linux-kernel - Re: [PATCH] Print which shared library/executable faulted in segfault etc. messages v3

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Message-ID: <Pine.LNX.4.64.0801171948280.9008@fbirervta.pbzchgretzou.qr>
Date:	Thu, 17 Jan 2008 19:52:34 +0100 (CET)
From:	Jan Engelhardt <jengelh@...putergmbh.de>
To:	Andi Kleen <ak@...e.de>
cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de
Subject: Re: [PATCH] Print which shared library/executable faulted in segfault
 etc. messages v3

On Jan 17 2008 00:15, Andi Kleen wrote:
>
>The previously posted version was missing all the 64bit hunks. Fix
>that. Please use over previous version.
>
>They now look like
>
>hal-resmgr[13791]: segfault at 3c rip 2b9c8caec182 rsp 7fff1e825d30
>error 4 in libacl.so.1.1.0[2b9c8caea000+6000]

Can this also be done for executables?

>This makes it easier to pinpoint bugs to specific libraries.

[But it may very well mean improper usage (e.g. passing NULL where
NULL is definitely not expected) on behalf of the library user ;-)]

>And printing the offset into a mapping also always allows to find
>the correct fault point in a library even with randomized mappings.
>Previously there was no way to actually find the correct code
>address inside the randomized mapping.

Previously, one had to ptrace the process, wait for the crash to
happen, then inspect /proc/XXX/maps and calculate the address. It's
not like developers were left in the dark with random mappings.

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