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kern/39016: processes stuck in "tstile"
>Synopsis: processes stuck in "tstile"
>Arrival-Date: Sun Jun 22 09:30:00 +0000 2008
>Originator: Alan Barrett
>Release: NetBSD 4.99.63
System: NetBSD 4.99.63
The system sometimes gets into a state such that all processes that
attempt to perform disk I/O get stuck waiting for "tstile".
Just use the system for a while.
For example, most recently, I was running X, a mail reader,
systat vm, a few idle shells, "cp -RPp" copying from one
external USB disk to anotehr, a "make" job using rsync to copy
from an external machine to the local machine, and a recursive
"chown". I noticed that the window manager's clock had stopped
updating. Upon further investigation, I noticed:
* The window manager's clock display had frozen;
* The external USB disks were still busy;
* The systat display had frozen;
* Pressing enter in an idle shell still worked;
* Attempting to run any new command hung forever;
* The "make" job that was synchronising from an external machine
had printed a message saying that it was performing a "rm" command
to delete a lock file, but then appeared to be stuck;
* Pressing alt-control-F1 to get to the primary console worked;
* Pressing alt-control-escape to get into DDB worked;
* Inside ddb, the "ps" and "ps /w" commands indicated that many
processes were waiting for "tstile";
* One of the stuck processes was "rm", which I presume was the
command invoked from the make job menjioned above;
* The ddb "c" command worked;
* At the login prompt on the primary console, typing a username and
pressing enter caused the "login" proess to get stuck waiting
for "tstile" (or perhaps it was the "getty" process that was stuck,
I am not certain);
* the ddb "sync" command caused the machine to freeze, requiring
a power cycle.
Prior to this event, I had noticed from the "systat bufcache"
display that there was no free memory; most memory was in use by
cached file system data.
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