Date: Thu, 24 Jul 2008 13:37:21 +0100 (BST) From: Robert Watson <rwatson@FreeBSD.org> To: Mikhail Teterin <mi+mill@aldan.algebra.com> Cc: Kris Kennaway <kris@FreeBSD.org>, questions@FreeBSD.org, Jeremy Chadwick <koitsu@FreeBSD.org>, stable@FreeBSD.org Subject: Re: "sleeping without queue" ? Message-ID: <20080724133555.P63347@fledge.watson.org> In-Reply-To: <48861448.7020708@aldan.algebra.com> References: <4885F2A6.5020204@aldan.algebra.com> <4885FCE5.1060507@FreeBSD.org> <48860725.9050808@aldan.algebra.com> <20080722161958.GA11139@eos.sc1.parodius.com> <48860E8C.6050400@FreeBSD.org> <48860EF6.2040007@aldan.algebra.com> <48861284.1050706@FreeBSD.org> <48861448.7020708@aldan.algebra.com>
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On Tue, 22 Jul 2008, Mikhail Teterin wrote: > Kris Kennaway ???????(??): >> Mikhail Teterin wrote: >>> Kris Kennaway ???????(??): >>>> Well, I mean kernel backtrace. >>> Can I obtain that remotely and without restarting/panicking the box? >>> Thanks, >> kgdb on /dev/mem or procstat > root@aldan:~ (107) kgdb /boot/kernel/kernel /dev/mem > [...] > (kgdb) bt > #0 0x0000000000000000 in ?? () > Error accessing memory address 0x0: Bad address. > > Even less luck with procstat: > > root@aldan:~ (108) locate procstat > root@aldan:~ (109) procstat > procstat: ???????? ???????. > root@aldan:~ (110) man procstat > No manual entry for procstat > > I'm sorry, but you'll need to be more specific. What should I type? Thanks, Assuming you're using 7.0 or an older 7-STABLE: procstat(1) appeared after 7.0 was released, but should be there if you slide forward on 7-STABLE. You can use "procstat -k pid" to see kernel stack traces for kernel threads working on behalf of the process. Depending on the level of detail you require, you can use -kk to also list function offsets inside the kernel, but the results are a bit harder to read. Robert N M Watson Computer Laboratory University of Cambridge
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