INFO: rcu detected stall in mrp_join

INFO: rcu detected stall in mrp_join_timer (2)
Status: upstream: reported on 2020/02/16 10:49
Reported-by: syzbot+67edf33871a80247d3c0@syzkaller.appspotmail.com
First crash: 213d, last: 3d15h

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
linux-4.14	INFO: rcu detected stall in mrp_join_timer	7	52d	217d	0/1	upstream: reported on 2020/01/06 01:00
upstream	INFO: rcu detected stall in mrp_join_timer	1	215d	215d	0/17	closed as invalid on 2020/01/09 08:13
linux-4.19	INFO: rcu detected stall in mrp_join_timer	16	9d21h	215d	0/1	upstream: reported on 2020/01/08 08:04

Sample crash report:

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=da2/1/0x4000000000000000 softirq=78946/78947 fqs=30 
	(t=10501 jiffies g=146109 q=443)
rcu: rcu_preempt kthread starved for 10440 jiffies! g146109 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:
rcu_preempt     R  running task    29080    10      2 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:1887 [inline]
 rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2057
 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: 21630 Comm: syz-executor.1 Not tainted 5.8.0-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+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:3635 [inline]
 rcu_sched_clock_irq.cold+0x5b3/0xccd kernel/rcu/tree.c:2518
 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:1520 [inline]
 __hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646
 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:rb_first+0x42/0x80 lib/rbtree.c:473
Code: 02 00 75 46 48 bb 00 00 00 00 00 fc ff df 48 8b 07 48 85 c0 75 05 eb 1d 48 89 d0 48 8d 78 10 48 89 fa 48 c1 ea 03 80 3c 1a 00 <75> 0f 48 8b 50 10 48 85 d2 75 e3 48 83 c4 08 5b c3 48 89 04 24 e8
RSP: 0018:ffffc90000da8cd8 EFLAGS: 00000246
RAX: ffff8880a21db500 RBX: dffffc0000000000 RCX: ffffffff815b3b40
RDX: 1ffff1101443b6a2 RSI: 0000000000000004 RDI: ffff8880a21db510
RBP: 0000000000000100 R08: 0000000000000001 R09: 0000000000000003
R10: fffff520001b5190 R11: 0000000000000001 R12: ffff8880a7cb0000
R13: ffff8880a7cb00b0 R14: 1ffff920001b51a7 R15: ffff8880ae725600
 mrp_mad_event net/802/mrp.c:570 [inline]
 mrp_join_timer+0x2f/0xc0 net/802/mrp.c:591
 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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:196
Code: 48 89 ef 5d e9 21 b4 3f 00 5d be 03 00 00 00 e9 76 7b 24 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 <65> 48 8b 14 25 00 ff 01 00 65 8b 05 d0 e1 8d 7e a9 00 01 ff 00 48
RSP: 0018:ffffc900081473e8 EFLAGS: 00000246
RAX: 0000000000000002 RBX: 0000000000000010 RCX: ffffffff8363a57a
RDX: 0000000000000010 RSI: ffff8880309f8140 RDI: 0000000000000001
RBP: ffff8880a2b3f480 R08: 0000000000000001 R09: ffffffff8cb06047
R10: 0000000000000010 R11: 0000000000000001 R12: 0000000000000010
R13: 000000000000015f R14: dffffc0000000000 R15: 0000000000000000
 tomoyo_domain_quota_is_ok+0xf8/0x550 security/tomoyo/util.c:1032
 tomoyo_supervisor+0x2d4/0xeb0 security/tomoyo/common.c:2089
 tomoyo_audit_path_number_log security/tomoyo/file.c:235 [inline]
 tomoyo_path_number_perm+0x3ed/0x4d0 security/tomoyo/file.c:734
 tomoyo_path_mknod+0x10d/0x190 security/tomoyo/tomoyo.c:240
 security_path_mknod+0xf9/0x170 security/security.c:1077
 may_o_create fs/namei.c:2919 [inline]
 lookup_open.isra.0+0x431/0x1350 fs/namei.c:3060
 open_last_lookups fs/namei.c:3169 [inline]
 path_openat+0x96d/0x2750 fs/namei.c:3357
 do_filp_open+0x17e/0x3c0 fs/namei.c:3387
 do_sys_openat2+0x16f/0x3b0 fs/open.c:1179
 do_sys_open fs/open.c:1195 [inline]
 __do_sys_openat fs/open.c:1209 [inline]
 __se_sys_openat fs/open.c:1204 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1204
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ccd9
Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f523baf1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000022e80 RCX: 000000000045ccd9
RDX: 0000000000101040 RSI: 0000000020000440 RDI: 00000000ffffff9c
RBP: 000000000078bf48 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffde843ef1f R14: 00007f523baf29c0 R15: 000000000078bf0c

Crashes (20):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci-upstream-kasan-gce-root	2020/08/07 06:28	upstream	47ec5303	1f122f88	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-selinux-root	2020/08/03 07:21	upstream	5a30a789	196277c4	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-selinux-root	2020/07/21 14:45	upstream	4fa640dc	d88894e6	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce	2020/07/13 03:01	upstream	4437dd6e	9ebcc5b1	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce-root	2020/07/03 16:20	upstream	cd77006e	bed10395	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-kasan-gce	2020/05/24 20:44	upstream	caffb99b	bd28eb9d	.config	log	report	bp@alien8.de, hpa@zytor.com, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mbenes@suse.cz, mingo@redhat.com, peterz@infradead.org, shile.zhang@linux.alibaba.com, tglx@linutronix.de, x86@kernel.org
ci-upstream-kasan-gce-root	2020/03/13 12:10	upstream	3cc6e2c5	d850e9d0	.config	log	report	davem@davemloft.net, gregkh@linuxfoundation.org, info@metux.net, keescook@chromium.org, kstewart@linuxfoundation.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pankaj.laxminarayan.bharadiya@intel.com, tglx@linutronix.de
ci-upstream-kasan-gce-root	2020/02/23 19:23	upstream	0a115e5f	2c36e7a7	.config	log	report	davem@davemloft.net, gregkh@linuxfoundation.org, info@metux.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pankaj.laxminarayan.bharadiya@intel.com, tglx@linutronix.de
ci-upstream-kasan-gce	2020/02/12 02:06	upstream	0a679e13	4d1ab643	.config	log	report	davem@davemloft.net, gregkh@linuxfoundation.org, info@metux.net, keescook@chromium.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pankaj.laxminarayan.bharadiya@intel.com, tglx@linutronix.de
ci-upstream-kasan-gce-root	2020/02/08 05:37	upstream	41dcd67e	06150bf1	.config	log	report	davem@davemloft.net, info@metux.net, keescook@chromium.org, kstewart@linuxfoundation.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pankaj.laxminarayan.bharadiya@intel.com, tglx@linutronix.de
ci-upstream-kasan-gce	2020/02/02 01:47	upstream	94f2630b	2274ad39	.config	log	report	allison@lohutok.net, davem@davemloft.net, keescook@chromium.org, kstewart@linuxfoundation.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pankaj.laxminarayan.bharadiya@intel.com, tglx@linutronix.de
ci-upstream-kasan-gce-smack-root	2020/01/31 21:13	upstream	ccaaaf6f	c30117b2	.config	log	report	allison@lohutok.net, davem@davemloft.net, gregkh@linuxfoundation.org, info@metux.net, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pankaj.laxminarayan.bharadiya@intel.com, tglx@linutronix.de
ci-upstream-kasan-gce-selinux-root	2020/01/30 01:33	upstream	b3a60822	5ed23f9a	.config	log	report	allison@lohutok.net, davem@davemloft.net, kstewart@linuxfoundation.org, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pankaj.laxminarayan.bharadiya@intel.com, tglx@linutronix.de
ci-upstream-kasan-gce-root	2020/01/24 05:13	upstream	4703d911	2e95ab33	.config	log	report	allison@lohutok.net, davem@davemloft.net, info@metux.net, kstewart@linuxfoundation.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pankaj.laxminarayan.bharadiya@intel.com, tglx@linutronix.de
ci-upstream-kasan-gce-smack-root	2020/01/19 19:03	upstream	8f8972a3	0342f8c7	.config	log	report	allison@lohutok.net, davem@davemloft.net, keescook@chromium.org, kstewart@linuxfoundation.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pankaj.laxminarayan.bharadiya@intel.com, tglx@linutronix.de
ci-upstream-kasan-gce	2020/01/14 09:13	upstream	b3a987b0	32881205	.config	log	report	davem@davemloft.net, info@metux.net, keescook@chromium.org, kstewart@linuxfoundation.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pankaj.laxminarayan.bharadiya@intel.com, tglx@linutronix.de
ci-upstream-kasan-gce	2020/01/10 06:53	upstream	e69ec487	4de4e9f0	.config	log	report	davem@davemloft.net, gregkh@linuxfoundation.org, keescook@chromium.org, kstewart@linuxfoundation.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, pankaj.laxminarayan.bharadiya@intel.com, tglx@linutronix.de
ci-upstream-kasan-gce-386	2020/07/30 18:19	upstream	d3590ebf	233283a1	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-linux-next-kasan-gce-root	2020/07/22 12:40	linux-next	de2e69cf	128cd85f	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de
ci-upstream-linux-next-kasan-gce-root	2020/07/13 07:44	linux-next	d31958b3	9ebcc5b1	.config	log	report	fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, tglx@linutronix.de