>> I fail to see where that is triggered in the kernel.
>>
>> t480s: ~/git/linux/arch/s390/kvm (HEAD losgelöst bei next/master) $ git
>> grep "EINTR"
>> kvm-s390.c: if (exit_reason == -EINTR) {
>> kvm-s390.c: return -EINTR;
>> kvm-s390.c: rc = -EINTR;
>> vsie.c: if (rc == -EINTR) {
>>
>>
>> Can you help me out? Is that documented?
>
> It is related to the kernel patch.
> ksm_madvise->unmerge_ksm_pages has
>
> if (signal_pending(current))
> err = -ERESTARTSYS;
>
>
> entry.S will retranslate ERESTARTSYS into -EINTR.
>
In the end both patches fixes an odd-ball case. Marc had a test running
that in parallel started guests and randomly killing QEMUs with pkill.
The QEMUs did end with
qemu-system-s390x: KVM PV command 0 (KVM_PV_ENABLE) failed: header rc 0 rrc 0
IOCTL rc: -12
instead of
qemu-system-s390x: terminating on signal 15 from pid 26495 (pkill)
