Bug 435819

Summary:	gdb crash w/ unknown ptrace event 5
Product:	[Fedora] Fedora	Reporter:	Tom Tromey <tromey>
Component:	gdb	Assignee:	Jan Kratochvil <jan.kratochvil>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	low	Docs Contact:
Priority:	low
Version:	8	CC:	patrickm
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	6.6-45.fc8	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2008-03-16 19:28:39 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Tom Tromey 2008-03-03 23:29:04 UTC

I'm trying to run gdb on gcc, but have it follow-fork
and debug into the cc1 subprocess.  I'm using an up-to-date F8.
Here is the transcript of the session:

gdb --args /home/tromey/incremental/install/bin/gcc -O2 -S
/home/tromey/incremental/trunk/gcc/testsuite/gcc.c-torture/compile/20010404-1.c 

(Note that I'm running in Emacs using a special (local) mode,
which I think adds -fullname --annotate=3, in case that matters)

Current directory is ~/incremental/T/
GNU gdb Red Hat Linux (6.6-43.fc8rh)
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux-gnu"...
Using host libthread_db library "/lib/libthread_db.so.1".
(gdb) set detach-on-fork off
(gdb) set follow-fork-mode child
(gdb) b internal_error
Function "internal_error" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (internal_error) pending.
(gdb) r
Starting program: /home/tromey/incremental/install/bin/gcc -O2 -S
/home/tromey/incremental/trunk/gcc/testsuite/gcc.c-torture/compile/20010404-1.c
[Thread debugging using libthread_db enabled]
../../gdb/linux-nat.c:623: internal-error: unknown ptrace event 5
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) y
../../gdb/linux-nat.c:623: internal-error: unknown ptrace event 5
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Create a core file of GDB? (y or n) n

Debugger exited abnormally with code 1

Comment 1 Jan Kratochvil 2008-03-10 20:28:22 UTC

Reproduced on F8 gdb-6.6-44.fc8.x86_64, it works on Rawhide, to be backported.

Comment 2 Jan Kratochvil 2008-03-13 22:45:13 UTC

Comitted to the F-8 CVS:
* Thu Mar 13 2008 Jan Kratochvil <jan.kratochvil> - 6.6-45
- Backport of follow-fork-mode child fixes (BZ 435819).

Comment 3 Fedora Update System 2008-03-16 13:18:07 UTC

gdb-6.6-45.fc8 has been submitted as an update for Fedora 8

Comment 4 Fedora Update System 2008-03-16 19:28:35 UTC

gdb-6.6-45.fc8 has been pushed to the Fedora 8 stable repository.  If problems still persist, please make note of it in this bug report.