Date: Fri, 14 Jun 2019 10:20:18 -0700 From: David Wolfskill <david@catwhisker.org> To: Peter <pmc@citylink.dinoex.sub.org> Cc: freebsd-ipfw@freebsd.org Subject: Re: ipfw: switching sets does stall the machine Message-ID: <20190614172018.GJ1219@albert.catwhisker.org> In-Reply-To: <20190614153302.GA4503@gate.oper.dinoex.org>
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[-- Attachment #1 --] On Fri, Jun 14, 2019 at 05:33:02PM +0200, Peter wrote: > > Hi, > I am trying to use two different configurations (production and test) > loaded into different sets, and switch between them with > > # ipfw set disable ... enable ... > > When testing my script, this did work, except once the machine went > into "swap_pager indefinite wait" and was lost. IIRC, this message means that a command was sent to a disk controller and at least 20 seconds have elapsed with no response from that controller. That doesn't seem like an "ipfw" issue, per se. > Then, after reboot (and automatically loading the production rules) I > tried to load and switch to the test rules, and immediately got ATA > COMMAND TIMEOUT and the machine was lost. Again, that's a disk subsystem (apparently) doing Bad Things. > I repeated this a few times, it is nicely reproducible: withing 3-5 > seconds after the new rules are loaded, the machine locks up and is > lost. It's at least plausible that the catalyzing activity causes a certain disk I/O pattern that does the actual triggering (I expect). > I analyzed more closely by running "top -HPS" in rtprio, and found > this: > * loading the rules is no problem. > * when switching sets, the command returns, but then within few > seconds the machine gets unresponsive and stays so until watchdog > hits. > * The last thing seen in "top" (before it freezes) is this thread > eating 85% CPU (and running with high priority): > [irq12: uhci0 uhci1] > > > It there a known workaround? > .... My inclination is for you to check the disk drive(s), cabling, and controller(s) before much else. Peace, david -- David H. Wolfskill david@catwhisker.org Donald Trump advocated for the executions of five factually innocent young men. See http://www.catwhisker.org/~david/publickey.gpg for my public key. [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- iQGTBAEBCgB9FiEE4owz2QxMJyaxAefyQLJg+bY2PckFAl0D11JfFIAAAAAALgAo aXNzdWVyLWZwckBub3RhdGlvbnMub3BlbnBncC5maWZ0aGhvcnNlbWFuLm5ldEUy OEMzM0Q5MEM0QzI3MjZCMTAxRTdGMjQwQjI2MEY5QjYzNjNEQzkACgkQQLJg+bY2 PckdEAf/YPtQtyqdxNIwBqabwEylzTYmbDvzIBb3NfznVA8rAoYovhuuhbjm+c/N XYwT8bo9k4WAMHkIWTzs7Qy18x3VkgmTTwAztaR5+DVT1e98bJ9KWoZSlwUsKygM L3oyFgs84uS713xn/pTXLVHDgRj2dhN6l2hMNwj/3fgzqUVf1ONy0STl0Vano2hE 5x9gBTIZYfBQpDkkeeUfZJP/gqntYRirXisFdZvDvtvKzAr9O0ZP1eVy/0Vu4vqi y/qtFpJRv2erJDJQ5YQ+AyBJHjQDQnjmsNFPYP8ThDr67PKgosZdvrS6ZSj8ahZL 50eLntfnhcRQWrJPdam/OwyFbjlM1A== =28XJ -----END PGP SIGNATURE-----help
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