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Date: Tue, 26 Jun 2018 16:41:44 +0300
From: Vasily Averin <>
To: Solar Designer <>
Subject: Re: 32-bit syscall breakage in -431 kernel with KAISER

On 2018-06-26 13:55, Solar Designer wrote:
> On Tue, Jun 26, 2018 at 01:21:31PM +0300, Vasily Averin wrote:
>> I've compiled 028stab123.1 kernel locally,
>> installed it on my test node and found that it crashes on right on boot,
>> during console init.
> We're not seeing behavior this bad.  For us, only some 32-bit syscalls
> against 64-bit kernel are affected.
> Chris Bopp on owl-users reported that for his rebuild with
> CONFIG_KAISER=n "the host hung at boot".  So maybe you didn't enable
> KAISER in your build?

No, my kernel have CONFIG_KAISER=Y
Seems I have problem with dump/restore registers in some exception(irq?) handler.
I observe EIP=0 suddenly, but correct EIP is placed on stack.

I see some related changes in arch/x86_64/kernel/entry.S and will try to analyze it.

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