INFO: rcu detected stall in garp_join

INFO: rcu detected stall in garp_join_timer
Status: closed as invalid on 2019/11/29 14:24
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 298d, last: 298d

similar bugs (4):
Kernel	Title	Count	Last	Reported	Patched	Status
linux-4.19	INFO: rcu detected stall in garp_join_timer	7	227d	258d	0/1	auto-closed as invalid on 2020/06/07 13:30
upstream	INFO: rcu detected stall in garp_join_timer (2)	12	26d	219d	0/17	upstream: reported on 2020/02/16 10:50
linux-4.14	INFO: rcu detected stall in garp_join_timer	4	222d	237d	0/1	auto-closed as invalid on 2020/06/12 11:13
linux-4.19	INFO: rcu detected stall in garp_join_timer (2)	1	94d	94d	0/1	upstream: reported on 2020/06/20 11:34

Sample crash report:

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	3-....: (1 GPs behind) idle=d96/1/0x4000000000000004 softirq=34961/34963 fqs=4613 
	(t=10502 jiffies g=35537 q=550)
NMI backtrace for cpu 3
CPU: 3 PID: 29073 Comm: syz-executor.3 Not tainted 5.4.0-syzkaller #0
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014
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
RIP: 0010:garp_join_timer+0x0/0x80 net/802/garp.c:402
Code: e8 45 11 90 01 44 89 ea 4c 89 f6 4c 89 e7 48 89 c3 e8 04 f6 ff ff 48 85 db 75 da e8 ba 3f 8e fb 5b 41 5c 41 5d 41 5e 5d c3 90 <55> 48 89 e5 41 55 41 54 53 48 89 fb e8 9f 3f 8e fb 4c 8d 63 48 4c
RSP: 0018:ffff88807ed09d08 EFLAGS: 00010206 ORIG_RAX: ffffffffffffff13
RAX: ffffffff85e69e70 RBX: ffff88806437de10 RCX: ffffffff81649690
RDX: 0000000000000100 RSI: ffffffff81649220 RDI: ffff88806437de10
RBP: ffff88807ed09dd8 R08: ffff88806a780f80 R09: ffffed100fda7045
R10: ffffed100fda7044 R11: ffff88807ed38223 R12: 0000000000000102
R13: ffff88807ed09db0 R14: 0000000000000000 R15: dffffc0000000000
 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:829
 </IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x4f/0x80 kernel/locking/spinlock.c:199
Code: c0 68 34 13 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 33 48 83 3d 12 6a 96 01 00 74 20 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 e7 ab d3 f9 65 8b 05 18 54 85 78 85 c0 74 06 41
RSP: 0018:ffff8880635577f8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff122668d RBX: ffff88806a780f80 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff88806a781814
RBP: ffff888063557800 R08: ffff88806a780f80 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88807ed37380
R13: ffff88807b5882c0 R14: 0000000000000000 R15: 0000000000000001
 finish_lock_switch kernel/sched/core.c:3124 [inline]
 finish_task_switch+0x147/0x750 kernel/sched/core.c:3224
 context_switch kernel/sched/core.c:3388 [inline]
 __schedule+0x8e9/0x1f30 kernel/sched/core.c:4081
 preempt_schedule_common+0x4f/0xe0 kernel/sched/core.c:4236
 preempt_schedule+0x4b/0x60 kernel/sched/core.c:4261
 ___preempt_schedule+0x16/0x18 arch/x86/entry/thunk_64.S:50
 try_to_wake_up+0xbcc/0x1a80 kernel/sched/core.c:2650
 wake_up_process kernel/sched/core.c:2668 [inline]
 wake_up_q+0xb2/0x140 kernel/sched/core.c:496
 futex_wake+0x429/0x4d0 kernel/futex.c:1696
 do_futex+0x358/0x1de0 kernel/futex.c:3886
 __do_sys_futex kernel/futex.c:3942 [inline]
 __se_sys_futex kernel/futex.c:3910 [inline]
 __x64_sys_futex+0x3f7/0x590 kernel/futex.c:3910
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a759
Code: bd b1 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 8b b1 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7a3a941cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 000000000071bf08 RCX: 000000000045a759
RDX: 00000000004a815c RSI: 0000000000000081 RDI: 000000000071bf0c
RBP: 000000000071bf00 R08: 0000000000000009 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000071bf0c
R13: 00007ffdb9e9442f R14: 00007f7a3a922000 R15: 0000000000000003

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-qemu-upstream	2019/11/29 10:06	upstream	81b6b964	4f7e1d0f	.config	log	report				allison@lohutok.net, davem@davemloft.net, gregkh@linuxfoundation.org, info@metux.net, kstewart@linuxfoundation.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, tglx@linutronix.de