INFO: rcu detected stall in mrp_join

INFO: rcu detected stall in mrp_join_timer
Status: closed as invalid on 2020/01/09 08:13
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 260d, last: 260d

similar bugs (3):
Kernel	Title	Count	Last	Reported	Patched	Status
linux-4.14	INFO: rcu detected stall in mrp_join_timer	7	97d	262d	0/1	upstream: reported on 2020/01/06 01:00
linux-4.19	INFO: rcu detected stall in mrp_join_timer	26	24d	260d	0/1	upstream: reported on 2020/01/08 08:04
upstream	INFO: rcu detected stall in mrp_join_timer (2)	33	12d	221d	0/17	upstream: reported on 2020/02/16 10:49

Sample crash report:

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=d22/1/0x4000000000000004 softirq=198647/198655 fqs=6 
	(t=10500 jiffies g=268837 q=135)
rcu: rcu_preempt kthread starved for 10487 jiffies! g268837 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29128    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:3385 [inline]
 __schedule+0x934/0x1f90 kernel/sched/core.c:4081
 schedule+0xdc/0x2b0 kernel/sched/core.c:4155
 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1895
 rcu_gp_fqs_loop kernel/rcu/tree.c:1661 [inline]
 rcu_gp_kthread+0x9b2/0x18d0 kernel/rcu/tree.c:1821
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 2671 Comm: syz-executor.4 Not tainted 5.5.0-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: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+0x509/0xc0d 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:1517 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641
 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:__kasan_check_write+0x1/0x20 mm/kasan/common.c:101
Code: 3e ef ff ff cc cc cc cc cc 55 89 f6 31 d2 48 89 e5 48 8b 4d 08 e8 1f 2a 00 00 5d c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 55 <89> f6 ba 01 00 00 00 48 89 e5 48 8b 4d 08 e8 fc 29 00 00 5d c3 66
RSP: 0018:ffffc90000da8c18 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000001 RBX: 1ffff920001b5186 RCX: 0000000000000000
RDX: 00000000ffffffff RSI: 0000000000000004 RDI: ffff8880a34830a0
RBP: ffffc90000da8cb8 R08: 0000000000003375 R09: fffffbfff165ebbc
R10: ffff8880a2978f50 R11: ffff8880a2978640 R12: ffff8880a34830a0
R13: ffff8880a34830a8 R14: ffff8880a34830b0 R15: ffffc90000da8c90
 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_lock+0x37/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:338 [inline]
 mrp_join_timer+0x2b/0x80 net/802/mrp.c:590
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1404
 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:qlink_to_object mm/kasan/quarantine.c:137 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:142 [inline]
RIP: 0010:qlist_free_all+0x39/0x150 mm/kasan/quarantine.c:167
Code: 53 48 83 ec 08 48 8b 37 48 85 f6 0f 84 0d 01 00 00 4d 85 e4 49 89 fe 4d 89 e7 0f 84 8c 00 00 00 49 63 87 34 01 00 00 4c 8b 2e <48> 29 c6 48 83 3d dc 50 e0 07 00 0f 84 f2 00 00 00 9c 58 0f 1f 44
RSP: 0018:ffffc900084b75c8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000282 RCX: ffffea00013a5987
RDX: 0000000000000000 RSI: ffff8880a2dd8000 RDI: 0000000000000007
RBP: ffffc900084b75f8 R08: ffff8880a2978640 R09: fffffbfff165eba8
R10: fffffbfff165eba7 R11: ffffffff8b2f5d3f R12: 0000000000000000
R13: ffff8880a6fdccc0 R14: ffffc900084b7608 R15: ffff8880aa402000
 quarantine_reduce+0x15e/0x1a0 mm/kasan/quarantine.c:260
 __kasan_kmalloc.constprop.0+0xa3/0xe0 mm/kasan/common.c:494
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:521
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc mm/slab.c:3320 [inline]
 kmem_cache_alloc+0x121/0x710 mm/slab.c:3484
 __d_alloc+0x2e/0x8c0 fs/dcache.c:1690
 d_alloc+0x4d/0x280 fs/dcache.c:1769
 d_alloc_parallel+0xf4/0x1c00 fs/dcache.c:2521
 __lookup_slow+0x1ab/0x500 fs/namei.c:1648
 lookup_one_len+0x16d/0x1a0 fs/namei.c:2530
 start_creating+0xc5/0x1d0 fs/debugfs/inode.c:335
 __debugfs_create_file+0x65/0x3f0 fs/debugfs/inode.c:380
 debugfs_create_file+0x5a/0x70 fs/debugfs/inode.c:437
 kvm_create_vm_debugfs arch/x86/kvm/../../../virt/kvm/kvm_main.c:656 [inline]
 kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3544 [inline]
 kvm_dev_ioctl+0x8b4/0x17d0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3571
 vfs_ioctl fs/ioctl.c:47 [inline]
 file_ioctl fs/ioctl.c:545 [inline]
 do_vfs_ioctl+0x977/0x14e0 fs/ioctl.c:732
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:749
 __do_sys_ioctl fs/ioctl.c:756 [inline]
 __se_sys_ioctl fs/ioctl.c:754 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:754
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45af49
Code: ad 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8681e85c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045af49
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8681e866d4
R13: 00000000004c44de R14: 00000000004dadb0 R15: 00000000ffffffff

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Maintainers
ci-upstream-kasan-gce-root	2020/01/08 07:25	upstream	ae608821	6738e0b3	.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