INFO: rcu detected stall in __netif_receive_skb_core

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: c10b57a5 Linux 4.14.176
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=115ca3f0100000
kernel config: https://syzkaller.appspot.com/x/.config?x=457897b554d08537
dashboard link: https://syzkaller.appspot.com/bug?extid=0cf0275f3ea4d56cdab2
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+0cf027...@syzkaller.appspotmail.com

kvm: pic: level sensitive irq not supported
INFO: rcu_preempt detected stalls on CPUs/tasks:
(detected by 1, t=10502 jiffies, g=15868, c=15867, q=158)
All QSes seen, last rcu_preempt kthread activity 10502 (4295010529-4295000027), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor.5 R running task 27968 28280 6370 0x0000000c
Call Trace:
<IRQ>
sched_show_task kernel/sched/core.c:5168 [inline]
sched_show_task.cold+0x2e3/0x347 kernel/sched/core.c:5143
print_other_cpu_stall kernel/rcu/tree.c:1501 [inline]
check_cpu_stall kernel/rcu/tree.c:1616 [inline]
__rcu_pending kernel/rcu/tree.c:3390 [inline]
rcu_pending kernel/rcu/tree.c:3452 [inline]
rcu_check_callbacks.cold+0xd3f/0xdaa kernel/rcu/tree.c:2792
update_process_times+0x29/0x60 kernel/time/timer.c:1590
tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165
tick_sched_timer+0x3e/0x120 kernel/time/tick-sched.c:1223
__run_hrtimer kernel/time/hrtimer.c:1223 [inline]
__hrtimer_run_queues+0x25c/0xbb0 kernel/time/hrtimer.c:1287
hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline]
smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100
apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792
RIP: 0010:__netif_receive_skb_core+0x11f8/0x2c00 net/core/dev.c:4386
RSP: 0018:ffff8880aeb07c40 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10
RAX: ffffffff889293f0 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000100 RSI: ffffffff87386c80 RDI: ffff88809416c153
RBP: ffff8880aeb07d80 R08: 0000000000000000 R09: 0000000000022012
R10: ffff8880aeb07d98 R11: ffff88805abd05c0 R12: 0000000000000000
R13: ffff88809416c0c0 R14: 0000000000000001 R15: ffff8880aeb2c690
__netif_receive_skb+0x27/0x1a0 net/core/dev.c:4515
process_backlog+0x214/0x750 net/core/dev.c:5197
napi_poll net/core/dev.c:5598 [inline]
net_rx_action+0x456/0xe90 net/core/dev.c:5664
__do_softirq+0x254/0x9bf kernel/softirq.c:288
invoke_softirq kernel/softirq.c:368 [inline]
irq_exit+0x15b/0x1a0 kernel/softirq.c:409
exiting_irq arch/x86/include/asm/apic.h:648 [inline]
smp_apic_timer_interrupt+0x141/0x5e0 arch/x86/kernel/apic/apic.c:1102
apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792
</IRQ>
RIP: 0010:copy_pte_range mm/memory.c:1102 [inline]
RIP: 0010:copy_pmd_range mm/memory.c:1157 [inline]
RIP: 0010:copy_pud_range mm/memory.c:1191 [inline]
RIP: 0010:copy_p4d_range mm/memory.c:1213 [inline]
RIP: 0010:copy_page_range+0xa4a/0x1d70 mm/memory.c:1275
RSP: 0018:ffff88802659fab0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: 1ffff110150d7c4c RBX: ffffea0002a1af80 RCX: ffffc90005b6a000
RDX: 0000000000040000 RSI: ffffffff8179fbfe RDI: ffff88805760073c
RBP: 0000000000000000 R08: 0000000000002790 R09: ffffffff8a070500
R10: ffff88805abd0ee0 R11: ffff88805abd05c0 R12: dffffc0000000000
R13: ffff8880a86be260 R14: 0000000000000000 R15: 00007f71e644c000
dup_mmap kernel/fork.c:709 [inline]
dup_mm kernel/fork.c:1199 [inline]
copy_mm kernel/fork.c:1254 [inline]
copy_process.part.0+0x4884/0x6a70 kernel/fork.c:1771
copy_process kernel/fork.c:1586 [inline]
_do_fork+0x180/0xc80 kernel/fork.c:2070
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c829
RSP: 002b:00007f71e5733c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00000000004da840 RCX: 000000000045c829
RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000078bf00 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000076 R14: 00000000004c311e R15: 00007f71e57346d4
rcu_preempt kthread starved for 10502 jiffies! g15868 c15867 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
rcu_preempt R running task 29920 8 2 0x80000000
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746
rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404


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[syzbot]

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