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PR/39536 CVS commit: src/sys/kern
The following reply was made to PR kern/39536; it has been noted by GNATS.
From: Juergen Hannken-Illjes <hannken%netbsd.org@localhost>
Subject: PR/39536 CVS commit: src/sys/kern
Date: Wed, 24 Sep 2008 08:19:19 +0000 (UTC)
Module Name: src
Committed By: hannken
Date: Wed Sep 24 08:19:19 UTC 2008
Resolve a race when physio_done signals completion before it tries to
free a buffer. This will fail if the buffer owner has a chance to
modify the BC_DONTFREE flag before putphysbuf() examines it.
Fix by removing get/putphysbuf() and BC_DONTFREE. Physio_done() now
has an explicit test for a buffer coming from the call of physio().
Observed by Lars Nordlund when writing a DVD with growisofs, see PR kern/39536.
Reviewed by: Jason Thorpe <thorpej%netbsd.org@localhost>
To generate a diff of this commit:
cvs rdiff -r1.87 -r1.88 src/sys/kern/kern_physio.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
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