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Date: Fri, 29 Jun 2018 18:41:24 +0200
From: Solar Designer <>
To: Vasily Averin <>
Subject: Re: 32-bit syscall breakage in -431 kernel with KAISER


On Fri, Jun 29, 2018 at 07:08:02PM +0300, Vasily Averin wrote:
> On 06/28/2018 05:11 PM, Vasily Averin wrote:
> > On my test node I observe strange exception right on boot of 64-bit kernel, 
> > it is not handles properly and writes 0 into EIP and it crashes the kernel.
> > 
> > So I'm going to troubloeshoot qemu with gdb, hope it helps tofind the resoun of the trouble.
> I have stable reproducer, but even with single-step and hardware breakpoints I still cannot intercept this mysterious exception.
> it adds an extra frame on regular stack, changes EIP to 0, then generates page_fault an crashes.
> Alexander,
> could you please drop me your config for 64bit kernel?

You can get our kernel configs here:

Meanwhile, Chris who reported the problem on owl-users has confirmed
that Pavel's fix works for him.


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