Here's a proper backtrace, now that I have installed debugging symbols. I
haven't looked at the code in detail, but we need to avoid dereferencing a
null pointer here (presumably, this code shouldn't be reached if the braille
display is not available).
Core was generated by `/sbin/brltty'.
Program terminated with signal 11, Segmentation fault.
#0 api_flush (brl=brl@entry=0x7f66f988aa40) at
../../Programs/brlapi_server.c:2459
2459 ../../Programs/brlapi_server.c: No such file or directory.
(gdb) thread apply all bt full
Thread 2 (Thread 0x7f66f967e700 (LWP 25543)):
#0 0x00007f66f6fdf1d3 in select () at ../sysdeps/unix/syscall-template.S:82
No locals.
#1 0x00007f66f98614c7 in server (arg=<optimized out>) at
../../Programs/brlapi_server.c:2097
__cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf =
{140080249742518, -8140245095272564004, 140735613120096, 140080247728576,
140080249344064, 3, 8198232446201346780, 8198232727745313500},
__mask_was_saved = 0}}, __pad = {0x7f66f967df60, 0x0, 0x0, 0x0}}
__cancel_arg = 0x0
__not_first_call = <optimized out>
hosts = <optimized out>
attr = {__size =
"\000\000\000\000\000\000\000\000\001\000\000\000\000\000\000\000\000\020",
'\000' <repeats 16 times>, "\001", '\000' <repeats 20 times>, __align = 0}
i = <optimized out>
res = <optimized out>
addr = {ss_family = 1, __ss_align = 0, __ss_padding = '\000' <repeats
111 times>}
addrlen = 2
c = <optimized out>
currentTime = 1339727918
sockset = {fds_bits = {2624, 0 <repeats 15 times>}}
resfd = <optimized out>
fdmax = 11
tv = {tv_sec = 0, tv_usec = 172495}
n = <optimized out>
blockedSignals = {__val = {86530, 0 <repeats 15 times>}}
#2 0x00007f66f729ab50 in start_thread (arg=<optimized out>) at
pthread_create.c:304
__res = <optimized out>
pd = 0x7f66f967e700
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140080247727872,
-8140245095272564004, 140735613120096, 140080247728576, 140080249344064, 3,
8198232446270552796, 8198209821850581724},
mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x0, 0x0}, data =
{prev = 0x0, cleanup = 0x0, canceltype = 0}}}
not_first_call = <optimized out>
freesize = <optimized out>
__PRETTY_FUNCTION__ = "start_thread"
#3 0x00007f66f6fe56dd in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#4 0x0000000000000000 in ?? ()
No symbol table info available.
Thread 1 (Thread 0x7f66f97dd720 (LWP 25542)):
#0 api_flush (brl=brl@entry=0x7f66f988aa40) at
../../Programs/brlapi_server.c:2459
oldbuf = 0x1 <Address 0x1 out of bounds>
buf = <optimized out>
c = 0x7f66fb035ef0
ok = 1
drain = 0
newCursorShape = <optimized out>
#1 0x00007f66f982f90b in brlttyUpdate () at ../../Programs/brltty.c:3864
No locals.
#2 0x00007f66f98284a5 in brlttyRun () at ../../Programs/main.c:32
No locals.
#3 main (argc=<optimized out>, argv=<optimized out>) at
../../Programs/main.c:183
exitStatus = <optimized out>
(gdb) print disp
$1 = (BrailleDisplay *) 0x0
(gdb)
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