linux-kernel - Re: [PATCH 2/3 v3] x86: entry_64.S: always allocate complete "struct pt

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Message-ID: <54EDFDCB.8000001@redhat.com>
Date:	Wed, 25 Feb 2015 17:52:27 +0100
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	Andrey Wagin <avagin@...il.com>
CC:	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	X86 ML <x86@...nel.org>, Alexei Starovoitov <ast@...mgrid.com>,
	Will Drewry <wad@...omium.org>,
	Kees Cook <keescook@...omium.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3 v3] x86: entry_64.S: always allocate complete "struct
 pt_regs"

On 02/25/2015 01:37 PM, Andrey Wagin wrote:
> Hello Denys,
> 
> My test vm doesn't boot with this patch. Could you help to investigate
> this issue?
> 
> I have attached a kernel config and console log.
> 
> [    2.508252] traps: systemd-cgroups[380] general protection ip:7f68ad096028 sp:7fffba298af8 error:0 in ld-2.18.so[7f68ad07e000+20000][  OK
> [    2.600179] traps: systemd-cgroups[384] general protection ip:7f11b9a9c028 sp:7fff4420f978 error:0 in ld-2.18.so[7f11b9a84000+20000]
> [    2.743790] traps: systemd-cgroups[392] general protection ip:7f7f40a44028 sp:7fffe1c1b8b8 error:0 in ld-2.18.so[7f7f40a2c000+20000]
> [    2.754576] traps: systemd-cgroups[393] general protection ip:7fd1314bd028 sp:7ffff76ecc88 error:0 in ld-2.18.so[7fd1314a5000+20000]
> [    2.765343] traps: systemd-cgroups[396] general protection ip:7ff4537b7028 sp:7fff05902378 error:0 in ld-2.18.so[7ff45379f000+20000]
> [    2.798782] traps: systemd-cgroups[399] general protection ip:7f4d5bc9c028 sp:7fff35cb3a48 error:0 in ld-2.18.so[7f4d5bc84000+20000]

These SEGVs are always at the same location within ld-2.18.so:
(ip - load_address) is always 0x18028.

For Sabrine's case, SEGVing address in ld-2.21.so also the same
all the time: 0x184f8.

Please send me your ld-2.18.so / ld-2.21.so files.
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