syzbot


INFO: rcu detected stall in schedule_idle

Status: closed as invalid on 2019/12/04 14:04
Subsystems: kernel
[Documentation on labels]
First crash: 1596d, last: 1596d

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 ticks this GP) idle=d26/1/0x4000000000000002 softirq=35659/35659 fqs=0 
	(t=11137 jiffies g=33641 q=120)
NMI backtrace for cpu 1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2827 [inline]
 rcu_sched_clock_irq.cold+0x509/0xc02 kernel/rcu/tree.c:2271
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1310
 __run_hrtimer kernel/time/hrtimer.c:1514 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1576
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1638
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1110 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1135
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:schedule_idle+0x0/0x90 kernel/sched/core.c:4181
Code: 35 53 89 e8 c2 84 f7 f9 e9 18 ff ff ff 4c 89 ef e8 b5 84 f7 f9 eb 8c e8 4e 85 f7 f9 eb d4 66 90 66 2e 0f 1f 84 00 00 00 00 00 <48> b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 54 53 65 48 8b 1c 25
RSP: 0018:ffffc90000d3fdc8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffff8880a9a08340 RCX: ffffffff8151b22f
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8880aeb38020
RBP: ffffc90000d3fe90 R08: 1ffff11015d67004 R09: ffffed1015d67005
R10: ffffed1015d67004 R11: ffff8880aeb38027 R12: dffffc0000000000
R13: ffffffff8a371e00 R14: ffff8880a9a08340 R15: 0000000000000001
 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:361
 start_secondary+0x2f4/0x410 arch/x86/kernel/smpboot.c:264
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/12/03 03:44 upstream 596cf45cbf6e ab342da3 .config console log report ci-upstream-kasan-gce-selinux-root
* Struck through repros no longer work on HEAD.