Hanging conftest

[Michal Privoznik]

Hey guys,

I've just discovered a bug, well a hang in conftest. This is what I ran:

libvirt.git $ git clean -fxd; ./autogen.sh --system

and all looked good until this:

checking whether readlink signature is correct... yes
checking whether readlink handles trailing slash correctly... yes
checking for working re_compile_pattern... 

When the configure script hang and didn't continue. Attaching a debugger to 
hanging conftest process showed:

$ gdb -p $(pgrep conftest)
GNU gdb (Gentoo 7.5.1 p2) 7.5.1
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.gentoo.org/>.
Attaching to process 11210
Reading symbols from /home/zippy/tmp/libvirt.git/conftest...done.

warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
Reading symbols from /lib64/libc.so.6...Reading symbols from 
/usr/lib64/debug/lib64/libc-2.15.so.debug...done.
done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from 
/usr/lib64/debug/lib64/ld-2.15.so.debug...done.
done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
__lll_lock_wait_private () at 
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:93
93      ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S: No such file or 
directory.
(gdb) bt
#0  __lll_lock_wait_private () at 
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:93
#1  0x0000003274e7fbd3 in _L_lock_11326 () at malloc.c:5236
#2  0x0000003274e7dd55 in __GI___libc_malloc (bytes=53) at malloc.c:2921
#3  0x0000003274a0533a in local_strdup (s=0x7feab7a0bf21 
"/usr/lib/gcc/x86_64-pc-linux-gnu/4.8.2/libgcc_s.so.1") at dl-load.c:162
#4  0x0000003274a08588 in _dl_map_object (address@hidden, address@hidden 
"libgcc_s.so.1", address@hidden, address@hidden, address@hidden, 
nsid=<optimized out>)
    at dl-load.c:2249
#5  0x0000003274a12a2c in dl_open_worker (address@hidden) at dl-open.c:225
#6  0x0000003274a0e8c4 in _dl_catch_error (address@hidden, address@hidden, 
address@hidden, address@hidden <dl_open_worker>, 
    address@hidden) at dl-error.c:178
#7  0x0000003274a124b1 in _dl_open (file=0x3274f60e30 "libgcc_s.so.1", 
mode=-2147483647, caller_dlopen=<optimized out>, nsid=-2, argc=1, 
argv=0x7fff58d2c9d8, env=0x7fff58d2c9e8) at dl-open.c:639
#8  0x0000003274f1b202 in do_dlopen (address@hidden) at dl-libc.c:89
#9  0x0000003274a0e8c4 in _dl_catch_error (objname=0x7fff58d2b9c0, 
errstring=0x7fff58d2b9c8, mallocedp=0x7fff58d2b9bf, operate=0x3274f1b1c0 
<do_dlopen>, args=0x7fff58d2b9e0) at dl-error.c:178
#10 0x0000003274f1b29f in dlerror_run (address@hidden <do_dlopen>, 
address@hidden) at dl-libc.c:48
#11 0x0000003274f1b311 in __GI___libc_dlopen_mode (address@hidden 
"libgcc_s.so.1", address@hidden) at dl-libc.c:165
#12 0x0000003274ef7895 in init () at ../sysdeps/x86_64/../ia64/backtrace.c:53
#13 0x0000003274ef79e5 in __GI___backtrace (address@hidden, address@hidden) at 
../sysdeps/x86_64/../ia64/backtrace.c:104
#14 0x0000003274e74364 in __libc_message (address@hidden, address@hidden "*** 
glibc detected *** %s: %s: 0x%s ***\n") at 
../sysdeps/unix/sysv/linux/libc_fatal.c:178
#15 0x0000003274e79d2e in malloc_printerr (action=3, str=0x3274f6248b 
"malloc(): memory corruption", ptr=<optimized out>) at malloc.c:5007
#16 0x0000003274e7b7e4 in _int_malloc (av=0x32751a1620 <main_arena>, 
bytes=<optimized out>) at malloc.c:3555
#17 0x0000003274e7ed90 in __libc_calloc (n=216713008672, address@hidden, 
elem_size=0, address@hidden) at malloc.c:3274
#18 0x0000003274ec237b in create_cd_newstate (hash=4, context=0, 
nodes=0x7fff58d2c5f0, dfa=0x1d0b6c0) at regex_internal.c:1671
#19 re_acquire_state_context (address@hidden, address@hidden, address@hidden, 
context=0) at regex_internal.c:1546
#20 0x0000003274ec7d4d in transit_state_mb (pstate=<optimized out>, 
pstate=<optimized out>, mctx=0x7fff58d2c620) at regexec.c:2575
#21 transit_state (state=0x1d0d340, mctx=0x7fff58d2c620, err=0x7fff58d2c5e8) at 
regexec.c:2286
#22 check_matching (p_match_first=0x7fff58d2c5e4, fl_longest_match=1, 
mctx=0x7fff58d2c620) at regexec.c:1172
#23 re_search_internal (address@hidden <regex.3883>, address@hidden <data.3891> 
"ကျွန်ုပ်x", address@hidden, start=<optimized out>, address@hidden, 
address@hidden, 
    address@hidden, nmatch=<optimized out>, address@hidden, address@hidden, 
address@hidden) at regexec.c:843
#24 0x0000003274ecc022 in re_search_stub (address@hidden <regex.3883>, 
address@hidden <data.3891> "ကျွန်ုပ်x", address@hidden, address@hidden, 
range=<optimized out>, 
    address@hidden, address@hidden, address@hidden, address@hidden) at 
regexec.c:463
#25 0x0000003274ecc8b8 in __re_search (address@hidden <regex.3883>, 
address@hidden <data.3891> "ကျွန်ုပ်x", address@hidden, address@hidden, 
address@hidden, 
    address@hidden) at regexec.c:326
#26 0x00000000004009ac in main () at conftest.c:421
(gdb) 


Let me know if you need any more info.

Michal