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PR/44196 CVS commit: src/tests/net/bpf

The following reply was made to PR kern/44196; it has been noted by GNATS.

From: "Antti Kantee" <>
Subject: PR/44196 CVS commit: src/tests/net/bpf
Date: Mon, 6 Dec 2010 11:32:01 +0000

 Module Name:   src
 Committed By:  pooka
 Date:          Mon Dec  6 11:32:01 UTC 2010
 Modified Files:
        src/tests/net/bpf: Makefile
 Added Files:
        src/tests/net/bpf: t_bpf.c
 Log Message:
 Add an xfail test for the mbuf leak described in PR kern/44196.
 This is yet another example of a simple test which would be much
 trickier to execute against the host kernel.  You would either need
 to put networking in a complete lockdown, or do some "statistical"
 methods where you trigger the bug many many times and attempt to
 ascertain a rising trend in mbuf count.  And, of course, the leaked
 mbufs don't go away from the host kernel once the test ends.  In
 contrast, we *know* that there is no other networking activity in
 a rump kernel, so we can execute the operation exactly once, plus
 the leaked mbuf "disappears" when the test is done.
 To generate a diff of this commit:
 cvs rdiff -u -r1.1 -r1.2 src/tests/net/bpf/Makefile
 cvs rdiff -u -r0 -r1.1 src/tests/net/bpf/t_bpf.c
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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