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

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Message-Id: <20150225211852.428143fb78e921fd6e4d4e9e@linux-foundation.org>
Date:	Wed, 25 Feb 2015 21:18:52 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Denys Vlasenko <vda.linux@...glemail.com>
Cc:	Sabrina Dubroca <sd@...asysnail.net>,
	Andy Lutomirski <luto@...capital.net>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Andrey Wagin <avagin@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	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 Thu, 26 Feb 2015 02:12:57 +0100 Denys Vlasenko <vda.linux@...glemail.com> wrote:

> On Thu, Feb 26, 2015 at 12:34 AM, Sabrina Dubroca <sd@...asysnail.net> wrote:
> > 2015-02-25, 23:40:55 +0100, Sabrina Dubroca wrote:
> >> I can run some userspace programs, but I have no idea what would be
> >> helpful.
> >> I can also try booting a real machine with archlinux/systemd tomorrow.
> >
> > I got a good boot out of kernels that normally fail.  I booted
> > systemd's emergency shell and enabled a few services, in the same
> > order they normally start.  journald started cleanly, but after that,
> > every single command produced a "traps:" output and an "audit:" line.
> >
> > I disabled systemd-journald (chmod -x, because `systemctl disable`
> > didn't really disable it), and now it boots, no "traps:" in the log.
> > If I run it, everything fails again (zsh has traps for simply pressing
> > enter on an empty cmd).
> 
> That's some progress!
> 
> It's strange how one process manages to affect everything else.
> 
> "If I run it, everything fails again". How do you run it? Directly,
> or via systemd services mechanism?
> If you just run it directly, can you try running it under
> "strace -f -tt -oLOG"? Does it have the same effect? What's in the LOG?

I'm hitting this bug as well, bisected to this commit.  On an old
x64_64 box, no vms, paravirt, etc.  Running FC6 userspace (heh).

Quite late in initscripts, binaries start getting segmentation faults
and init gives up.  Seems to only affect /usr/bin/rhgb-client.  There's
one instance where /bin/rm is said to segfault, but I suspect that's
init lying to me.


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