Date: Sun, 26 Oct 2014 18:32:40 +0100 From: Guido Falsi <madpilot@FreeBSD.org> To: Steven Hartland <killing@multiplay.co.uk>, freebsd-fs@freebsd.org Subject: Re: panic: detach with active requests on 10.1-RC3 Message-ID: <544D3038.7080901@FreeBSD.org> In-Reply-To: <544D137A.7010006@multiplay.co.uk> References: <544A538F.6060202@FreeBSD.org> <544BBB85.2020909@madpilot.net> <544BC990.4030700@madpilot.net> <544CC4D4.7040203@FreeBSD.org> <544D137A.7010006@multiplay.co.uk>
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On 10/26/14 16:30, Steven Hartland wrote: > > On 26/10/2014 09:54, Guido Falsi wrote: >> On 10/25/14 18:02, Guido Falsi wrote: >>> On 10/25/14 17:02, Guido Falsi wrote: >>>> On 10/24/14 15:26, Guido Falsi wrote: >>>>> Hi, >>>>> >>>>> I'm making some experiments with 10.1-RC3 on alix boards as hardware >>>>> using NanoBSD. >>>>> >>>>> By mounting and umounting UFS filesystems I have seen umount >>>>> constantly >>>>> hanging hard in a deadlock. I have tested on two boards with two >>>>> distinct compactflash disks with same results. This was not happening >>>>> with 10.0-RELEASE. >>>>> >>>>> I have build a 10.1-RC3 kernel with full debugging and caused the >>>>> problem to happen, I got this: >>>>> >>>>> root@qtest:~ [0]# umount /cfg >>>>> panic: detach with active requests >>>>> KDB: stack backtrace: >> [...] >>> I must admit I am out of ideas. >>> >> I bisected commits and finally found out this happens starting with >> r268815, which MFCed r268205. >> >> It is related to trim support, in fact disabling trim on the filesystm >> "fixes" it. >> >> I filed bug #194606 on bugzilla [1] to further track this issue, if >> anyone is interested. >> >> [1] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194606 > Nice work Guido, can you try the attached patch and see if that fixes it > please? It dies the same way with this patch applied. I tested applying the patch both in stable/10 at r268815 and to a fresh releng/10.1. -- Guido Falsi <madpilot@FreeBSD.org>
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