Setting wnd_vis=1 under [mastermixer] in reaper.ini causes a segfault for me.
Running the application under gdb or valgrind gives no indication of a segfault happening, so my guess is it's a Heisenbug.
Here's the relevant crash info I was able to get from the kernel logs:
Code:
Aug 18 18:06:38 m kernel: reaper[9793]: segfault at 38 ip 00000000007780af sp 00007ffd2a7470c0 error 4 in reaper[400000+7d7000]
Aug 18 18:06:38 m systemd[1]: Started Process Core Dump (PID 9795/UID 0).
Aug 18 18:06:38 m systemd-coredump[9796]: Process 9793 (reaper) of user 1000 dumped core.
Stack trace of thread 9793:
#0 0x00000000007780af n/a (reaper)
#1 0x00007f08f5d6489d n/a (libSwell.so)
#2 0x000000000069d311 n/a (reaper)
#3 0x00000000005f95eb n/a (reaper)
#4 0x0000000000775f01 n/a (reaper)
#5 0x00000000006fe521 n/a (reaper)
#6 0x00000000009d354b SWELLAppMain (reaper)
#7 0x00007f08f5d75428 n/a (libSwell.so)
#8 0x00007f08f5a6c526 n/a (libgdk-3.so.0)
#9 0x00007f08f5a9de45 n/a (libgdk-3.so.0)
#10 0x00007f08f4974368 g_main_context_dispatch (libglib-2.0.so.0)
#11 0x00007f08f49745b1 n/a (libglib-2.0.so.0)
#12 0x00007f08f497463e g_main_context_iteration (libglib-2.0.so.0)
#13 0x00007f08f5d774aa n/a (libSwell.so)
#14 0x00007f08f5d51e08 n/a (libSwell.so)
#15 0x0000000000820ade n/a (reaper)
#16 0x0000000000704fed n/a (reaper)
#17 0x0000000000412a19 n/a (reaper)
#18 0x00007f08f5dfb223 __libc_start_main (libc.so.6)
#19 0x000000000041801a _start (reaper)
If it helps any, I'm on i3wm, a tiling window manager.