Comments (18)
Does it reproduce reliably? Can you try with 'make clean debug' and redirect
2>logfile.txt, and see if it happens again? Also, regardless of the outcome,
please
then try "grep ALLOC logfile.txt".
Original comment by [email protected]
on 24 Mar 2010 at 5:08
from skipfish.
Yes it is happens all the time.
njh@packard:~/Download/skipfish$ fgrep ALLOC logfile.txt
njh@packard:~/Download/skipfish$ ls -l logfile.txt
-rw-r--r-- 1 njh njh 0 Mar 24 17:21 logfile.txt
njh@packard:~/Download/skipfish$
Original comment by fumeoftheday
on 24 Mar 2010 at 5:23
from skipfish.
The logfile has a size of 0, which suggests it's not generated for a 'make clean
debug' build? Can you verify?
Original comment by [email protected]
on 24 Mar 2010 at 6:25
from skipfish.
Oh wait, this happens during load_keywords(), never mind. Can you provide me
with a
gdb backtrace for the 'make clean debug' target, though?
Cheers,
/mz
Original comment by [email protected]
on 24 Mar 2010 at 6:48
from skipfish.
Specifically, I would be interesting with the output of these commands in gdb
against
a *debug* build:
back
p extension_cnt
Unfortunately, I can't reproduce this locally, so I am also wondering what OS /
distro you happen to be using?
Original comment by [email protected]
on 24 Mar 2010 at 6:55
from skipfish.
(gdb) back
#0 0x00007f9abc51bf45 in *__GI_raise (sig=<value optimized out>)
at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1 0x00007f9abc51ed80 in *__GI_abort () at abort.c:88
#2 0x00007f9abc55154d in __libc_message (do_abort=2,
fmt=0x7fff0e3513c0 ' ' <repeats 23 times>, "[stack]\n7fff0e3ff000-7fff0e400000
r-xp 00000000 00:00 0", ' ' <repeats 26 times>,
"[vdso]\nffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0", ' ' <repeats
18
times>, "[vsyscall]\n:06 4"...) at ../sysdeps/unix/sysv/linux/libc_fatal.c:173
#3 0x00007f9abc55ad16 in malloc_printerr (action=3,
str=0x7f9abc602baf "realloc(): invalid pointer", ptr=<value optimized out>)
at malloc.c:6239
#4 0x00007f9abc5610c5 in realloc_check (oldmem=0x172a480, bytes=16,
caller=<value optimized out>) at hooks.c:330
#5 0x0000000000412700 in __DFL_ck_realloc (orig=0x172a480, size=5065,
func=0x432210 "wordlist_confirm_single", line=841,
file=<value optimized out>) at alloc-inl.h:91
#6 __AD_ck_realloc (orig=0x172a480, size=5065,
func=0x432210 "wordlist_confirm_single", line=841,
file=<value optimized out>) at alloc-inl.h:258
#7 0x00000000004134f1 in wordlist_confirm_single (text=0x7fff0e351c90 "asmx",
is_ext=<value optimized out>, add_hits=<value optimized out>, total_age=2,
last_age=<value optimized out>) at database.c:841
#8 0x000000000041370a in load_keywords (fname=<value optimized out>,
---Type <return> to continue, or q <return> to quit---
purge_age=0) at database.c:976
#9 0x0000000000403939 in main (argc=6, argv=0x7fff0e351eb8) at skipfish.c:398
(gdb) p extension_cnt
$1 = 1
(gdb)
This is on Debian 5. The output of 'uname -a' is:
Linux packard 2.6.32-3-amd64 #1 SMP Wed Feb 24 18:07:42 UTC 2010 x86_64
GNU/Linux
Original comment by fumeoftheday
on 25 Mar 2010 at 9:08
from skipfish.
This crash doesn't really make much sense to me. It's essentially crashing
immediately upon start when reading the second line in the supplied dictionary.
Very
little is happening in the code prior to this point, so it's hard to imagine
what
could be wrong; and you are the only person reporting this issue so far,
despite 50k+
downloads.
I will keep this bug open, but not being able to reproduce or figure out where
that
pointer came from means I might have to close it if no other reports surface.
Original comment by [email protected]
on 25 Mar 2010 at 5:41
from skipfish.
Ok. I tracked this down to MALLOC_CHECK_ being apparently set on your system.
Version
1.26 should be able to account for this.
Original comment by [email protected]
on 26 Mar 2010 at 6:54
- Changed state: Fixed
from skipfish.
Yes, malloc_check_ IS set to 3 on my system.
Original comment by fumeoftheday
on 26 Mar 2010 at 9:08
from skipfish.
[deleted comment]
from skipfish.
I just tried it on version 1.26b and I got the same crash.
Original comment by fumeoftheday
on 29 Mar 2010 at 11:02
from skipfish.
Please set MALLOC_CHECK_ to 0 manually before executing the tool and let me
know if
this helps.
Original comment by [email protected]
on 29 Mar 2010 at 4:05
from skipfish.
Still crashes.
I am compiling with -fstack-protector, if that helps.
Original comment by fumeoftheday
on 29 Mar 2010 at 4:24
from skipfish.
Huh? Why? Did you modify the Makefile manually? Were any other options added to
CFLAGS? If yes, can you let me know if you are still seeing problems when you
remove
them?
Original comment by [email protected]
on 29 Mar 2010 at 5:12
from skipfish.
It comes in from CFLAGS.
If I disable it I no longer get a crash, so it looks as though you have a buffer
overflow problem somewhere.
Original comment by fumeoftheday
on 30 Mar 2010 at 9:05
from skipfish.
Did you have anything else in CFLAGS, or just -fstack-protector?
The crash seems unrelated to the mechanism, which is odd.
Original comment by [email protected]
on 30 Mar 2010 at 3:43
from skipfish.
njh@packard:~$ echo $CFLAGS
-O2 -W -Wformat=2 -Wswitch -Wshadow -Wwrite-strings -Wuninitialized -Wall -pipe
-mtune=core2 -march=core2 -fomit-frame-pointer -ffast-math -msse2 -msse -mmmx
-mfpmath=sse -pedantic -D_FORTIFY_SOURCE=2 -Wpointer-arith -Wstrict-prototypes
-fstack-protector -Wstack-protector -Wextra -Wbad-function-cast -Wcast-align
-Wcast-qual -Wdisabled-optimization -Wendif-labels -Wfloat-equal
-Wformat-nonliteral
-Winline -Wmissing-declarations -Wmissing-prototypes -Wnested-externs
-Wpointer-arith
-Wundef -Wformat-security
Original comment by fumeoftheday
on 30 Mar 2010 at 3:45
from skipfish.
OK, I believe your problem is -D_FORTIFY_SOURCE=2. It's a bug in FORTIFY_SOURCE
in
GCC, not in skipfish.
It would have helped troubleshoot this problem if you described these
non-standard
tweaks to your system (MALLOC_CHECK, FORTIFY_SOURCE, -fstack-protector, etc) up
front.
I will have a tweak in 1.27 to reorder CFLAGS to always force FORTIFY_SOURCE
off.
/mz
Original comment by [email protected]
on 30 Mar 2010 at 3:55
from skipfish.
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