Date: Wed, 30 Dec 2015 11:56:23 +0100 From: Florian Ermisch <florian.ermisch@alumni.tu-berlin.de> To: NGie Cooper <yaneurabeya@gmail.com> Cc: oliver.pinter@hardenedbsd.org, FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: Re: Stack backtrace on `zpool export` Message-ID: <5683B857.3070904@alumni.tu-berlin.de> In-Reply-To: <CAOtMX2j7HesuyceH-TEKqAQarLjBaMnQHejspbBN0GcgZg5dGw@mail.gmail.com> References: <5B1F1E9E-7651-4C1D-807F-A875EDEF8705@fsfe.org> <3B435E9A-F93A-407E-AB54-C7B98291269B@gmail.com> <CAOtMX2j7HesuyceH-TEKqAQarLjBaMnQHejspbBN0GcgZg5dGw@mail.gmail.com>
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On 29.12.15 21:14, Alan Somers wrote: > On Tue, Dec 29, 2015 at 12:54 PM, NGie Cooper > <yaneurabeya@gmail.com> wrote: >> >>> On Dec 29, 2015, at 11:48, Florian Ermisch <0xf10e@fsfe.org> >>> wrote: >>> >>> Hi *, >>> >>> since I've upgraded my laptop from 10.2-RELEASE to 11-CURRENT >>> (r292536, now r292755) I see this stack backtrace when a zpool >>> is exported: >>> (see https://gist.github.com/a342d0381a6b7ac8b313) >>> >>> (From /var/log/messages) >>> >>> First I've only seen this on the console at shutdown or reboot >>> (after sync I think) but later found I can reproduce it by >>> exporting a zpool. While the only pools I can trigger this >>> without a shutdown/reboot are connected via USB(3) I still see >>> it just before poweroff at shutdown when the system's root pool >>> is synced. >>> >>> When I try to export a zpool under heavy load (`make -C >>> /use/src -j 4 buildworld` on a 2 core CPU w/ HT) the system >>> locks up completely. I don't think it's related to memory >>> pressure as I haven't seen swap being used during a buildworld >>> (with 8 gigs of RAM). >>> >>> Has anyone else seen this? >> >> Please file a bug for this issue and assign it to freebsd-fs. It >> doesn’t look familiar (there might be a lock ordering issue with >> either zfs or vfs+zfs). Thanks! -NGie I've filed the bug but I don't think I can change the assignee: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=205725 As mentioned in the first comment, there might be a related issue with UFS on 10-STABLE: https://lists.freebsd.org/pipermail/freebsd-stable/2015-December/083895.html Regards, Florian > > Adding Will@. I think he was working on this LOR at one point. > -Alan
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