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: 467d, last: 79d

similar bugs (5):
Kernel	Title	Count	Last	Reported	Patched	Status
linux-4.19	INFO: rcu detected stall in garp_join_timer	7	437d	468d	0/1	auto-closed as invalid on 2020/06/07 13:30
upstream	INFO: rcu detected stall in garp_join_timer	1	508d	508d	0/22	closed as invalid on 2019/11/29 14:24
linux-4.14	INFO: rcu detected stall in garp_join_timer	4	432d	447d	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	304d	304d	0/1	auto-closed as invalid on 2020/10/18 11:34
linux-4.19	INFO: rcu detected stall in garp_join_timer (3)	1	97d	97d	0/1	upstream: reported on 2021/01/13 13:34

Sample crash report:

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=5fe/1/0x4000000000000000 softirq=79124/79125 fqs=40 
	(t=10501 jiffies g=142501 q=287)
rcu: rcu_preempt kthread starved for 10418 jiffies! g142501 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R  running task     stack:29104 pid:   13 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4327 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5078
 schedule+0xcf/0x270 kernel/sched/core.c:5157
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1878
 rcu_gp_fqs_loop kernel/rcu/tree.c:1940 [inline]
 rcu_gp_kthread+0xbbe/0x1d70 kernel/rcu/tree.c:2113
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
NMI backtrace for cpu 1
CPU: 1 PID: 11531 Comm: syz-executor.2 Not tainted 5.11.0-rc5-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:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x1f4/0x230 kernel/rcu/tree_stall.h:337
 print_cpu_stall kernel/rcu/tree_stall.h:569 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:643 [inline]
 rcu_pending kernel/rcu/tree.c:3751 [inline]
 rcu_sched_clock_irq.cold+0x48e/0xedf kernel/rcu/tree.c:2580
 update_process_times+0x16d/0x200 kernel/time/timer.c:1782
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369
 __run_hrtimer kernel/time/hrtimer.c:1519 [inline]
 __hrtimer_run_queues+0x1c0/0xe40 kernel/time/hrtimer.c:1583
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
 sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x25/0x50 kernel/locking/spinlock.c:191
Code: f8 5d c3 66 90 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 2a 87 5c f8 48 89 ef e8 d2 3b 5d f8 f6 c7 02 75 1a 53 9d <bf> 01 00 00 00 e8 f1 42 51 f8 65 8b 05 da ba 05 77 85 c0 74 0a 5b
RSP: 0018:ffffc90000db0cc8 EFLAGS: 00000246
RAX: 0000000000f062be RBX: 0000000000000246 RCX: ffffffff81584047
RDX: 0000000000000000 RSI: 0000000000000103 RDI: 0000000000000000
RBP: ffff8880816a94b8 R08: 0000000000000001 R09: ffffffff8ed32877
R10: fffffbfff1da650e R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880816a94b8 R14: ffffffff871253f0 R15: 0000000000000000
 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline]
 skb_dequeue+0x125/0x180 net/core/skbuff.c:3058
 garp_queue_xmit net/802/garp.c:258 [inline]
 garp_join_timer+0xc6/0xf0 net/802/garp.c:410
 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417
 expire_timers kernel/time/timer.c:1462 [inline]
 __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731
 __run_timers kernel/time/timer.c:1712 [inline]
 run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744
 __do_softirq+0x2bc/0xa29 kernel/softirq.c:343
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:226 [inline]
 __irq_exit_rcu kernel/softirq.c:420 [inline]
 irq_exit_rcu+0x134/0x200 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199
Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 6e 87 5c f8 48 89 ef e8 16 3c 5d f8 e8 91 59 7c f8 fb bf 01 00 00 00 <e8> 36 43 51 f8 65 8b 05 1f bb 05 77 85 c0 74 02 5d c3 e8 8b 10 04
RSP: 0018:ffffc90016f779e8 EFLAGS: 00000206
RAX: 0000000000000759 RBX: 0000000000000001 RCX: 1ffffffff1a069d1
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001
RBP: ffff8880b9f34c40 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff81788e58 R11: 0000000000000000 R12: ffff8880b9f34c40
R13: ffff88802a9f1bc0 R14: 0000000000000000 R15: ffff88806a5b5340
 finish_lock_switch kernel/sched/core.c:4079 [inline]
 finish_task_switch.isra.0+0x158/0x7e0 kernel/sched/core.c:4196
 context_switch kernel/sched/core.c:4330 [inline]
 __schedule+0x914/0x21a0 kernel/sched/core.c:5078
 preempt_schedule_irq+0x4e/0x90 kernel/sched/core.c:5340
 irqentry_exit_cond_resched kernel/entry/common.c:393 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:385 [inline]
 irqentry_exit+0x7a/0xa0 kernel/entry/common.c:423
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:629
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x1c/0x60 kernel/kcov.c:197
Code: e9 00 fd ff ff 66 0f 1f 84 00 00 00 00 00 65 8b 05 19 34 8f 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b 14 25 00 f0 01 00 <a9> 00 01 ff 00 74 0e 85 c9 74 35 8b 82 cc 14 00 00 85 c0 74 2b 8b
RSP: 0018:ffffc90016f77bf0 EFLAGS: 00000246
RAX: 0000000080000000 RBX: ffff888028efce80 RCX: 0000000000000000
RDX: ffff88806a5b5340 RSI: ffffffff8386fdaf RDI: 0000000000000003
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000002
R10: ffffffff8386fda1 R11: 0000000000000002 R12: ffffc90016f77cc0
R13: ffff88801b923a90 R14: 0000000000000002 R15: 0000000000000002
 tomoyo_check_acl+0x12f/0x450 security/tomoyo/domain.c:175
 tomoyo_path_number_perm+0x32a/0x590 security/tomoyo/file.c:733
 security_file_ioctl+0x50/0xb0 security/security.c:1482
 __do_sys_ioctl fs/ioctl.c:747 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0xb3/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f10e3784c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219
RDX: 0000000020052500 RSI: 0000000081f8943c RDI: 0000000000000006
RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00000000016afb5f R14: 00007f10e37859c0 R15: 000000000119bf8c

Crashes (14):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci-upstream-kasan-gce	2021/02/01 00:09	upstream	6642d600	fc9fd31e	.config	log	report	info	INFO: rcu detected stall in garp_join_timer
ci-upstream-kasan-gce	2020/11/22 15:45	upstream	a349e4c6	0d27f508	.config	log	report	info
ci-upstream-kasan-gce	2020/08/27 13:58	upstream	15bc20c6	816e0689	.config	log	report
ci-upstream-kasan-gce-root	2020/08/25 19:12	upstream	6a9dc5fd	344da168	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/08/24 09:07	upstream	cb957121	cef5ae68	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/08/01 23:20	upstream	7dc6fd0f	d895b3be	.config	log	report
ci-upstream-kasan-gce-selinux-root	2020/07/29 08:52	upstream	6ba1b005	cb93dc6a	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/06/08 09:42	upstream	7ae77150	7751efd0	.config	log	report
ci-upstream-kasan-gce	2020/04/16 16:08	upstream	00086336	c743fcb3	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/02/04 20:01	upstream	322bf2d3	93e5e335	.config	log	report
ci-upstream-kasan-gce-root	2020/02/04 17:53	upstream	322bf2d3	93e5e335	.config	log	report
ci-upstream-kasan-gce-386	2020/07/12 01:22	upstream	a581387e	18d18b59	.config	log	report
ci-upstream-kasan-gce-386	2020/01/09 16:05	upstream	b07f636f	ddc3e859	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/06/30 09:17	linux-next	36e3135d	a2cdad9d	.config	log	report