Re: [serial8250_interrupt] RIP: 0010:arch_local_irq_restore+0x2/0x8

[Fengguang Wu]

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