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removed logFdAdd from logClient

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Jeff Hill
2003-07-26 00:28:30 +00:00
parent 459cdc0829
commit 4cb08f797a
1 changed files with 22 additions and 0 deletions
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RELEASE_NOTES.html
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@@ -30,6 +30,28 @@ necessary to make certain that an assert() failure does not occur if failure
status is returned, and that a proper response is made to this off-normal
situation.</p>
<h3>IP kernel deadlock vulnerability occurring when vxWorks's tNetTask calls
logMsg because of a transient mbuf starvation</h3>
<h4>Scope</h4>
<p>You must be running the logClient and logging to an iocLogServer and also
temporarily run the IOC out of network buffers.</p>
<h4>Symptoms</h4>
<p>IP kernel locks up during a transient mbuf starvation situation. No
network communication.</p>
<h4>Fix</h4>
<p>The fix was to not call logFdAdd for the log client's socket and instead
create a specialized vxWorks device driver which calls errlogPrintf for each
incoming message and then call logFdAdd for a file descriptor opened with
that device driver. The desirable functional change being errlogPrintf's
capability to discard messages when it gets behind (because of a transient
mbuf starvation situation).</p>
<h1>EPICS Release 3.13.8</h1>
<h2>Changes since 3.13.7</h2>