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Bug#205234: marked as done (libc6: vsyslog() call hangs su and login)



Your message dated Wed, 5 Nov 2003 10:32:44 -0800
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and subject line Bug#205099: Please check these bugs with the latest glibc
has caused the attached Bug report to be marked as done.

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From: "Nikita Matantsev" <nmatantsev@hotmail.com>
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Subject: libc6: vsyslog() call hangs su and login
Date: Wed, 13 Aug 2003 11:02:26 -0400
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Package: libc6
Version: 2.3.2-2

After upgrading to this version of libc6 and rebooting, su or login do not 
work anymore.
su hangs after prompting for password (or right away, if invoked as root), 
regardless of whether the '-' option is given.

I am running Debian unstable; I tried this with at least 3 or 4 kernels. For 
kernels 2.2.25, 2.4.20, 2.4.21 I was able to successfully login using GDM; 
but su hung in all of them.

When I tried booting with the 2.6.0 testing kernel in unstable, I got a 
chance to try text console login (X server wouldn't start due to its own 
issues) - I could not login through console at all - login hung as well.

I also tried downgrading the login package, but that did not make any 
difference.

I ran su using gdb and after it hung and I sent SIGINT to the process, the 
backtrace was as follows:

#0  0x401e3b88 in __pthread_sigsuspend () from /lib/libpthread.so.0
#1  0x401e3999 in __pthread_wait_for_restart_signal () from 
/lib/libpthread.so.0#2  0x401e5159 in __pthread_alt_lock () from 
/lib/libpthread.so.0
#3  0x401e24e6 in pthread_mutex_lock () from /lib/libpthread.so.0
#4  0x4011dead in vsyslog () from /lib/libc.so.6
#5  0x40180289 in _log_err () from /lib/security/pam_unix.so
#6  0x4017ead7 in pam_sm_open_session () from /lib/security/pam_unix.so
#7  0x4004c9c8 in pam_fail_delay () from /lib/libpam.so.0
#8  0x4004cb18 in _pam_dispatch () from /lib/libpam.so.0
#9  0x4004e516 in pam_open_session () from /lib/libpam.so.0
#10 0x0804a780 in ?? ()
#11 0x080568c8 in ?? ()

Googling revealed that the pthread calls look like something to do with an 
unitialized mutex, but that's just my guessing.

Downgrading libc6 to 2.3.1 fixed the problem.

This bug seems similar to bug #205099 - that one also involved a syslog call 
and a hanging process.

Cheers!

     Nick

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Received: (at 211621-done) by bugs.debian.org; 5 Nov 2003 18:33:22 +0000
>From jbailey@nisa.net Wed Nov 05 12:33:11 2003
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Date: Wed, 5 Nov 2003 10:32:44 -0800
From: Jeff Bailey <jbailey@nisa.net>
To: Juergen Kreileder <jk@blackdown.de>, 205099@bugs.debian.org
Cc: GOTO Masanori <gotom@debian.or.jp>,
        Anthony DeRobertis <asd@suespammers.org>,
        211621-submitter@bugs.debian.org, 211621-done@bugs.debian.org
Subject: Re: Bug#205099: Please check these bugs with the latest glibc
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On Wed, Nov 05, 2003 at 06:56:11PM +0100, Juergen Kreileder wrote:

> > Hmm... so could you confirm that this bug is already fixed?  These 3
> > bugs are marked as "grave", so we have to resolve ASAP.  And the
> > trouble is debian-glibc maintainers can't reproduce the reoccurrence
> > of these bugs.  I would like to close these bugs.  If you and
> > "someone" think there still exist bugs, could you tell us?  If not,
> > could I close these bugs?

> I was able to reproduce the lwres related RPC problem until a few days
> ago.  It seems to be gone now, probably got fixed by the recent glibc
> updates.

Lovely, closing 211621 then.  Thanks!

Tks,
Jeff Bailey



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