ceph: No mds server is up or the cluster is laggy
Increase LOCKDEP_CIRCULAR_QUEUE_BITS to avoid this warning:
------------[ cut here ]------------
lockdep bfs error:-1
WARNING: CPU: 1 PID: 19839 at kernel/locking/lockdep.c:2090 print_bfs_bug+0x29/0x50 kernel/locking/lockdep.c:2090
Modules linked in:
CPU: 1 UID: 0 PID: 19839 Comm: syz.2.2643 Not tainted 6.12.0-rc1-syzkaller-ge32cde8d2bd7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:print_bfs_bug+0x29/0x50 kernel/locking/lockdep.c:2090
Code: 90 55 53 89 fb e8 a7 90 22 03 89 c5 e8 50 fd ff ff 85 ed 74 19 83 fb ff 74 1b 90 48 c7 c7 60 d6 6c 8b 89 de e8 78 ae e4 ff 90 <0f> 0b 90 90 5b 5d c3 cc cc cc cc 48 c7 c7 00 d6 6c 8b e8 40 73 03
RSP: 0018:ffffc90004b57028 EFLAGS: 00010086
RAX: 0000000000000000 RBX: 00000000ffffffff RCX: ffffffff814e7329
RDX: ffff888020f93c00 RSI: ffffffff814e7336 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: fffffffffffe96e0 R12: ffff888020f94758
R13: ffff888020f94780 R14: ffffc90004b57140 R15: dffffc0000000000
FS:  00007f33c06f96c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055557f99f808 CR3: 000000007f530000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 check_irq_usage+0x5c7/0x1290 kernel/locking/lockdep.c:2847
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3280 [inline]
 validate_chain kernel/locking/lockdep.c:3904 [inline]
 __lock_acquire+0x2521/0x3ce0 kernel/locking/lockdep.c:5202
 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5825
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
 debug_object_deactivate+0x13c/0x370 lib/debugobjects.c:763
 debug_hrtimer_deactivate kernel/time/hrtimer.c:428 [inline]
 debug_deactivate kernel/time/hrtimer.c:484 [inline]
 remove_hrtimer kernel/time/hrtimer.c:1153 [inline]
 hrtimer_try_to_cancel+0x1b7/0x2f0 kernel/time/hrtimer.c:1338
 update_curr_dl_se+0x3ab/0x5d0 kernel/sched/deadline.c:1509
 update_curr+0x427/0x5a0 kernel/sched/fair.c:1245
 put_prev_entity+0x123/0x260 kernel/sched/fair.c:5644
 pick_next_task_fair+0x8ec/0x1280 kernel/sched/fair.c:8907
 __pick_next_task+0xf1/0x6c0 kernel/sched/core.c:5955
 pick_next_task kernel/sched/core.c:6053 [inline]
 __schedule+0x4cc/0x5750 kernel/sched/core.c:6629
 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:6997
 irqentry_exit+0x36/0x90 kernel/entry/common.c:354
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire.part.0+0x155/0x380 kernel/locking/lockdep.c:5790
Code: b8 ff ff ff ff 65 0f c1 05 f0 d4 97 7e 83 f8 01 0f 85 d0 01 00 00 9c 58 f6 c4 02 0f 85 e5 01 00 00 48 85 ed 0f 85 b6 01 00 00 <48> b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 00 00 00 48 c7
RSP: 0018:ffffc90004b579d8 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 1ffff9200096af3c RCX: 0000000000000001
RDX: 0000000000000001 RSI: ffffffff8b6cd340 RDI: ffffffff8bd19d40
RBP: 0000000000000200 R08: 000000000028df08 R09: fffffbfff2df7d17
R10: ffffffff96fbe8bf R11: 1ffffffff2c74540 R12: 0000000000000000
R13: ffff88814234ed48 R14: 0000000000000000 R15: 0000000000000000
 touch_wq_lockdep_map+0xad/0x1c0 kernel/workqueue.c:3880
 __flush_workqueue+0x129/0x1200 kernel/workqueue.c:3922
 drain_workqueue+0x18f/0x3d0 kernel/workqueue.c:4086
 destroy_workqueue+0xc2/0xaa0 kernel/workqueue.c:5830
 destroy_fs_client+0x198/0x360 fs/ceph/super.c:896
 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473
 ceph_get_tree+0x14e1/0x1e10 fs/ceph/super.c:1363
 vfs_get_tree+0x8f/0x380 fs/super.c:1800
 vfs_cmd_create+0xd7/0x2a0 fs/fsopen.c:225
 vfs_fsconfig_locked fs/fsopen.c:289 [inline]
 __do_sys_fsconfig+0x884/0xbe0 fs/fsopen.c:472
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f33bf979eb9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f33c06f9038 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00007f33bfb15f80 RCX: 00007f33bf979eb9
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 00007f33bf9e793e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f33bfb15f80 R15: 00007ffde8420db8
 </TASK>
----------------
Code disassembly (best guess):
   0:	b8 ff ff ff ff       	mov    $0xffffffff,%eax
   5:	65 0f c1 05 f0 d4 97 	xadd   %eax,%gs:0x7e97d4f0(%rip)        # 0x7e97d4fd
   c:	7e
   d:	83 f8 01             	cmp    $0x1,%eax
  10:	0f 85 d0 01 00 00    	jne    0x1e6
  16:	9c                   	pushf
  17:	58                   	pop    %rax
  18:	f6 c4 02             	test   $0x2,%ah
  1b:	0f 85 e5 01 00 00    	jne    0x206
  21:	48 85 ed             	test   %rbp,%rbp
  24:	0f 85 b6 01 00 00    	jne    0x1e0
* 2a:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax <-- trapping instruction
  31:	fc ff df
  34:	48 01 c3             	add    %rax,%rbx
  37:	48 c7 03 00 00 00 00 	movq   $0x0,(%rbx)
  3e:	48                   	rex.W
  3f:	c7                   	.byte 0xc7