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Date: Fri, 29 Jun 2018 19:08:02 +0300
From: Vasily Averin <>
To: Solar Designer <>
Subject: Re: 32-bit syscall breakage in -431 kernel with KAISER

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.

could you please drop me your config for 64bit kernel?

Thank you,
	Vasily Averin

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