Date: Fri, 7 Jan 2000 00:20:02 -0800 (PST) From: Terry Kennedy <terry@tmk.com> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/10872: Panic in soreceive() due to NULL mbuf pointer Message-ID: <200001070820.AAA89728@freefall.freebsd.org>
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The following reply was made to PR kern/10872; it has been noted by GNATS. From: Terry Kennedy <terry@tmk.com> To: Bosko Milekic <bmilekic@dsuper.net> Cc: freebsd-gnats-submit@freebsd.org Subject: Re: kern/10872: Panic in soreceive() due to NULL mbuf pointer Date: Fri, 07 Jan 2000 03:06:33 -0500 (EST) > Hmmm, judging from your original post, I thought that what you were > receiving in tulip_rx_intr() was a page fault? Yes. A trap 12 from a memory reference inside MCLGET. > In any case, at the time this was occuring, `netstat -m' could > display `peak' for mbuf _clusters_ greater than the actual `max.' No, this was definitely mbufs, not mbuf clusters. As I said, this could be an error in the netstat code (the 4BSD code tends to use kerninfo even when it thinks it is looking at a corefile - I haven't looked at the cur- rent FreeBSD code to see if it's been fixed). > As for the sbdrop() issue, that, I believe, is a whole other story. I > think, at this point, that the problem is fairly isolated in the > uipc_socket2.c code, and has not-so-much to do with the fxp driver, in > particular, but that it occurs more as a `side-effect' of some > timing-related issue. I'd prefer to keep searching until I figure it out > before claiming anything, though. The biggest problem that I have at this > end is that due to lack of hardware, I cannot reproduce it. Ok. Someone else has appended to this PR that they have code that can trigger the bug pretty much at will on 3.4-RELEASE, so hopefully that will provide enough info. If nobody else has the hardware to test this, I can put up a test box if I get that code, and then I can make the box and the crash dumps available to folks. I just can't clobber my production system 8-) Terry Kennedy http://www.tmk.com terry@tmk.com Jersey City, NJ USA +1 201 451 4554 (voice) +1 201 451 0900 (FAX) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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