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Re: [qemu-s390x] [Qemu-devel] [BUG] I/O thread segfault for QEMU on s390

From: Peter Maydell
Subject: Re: [qemu-s390x] [Qemu-devel] [BUG] I/O thread segfault for QEMU on s390x
Date: Mon, 5 Mar 2018 19:07:29 +0000

On 5 March 2018 at 18:54, Christian Borntraeger <address@hidden> wrote:
> On 03/05/2018 07:45 PM, Farhan Ali wrote:
>>    0x000003ff90752026 <+110>:    svc    175
> sys_rt_sigprocmask. r0 should not be changed by the system call.
>>    0x000003ff90752028 <+112>:    lgr    %r5,%r0
>> => 0x000003ff9075202c <+116>:    lfpc    248(%r5)
> so r5 is zero and it was loaded from r0. r0 was loaded from r3 (which is the 
> 2nd parameter to this
> function). Now this is odd.

...particularly given that the only place we call swapcontext()
the second parameter is always the address of a local variable
and can't be 0...

-- PMM

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