rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=30233, q=64) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294984894-4294974392), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor5 R running task 22184 13085 5628 0x00000100 Call Trace: sched_show_task.cold.87+0x2b6/0x30a kernel/sched/core.c:5300 print_other_cpu_stall.cold.66+0x7dd/0x8bb kernel/rcu/tree.c:1286 check_cpu_stall kernel/rcu/tree.c:1415 [inline] rcu_pending kernel/rcu/tree.c:2961 [inline] rcu_check_callbacks+0xfe5/0x1400 kernel/rcu/tree.c:2506 update_process_times+0x2d/0x70 kernel/time/timer.c:1636 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274 __run_hrtimer kernel/time/hrtimer.c:1398 [inline] __hrtimer_run_queues+0x412/0x10c0 kernel/time/hrtimer.c:1460 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline] smp_apic_timer_interrupt+0x1a1/0x750 arch/x86/kernel/apic/apic.c:1054 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:804 RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:69 [inline] RIP: 0010:write_comp_data+0x22/0x70 kernel/kcov.c:122 Code: 90 90 90 90 90 90 90 90 55 65 4c 8b 04 25 40 ee 01 00 65 8b 05 3f 9e 84 7e a9 00 01 1f 00 48 89 e5 75 51 41 8b 80 d0 12 00 00 <83> f8 03 75 45 49 8b 80 d8 12 00 00 45 8b 80 d4 12 00 00 4c 8b 08 RSP: 0018:ffff88019383fa90 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000002 RBX: 0000000000050000 RCX: ffffffff817db9be RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffff88019383fa90 R08: ffff8801b8b1a600 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10032707f5b R13: 0000000000000000 R14: 0000000000050000 R15: fffffffffffff001 __sanitizer_cov_trace_const_cmp1+0x1a/0x20 kernel/kcov.c:174 seccomp_log kernel/seccomp.c:579 [inline] __seccomp_filter+0xb2e/0xe90 kernel/seccomp.c:767 __secure_computing+0x100/0x370 kernel/seccomp.c:795 syscall_trace_enter+0x4e2/0x1260 arch/x86/entry/common.c:120 do_syscall_64+0x601/0x820 arch/x86/entry/common.c:280 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457679 Code: 1d b4 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1f9eccdcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffff001 RBX: 000000000072bf08 RCX: 0000000000457679 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bf08 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bf0c R13: 00007ffc51fb080f R14: 00007f1f9ecce9c0 R15: 0000000000000000 rcu: rcu_preempt kthread starved for 10502 jiffies! g30233 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 22568 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2830 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3479 schedule+0xfe/0x460 kernel/sched/core.c:3523 schedule_timeout+0x140/0x260 kernel/time/timer.c:1804 rcu_gp_fqs_loop+0x762/0xa80 kernel/rcu/tree.c:1934 rcu_gp_kthread+0x341/0xc70 kernel/rcu/tree.c:2090 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21