rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (1 GPs behind) idle=892/1/0x4000000000000002 softirq=12062/12071 fqs=40 (t=10501 jiffies g=6753 q=485) rcu: rcu_preempt kthread starved for 10422 jiffies! g6753 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29032 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x9a0/0xcc0 kernel/sched/core.c:4081 schedule+0x181/0x210 kernel/sched/core.c:4155 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1895 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline] rcu_gp_kthread+0xed8/0x1770 kernel/rcu/tree.c:1821 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 8363 Comm: syz-executor.0 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x15a/0x220 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline] check_cpu_stall kernel/rcu/tree_stall.h:529 [inline] rcu_pending kernel/rcu/tree.c:2827 [inline] rcu_sched_clock_irq+0xe25/0x1ad0 kernel/rcu/tree.c:2271 update_process_times+0x12d/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1310 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x403/0x840 kernel/time/hrtimer.c:1576 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1638 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1135 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:check_kcov_mode kernel/kcov.c:79 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x22/0x50 kernel/kcov.c:102 Code: 64 02 3b 00 5b 5d c3 cc 48 8b 04 24 65 48 8b 0c 25 c0 1d 02 00 65 8b 15 b8 81 8b 7e f7 c2 00 01 1f 00 75 2c 8b 91 80 13 00 00 <83> fa 02 75 21 48 8b 91 88 13 00 00 48 8b 32 48 8d 7e 01 8b 89 84 RSP: 0018:ffffc900022675e0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffff81487433 RBX: 0000000000000000 RCX: ffff8880a3b46040 RDX: 0000000000000002 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc90002267608 R08: dffffc0000000000 R09: fffffbfff120248a R10: fffffbfff120248a R11: 0000000000000000 R12: dffffc0000000000 R13: dffffc0000000000 R14: 00000000fffffffc R15: ffff8880a96cda28 free_thread_stack+0x168/0x590 kernel/fork.c:280 release_task_stack kernel/fork.c:440 [inline] put_task_stack+0xa3/0x130 kernel/fork.c:451 finish_task_switch+0x3f1/0x550 kernel/sched/core.c:3256 context_switch kernel/sched/core.c:3388 [inline] __schedule+0x9a8/0xcc0 kernel/sched/core.c:4081 preempt_schedule_irq+0xc1/0x140 kernel/sched/core.c:4338 retint_kernel+0x1b/0x2b RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:__text_poke+0x91d/0xb40 arch/x86/kernel/alternative.c:888 Code: 48 c1 e8 03 42 80 3c 28 00 74 0c 48 c7 c7 28 96 0a 89 e8 e6 9e 86 00 48 83 3d 06 22 df 07 00 0f 84 26 02 00 00 48 89 df 57 9d <0f> 1f 44 00 00 65 48 8b 04 25 28 00 00 00 48 3b 45 d0 0f 85 df 01 RSP: 0018:ffffc90002267860 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: 1ffffffff12152c5 RBX: 0000000000000286 RCX: ffffffff815c0597 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: ffffc900022678e8 R08: ffff8880a3b46898 R09: fffffbfff13c8d1d R10: fffffbfff13c8d1d R11: 0000000000000000 R12: ffff88821bbaa040 R13: dffffc0000000000 R14: ffffffff815bba3d R15: 00002aaaaaaab000 text_poke arch/x86/kernel/alternative.c:912 [inline] text_poke_bp_batch+0x143/0x470 arch/x86/kernel/alternative.c:1068 arch_jump_label_transform_apply+0x2d/0x50 arch/x86/kernel/jump_label.c:164 __jump_label_update+0x371/0x390 kernel/jump_label.c:449 jump_label_update+0x38e/0x410 kernel/jump_label.c:808 static_key_slow_inc_cpuslocked+0x15a/0x220 kernel/jump_label.c:144 static_key_slow_inc+0x1a/0x30 kernel/jump_label.c:159 tracepoint_add_func kernel/tracepoint.c:255 [inline] tracepoint_probe_register_prio+0x4b7/0x590 kernel/tracepoint.c:315 tracepoint_probe_register+0x2a/0x40 kernel/tracepoint.c:335 trace_event_reg+0x1b5/0x260 kernel/trace/trace_events.c:299 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x476/0x900 kernel/trace/trace_event_perf.c:204 perf_trace_init+0x1de/0x220 kernel/trace/trace_event_perf.c:228 perf_tp_event_init+0x8b/0x110 kernel/events/core.c:9011 perf_try_init_event+0x14e/0x3c0 kernel/events/core.c:10462 perf_init_event kernel/events/core.c:10514 [inline] perf_event_alloc+0x1022/0x27b0 kernel/events/core.c:10794 __do_sys_perf_event_open kernel/events/core.c:11277 [inline] __se_sys_perf_event_open+0x6e3/0x41c0 kernel/events/core.c:11151 __x64_sys_perf_event_open+0xbf/0xd0 kernel/events/core.c:11151 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a679 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f705a2abc78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045a679 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000002025c000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f705a2ac6d4 R13: 00000000004c84be R14: 00000000004df8d8 R15: 00000000ffffffff