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Bug 1080657 - [RHEL7] Can't access TLS variables in statically linked binaries
Summary: [RHEL7] Can't access TLS variables in statically linked binaries
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: gdb
Version: 7.0
Hardware: x86_64
OS: Linux
unspecified
medium
Target Milestone: rc
: ---
Assignee: Sergio Durigan Junior
QA Contact: Miroslav Franc
URL:
Whiteboard:
Depends On:
Blocks: 1081283
TreeView+ depends on / blocked
 
Reported: 2014-03-25 21:39 UTC by Ben Woodard
Modified: 2016-02-01 02:29 UTC (History)
6 users (show)

Fixed In Version: gdb-7.6.1-56.el7
Doc Type: Bug Fix
Doc Text:
Cause: GDB could not correctly access TLS (Thread Local Storage) data on statically linked binaries. Consequence: The user was not able to inspect TLS data on the program being debugged, if this program was linked statically. Fix: GDB now correctly accesses TLS data on statically linked binaries. Result: The user can now inspect the TLS data on a statically linked binary.
Clone Of: 1080656
Environment:
Last Closed: 2015-03-05 09:23:58 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)
reprocer (656 bytes, text/x-csrc)
2014-03-25 21:39 UTC, Ben Woodard
no flags Details


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:0404 0 normal SHIPPED_LIVE gdb bug fix and enhancement update 2015-03-05 14:17:37 UTC

Description Ben Woodard 2014-03-25 21:39:09 UTC
+++ This bug was initially created as a clone of Bug #1080656 +++

Description of problem:
When you have a statically linked binary you can't access the tls data through gdb

Version-Release number of selected component (if applicable):
All. This problem exists in 6.4, 6.5, rhel7, F20 and even the upstream trunk version GDB

How reproducible:
always everywhere


Steps to Reproduce:
sierra648{jdelsign}82: gcc -g -o tls tls.c -pthread -static
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../lib64/libpthread.a(libpthread.o): In function `sem_open':
(.text+0x764d): warning: the use of `mktemp' is dangerous, better use `mkstemp'
sierra648{jdelsign}83: gdb tls
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
...
Reading symbols from /g/g0/jdelsign/tls...done.
(gdb) b 12
Breakpoint 1 at 0x400511: file tls.c, line 12.
(gdb) run
Starting program: /g/g0/jdelsign/tls 
[Thread debugging using libthread_db enabled]
[New Thread 0x2aaaaacac700 (LWP 6735)]
thread_local_p: & == 00002aaaaacac6c0, . == 00002aaaaacabd1c, * == 1
[Switching to Thread 0x2aaaaacac700 (LWP 6735)]

Breakpoint 1, start_routine (arg=0x1) at tls.c:12
12        return arg;

Actual results:
(gdb) p thread_local_p
Cannot find executable file `/g/g0/jdelsign/tls' in dynamic linker's load module list

Expected results:
It print's the variable

Additional info:

Comment 1 Ben Woodard 2014-03-25 21:39:55 UTC
Created attachment 878703 [details]
reprocer

Comment 3 RHEL Program Management 2014-04-02 05:47:13 UTC
This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

Comment 4 Jan Kratochvil 2014-05-18 20:15:16 UTC
[patch] Fix gdbserver qGetTLSAddr for x86_64 -m32
https://sourceware.org/ml/gdb-patches/2014-04/msg00154.html
Message-ID: <20140410114901.GA16411.net>

[patch] Fix TLS access for -static -pthread
https://sourceware.org/ml/gdb-patches/2014-04/msg00155.html
Message-ID: <20140410115204.GB16411.net>

Comment 9 errata-xmlrpc 2015-03-05 09:23:58 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-0404.html


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