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Content-Type: TEXT/PLAIN; CHARSET=US-ASCII
Content-ID: <Pine.LNX.3.96.980329175704.26539C@comet.bluesky.net>
I have tried looking into this some more.
It seems that the 2.0.34-pre4 exhibits the same problem too.
I tried putting print statements in lock_super and unlock_super to see why
the process would get stuck in the wait queue for the superblock (and thus
the 'D' state for a long time).
Putting the printk statements in reduced the frequency of the problem but
I still got it to happen a few times (that leads me to believe that it's
some race condition somewhere). When I killed the httpsd process, it
locked the superblock but never unlocked it.
How could I go on from here? Is there a way to get a trace of calls to
see where the locking is taking place? (I saw the lock_super function
getting called from quite a lot of places).
Any other ideas would be welcome.
Andras Pataki
apataki@viconet.com
---------- Forwarded message ----------
Date: Wed, 25 Mar 1998 22:04:04 -0500 (EST)
From: apataki@viconet.com
To: linux-kernel@vger.rutgers.edu
Subject: Processes stuck in 'D' state
I have compiled and installed apache-ssl 1.2.5.
It runs ok, but when I try to kill the main process, it gets stuck in the
'D' state. ps -l shows something like:
FLAGS UID PID PPID PRI NI SIZE RSS WCHAN STA TTY TIME
COMMAND
100544 202 224 1 0 0 0 0 12978d DW ?
(httpsd)
System.map around 12978d looks like:
00129690 T get_fs_type
00129740 T __wait_on_super
001297d0 T sync_supers
so it seems it's in __wait_on_super.
After this, more and more processes get stuck in the 'D' state starting
with 'update' continuing with shells, etc.
I can't reboot nicely, have to hit the reset button ...
No oops or anything in syslog.
Regular apache 1.2.5 (without the ssl patches works fine).
This is completely repeatable on two different machines with different
hardware. Both have been running Linux for quite some time without
problems (2 and 4 years respectively), so I'm quite positive it's not a
hardware problem.
I tried kernels 2.0.33, 2.0.31 and 2.0.29, all give the same result.
The kernel is the same between the two machines, except different modules
are loaded (attached is the .config).
Hardware:
machine #1:
486/66, 32M RAM
3com 509 ethernet
2 IDE disks
machine #2:
P133, 64M RAM
3com 590 ethernet
Buslogic 958 UW SCSI with Seagate drive
software:
glibc 2.0.6
gcc-2.7.2.3
Any help would be appreciated. Let me know if there is any other useful
info I could post. I'm not really a good kernel hacker, but I could try
any suggestions to track down the problem.
Thanks
Andras Pataki
apataki@viconet.com
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