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SubjectRe: [serial8250_interrupt] RIP: 0010:arch_local_irq_restore+0x2/0x8
On Tue, Nov 21, 2017 at 04:39:14PM +0200, Andy Shevchenko wrote:
>On Tue, 2017-11-21 at 21:31 +0800, Fengguang Wu wrote:
>> On Tue, Nov 21, 2017 at 08:33:57PM +0800, Fengguang Wu wrote:
>> > Hello,
>> >
>> > FYI this happens in mainline kernel 4.14.0-02748-gabc36be.
>> > It shows up since v4.13 .
>>
>> Sorry it actually also shows up in 4.10:
>
>This one means that interrupt storm is occurred. Last time I saw that
>was by the fact of some specific IOAPIC configuration when DMA for UART
>was enabled.
>
>I'm pretty sure that is not the case here. Though, it would be nice to
>see link to the following files:

It's basically a KVM machine. This is adapted from the reproduce
script attached in the first email:

kvm=(
qemu-system-x86_64
-enable-kvm
-cpu IvyBridge
-kernel $kernel
-initrd initrd.img
-m 1536
-smp 2
-device e1000,netdev=net0
-netdev user,id=net0,hostfwd=tcp::23406-:22
-boot order=nc
-no-reboot
-watchdog i6300esb
-watchdog-action debug
-rtc base=localtime
-drive file=disk-vm-ivb41-1G-7-0,media=disk,if=virtio
-drive file=disk-vm-ivb41-1G-7-1,media=disk,if=virtio
-drive file=disk-vm-ivb41-1G-7-2,media=disk,if=virtio
-drive file=disk-vm-ivb41-1G-7-3,media=disk,if=virtio
-drive file=disk-vm-ivb41-1G-7-4,media=disk,if=virtio
-drive file=disk-vm-ivb41-1G-7-5,media=disk,if=virtio
-serial stdio
-display none
-monitor null
)

append=(
ip=::::vm-ivb41-1G-7::dhcp
root=/dev/ram0
user=lkp
job=/job-script
ARCH=x86_64
kconfig=x86_64-allyesdebian
branch=linus/master
commit=abc36be236358162202e86ad88616ff95a755101
BOOT_IMAGE=/pkg/linux/x86_64-allyesdebian/gcc-6/abc36be236358162202e86ad88616ff95a755101/vmlinuz-4.14.0-02748-gabc36be
max_uptime=600
RESULT_ROOT=/result/boot/1/vm-ivb41-1G/debian-x86_64-2016-08-31.cgz/x86_64-allyesdebian/gcc-6/abc36be236358162202e86ad88616ff95a755101/0
result_service=tmpfs
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
net.ifnames=0
printk.devkmsg=on
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
drbd.minor_count=8
systemd.log_level=err
ignore_loglevel
console=tty0
earlyprintk=ttyS0,115200
console=ttyS0,115200
vga=normal
rw
)

Thanks,
Fengguang

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