Bug 309101

Which kudzu version?

Whoops, my mistake for not providing that:

$ rpm -q kudzu
kudzu-1.2.76-1

$

kudzu is segfaulting on me too.  I get the following when I try to run
/etc/init.d/kudzu start:

[root@localhost ~]# /etc/init.d/kudzu start
Checking for hardware changes/etc/init.d/kudzu: line 23:  3094 Segmentation
fault      /sbin/kudzu $KUDZU_ARGS
                                                           [FAILED]

And the following gets logged in /var/log/messages:

Nov 11 18:26:22 localhost kudzu[3125]: obsolete kudzu ddcProbe called
Nov 11 18:26:22 localhost kernel: kudzu[3125]: segfault at 00000000 eip 001b8bc8
esp bfc728dc error 4


I don't know if this is the same problem reported in this bug but it looks
similar.  It happens in the final version of Fedora 8 plus latest updates.  The
funny thing is that I installed it on my Desktop (AMD Athlon 2000+) and it works
fine there.  It fails only on my laptop (Dell XPS M1210 Intel Core Duo).

My packages are:
kudzu-1.2.79-1
glibc-2.7-2
kernel-2.6.23.1-49.fc8

Maybe we should update the version and severity of this bug report.  I guess
this particular problem is keeping my sound card from working correctly on my
laptop.  So far I get no sound on my shiny new system.

William - this has nothing to do with any sound problems you have - please file
those separately.

If you do 'strace /usr/sbin/kudzu', what's the output (and does it crash?)?

Created attachment 255671 [details]
Output of strace -tt /sbin/kudzu as root

This is the output you asked.  If you need me to, I can install debuginfo
packages and try to get an stack trace, just tell me what other debuginfo
packages do I need besides kudzu.

kudzu-debuginfo should almost certainly be enough, but if you want the full
stack, 'debuginfo-install kudzu' should DTRT.

The most incredible thing just happened: For some reason kudzu doesn't fail
anymore.  It apparently fixed it self when I installed the debuginfo packages
but now that I removed all of them it still works fine.  I remember I tried a
gdb execution before the debuginfo packages but I only got a very lame backtrace.

It works fine in both: the boot process and directly from the console as root. 
Now when I execute /etc/init.d/kudzu start the only thing that gets logged in
messages is: localhost kudzu[2754]: obsolete kudzu ddcProbe called

The funny thing is that it _always_ failed on me after installation.  Is there
anything wrong that you can see on the attached strace output in comment #5 ??

I'll keep an eye on it and see if it fails again.

No particular reason it would start succeeding, no; at least ,not unless your
hardware information changed at the same time.

Created attachment 290504 [details]
My crashing kudzu strace

kudzu-1.2.79.1-1 (Fedora 8)
kernel-2.6.23.9-85.fc8
glibc-2.7-2

Checking for hardware changes/etc/init.d/kudzu: line 23:  3261 Segmentation
fault      /sbin/kudzu $KUDZU_ARGS
                                                           [FAILED]
[rngadam@localhost ~]$ dmesg | grep kudzu
kudzu[1531]: segfault at 00000000 eip 00180bc8 esp bfcefd2c error 4
kudzu[3261]: segfault at 00000000 eip 00180bc8 esp bfcc90fc error 4

as per comment #3 idea rejected by Bill that sound not working is not related to
kudzu... If kudzu crash before completion, wouldn't the setup for sound not
complete?

I also tried gdb after installing with `yum install kudzu-debuginfo`:

(gdb) file /sbin/kudzu
Reading symbols from /sbin/kudzu...warning: the debug information found in
"/usr/lib/debug//sbin/kudzu.debug" does not match "/sbin/kudzu" (CRC mismatch).

even if I seem to have the correct package installed:

[rngadam@localhost ~]$ rpm -q kudzu-debuginfo
kudzu-debuginfo-1.2.79-1
[rngadam@localhost ~]$ rpm -q kudzu
kudzu-1.2.79.1-1

when I went ahead and used `debuginfo-install kudzu`, it also sets
kudzu-debuginfo to be updated once again and I'm able to get this stacktrace:

(gdb) run
Starting program: /sbin/kudzu 

Program received signal SIGSEGV, Segmentation fault.
0x00180bc8 in strcmp () from /lib/libc.so.6
(gdb) bt
#0  0x00180bc8 in strcmp () from /lib/libc.so.6
#1  0x0805113b in isAliased (cf=0x9d519b0, alias=0x8061351 "snd-card-", 
    module=0x0) at modules.c:339
#2  0x0804b353 in isConfigured (dev=0x9d5fb60) at hwconf.c:472
#3  0x0804c500 in configMenu (oldDevs=0x0, newDevs=0x9d60818, runFirst=1)
    at hwconf.c:777
#4  0x0804cce0 in main (argc=Cannot access memory at address 0x0
) at hwconf.c:978
#5  0x00127390 in __libc_start_main (main=0x804c580 <main>, argc=1, 
    ubp_av=0xbf89ab64, init=0x8060df0 <__libc_csu_init>, 
    fini=0x8060de0 <__libc_csu_fini>, rtld_fini=0x31e940 <_dl_fini>, 
    stack_end=0xbf89ab5c) at libc-start.c:220
#6  0x0804a151 in _start ()

Created attachment 290557 [details]
small patch to add else so as not to invoke isAliased with NULL dev->driver 

Compiling the code from here: http://rhlinux.redhat.com/kudzu/ I get the same
segfault.

I think there is a missing 'else' in hwconf.c.

Just more context:

-booted into Fedora 8 i686 Developer Spin
-tested that sound worked
-installed to disk
-booted from disk == kudzu segfaulting
-running from command-line == kudzu segfaulting
-sound not working because of incompletly configured sound card (PCM device
missing) - side effects is that a bunch of apps that depend on sound were crashing!
-compiled and patched (see comment #12)
-compiled kudzu runs ok
-reboot
-original kudzu does not segfault anymore, sound works

I think that somewhere at the disk installation from the live dvd the
/etc/modprobe.conf got broken into a format that made dev->drive NULL thus
triggering the segfault.  Once I fixed that, kudzu runs ok (probably because
modprobe.conf is corrected). 

Sadly, I did not keep the original modprobe.conf so if someone else gets this
bug, please upload your modprobe.conf

Created attachment 291003 [details]
patch for this issue

Ricky - thanks for the debugging. Here's what I'm committing.

kudzu-1.2.79.2-1 has been pushed to the Fedora 8 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update kudzu'

kudzu-1.2.79.2-1 has been pushed to the Fedora 8 stable repository.  If problems still persist, please make note of it in this bug report.