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

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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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