INFO: rcu detected stall in check_preemption_disabled

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: a083db76 Linux 4.19.107
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=109874f9e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=c32f76aaadd644de
dashboard link: https://syzkaller.appspot.com/bug?extid=570c3bbb2b164d60094a
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+570c3b...@syzkaller.appspotmail.com

IPv6: ADDRCONF(NETDEV_UP): bond923: link is not ready
8021q: adding VLAN 0 to HW filter on device bond923
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (1 GPs behind) idle=75e/1/0x4000000000000004 softirq=121623/121629 fqs=32
rcu: (t=10500 jiffies g=175401 q=769)
rcu: rcu_preempt kthread starved for 10409 jiffies! g175401 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt R running task 29152 10 2 0x80000000
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3559
schedule_timeout+0x4d1/0xf20 kernel/time/timer.c:1806
rcu_gp_kthread+0xcee/0x2060 kernel/rcu/tree.c:2202
kthread+0x34a/0x420 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
NMI backtrace for cpu 1
CPU: 1 PID: 10331 Comm: syz-executor.0 Not tainted 4.19.107-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+0x188/0x20d 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+0x170/0x1bb 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+0x634/0xddc kernel/rcu/tree.c:2682
update_process_times+0x2a/0x70 kernel/time/timer.c:1638
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168
tick_sched_timer+0x42/0x130 kernel/time/tick-sched.c:1278
__run_hrtimer kernel/time/hrtimer.c:1401 [inline]
__hrtimer_run_queues+0x2fc/0xd50 kernel/time/hrtimer.c:1463
hrtimer_interrupt+0x312/0x770 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:893
RIP: 0010:check_preemption_disabled+0x4/0x280 lib/smp_processor_id.c:12
Code: e8 61 04 e7 fd 48 8b 7c 24 48 e8 97 b1 47 fe e9 60 ee ff ff e8 0d b2 47 fe e9 af f2 ff ff 90 90 90 90 90 90 90 90 41 57 41 56 <41> 55 49 89 f5 41 54 55 48 89 fd 53 e8 cb ea 11 fe 65 44 8b 25 33
RSP: 0018:ffff8880ae707ce8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: ffff888028ea4000 RBX: 000000000002d040 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff87ab0080 RDI: ffffffff87ab00c0
RBP: dffffc0000000000 R08: ffff888028ea4000 R09: ffffed1015ce4733
R10: ffffed1015ce4732 R11: ffff8880ae723993 R12: ffffffff88b94cc0
R13: 1ffff11015ce0faa R14: 0000000000000000 R15: ffff88803b650118
rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1078 [inline]
rcu_lockdep_current_cpu_online+0xb2/0x1b0 kernel/rcu/tree.c:1068
rcu_read_lock_sched_held+0x92/0x130 kernel/rcu/update.c:115
trace_timer_expire_entry include/trace/events/timer.h:90 [inline]
call_timer_fn+0x65d/0x700 kernel/time/timer.c:1325
expire_timers kernel/time/timer.c:1363 [inline]
__run_timers kernel/time/timer.c:1684 [inline]
__run_timers kernel/time/timer.c:1652 [inline]
run_timer_softirq+0x5d0/0x1540 kernel/time/timer.c:1697
__do_softirq+0x26c/0x93c kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x17b/0x1c0 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:893
</IRQ>
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x50/0x80 kernel/locking/spinlock.c:192
Code: c0 98 56 b2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 31 48 83 3d e1 62 92 01 00 74 25 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 96 a6 26 fa 65 8b 05 ff f9 e1 78 85 c0 74 02 5d
RSP: 0018:ffff888211abf840 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1164ad3 RBX: ffff888028ea4000 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: ffff888028ea487c
RBP: ffff8880ae72c280 R08: ffff888028ea4000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae72c280
R13: ffff88800f5a66c0 R14: 0000000000000000 R15: 0000000000000001
finish_lock_switch kernel/sched/core.c:2576 [inline]
finish_task_switch+0x146/0x780 kernel/sched/core.c:2676
context_switch kernel/sched/core.c:2829 [inline]
__schedule+0x86e/0x1d80 kernel/sched/core.c:3515
preempt_schedule_common+0x4a/0xc0 kernel/sched/core.c:3639
___preempt_schedule+0x16/0x18
validate_nla: 7 callbacks suppressed
netlink: 'syz-executor.2': attribute type 1 has an invalid length.


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.