Hi.
The screen keeps crashing with SIGSEGV lately. I started investigating
when I experienced it on a released version, but it still crashed with
Git version(d69bc26). I'm using screen with UTF8 but I set the encoding
of the window I was operating on to euc and the $LANG was set to
ja_JP.eucJP. I was backwards-searching the bash's history when the screen
crashed:
#0 0x003aa7a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
#1 0x003eb7a5 in raise () from /lib/tls/libc.so.6
#2 0x003ed209 in abort () from /lib/tls/libc.so.6
#3 0x0804ac11 in CoreDump (sigsig=11) at screen.c:1685
#4 <signal handler called>
#5 0x0808b200 in recode_mline (ml=0x50, w=80, from=1, to=8) at encoding.c:545
#6 0x08086763 in LInsChar (l=0x9dbb154, c=0x9dbd5a0, x=0, y=48, ol=0x0)
at layer.c:278
#7 0x08086c3e in LWrapChar (l=0x9dbb154, c=0x9dbd5a0, y=47, top=0, bot=49,
ins=1) at layer.c:731
#8 0x080555c8 in WriteString (wp=0x9dbb148,
buf=0xbfffc315 "...(some japanese string)", ' ' <repeats 26 times>...,
len=170) at ansi.c:873
#9 0x0806367e in win_readev_fn (ev=0x9dbb1c0, data=0x9dbb148 "\200\224?\t")
at window.c:1932
#10 0x080892fe in sched () at sched.c:237
#11 0x0804f9e4 in main (ac=0, av=0xbfffea8c) at screen.c:1464
In frame 7, ins=1 at line 759, so LInsChar() gets called with the last
parameter as NULL. Since it can call recode_mline() with ml == NULL
under some circumstances but there's no NULL check in recode_mline(),
it crashes on ml->font.
#5 0x0808b200 in recode_mline (ml=0x0, w=80, from=1, to=8) at encoding.c:545
545 if (ml->font == null && encodings[from].deffont == 0)
(gdb) l
540 static struct mline rml[2], *rl;
541 int i, c;
542
543 if (from == to || (from != UTF8 && to != UTF8) || w == 0)
544 return ml;
545 if (ml->font == null && encodings[from].deffont == 0)
546 return ml;
I added `ml == NULL' to the conditional on line 543 as a bandaid to this
problem. Let me know if you need some more information or if you have
a patch for me to try.
Best Regards,
YONETANI Tomokazu.
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