On 15 May 2010 02:48, Daniel Gibson
<metalcaedes@gmail.com> wrote:
Package: libphobos-4.1-dev
Version: 0.25-4.1.2-27
Severity: normal
Hi,
While trying to narrow down another bug (#581698) I noticed that my
program segfaults on exit, if there are Thread-objects that haven't
been start()ed.
While it probably doesn't make much sense to create Threads and not
start them, this shouldn't happen.
I ran it with gdb and got the following backtrace:
Program received signal SIGSEGV, Segmentation fault.
0xb7f6292b in pthread_detach () from /lib/i686/cmov/libpthread.so.0
(gdb) bt
#0 0xb7f6292b in pthread_detach () from /lib/i686/cmov/libpthread.so.0
#1 0x0805ad93 in _d_callfinalizer ()
#2 0x0805c5a6 in _D3gcx3Gcx11fullcollectMFPvZk ()
#3 0x0805ca54 in _D3gcx3Gcx16fullcollectshellMFZk ()
#4 0x0805cd8c in _D3gcx2GC18fullCollectNoStackMFZv ()
#5 0x0805a203 in gc_term ()
#6 0x0806166a in _d_run_main ()
#7 0x0805e33a in main ()
I think (but haven't tried to fix that yet) that the error is in
Thread's destructor (std/thread.d line 589/590):
if (state != TS.FINISHED)
pthread_detach(id);
The status of an unstarted Thread is TS.INITIAL - I don't know if it
is necessary to pthread_detach() a thread that hasn't run,
but if it isn't I'd suggest to change this to
if(state != TS.FINISHED && state != TS.INITIAL)
pthread_detach(id);
Thanks for your bug report. I didn't actually notice you came up with a fix first time I read your message, but I came to the same conclusion whilst having a quick 5 minute look at it.
I'll see if a bug is raised upstream, but will include your small resolution in the next version gdc version.
Thanks Daniel.
Regards