From: Michael Hase (michael@six.de)
Date: Wed May 21 2003 - 15:07:07 EDT
thanks to:
Lieven Marchand
Casper Dik
Yakov Lerner
Jonathan V Hays
Question was:
> our e250/solaris 7 suddenly refuses rlogin and telnet logins, fortunately
> ssh and console logins work ok. Every other service like databases, samba,
> apache, nfs is also ok. It just seems that the in.telnetd or in.rlogind
> processes are hanging.
> ...
> It just seems to hang after writing to /etc/initpipe
Answer:
There were suggestions to do the following:
check if / is mounted ro (was ok, that is: mounted rw)
check if fuser /etc/initpipe returns 1o (was ok)
try to change runlevel (could have helped, didn't try)
truss init itself (it did nothing when telnetting in)
kill -HUP 1 (which did not help)
check if dns is ok (problem not related to dns)
After all I stumbled over the size of /etc/initpipe, it was 9k. A
cat /etc/initpipe > /dev/null
emptied this fifo, and rlogin and telnet worked again. Each login
added 8 bytes to initpipe, so we could expect the same problem if the
pipe buffer got filled again. init simply did not fetch data from
/etc/initpipe anymore.
After a reboot some minutes ago everything works ok, and initpipe is
empty as it should. The second problem (sendmail[24580]: ypbind client:
can't get rdev) is probably not related to the init problem. After reboot
this is gone too. And fstat on /dev/tcp doesn't return an error anymore.
Original post follows:
> Hello,
>
> our e250/solaris 7 suddenly refuses rlogin and telnet logins, fortunately
> ssh and console logins work ok. Every other service like databases, samba,
> apache, nfs is also ok. It just seems that the in.telnetd or in.rlogind
> processes are hanging.
>
> Here's the output of a telnet session
>
> telnet xxxxx.six.de
> Trying xx.xx.xx.xx...
> Connected to xxxxx.six.de.
> Escape character is '^]'.
>
>
> SunOS 5.7
>
> After that nothing happens. in.telnetd is running, but there is no login
> prompt. The same with rlogin. Here is the end of truss output on inetd
> when such an rlogin session starts:
>
> 24492: write(6, " . r l o g i n\0\0\0\0\0".., 372) = 372
> 24488: sigaction(SIGCLD, 0xFFBEF980, 0xFFBEFA20) = 0
> 24492: lseek(7, 2520, SEEK_SET) = 2520
> 24488: sigprocmask(SIG_UNBLOCK, 0xFFBEFA50, 0xFFBEFA40) = 0
> 24492: write(7, " . r l o g i n\0 r P 0 0".., 36) = 36
> 24488: setpgrp() = 24488
> 24492: open("/var/adm/wtmp", O_WRONLY|O_APPEND) = 8
> 24488: sigaction(SIGTTOU, 0xFFBEF880, 0xFFBEF920) = 0
> 24492: open("/var/adm/wtmpx", O_WRONLY|O_APPEND) = 9
> 24488: sigprocmask(SIG_UNBLOCK, 0xFFBEF950, 0xFFBEF940) = 0
> 24492: lseek(8, 0, SEEK_END) = 5615244
> 24488: putmsg(0, 0xFFBEF94C, 0xFFBEF940, 0) = 0
> 24492: lseek(9, 0, SEEK_END) = 0x03755CA0
> 24492: write(8, " . r l o g i n\0 r P 0 0".., 36) = 36
> 24492: write(9, " . r l o g i n\0\0\0\0\0".., 372) = 372
> 24488: open("/dev/logindmux", O_RDWR) = 5
> 24492: close(8) = 0
> 24492: close(9) = 0
> 24488: open("/dev/logindmux", O_RDWR) = 6
> 24492: fcntl(6, F_SETLK, 0xFFBEF974) = 0
> 24492: fcntl(7, F_SETLK, 0xFFBEF974) = 0
> 24492: close(6) = 0
> 24488: ioctl(5, I_LINK, 4) = 3241
> 24492: close(7) = 0
> 24492: open("/etc/initpipe", O_RDWR) = 6
> 24488: ioctl(6, I_LINK, 0) = 3242
> 24488: fstat(5, 0xFFBEF9D8) = 0
> 24488: ioctl(6, I_STR, 0xFFBEF9C0) = 0
> 24488: fstat(6, 0xFFBEF9D8) = 0
> 24488: ioctl(5, I_STR, 0xFFBEF9C0) = 0
> 24488: ioctl(6, I_STR, 0xFFBEF9C0) = 0
> 24247: poll(0xFFBEF578, 49, -1) (sleeping...)
> 24492: write(6, "\0\0\001\0\0 _AC", 8) (sleeping...)
> 24488: pause() (sleeping...)
>
> It just seems to hang after writing to /etc/initpipe
>
> I first thought if this could be related to syslog entries like
> sendmail[24580]: ypbind client: can't get rdev
> Bug ID 4209076 on sunsolve says that this is a problem with 32bit apps
> running on a 64bit kernel. We indeed get EOVERFLOW when trying to fstat
> eg /dev/tcp, /dev/udp, /dev/arp from a 32bit test program. Could there be
> any relation to the problem above? In this case a reboot would help (after
> 196 days uptime).
>
> Any suggestions?
>
> Thanks,
> Michael
>
>
Thanks again,
Michael
-- i.A. Michael Hase Six Offene Systeme GmbH michael@six.de Sielminger Str. 63 http://www.six.de 70771 Leinfelden-Echterdingen phone +49 711 99091 62 Germany _______________________________________________ sunmanagers mailing list sunmanagers@sunmanagers.org http://www.sunmanagers.org/mailman/listinfo/sunmanagers
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