Re: [dev] [dwm] segfault with xrandr dual-head setup

On 01/29/2011 09:26 PM, Rob wrote:
>> Now I can work on VGA normal, but on LVDS I can only use the first
>> workspace. If I try to switch (moving windows on workspaces works) dwm
>> crashes and I see this segfault in dmesg:
>>
>> dwm[26627]: segfault at 0 ip 0804b157 sp bfbbe680 error 4 in
>> dwm[8048000+a000]
>>
>> Any ideas?
>
> Recompile dwm with debug options (config.mk - uncomment the CFLAGS and
> LDFLAGS lines which have -g).
> Next, in your .xinitrc or wherever you start dwm from, enable
> coredumps with `ulimit -c unlimited` (or `limit coredumpsize
> unlimited` for tcsh). Fire up X, get dwm to segfault then run gdb -c
> path/to/coredump path/to/dwm (give the path to dwm in its source
> directory)
> That'll give you the line it segfaulted on. Post that output here (or
> an online-clipboard site) if you would.
>
> Cheers,
> Rob.
>

gdb gives me this output:

Program terminated with signal 11, Segmentation fault.
#0 0x0804b157 in arrangemon (m=0x9280688) at dwm.c:382
382 strncpy(m->ltsymbol, m->lt[m->sellt]->symbol, sizeof m->ltsymbol);
Received on Sat Jan 29 2011 - 21:58:21 CET