe0
       do_syscall_64+0x14d/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.8.1732/16173:
 #0: ffff88816ea56420 (sb_writers#16){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff8880205ae0c0 (&sb->s_type->i_mutex_key#39){+.+.}-{4:4}, at: vfs_setxattr+0x13e/0x360
 #2: ffff8880205addf8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_xattr_set+0x475/0x13e0

stack backtrace:
CPU: 0 UID: 0 PID: 16173 Comm: syz.8.1732 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+0x15a5/0x2cf0
 lock_acquire+0xf0/0x2e0
 down_write+0x96/0x200
 ocfs2_reserve_suballoc_bits+0x16a/0x4940
 ocfs2_reserve_new_metadata_blocks+0x415/0x9a0
 ocfs2_init_xattr_set_ctxt+0x2f5/0x790
 ocfs2_xattr_set+0xc42/0x13e0
 __vfs_setxattr+0x43c/0x480
 __vfs_setxattr_noperm+0x12d/0x660
 vfs_setxattr+0x163/0x360
 filename_setxattr+0x296/0x630
 path_setxattrat+0x3eb/0x440
 __x64_sys_lsetxattr+0xbf/0xe0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f387c59c799
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:00007f387d3d8028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bd
RAX: ffffffffffffffda RBX: 00007f387c815fa0 RCX: 00007f387c59c799
RDX: 0000200000000100 RSI: 0000200000000080 RDI: 0000200000000000
RBP: 00007f387c632c99 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000008d R11: 0000000000000246 R12: 0000000000000000
R13: 00007f387c816038 R14: 00007f387c815fa0 R15: 00007ffc5a8babe8
 </TASK>
