======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Tainted: G             L     
------------------------------------------------------
syz.7.1744/24971 is trying to acquire lock:
ffff888021f4a3f8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_init_acl+0x2fd/0x7e0

but task is already holding lock:
ffff8881158d80e8 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x3ab/0x700

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+0x3ab/0x700
       ocfs2_mknod+0x1181/0x2290
       ocfs2_create+0x195/0x490
       path_openat+0x1395/0x3860
       do_file_open+0x23e/0x4a0
       do_sys_openat2+0x113/0x200
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (sb_internal#6){.+.+}-{0:0}:
       ocfs2_start_trans+0x2ac/0x700
       ocfs2_dio_end_io+0x8b5/0x1210
       dio_complete+0x25b/0x790
       __blockdev_direct_IO+0x2e5d/0x34e0
       ocfs2_direct_IO+0x251/0x2c0
       generic_file_direct_write+0x1db/0x3e0
       __generic_file_write_iter+0x11d/0x230
       ocfs2_file_write_iter+0x1663/0x1ed0
       do_iter_readv_writev+0x619/0x8c0
       vfs_writev+0x33c/0x990
       __se_sys_pwritev2+0x184/0x2a0
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}:
       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_setxattr+0xbc/0xe0
       do_syscall_64+0x14d/0xf80
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&oi->ip_xattr_sem){++++}-{4:4}:
       __lock_acquire+0x15a5/0x2cf0
       lock_acquire+0xf0/0x2e0
       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

other info that might help us debug this:

Chain exists of:
  &oi->ip_xattr_sem --> sb_internal#6 --> &journal->j_trans_barrier

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  rlock(&journal->j_trans_barrier);
                               lock(sb_internal#6);
                               lock(&journal->j_trans_barrier);
  rlock(&oi->ip_xattr_sem);

 *** DEADLOCK ***

8 locks held by syz.7.1744/24971:
 #0: ffff88801d584420 (sb_writers#28){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff888021f4a6c0 (&type->i_mutex_dir_key#16/1){+.+.}-{4:4}, at: filename_create+0x200/0x370
 #2: ffff88811a9de0c0 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x16a/0x4940
 #3: ffff88811a9d89c0 (&ocfs2_sysfile_lock_key[EXTENT_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x16a/0x4940
 #4: ffff88811a9def40 (&ocfs2_sysfile_lock_key[GLOBAL_BITMAP_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x16a/0x4940
 #5: ffff88801d584610 (sb_internal#6){.+.+}-{0:0}, at: ocfs2_mknod+0x1181/0x2290
 #6: ffff8881158d80e8 (&journal->j_trans_barrier){.+.+}-{4:4}, at: ocfs2_start_trans+0x3ab/0x700
 #7: ffff88816cc04950 (jbd2_handle#2){.+.+}-{0:0}, at: start_this_handle+0x2054/0x2290

stack backtrace:
CPU: 1 UID: 0 PID: 24971 Comm: syz.7.1744 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_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
RIP: 0033:0x7fd73939c799
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:00007fd73a2d0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007fd739616090 RCX: 00007fd73939c799
RDX: 000000000000070f RSI: 0000000000006000 RDI: 0000200000000100
RBP: 00007fd739432c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd739616128 R14: 00007fd739616090 R15: 00007ffdc63bae28
 </TASK>
