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Message-ID: <17420.7204.375377.273773@cargo.ozlabs.ibm.com>
Date: Mon, 6 Mar 2006 22:25:24 +1100
From: Paul Mackerras <paulus@samba.org>
To: Andrew Morton <akpm@osdl.org>
Cc: Matthew Grant <grantma@anathoth.gen.nz>, dwmw2@infradead.org,
       linux-kernel@vger.kernel.org
Subject: Re: PROBLEM:  rt_sigsuspend() does not return EINTR on 2.6.16-rc2+
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Andrew Morton writes:

> Matthew Grant <grantma@anathoth.gen.nz> wrote:
> >
> > OK, a major piece of software is broken for mounting removable media. A
> >  kernel upgrade from 2.6.15 SHOULDn't do that.  
> 
> Yes, this is a serious problem and we need to get to the bottom of it.

I have been looking at the equivalent code on powerpc.  This looks to
me like we aren't calling do_signal on the way back out of the system
call to userspace on x86 when the _TIF_RESTORE_SIGMASK thread_info
flag is set.  I had a look at the code in arch/i386/kernel and I can't
see why we wouldn't be getting to do_signal, but x86 assembly is not
my strong point.

The fact that userspace is seeing the -ERESTARTNOHAND return value
from the rt_sigsuspend strongly suggests that we aren't actually
calling do_signal, though.

Paul.

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