INFO: rcu detected stall in mrp_join

INFO: rcu detected stall in mrp_join_timer
Status: upstream: reported on 2020/01/08 08:04
Reported-by: syzbot+52543f85839e0c2e22ae@syzkaller.appspotmail.com
First crash: 286d, last: 50d

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
linux-4.14	INFO: rcu detected stall in mrp_join_timer	7	123d	288d	0/1	auto-closed as invalid on 2020/10/17 01:22
upstream	INFO: rcu detected stall in mrp_join_timer	1	286d	285d	0/17	closed as invalid on 2020/01/09 08:13
upstream	INFO: rcu detected stall in mrp_join_timer (2)	34	7d12h	247d	0/17	upstream: reported on 2020/02/16 10:49

Sample crash report:

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (10499 ticks this GP) idle=61e/1/0x4000000000000004 softirq=112679/112680 fqs=2 
rcu: 	 (t=10501 jiffies g=141409 q=86)
rcu: rcu_preempt kthread starved for 10498 jiffies! g141409 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    29208    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 schedule_timeout+0x4cf/0xfe0 kernel/time/timer.c:1825
 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
NMI backtrace for cpu 1
CPU: 1 PID: 7683 Comm: syz-executor.5 Not tainted 4.19.142-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+0x1fc/0x2fe lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15f/0x19c kernel/rcu/tree.c:1340
 print_cpu_stall kernel/rcu/tree.c:1478 [inline]
 check_cpu_stall kernel/rcu/tree.c:1550 [inline]
 __rcu_pending kernel/rcu/tree.c:3293 [inline]
 rcu_pending kernel/rcu/tree.c:3336 [inline]
 rcu_check_callbacks.cold+0x62d/0xe19 kernel/rcu/tree.c:2682
 update_process_times+0x2a/0xb0 kernel/time/timer.c:1650
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168
 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278
 __run_hrtimer kernel/time/hrtimer.c:1401 [inline]
 __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1463
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1521
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
 smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1092
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:184
Code: 48 c7 c0 48 5b d2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 2f 48 83 3d dc d0 94 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb b2 e8 7a d4 c2 f9 eb c0 0f 0b 0f 0b 48 c7 c7 48
RSP: 0018:ffff8880ae707ca0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a4b69 RBX: 0000000000000282 RCX: 1ffff11041598d5a
RDX: dffffc0000000000 RSI: ffff88820acc6ab0 RDI: 0000000000000282
RBP: ffff888022080870 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88800f8bd980
R13: ffff888022080870 R14: ffff888022080858 R15: 0000000000000000
 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline]
 skb_dequeue+0x120/0x170 net/core/skbuff.c:2821
 mrp_queue_xmit net/802/mrp.c:353 [inline]
 mrp_join_timer+0x97/0xc0 net/802/mrp.c:598
 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338
 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375
 __run_timers kernel/time/timer.c:1703 [inline]
 run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1716
 __do_softirq+0x26c/0x9a0 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x215/0x260 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:544 [inline]
 smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1094
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
 </IRQ>
RIP: 0010:d_flags_for_inode+0x227/0x2a0 fs/dcache.c:1823
Code: 90 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 20 49 8d 7c 24 08 48 89 fa 48 c1 ea 03 80 3c 02 00 75 69 49 83 7c 24 08 00 <75> 34 e8 a2 47 ba ff 41 83 cd 04 66 44 89 6b 02 e9 73 fe ff ff e8
RSP: 0018:ffff888205f5fcb8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: ffff88807fe290b0 RCX: ffffc900107b6000
RDX: 1ffffffff10544c9 RSI: ffffffff81af6992 RDI: ffffffff882a2648
RBP: 000000000000c000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000003 R11: 00000000ba212a69 R12: ffffffff882a2640
R13: 0000000000000008 R14: ffffffff882a2a60 R15: ffff88821b78c5c0
 __d_instantiate+0x21/0x3c0 fs/dcache.c:1841
 d_instantiate+0x6d/0x90 fs/dcache.c:1874
 alloc_file_pseudo+0x151/0x250 fs/file_table.c:230
 sock_alloc_file+0x48/0x180 net/socket.c:394
 __sys_socketpair+0x2fb/0x570 net/socket.c:1428
 __do_sys_socketpair net/socket.c:1457 [inline]
 __se_sys_socketpair net/socket.c:1454 [inline]
 __x64_sys_socketpair+0x93/0xf0 net/socket.c:1454
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45d5b9
Code: 5d 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007efde09f4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000035
RAX: ffffffffffffffda RBX: 0000000000033900 RCX: 000000000045d5b9
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 000000000000001e
RBP: 000000000118d028 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000180 R11: 0000000000000246 R12: 000000000118cfec
R13: 00007ffea64333cf R14: 00007efde09f59c0 R15: 000000000118cfec
nla_parse: 21 callbacks suppressed
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.4'.

Crashes (26):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci2-linux-4-19	2020/08/30 23:23	linux-4.19.y	f6d5cb9e	d5a3ae1f	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/08/27 18:34	linux-4.19.y	f6d5cb9e	816e0689	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/08/25 19:10	linux-4.19.y	d18b78ab	344da168	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/08/25 04:41	linux-4.19.y	d18b78ab	344da168	.config	log	report	bp@alien8.de, gregkh@linuxfoundation.org, hpa@zytor.com, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mbenes@suse.cz, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, x86@kernel.org
ci2-linux-4-19	2020/08/20 12:49	linux-4.19.y	a834132b	ed282a3a	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/08/16 01:42	linux-4.19.y	c14d30dc	5ce13532	.config	log	report	linux-kernel@vger.kernel.org, mingo@elte.hu, peterz@infradead.org, rostedt@goodmis.org
ci2-linux-4-19	2020/08/15 18:43	linux-4.19.y	c14d30dc	5ce13532	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/08/14 10:39	linux-4.19.y	c14d30dc	54ce1ed6	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/08/13 13:09	linux-4.19.y	c14d30dc	ee7cb8b6	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/08/13 04:36	linux-4.19.y	c14d30dc	bc15f7db	.config	log	report	bp@alien8.de, hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@redhat.com, tglx@linutronix.de, x86@kernel.org
ci2-linux-4-19	2020/08/01 01:16	linux-4.19.y	13af6c74	8df85ed9	.config	log	report	bp@alien8.de, gregkh@linuxfoundation.org, hpa@zytor.com, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mbenes@suse.cz, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, x86@kernel.org
ci2-linux-4-19	2020/07/14 14:21	linux-4.19.y	dce0f886	6f458026	.config	log	report	bp@alien8.de, gregkh@linuxfoundation.org, hpa@zytor.com, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mbenes@suse.cz, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, x86@kernel.org
ci2-linux-4-19	2020/07/10 17:16	linux-4.19.y	dce0f886	56d01184	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/07/02 15:19	linux-4.19.y	399849e4	f30c14bf	.config	log	report	linux-kernel@vger.kernel.org, mingo@elte.hu, peterz@infradead.org, rostedt@goodmis.org
ci2-linux-4-19	2020/06/14 04:07	linux-4.19.y	3fc89857	a61674a5	.config	log	report	bp@alien8.de, gregkh@linuxfoundation.org, hpa@zytor.com, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mbenes@suse.cz, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, x86@kernel.org
ci2-linux-4-19	2020/06/12 12:47	linux-4.19.y	3fc89857	819b58b0	.config	log	report	bp@alien8.de, gregkh@linuxfoundation.org, hpa@zytor.com, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mbenes@suse.cz, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, x86@kernel.org
ci2-linux-4-19	2020/06/01 19:35	linux-4.19.y	2d16cf48	a0331e89	.config	log	report	bp@alien8.de, gregkh@linuxfoundation.org, hpa@zytor.com, jpoimboe@redhat.com, linux-kernel@vger.kernel.org, mbenes@suse.cz, mingo@redhat.com, peterz@infradead.org, tglx@linutronix.de, x86@kernel.org
ci2-linux-4-19	2020/05/15 11:12	linux-4.19.y	258f0cf7	2d572622	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/04/30 00:10	linux-4.19.y	76567537	2dd552a5	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/04/26 00:08	linux-4.19.y	7edd66cf	b8bb8e5f	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/04/19 17:03	linux-4.19.y	8488c3f3	6dfd45e1	.config	log	report	linux-kernel@vger.kernel.org, mingo@elte.hu, peterz@infradead.org, rostedt@goodmis.org
ci2-linux-4-19	2020/03/03 10:15	linux-4.19.y	a083db76	350a7a26	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/02/09 19:03	linux-4.19.y	b499cf4b	6ece2ea5	.config	log	report	linux-kernel@vger.kernel.org, mingo@elte.hu, peterz@infradead.org, rostedt@goodmis.org
ci2-linux-4-19	2020/02/06 01:03	linux-4.19.y	b499cf4b	662cf49a	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/02/04 23:32	linux-4.19.y	32ee7492	93e5e335	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci2-linux-4-19	2020/01/08 08:03	linux-4.19.y	3d40d711	6738e0b3	.config	log	report	davem@davemloft.net, linux-kernel@vger.kernel.org, netdev@vger.kernel.org