[BRLTTY] Crash of BRLTTY in X session

[Samuel Thibault]

Hello,

Sebastian Humenda, le mar. 05 nov. 2024 10:52:19 +0100, a ecrit:
> With BRLTTY 6.7, BRLTTY crashed while I was using Orca in the X session. The
> back trace is below.

> Thread 1 (Thread 0x7f2092ffe6c0 (LWP 589460)):
> #5  0x00007f20963ec7ba in malloc_printerr (str=str at entry=0x7f20964ef0b1 "free(): invalid pointer") at ./malloc/malloc.c:5660
> #6  0x00007f20963ee544 in _int_free (av=<optimized out>, p=<optimized out>, have_lock=have_lock at entry=0) at ./malloc/malloc.c:4435
> #7  0x00007f20963f0e9f in __GI___libc_free (mem=<optimized out>) at ./malloc/malloc.c:3385
> #8  0x00005637596a87bc in freeKeyrangeList (l=l at entry=0x7f2084025ce0) at ../../Programs/brlapi_keyranges.c:65
> #9  0x00005637596a12c6 in doLeaveTty (c=c at entry=0x7f2084025c50) at ../../Programs/brlapi_server.c:993

So it'd either be a concurrent operation on c->acceptedKeys, or a memory
corruption from somewhere else. This code has not really changed since
6.6, so it seems unlikely to me (and I have re-proofread it), so I'd
tend to think about "somewhere else". Ideally you could run it through
valgrind, but that'd probably be way too heavy. Perhaps you can
recompile with CFLAGS=-fsanitize=address LDFLAGS=-fsanitize=address ?

Samuel