toolchain/46989: gdb stepping gets confused in threaded programs

[martin%NetBSD.org@localhost]

>Number:         46989
>Category:       toolchain
>Synopsis:       gdb stepping gets confused in threaded programs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Sep 20 12:35:00 +0000 2012
>Originator:     Martin Husemann
>Release:        NetBSD 6.99.11
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD whoever-brings-the-night.aprisoft.de 6.99.11 NetBSD 6.99.11 
(WHOEVER) #3: Wed Sep 19 09:38:50 CEST 2012 
martin%emmas.aprisoft.de@localhost:/usr/src/sys/arch/sparc64/compile/WHOEVER 
sparc64
Architecture: sparc64
Machine: sparc64
>Description:

(Single) stepping in threaded programs seems to have probblems, at least
on sparc64:

Continuing.
[New LWP 2]
/usr/src/external/gpl3/gdb/dist/gdb/infrun.c:3550: internal-error: 
handle_inferior_event: Assertion `ptid_equal (singlestep_ptid, ecs->ptid)' 
failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.


>How-To-Repeat:

cd /usr/tests/lib/libpthread
gdb ./t_join
break pthread_join
run pthread_join

and then, when hitting the breakpoint, do: c

>Fix:
n/a