GC_descr_obj_sz miscompilation (was RE: GC_enable_incremental())

Fri Sep 10 06:01:00 GMT 2004

Boehm, Hans wrote:
>> 1) The multithreaded GC doesn't run under gdb 6.1. I suspect
> some signals are being misdirected, or the like. (I mention
> this here only because it might frustrate others, too.)

You might have better luck with GDB 6.2/6.2.1. From
the NEWS file for 6.2:
--------------------------- 8< ---------------------------
* Fix for ``many threads''
On GNU/Linux systems that use the NPTL threads library, a program
rapidly creating and deleting threads would confuse GDB leading to the
error message:
 ptrace: No such process.
 thread_db_get_info: cannot get thread info: generic error
This problem has been fixed.
[...]
* Signal trampoline code overhauled
Many generic problems with GDB's signal handling code have been fixed.
These include: backtraces through non-contiguous stacks; recognition
of sa_sigaction signal trampolines; backtrace from a NULL pointer
call; backtrace through a signal trampoline; step into and out of
signal handlers; and single-stepping in the signal trampoline.
Please note that kernel bugs are a limiting factor here. These
features have been shown to work on an s390 GNU/Linux system that
include a 2.6.8-rc1 kernel. Ref PR breakpoints/1702.
--------------------------- 8< ---------------------------
HTH,
Ranjit.
-- 
Ranjit Mathew Email: rmathew AT gmail DOT com
Bangalore, INDIA. Web: http://ranjitmathew.tripod.com/