======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.2.110/6665 is trying to acquire lock:
ffff888115d15d60 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x340

but task is already holding lock:
ffff888115d15df8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x340

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&oi->ip_xattr_sem){++++}-{4:4}:
       lock_acquire+0x11f/0x350
       down_read+0x46/0x2e0
       ocfs2_init_acl+0x309/0x780
       ocfs2_mknod+0x1440/0x2230
       ocfs2_create+0x1a5/0x460
       path_openat+0x14fd/0x3890
       do_filp_open+0x22d/0x490
       do_sys_openat2+0x12f/0x1d0
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0xf0/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #3 (jbd2_handle){++++}-{0:0}:
       lock_acquire+0x11f/0x350
       start_this_handle+0x2074/0x2290
       jbd2__journal_start+0x2c0/0x5b0
       jbd2_journal_start+0x2a/0x40
       ocfs2_start_trans+0x3b7/0x700
       ocfs2_mknod+0xf4e/0x2230
       ocfs2_create+0x1a5/0x460
       path_openat+0x14fd/0x3890
       do_filp_open+0x22d/0x490
       do_sys_openat2+0x12f/0x1d0
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0xf0/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&journal->j_trans_barrier){.+.+}-{4:4}:
       lock_acquire+0x11f/0x350
       down_read+0x46/0x2e0
       ocfs2_start_trans+0x3ab/0x700
       ocfs2_mknod+0xf4e/0x2230
       ocfs2_create+0x1a5/0x460
       path_openat+0x14fd/0x3890
       do_filp_open+0x22d/0x490
       do_sys_openat2+0x12f/0x1d0
       __x64_sys_openat+0x138/0x170
       do_syscall_64+0xf0/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (sb_internal#6){.+.+}-{0:0}:
       lock_acquire+0x11f/0x350
       ocfs2_start_trans+0x2ac/0x700
       ocfs2_setattr+0xc81/0x1be0
       notify_change+0xc1a/0xf40
       do_truncate+0x1c2/0x250
       vfs_truncate+0x4b4/0x540
       do_sys_truncate+0xf1/0x1c0
       __x64_sys_truncate+0x5b/0x70
       do_syscall_64+0xf0/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&oi->ip_alloc_sem){++++}-{4:4}:
       validate_chain+0xb9a/0x2130
       __lock_acquire+0xab8/0xd20
       lock_acquire+0x11f/0x350
       down_write+0x96/0x200
       ocfs2_try_remove_refcount_tree+0xb6/0x340
       ocfs2_truncate_file+0xe04/0x14d0
       ocfs2_setattr+0x15a0/0x1be0
       notify_change+0xc1a/0xf40
       do_truncate+0x1c2/0x250
       path_openat+0x30c2/0x3890
       do_filp_open+0x22d/0x490
       do_sys_openat2+0x12f/0x1d0
       __x64_sys_open+0x11e/0x150
       do_syscall_64+0xf0/0xfa0
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &oi->ip_alloc_sem --> jbd2_handle --> &oi->ip_xattr_sem

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&oi->ip_xattr_sem);
                               lock(jbd2_handle);
                               lock(&oi->ip_xattr_sem);
  lock(&oi->ip_alloc_sem);

 *** DEADLOCK ***

3 locks held by syz.2.110/6665:
 #0: ffff88816fa38420 (sb_writers#29){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90
 #1: ffff888115d160c0 (&sb->s_type->i_mutex_key#35){+.+.}-{4:4}, at: do_truncate+0x18f/0x250
 #2: ffff888115d15df8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x340

stack backtrace:
CPU: 0 UID: 0 PID: 6665 Comm: syz.2.110 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+0x1a9/0x280
 print_circular_bug+0x2ed/0x300
 check_noncircular+0x134/0x160
 validate_chain+0xb9a/0x2130
 __lock_acquire+0xab8/0xd20
 lock_acquire+0x11f/0x350
 down_write+0x96/0x200
 ocfs2_try_remove_refcount_tree+0xb6/0x340
 ocfs2_truncate_file+0xe04/0x14d0
 ocfs2_setattr+0x15a0/0x1be0
 notify_change+0xc1a/0xf40
 do_truncate+0x1c2/0x250
 path_openat+0x30c2/0x3890
 do_filp_open+0x22d/0x490
 do_sys_openat2+0x12f/0x1d0
 __x64_sys_open+0x11e/0x150
 do_syscall_64+0xf0/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2c4fd9acb9
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:00007f2c50b6f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f2c50015fa0 RCX: 00007f2c4fd9acb9
RDX: 0000000000000020 RSI: 000000000014da7e RDI: 00002000000001c0
RBP: 00007f2c4fe08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2c50016038 R14: 00007f2c50015fa0 R15: 00007ffc3aa5cef8
 </TASK>
