linux-kernel - Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit signal context

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Date:	Sun, 18 Oct 2015 19:29:03 +0300
From:	Stas Sergeev <stsp@...t.ru>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Denys Vlasenko <dvlasenk@...hat.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Borislav Petkov <bp@...en8.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Brian Gerst <brgerst@...il.com>, X86 ML <x86@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [RFC 3/4] x86/signal/64: Re-add support for SS in the 64-bit
 signal context

18.10.2015 19:12, Andy Lutomirski пишет:
> On Sun, Oct 18, 2015 at 6:36 AM, Stas Sergeev <stsp@...t.ru> wrote:
>> 15.10.2015 00:41, Andy Lutomirski пишет:
>>>> If this my
>>>> understanding is correct and the flag is just an indication rather
>>>> than a requested action, perhaps the name should be different,
>>>> e.g. UC_SIG_FROM_32BIT or the like?
>>>> Anyway, this is minor. :)
>>>> I'll try to test the patch within a few days, thanks for you time!
>>> No problem.  Thanks for being willing to test!
>> Hello Andy, I am unlucky at testing this.
>> dosemu doesn't even start for me on the git kernels.
>> After a half day of debugging, it seems the kernel forgets
>> to fill in the "err" field in the sigcontext struct when
>> page fault occurs. That confuses the dosemu's instruction
>> decoder.
>> Does this ring any bells?
> No, but I can reproduce it on some kernels.  Let me see if I can fix it, too.
Thanks!
You should really consider adding dosemu as your test-case.
It feels very unhappy on all recent kernels. I was getting hard
lock-ups under different circumstances (when starting windows,
for example). But fedora-packaged kernels are quite good, as of
yet. I fear the problems will soon populate to them too.
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