Hi developers,
currently I'm struggling with a segfault during termdebug. It was introduced
with v8.1.105 when the variable tab stops had been introduced. I don't
really understand why but it happens only with a stripped vim binary in
console. System is Ubuntu 14.04 with custom compiled Vim.
Here is the recipe to reproduce:
cat >test.c <<EOF
int main(void) {
int ret = 0;
return ret;
}
EOF
gcc -g test.c
vim -u NONE -N -c "set mouse=n|packadd termdebug|Termdebug a.out" test.c
Now hoover the mouse over the word "return" in the source code window and vim
will be
terminated with a segfault.
As mentioned it happens only for the stripped binary running in console. It
does not happen if the stripped vim is run in gdb. So debugging is a little bit
tricky:
cp vim vim.debug
strip --only-keep-debug vim.debug
strip vim
sudo gdb attach $(pidof vim) -ex cont
And this is the information I get:
Program received signal SIGSEGV, Segmentation fault.
__GI___libc_free (mem=0x6f6d2e6d) at malloc.c:2931
2931 malloc.c: No such file or directory.
>>> bt
#0 __GI___libc_free (mem=0x6f6d2e6d) at malloc.c:2931
#1 0x00000000004444bc in get_beval_info ()
#2 0x000000000044480b in general_beval_cb ()
#3 0x0000000000493b0a in check_due_timer ()
#4 0x00000000005ca1d5 in ui_wait_for_chars_or_timer ()
#5 0x000000000053bc24 in mch_inchar ()
#6 0x00000000005cbea5 in ui_inchar ()
#7 0x00000000004d092f in ?? ()
#8 0x00000000004d26e0 in ?? ()
#9 0x00000000004d312a in vgetc ()
#10 0x00000000005c6ae4 in terminal_loop ()
#11 0x000000000062816a in main_loop ()
#12 0x0000000000628fad in vim_main2 ()
#13 0x0000000000441ad9 in main ()
>>> symbol-file vim.debug
Reading symbols from vim.debug...done.
>>> bt
#0 __GI___libc_free (mem=0x6f6d2e6d) at malloc.c:2931
#1 0x0000000000500a7d in vim_free (x=<optimized out>) at misc2.c:1837
#2 0x00000000004444bc in get_beval_info (beval=0x1f5f230,
getword=<optimized out>, winp=0x7ffc22586ff8, lnump=0x7ffc22587000,
textp=0x7ffc22587008, colp=0x7ffc22586ff4) at beval.c:129
#3 0x0000000001eb7560 in ?? ()
#4 0x0000000000000000 in ?? ()
>>> f 2
#2 0x00000000004444bc in get_beval_info (beval=0x1f5f230,
getword=<optimized out>, winp=0x7ffc22586ff8, lnump=0x7ffc22587000,
textp=0x7ffc22587008, colp=0x7ffc22586ff4) at beval.c:129
129 vim_free(beval->vts);
>>> l
124 *lnump = lnum;
125 *textp = lbuf;
126 *colp = col;
127 #ifdef FEAT_VARTABS
128 if (beval->vts)
129 vim_free(beval->vts);
130 beval->vts =
tabstop_copy(wp->w_buffer->b_p_vts_array);
131 #endif
132 beval->ts = wp->w_buffer->b_p_ts;
133 return OK;
I hope I provided enough information to nail down the cause. If something is
missing I'll be happy to help.
Markus Braun
--
Any errors in spelling, tact or fact are transmission errors
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