rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-...D } 2681 jiffies s: 4837 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4618 Comm: kworker/1:9 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Workqueue: events pwq_unbound_release_workfn
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:178 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xc/0x60 kernel/kcov.c:212
Code: 89 fb e8 17 00 00 00 48 8b 3d 20 95 9e 0c 48 89 de 5b e9 57 90 50 00 00 00 cc cc 00 00 cc 48 8b 04 24 65 48 8b 0d b4 28 80 7e <65> 8b 15 b5 28 80 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75
RSP: 0018:ffffc900001e0aa0 EFLAGS: 00000046
RAX: ffffffff8404ad48 RBX: ffff888055fa6038 RCX: ffff888076a7bc00
RDX: 0000000000000100 RSI: 0000000000000a7c RDI: 0000000000000000
RBP: 1ffffffff1901e40 R08: ffffffff8e20d96f R09: 1ffffffff1c41b2d
R10: dffffc0000000000 R11: fffffbfff1c41b2e R12: 1ffff1100abf4c07
R13: ffff888055fa6038 R14: ffff888055fa6000 R15: ffff888055fa6010
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c451c92 CR3: 000000005d2bc000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 throtl_peek_queued block/blk-throttle.c:280 [inline]
 throtl_dispatch_tg block/blk-throttle.c:1111 [inline]
 throtl_select_dispatch block/blk-throttle.c:1152 [inline]
 throtl_pending_timer_fn+0xa68/0x1dd0 block/blk-throttle.c:1217
 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x291/0x910 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:preempt_schedule_irq+0xb6/0x160 kernel/sched/core.c:6875
Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 7f bf 01 00 00 00 e8 25 61 1c f7 e8 b0 52 4c f7 fb bf 01 00 00 00 <e8> 25 ba ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f
RSP: 0018:ffffc90005cff9c0 EFLAGS: 00000282
RAX: e071a0fe05c31400 RBX: 0000000000000000 RCX: e071a0fe05c31400
RDX: dffffc0000000000 RSI: ffffffff8a8c18a0 RDI: 0000000000000001
RBP: ffffc90005cffa60 R08: ffffffff90b3326f R09: 1ffffffff216664d
R10: dffffc0000000000 R11: fffffbfff216664e R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000b9ff38
 irqentry_exit+0x63/0x70 kernel/entry/common.c:442
 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696
RIP: 0010:lockdep_unregister_key+0x4e8/0x550 kernel/locking/lockdep.c:6526
Code: 31 ae 90 48 c7 c6 20 ad 64 81 e8 c3 ad 07 00 e8 0e c1 07 00 e9 5c fc ff ff e8 a4 0c cf 08 41 f7 c4 00 02 00 00 74 d1 fb 84 db <75> d0 eb e1 0f 0b eb 88 0f 0b e9 f8 fe ff ff 0f 0b e9 45 ff ff ff
RSP: 0018:ffffc90005cffb20 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: e071a0fe05c31400
RDX: 0000000000000001 RSI: ffffffff8a8c2580 RDI: ffffffff8adf6de0
RBP: ffffc90005cffbf0 R08: ffffffff90ae4377 R09: 1ffffffff215c86e
R10: dffffc0000000000 R11: fffffbfff215c86f R12: 0000000000000206
R13: ffff888054993129 R14: ffffffff90ae3198 R15: 1ffff92000b9ff68
 wq_unregister_lockdep kernel/workqueue.c:3500 [inline]
 pwq_unbound_release_workfn+0x262/0x2b0 kernel/workqueue.c:3738
 process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
 worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
 kthread+0x29d/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
net_ratelimit: 13 callbacks suppressed