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
