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Date: Sat, 02 Jun 2012 00:18:55 +0200
From: aep <aep@...s.org>
To: <musl@...ts.openwall.com>
Subject: hm, libc crashes loading libc
with git 9ea20dcbaafe790bb034adadf05698088a2f9fab
this stuff scares me, so i'll just dump the relevant information,
hoping someone knows what to do with it.
aep@...htbringer: /tmp echo "int main() {} " | musl-gcc -x c++ -
aep@...htbringer: /tmp ./a.out
zsh: segmentation fault ./a.out
#0 find_sym (dso=0x7ffff7ff8a00, s=s@...ry=0x7ffff7d7801d "__cgt",
need_def=0) at src/ldso/dynlink.c:131
#1 0x00007ffff7d811a0 in do_relocs (dso=0x7ffff7ff8a00,
strings=0x7ffff7d74d50 "", syms=0x7ffff7d6bdc8, rel_size=624,
rel=0x7ffff7d786e8, base=0x7ffff7d69000 "\177ELF\002\001\001",
stride=<optimized out>) at src/ldso/dynlink.c:161
#2 reloc_all (p=p@...ry=0x7ffff7ff8a80) at src/ldso/dynlink.c:481
#3 0x00007ffff7d82667 in __dynlink (argc=<optimized out>,
argv=<optimized out>) at src/ldso/dynlink.c:643
#4 0x00007ffff7d831e2 in _start () at src/ldso/x86_64/start.s:6
#5 0x0000000000000001 in ?? ()
#6 0x00007fffffffe77e in ?? ()
#7 0x0000000000000000 in ?? ()
reakpoint 1, reloc_all (p=p@...ry=0x7ffff7ff8a80) at
src/ldso/dynlink.c:472
472 {
(gdb) print p
$1 = (struct dso *) 0x7ffff7ff8a80
(gdb) p p->name
$3 = 0x7ffff7dcc012 "libc.so"
(gdb) step
Program received signal SIGSEGV, Segmentation fault.
find_sym (dso=0x7ffff7ff8a00, s=s@...ry=0x7ffff7d7801d "__cgt",
need_def=0) at src/ldso/dynlink.c:131
131 sym = lookup(s, h, dso->syms, dso->hashtab, dso->strings);
(gdb) print dso
$2 = (struct dso *) 0x7ffff7ff8a00
(gdb) step
lookup (strings=0x400308 "", hashtab=0x0, syms=0x400278, h=6642148,
s=0x7ffff7d7801d "__cgt") at src/ldso/dynlink.c:111
111 for (i=hashtab[2+h%hashtab[0]]; i; i=hashtab[2+hashtab[0]+i]) {
(gdb) step
Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.
(gdb)
hashtab=0x0 sounds wrong, but how did it become zero?
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