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Bug#211621: marked as done (libc6: upgrade causes lwres-related breakage; sshd hangs trying to login)



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From: Rob Leslie <rob@mars.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: libc6: upgrade causes lwres-related breakage; sshd hangs trying to login
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Package: libc6
Version: 2.3.2-7
Severity: grave
Tags: sid
Justification: renders package unusable

Using an /etc/nsswitch.conf line as follows:

hosts: files lwres [!unavail=return] dns

(with the libnss-lwres 0.93-4 package installed), sshd will hang after
accepting but before authenticating a connection.

On the client side, the last bit of ssh verbosity is:

debug1: SSH2_MSG_NEWKEYS received
debug1: done: ssh_kex2.
debug1: send SSH2_MSG_SERVICE_REQUEST
debug1: service_accept: ssh-userauth
debug1: got SSH2_MSG_SERVICE_ACCEPT

On the server side, strace reports no further activity after:

[pid 25736] read(5, "\0\0\0\27", 4)     = 4
[pid 25736] read(5, "\3\0\0\0\16ssh-connection\0\0\0\0", 23) = 23
[pid 25736] read(5, "\0\0\0\5", 4)      = 4
[pid 25736] read(5, "\n\0\0\0\0", 5)    = 5
[pid 25736] time(NULL)                  = 1063936118
[pid 25736] open("/etc/nologin", O_RDONLY) = -1 ENOENT (No such file or directory)
[pid 25736] getuid32()                  = 0
[pid 25736] open("/etc/passwd", O_RDONLY) = 3
[pid 25736] fcntl64(3, F_GETFD)         = 0
[pid 25736] fcntl64(3, F_SETFD, FD_CLOEXEC) = 0
[pid 25736] _llseek(3, 0, [0], SEEK_CUR) = 0
[pid 25736] fstat64(3, {st_mode=S_IFREG|0644, st_size=1033, ...}) = 0
[pid 25736] mmap2(NULL, 1033, PROT_READ, MAP_SHARED, 3, 0) = 0x40016000
[pid 25736] _llseek(3, 1033, [1033], SEEK_SET) = 0
[pid 25736] munmap(0x40016000, 1033)    = 0
[pid 25736] close(3)                    = 0
[pid 25736] open("/etc/shadow", O_RDONLY) = 3
[pid 25736] fcntl64(3, F_GETFD)         = 0
[pid 25736] fcntl64(3, F_SETFD, FD_CLOEXEC) = 0
[pid 25736] _llseek(3, 0, [0], SEEK_CUR) = 0
[pid 25736] fstat64(3, {st_mode=S_IFREG|0640, st_size=708, ...}) = 0
[pid 25736] mmap2(NULL, 708, PROT_READ, MAP_SHARED, 3, 0) = 0x40016000
[pid 25736] _llseek(3, 708, [708], SEEK_SET) = 0
[pid 25736] munmap(0x40016000, 708)     = 0
[pid 25736] close(3)                    = 0
[pid 25736] getuid32()                  = 0
[pid 25736] geteuid32()                 = 0
[pid 25736] ioctl(0, SNDCTL_TMR_TIMEBASE, 0xbfffecc0) = -1 ENOTTY (Inappropriate ioctl for device)
[pid 25736] ioctl(0, SNDCTL_TMR_TIMEBASE, 0xbfffecb0) = -1 ENOTTY (Inappropriate ioctl for device)
[pid 25736] time([1063936118])          = 1063936118
[pid 25736] getpid()                    = 25736
[pid 25736] rt_sigprocmask(SIG_SETMASK, NULL, [RTMIN], 8) = 0
[pid 25736] rt_sigsuspend([]

This problem does not occur if /etc/nsswitch.conf is changed to:

hosts: files dns

Or if a version of libc6 prior to 2.3.2 is installed.

-- 
Rob Leslie
rob@mars.org


-- System Information:
Debian Release: testing/unstable
Architecture: i386
Kernel: Linux phobos 2.4.21-4-686-smp #1 SMP Sun Aug 3 00:31:17 EST 2003 i686
Locale: LANG=C, LC_CTYPE=C

Versions of packages libc6 depends on:
ii  libdb1-compat                 2.1.3-7    The Berkeley database routines [gl

-- no debconf information


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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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