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gdb/2303: Gdb 6.6 hangs while loading/unloading shared library with SIGTRAP signal on Solaris 8

From: rohit_jain at mentor dot com
To: gdb-gnats at sources dot redhat dot com
Date: 23 Aug 2007 18:17:17 -0000
Subject: gdb/2303: Gdb 6.6 hangs while loading/unloading shared library with SIGTRAP signal on Solaris 8
Reply-to: rohit_jain at mentor dot com

>Number:         2303
>Category:       gdb
>Synopsis:       Gdb 6.6 hangs while loading/unloading shared library with SIGTRAP signal on Solaris 8
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Aug 23 18:18:01 UTC 2007
>Closed-Date:
>Last-Modified:
>Originator:     rohit_jain@mentor.com
>Release:        GDB 6.6 - SunOS 5.8
>Organization:
>Environment:
Machine: 5.8 Generic_108528-24 sun4u sparc SUNW,Sun-Blade-1000

GCC:
Reading specs from /usr/local/lib/gcc-lib/sparc-sun-solaris2.8/3.2.2/specs
Configured with: ../configure --disable-nls --with-ld=/usr/ccs/bin/ld --with-as=/usr/ccs/bin/as
Thread model: posix
gcc version 3.2.2

GDB: GNU gdb 6.6
This GDB was configured as "sparc-sun-solaris2.8".
>Description:
Gdb hangs after receiving SIGTRAP, when an already program is attached to it, and when the program is trying to load/unload shared library. I have attached testcase to reproduce this bug.


Program received signal SIGTRAP, Trace/breakpoint trap.
0xff3bbc54 in rtld_db_dlactivity () from /usr/lib/ld.so.1
(gdb) where
#0  0xff3bbc54 in rtld_db_dlactivity () from /usr/lib/ld.so.1
#1  0xff3b87c4 in elf_map_so () from /usr/lib/ld.so.1
#2  0xff3b42e8 in load_so () from /usr/lib/ld.so.1
#3  0xff3b46a4 in load_one () from /usr/lib/ld.so.1
#4  0xff3c0bb8 in dlmopen_core () from /usr/lib/ld.so.1
#5  0xff3c0c58 in dlmopen_intn () from /usr/lib/ld.so.1
#6  0xff3c0e5c in dlopen () from /usr/lib/ld.so.1
#7  0x000107dc in load_and_unload (lib_name=0x10ab0 "./myforeign.so", entry_func=0x10ac0 "Startup", is_last=0) at main.c:16
#8  0x00010900 in main (argc=1, argv=0xffbef754) at main.c:43
>How-To-Repeat:
- 'make build'
- run './test' (it will wait for an input)
- open 'gdb' in another terminal
- run at gdb prompt: gdb> 'file ./test -readnow'
- gdb> attach <test_PID>   (find PID for ./test and attach it here)
- enter a number to ./test program to continue it
- run continue on gdb prompt
- gdb will stuck with following error:

Program received signal SIGTRAP, Trace/breakpoint trap.
0xff3bbc54 in rtld_db_dlactivity () from /usr/lib/ld.so.1
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:
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