[BRLTTY] BRLTTY 4.4 segfault with backtrace

[Jason White]

Hello all,

A while ago I reported experiencing occasional, hard to reproduce, segfaults
under BRLTTY 4.3 when my braille display was powered down (it's a Baum
SuperVario 40/Humanware Brailliant).

This time I managed to get a core file.

Unfortunately, Debian does not include a package of debug symbols for BRLTTY;
I can report this as a bug if you wish. Consequently I don't have line number
information, but I'm holding the core file in case there is more that can be
extracted from it. Regrettably I haven't been able to reproduce the problem;
I've been running BRLTTY with core dumps enabled in the hope of catching the
issue.

Here's the backtrace.


Core was generated by `brltty'.
Program terminated with signal 11, Segmentation fault.
#0  0x00007f3513668ce4 in api_flush ()
(gdb) thread apply all bt

Thread 2 (Thread 0x7f3513484700 (LWP 5955)):
#0  0x00007f3510bdf1d3 in select () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007f35136679e7 in ?? ()
#2  0x00007f3510e9ab50 in start_thread (arg=<optimized out>) at pthread_create.c:304
#3  0x00007f3510be56dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#4  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f35135e3720 (LWP 5954)):
#0  0x00007f3513668ce4 in api_flush ()
#1  0x00007f3513635adb in brlttyUpdate ()
#2  0x00007f351362e545 in main ()