syzbot

 sign-in | mailing list | source | docs
🐞 Open [1651]
≡ Subsystems
🐞 Fixed [6000]
🐞 Invalid [14793]
⬇ Missing Backports [135]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

INFO: rcu detected stall in pie_timer (2)

Status: auto-closed as invalid on 2020/01/18 03:16
Subsystems: net
[Documentation on labels]
First crash: 1930d, last: 1927d
▶ ▼ Similar bugs (5)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: rcu detected stall in pie_timer (5) net 2 1164d 1167d 0/28 closed as invalid on 2022/02/08 10:00
upstream INFO: rcu detected stall in pie_timer (4) net 1 1345d 1345d 0/28 auto-closed as invalid on 2021/08/22 00:34
upstream INFO: rcu detected stall in pie_timer net C 19 1931d 1967d 13/28 fixed on 2019/10/15 23:40
upstream INFO: rcu detected stall in pie_timer (3) net 4 1603d 1673d 0/28 auto-closed as invalid on 2020/12/06 09:21
linux-4.19 INFO: rcu detected stall in pie_timer C error 28 870d 1968d 0/1 upstream: reported C repro on 2019/09/09 01:30

Sample crash report:
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=d46/1/0x4000000000000004 softirq=56626/56627 fqs=9 
	(t=10501 jiffies g=92397 q=164)
rcu: rcu_preempt kthread starved for 10484 jiffies! g92397 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29040    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3384 [inline]
 __schedule+0x94f/0x1e70 kernel/sched/core.c:4069
 schedule+0xd9/0x260 kernel/sched/core.c:4136
 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1895
 rcu_gp_fqs_loop kernel/rcu/tree.c:1639 [inline]
 rcu_gp_kthread+0x9b2/0x18d0 kernel/rcu/tree.c:1799
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 0
CPU: 0 PID: 31372 Comm: syz-executor.0 Not tainted 5.4.0-rc3+ #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+0x172/0x1f0 lib/dump_stack.c:113
 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:2795 [inline]
 rcu_sched_clock_irq.cold+0x4fd/0xc12 kernel/rcu/tree.c:2244
 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:1299
 __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:830
RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:95
Code: 25 74 1d 3c 09 41 bc f4 ff ff ff e8 dd 8e e9 ff 48 c7 05 5e 1d 3c 09 00 00 00 00 e9 77 e9 ff ff 90 90 90 90 90 90 90 90 90 55 <48> 89 e5 65 48 8b 04 25 40 fe 01 00 65 8b 15 e4 e8 8e 7e 81 e2 00
RSP: 0018:ffff8880ae809b90 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000102 RBX: 00000000ffffffff RCX: 0000000000000000
RDX: 0000000000000103 RSI: 0000000000000008 RDI: 0000000000000001
RBP: ffff8880ae809c68 R08: 1ffffffff14efd4b R09: fffffbfff14efd4c
R10: fffffbfff14efd4b R11: ffffffff8a77ea5f R12: ffff88804b1dcb40
R13: ffff8880ae824c00 R14: ffff8880ae824c00 R15: ffff8880ae824c00
 pie_timer+0x753/0x830 net/sched/sch_pie.c:454
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x6c3/0x1790 kernel/time/timer.c:1786
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:756 [inline]
RIP: 0010:lock_acquire+0x20b/0x410 kernel/locking/lockdep.c:4490
Code: 94 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 d3 01 00 00 48 83 3d 31 d1 99 07 00 0f 84 53 01 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 65 8b
RSP: 0018:ffff88803a9c7c98 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11e63cc RBX: ffff88803aa423c0 RCX: ffffffff8158f240
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286
RBP: ffff88803a9c7ce0 R08: 1ffffffff14efd38 R09: fffffbfff14efd39
R10: ffff88803aa42c58 R11: ffff88803aa423c0 R12: ffffffff88faaf80
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
 rcu_lock_acquire include/linux/rcupdate.h:208 [inline]
 rcu_read_lock_sched include/linux/rcupdate.h:707 [inline]
 __fd_install+0x4d/0x640 fs/file.c:592
 fd_install+0x4d/0x60 fs/file.c:613
 __do_sys_perf_event_open+0x1e20/0x2b40 kernel/events/core.c:11274
 __se_sys_perf_event_open kernel/events/core.c:10867 [inline]
 __x64_sys_perf_event_open+0xbe/0x150 kernel/events/core.c:10867
 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459a59
Code: fd b7 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f87916c9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459a59
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000002001d000
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f87916ca6d4
R13: 00000000004c6b0c R14: 00000000004dc1d0 R15: 00000000ffffffff

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/10/20 03:06 upstream 998d75510e37 8c88c9c1 .config console log report ci-upstream-kasan-gce-selinux-root
2019/10/16 14:34 linux-next 0e9d28bc6c81 d4ea592f .config console log report ci-upstream-linux-next-kasan-gce-root
* Struck through repros no longer work on HEAD.