On 10.10.2012 00:36, Guy Helmer wrote:
On Oct 8, 2012, at 8:09 AM, Guy Helmer <guy.hel...@gmail.com> wrote:
I'm seeing a consistent new kernel panic in FreeBSD 8.3:
I'm not seeing how bd_sbuf would be NULL here. Any ideas?
Since I've not had any replies, I hope nobody minds if I reply with more
information.
This panic seems to be occasionally triggered now that my user land code is
changing the packet filter a while after the bpd device has been opened and an
initial packet filter was set (previously, my code did not change the filter
after it was initially set).
I'm focusing on bpf_setf() since that seems to be the place that could be
tickling a problem, and I see that bpf_setf() calls reset_d(d) to clear the
hold buffer. I have manually verified that the BPFD lock is held during the
call to reset_d(), and the lock is held every other place that the buffers are
manipulated, so I haven't been able to find any place that seems vulnerable to
losing one of the bpf buffers. Still searching, but any help would be
appreciated.
Can you please check this code on -current?
Locking has changed quite significantly some time ago, so there is good
chance that you can get rid of this panic (or discover different one
which is really "new") :).
Guy
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WBR, Alexander
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