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: kernel/locking/lockdep.c:2075 at print_bfs_bug+0x7f/0xf0 kernel/locking/lockdep.c:2075, CPU#0: syz.4.2343/17634 Modules linked in: CPU: 0 UID: 0 PID: 17634 Comm: syz.4.2343 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/05/2026 RIP: 0010:print_bfs_bug+0x81/0xf0 kernel/locking/lockdep.c:2075 Code: 09 48 c7 c7 11 26 4e 8e e8 6c 13 e9 09 65 ff 0d 8d 90 a5 12 85 ed 74 17 83 fb ff 0f 84 b0 43 3b ff 48 8d 3d f1 90 61 0f 89 de <67> 48 0f b9 3a 5b 5d c3 cc cc cc cc 90 e8 2d 9e 3f 03 85 c0 74 1d RSP: 0018:ffffc9000528f178 EFLAGS: 00010086 RAX: 000000000000003b RBX: 00000000ffffffff RCX: 0000000000000000 RDX: 000000000000003b RSI: 00000000ffffffff RDI: ffffffff91484750 RBP: 0000000000000001 R08: 0000000000000007 R09: 0000000000000000 R10: 8000000000000004 R11: fffffffffffdaf60 R12: ffffc9000528f1f0 R13: ffff88805a100c50 R14: ffffc9000528f230 R15: ffff88805a100c28 FS: 00007fa24d4766c0(0000) GS:ffff888123b60000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa24c5eb840 CR3: 000000002131f000 CR4: 00000000003526f0 Call Trace: check_irq_usage+0x32b/0x8b0 kernel/locking/lockdep.c:2832 check_prev_add+0xfe/0xe60 kernel/locking/lockdep.c:3185 check_prevs_add kernel/locking/lockdep.c:3300 [inline] validate_chain kernel/locking/lockdep.c:3924 [inline] __lock_acquire+0x1492/0x1ec0 kernel/locking/lockdep.c:5254 lock_acquire kernel/locking/lockdep.c:5908 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5865 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:155 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:181 debug_object_activate+0x144/0x4b0 lib/debugobjects.c:873 debug_hrtimer_activate kernel/time/hrtimer.c:486 [inline] debug_activate kernel/time/hrtimer.c:529 [inline] remove_and_enqueue_same_base kernel/time/hrtimer.c:1286 [inline] __hrtimer_start_range_ns kernel/time/hrtimer.c:1429 [inline] hrtimer_start_range_ns_common+0x53f/0x18b0 kernel/time/hrtimer.c:1508 hrtimer_start_range_ns+0xc2/0x460 kernel/time/hrtimer.c:1530 hrtimer_start include/linux/hrtimer.h:222 [inline] hrtick_cond_restart kernel/sched/core.c:949 [inline] hrtick_schedule_exit kernel/sched/core.c:1011 [inline] finish_lock_switch kernel/sched/core.c:5250 [inline] finish_task_switch.isra.0+0xa6e/0x10d0 kernel/sched/core.c:5369 context_switch kernel/sched/core.c:5523 [inline] __schedule+0x1261/0x6920 kernel/sched/core.c:7270 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:7592 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:468 [inline] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline] irqentry_exit+0x205/0xa10 kernel/entry/common.c:167 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:lock_acquire+0x5e/0x380 kernel/locking/lockdep.c:5913 Code: 05 4f dd a4 12 83 f8 07 0f 87 da 00 00 00 48 0f a3 05 5e df 5d 0f 0f 82 c9 02 00 00 8b 35 fe 10 5e 0f 85 f6 0f 85 c7 00 00 00 <48> 8b 44 24 30 65 48 2b 05 ed dc a4 12 0f 85 09 03 00 00 48 83 c4 RSP: 0018:ffffc9000528f928 EFLAGS: 00000206 RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8e3c5247 RDI: ffffffff8c620e80 RBP: ffff888033bbe940 R08: 00000000002bb008 R09: ffffffff976b4258 R10: 0000000000000200 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 touch_wq_lockdep_map+0xad/0x1c0 kernel/workqueue.c:4111 __flush_workqueue+0x131/0x1200 kernel/workqueue.c:4153 drain_workqueue+0x175/0x3b0 kernel/workqueue.c:4317 destroy_workqueue+0xc3/0xa30 kernel/workqueue.c:6155 destroy_fs_client+0x170/0x3b0 fs/ceph/super.c:905 ceph_kill_sb+0x2ec/0x9d0 fs/ceph/super.c:1607 deactivate_locked_super+0xbd/0x140 fs/super.c:603 ceph_get_tree+0x1534/0x1fd0 fs/ceph/super.c:1380 vfs_get_tree+0x92/0x320 fs/super.c:1947 vfs_cmd_create+0xd7/0x2a0 fs/fsopen.c:231 vfs_fsconfig_locked fs/fsopen.c:295 [inline] __do_sys_fsconfig+0x55a/0xcb0 fs/fsopen.c:463 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa24c59e159 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:00007fa24d476028 EFLAGS: 00000246 ORIG_RAX: 00000000000001af RAX: ffffffffffffffda RBX: 00007fa24c825fa0 RCX: 00007fa24c59e159 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 RBP: 00007fa24c635024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa24c826038 R14: 00007fa24c825fa0 R15: 00007fff112537d8 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 48 c7 c7 11 26 4e 8e mov $0xffffffff8e4e2611,%rdi 7: e8 6c 13 e9 09 call 0x9e91378 c: 65 ff 0d 8d 90 a5 12 decl %gs:0x12a5908d(%rip) # 0x12a590a0 13: 85 ed test %ebp,%ebp 15: 74 17 je 0x2e 17: 83 fb ff cmp $0xffffffff,%ebx 1a: 0f 84 b0 43 3b ff je 0xff3b43d0 20: 48 8d 3d f1 90 61 0f lea 0xf6190f1(%rip),%rdi # 0xf619118 27: 89 de mov %ebx,%esi * 29: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2e: 5b pop %rbx 2f: 5d pop %rbp 30: c3 ret 31: cc int3 32: cc int3 33: cc int3 34: cc int3 35: 90 nop 36: e8 2d 9e 3f 03 call 0x33f9e68 3b: 85 c0 test %eax,%eax 3d: 74 1d je 0x5c