Peter Odding <peter <at> peterodding.com> writes:
>
> The regex is a 77 KB monstrosity that's supposed to match a predefined
> set of strings in 2html.vim output and is complicated by the fact that
> it also matches strings with embedded HTML tags. The regex is corrupt
> because of a bug in my plug-in; I forgot to escape special characters
> like [.
I can reproduce the same crash with a much simpler, valid, very long regex:
a\|a\|a\|...
$ vim -Ngfu NONE --noplugin -c "execute '/' . repeat('a\|', 9000) . 'a'"
Vim: Caught deadly signal SEGV
On my system, it crashes with 9000 repetitions but not 8000.
> I'm also attaching a backtrace from GDB and the output of Valgrind,
> which tell me that Vim crashes because of a NULL pointer dereference at
> regexp.c:4730 in the latest Vim 7.3 source. I've tried reasoning about
> this but regmatch() is far too complex for my comprehension at the
> moment
gdb shows the same backtrace as yours:
(gdb) bt
#0 0x000000000055a545 in regmatch (scan=0x953cba "\003") at regexp.c:4730
#1 0x0000000000557dd5 in regtry (prog=0x953ca0, col=0) at regexp.c:3711
#2 0x0000000000557b9c in vim_regexec_both (line=0xab3f30 "", col=0, tm=0x0) at
regexp.c:3600
#3 0x00000000005574c7 in vim_regexec (rmp=0x7fffffffdd00, line=0xab3f30 "",
col=0) at regexp.c:3347
#4 0x00000000004b85cd in match_file_pat (pattern=0x0, prog=0x953ca0,
fname=0xab3f30 "", sfname=0x0, tail=
0xab3f30 "", allow_dirs=0) at fileio.c:10003
#5 0x00000000004b7bd2 in auto_next_pat (apc=0x7fffffffde50, stop_at_last=0) at
fileio.c:9525
#6 0x00000000004b77d8 in apply_autocmds_group (event=EVENT_VIMENTER,
fname=0xab3f30 "", fname_io=0x0, force=0,
group=-3, buf=0x88c150, eap=0x0) at fileio.c:9358
#7 0x00000000004b7108 in apply_autocmds (event=EVENT_VIMENTER, fname=0x0,
fname_io=0x0, force=0, buf=0x88c150)
at fileio.c:8994
#8 0x00000000004d3973 in main (argc=6, argv=0x7fffffffe1e8) at main.c:903
Carlo
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