INFO: rcu detected stall in garp_join

INFO: rcu detected stall in garp_join_timer (2)
Status: upstream: reported on 2020/02/16 10:50
Reported-by: syzbot+3fb2b230a1134a93a964@syzkaller.appspotmail.com
First crash: 288d, last: 57d

similar bugs (4):
Kernel	Title	Count	Last	Reported	Patched	Status
linux-4.19	INFO: rcu detected stall in garp_join_timer	7	258d	289d	0/1	auto-closed as invalid on 2020/06/07 13:30
upstream	INFO: rcu detected stall in garp_join_timer	1	329d	329d	0/17	closed as invalid on 2019/11/29 14:24
linux-4.14	INFO: rcu detected stall in garp_join_timer	4	253d	268d	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	125d	125d	0/1	auto-closed as invalid on 2020/10/18 11:34

Sample crash report:

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=ca6/1/0x4000000000000000 softirq=90409/90409 fqs=1 
	(t=10500 jiffies g=169025 q=48)
rcu: rcu_preempt kthread starved for 10498 jiffies! g169025 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:29160 pid:   10 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3778 [inline]
 __schedule+0x8e5/0x21e0 kernel/sched/core.c:4527
 schedule+0xd0/0x2a0 kernel/sched/core.c:4602
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1879
 rcu_gp_fqs_loop kernel/rcu/tree.c:1888 [inline]
 rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2058
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
NMI backtrace for cpu 1
CPU: 1 PID: 24658 Comm: syz-executor.0 Not tainted 5.9.0-rc2-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+0x18f/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x194/0x1cf kernel/rcu/tree_stall.h:318
 print_cpu_stall kernel/rcu/tree_stall.h:551 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:625 [inline]
 rcu_pending kernel/rcu/tree.c:3637 [inline]
 rcu_sched_clock_irq.cold+0x5b3/0xccd kernel/rcu/tree.c:2519
 update_process_times+0x25/0xa0 kernel/time/timer.c:1710
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 sysvec_apic_timer_interrupt+0x4c/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline]
RIP: 0010:lock_acquire+0x27b/0xad0 kernel/locking/lockdep.c:5008
Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 f8 06 00 00 48 83 3d aa ce 5b 08 00 0f 84 a6 05 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 10 48 c7
RSP: 0018:ffffc90000da8be0 EFLAGS: 00000286
RAX: 1ffffffff136c779 RBX: ffff888053890400 RCX: ffffffff815a14fb
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c5f3aaf
R10: fffffbfff18be755 R11: 0000000000000001 R12: 0000000000000000
R13: ffff888042d07078 R14: 0000000000000000 R15: ffff888053890400
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:354 [inline]
 garp_join_timer+0x20/0xf0 net/802/garp.c:405
 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413
 expire_timers kernel/time/timer.c:1458 [inline]
 __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755
 __run_timers kernel/time/timer.c:1736 [inline]
 run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768
 __do_softirq+0x2de/0xa24 kernel/softirq.c:298
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:393 [inline]
 __irq_exit_rcu kernel/softirq.c:423 [inline]
 irq_exit_rcu+0x1f3/0x230 kernel/softirq.c:435
 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581
RIP: 0010:mm_update_next_owner+0x341/0x7a0 kernel/exit.c:378
Code: f8 04 00 00 4c 89 f0 48 c1 e8 03 80 3c 18 00 0f 85 5a 04 00 00 48 8b 85 f8 04 00 00 48 8d a8 f8 fa ff ff 49 39 c6 75 32 eb 6c <e8> 8a c7 2d 00 48 8d bd 08 05 00 00 48 89 f8 48 c1 e8 03 80 3c 18
RSP: 0018:ffffc90020a37b08 EFLAGS: 00000202
RAX: 1ffff1103d0dfcbd RBX: dffffc0000000000 RCX: ffffffff815b5ddb
RDX: ffff888053890400 RSI: ffffffff814677b6 RDI: ffff8881e901e8c8
RBP: ffff8881e86fe1c0 R08: 0000000000000001 R09: ffffffff89a09083
R10: fffffbfff1341210 R11: 0000000000000000 R12: ffff8880a87c7580
R13: ffff8881e86fe5e8 R14: ffff8880545667b8 R15: ffff888053890400
 exit_mm kernel/exit.c:482 [inline]
 do_exit+0xa83/0x29f0 kernel/exit.c:793
 do_group_exit+0x125/0x310 kernel/exit.c:903
 get_signal+0x428/0x1f00 kernel/signal.c:2757
 arch_do_signal+0x82/0x2520 arch/x86/kernel/signal.c:811
 exit_to_user_mode_loop kernel/entry/common.c:136 [inline]
 exit_to_user_mode_prepare+0x15d/0x1c0 kernel/entry/common.c:167
 syscall_exit_to_user_mode+0x59/0x2b0 kernel/entry/common.c:242
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d5b9
Code: Bad RIP value.
RSP: 002b:00007fee29929cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 000000000118cf48 RCX: 000000000045d5b9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000118cf48
RBP: 000000000118cf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 000000000169fb6f R14: 00007fee2992a9c0 R15: 000000000118cf4c

Crashes (12):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci-upstream-kasan-gce	2020/08/27 13:58	upstream	15bc20c6	816e0689	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-root	2020/08/25 19:12	upstream	6a9dc5fd	344da168	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-smack-root	2020/08/24 09:07	upstream	cb957121	cef5ae68	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-smack-root	2020/08/01 23:20	upstream	7dc6fd0f	d895b3be	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-selinux-root	2020/07/29 08:52	upstream	6ba1b005	cb93dc6a	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-smack-root	2020/06/08 09:42	upstream	7ae77150	7751efd0	.config	log	report	allison@lohutok.net, davem@davemloft.net, gregkh@linuxfoundation.org, info@metux.net, kstewart@linuxfoundation.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce	2020/04/16 16:08	upstream	00086336	c743fcb3	.config	log	report	allison@lohutok.net, davem@davemloft.net, gregkh@linuxfoundation.org, info@metux.net, kstewart@linuxfoundation.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-smack-root	2020/02/04 20:01	upstream	322bf2d3	93e5e335	.config	log	report	allison@lohutok.net, davem@davemloft.net, gregkh@linuxfoundation.org, info@metux.net, kstewart@linuxfoundation.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-root	2020/02/04 17:53	upstream	322bf2d3	93e5e335	.config	log	report	allison@lohutok.net, davem@davemloft.net, gregkh@linuxfoundation.org, info@metux.net, kstewart@linuxfoundation.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-386	2020/07/12 01:22	upstream	a581387e	18d18b59	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-386	2020/01/09 16:05	upstream	b07f636f	ddc3e859	.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
ci-upstream-linux-next-kasan-gce-root	2020/06/30 09:17	linux-next	36e3135d	a2cdad9d	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de