[GEM-dev] crash after destroying gemwin

[Georg Holzmann]

Hallo!

Don't know if this depends on my graphic card, but I only wanted to 
report it ...

When I destroy the gemwin, I get a crash.
(on debian, latest gem from cvs compiled against latest pd from millers 
site)

here the gdb backtrace:
---------8<--------------------
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1211365152 (LWP 15718)]
0xb730b820 in ?? ()
(gdb) bt
#0  0xb730b820 in ?? ()
#1  0xb7901cec in glXDestroyContext () from /usr/lib/libGL.so.1
#2  0xb7903df0 in glXMakeCurrentReadSGI () from /usr/lib/libGL.so.1
#3  0xb7904083 in glXMakeCurrent () from /usr/lib/libGL.so.1
#4  0xb7a9cba4 in GemMan::destroyWindow () from 
/usr/lib/pd/extra/Gem.pd_linux
#5  0xb7a9d305 in GemMan::render () from /usr/lib/pd/extra/Gem.pd_linux
#6  0x080b1fa3 in sched_tick (next_sys_time=83107840) at m_sched.c:355
#7  0x080b2c76 in m_scheduler () at m_sched.c:460
#8  0x080b5e5a in sys_main (argc=4, argv=0xbf838284) at s_main.c:316
#9  0x080bf0ff in main (argc=Cannot access memory at address 0x0
) at s_entry.c:27
(gdb)
---------8<--------------------

the backtrace with valgrind:
---------8<--------------------
==16489== Jump to the invalid address stated on the next line
==16489==    at 0x5422820: ???
==16489==    by 0x47EADEF: glXMakeContextCurrent (in /usr/lib/libGL.so.1.2)
==16489==    by 0x47EB082: glXMakeCurrent (in /usr/lib/libGL.so.1.2)
==16489==    by 0x4530BA3: GemMan::destroyWindow() (in 
/usr/lib/pd/extra/Gem.pd_linux)
==16489==    by 0x4531304: GemMan::render(void*) (in 
/usr/lib/pd/extra/Gem.pd_linux)
==16489==    by 0x80B1FA2: sched_tick (m_sched.c:355)
==16489==  Address 0x5422820 is not stack'd, malloc'd or (recently) free'd
==16489==
==16489== Process terminating with default action of signal 11 (SIGSEGV)
==16489==  Access not within mapped region at address 0x5422820
==16489==    at 0x5422820: ???
==16489==    by 0x47EADEF: glXMakeContextCurrent (in /usr/lib/libGL.so.1.2)
==16489==    by 0x47EB082: glXMakeCurrent (in /usr/lib/libGL.so.1.2)
==16489==    by 0x4530BA3: GemMan::destroyWindow() (in 
/usr/lib/pd/extra/Gem.pd_linux)
==16489==    by 0x4531304: GemMan::render(void*) (in 
/usr/lib/pd/extra/Gem.pd_linux)
==16489==    by 0x80B1FA2: sched_tick (m_sched.c:355)
---------8<--------------------

LG
Georg