Messages in this thread | | | Subject | Re: INFO: rcu detected stall in sys_keyctl | From | Kris Karas <> | Date | Wed, 4 Mar 2020 03:40:20 -0500 |
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Resending this to all the original CCs per suggestion of Dmitry. I'm not a member of linux-crypto, no idea if it will bounce; in any case, the OOPS I saw does not appear to be crypto related.
Dmitry Vyukov wrote: > syzbot wrote: >> Call Trace: >> <IRQ> >> __dump_stack lib/dump_stack.c:77 [inline] >> dump_stack+0x197/0x210 lib/dump_stack.c:118 >> nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101 >> nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62 >> arch_trigger_cpumask_backtrace+0x14/0x20 >> arch/x86/kernel/apic/hw_nmi.c:38 >> trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] >> rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree_stall.h:254 >> print_cpu_stall kernel/rcu/tree_stall.h:475 [inline] >> check_cpu_stall kernel/rcu/tree_stall.h:549 [inline] >> rcu_pending kernel/rcu/tree.c:3030 [inline] >> rcu_sched_clock_irq.cold+0x51a/0xc37 kernel/rcu/tree.c:2276 >> update_process_times+0x2d/0x70 kernel/time/timer.c:1726 >> tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:171 >> tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1314 >> __run_hrtimer kernel/time/hrtimer.c:1517 [inline] >> __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579 >> hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641 >> local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline] >> smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1144 >> apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 >> </IRQ> >> > +lib/mpi maintainers > > I wonder if this can also be triggered by remote actors (tls, wifi, > usb, etc). >
This looks somewhat similar to an OOPS + rcu stall I reported earlier in reply to Greg KH's announcement of 5.5.7:
rcu: INFO: rcu_sched self-detected stall on CPU rcu: 14-....: (20999 ticks this GP) idle=216/1/0x4000000000000002 softirq=454/454 fqs=5250 (t=21004 jiffies g=-755 q=1327) NMI backtrace for cpu 14 CPU: 14 PID: 520 Comm: pidof Tainted: G D 5.5.7 #1 Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./X470 Taichi, BIOS P3.50 07/18/2019 Call Trace: <IRQ> dump_stack+0x50/0x70 nmi_cpu_backtrace.cold+0x14/0x53 ? lapic_can_unplug_cpu.cold+0x44/0x44 nmi_trigger_cpumask_backtrace+0x7b/0x88 rcu_dump_cpu_stacks+0x7b/0xa9 rcu_sched_clock_irq.cold+0x152/0x39b update_process_times+0x1f/0x50 tick_sched_timer+0x40/0x90 ? tick_sched_do_timer+0x50/0x50 __hrtimer_run_queues+0xdd/0x180 hrtimer_interrupt+0x108/0x230 smp_apic_timer_interrupt+0x53/0xa0 apic_timer_interrupt+0xf/0x20 </IRQ>
I don't have a reproducer for it, either. It showed up in 5.5.7 (but might be from earlier as it reproduces so infrequently).
Kris
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