Date: Tue, 1 Oct 2019 15:46:40 +0530 From: Reshad Patuck <reshadpatuck1@gmail.com> To: Julien Cigar <julien@perdition.city> Cc: FreeBSD FS <freebsd-fs@freebsd.org> Subject: Re: [zfs] filesystem reads hanging Message-ID: <CADaJeD2JNwdd=_6_Pdp1YUgEdD6f0V%2B5U6bUk%2BoKzx_MmXs0ow@mail.gmail.com> In-Reply-To: <20191001082837.GF49734@home.lan> References: <CADaJeD24HV0eW7nQT9jaQwEWp=1f4J2WL3OOLZiv--v1zyepwQ@mail.gmail.com> <20191001082837.GF49734@home.lan>
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Hi Julien, I did come across that one an hour or so back, can you let me know if there is any way to confirm that it is the same issue I am running up against. The command `procstat -kka` does have very similar (and in some cases identical) output to the lines in the PR mentioned. Unfortunately I need to stick to 12.0 till 12.1 is out, any idea if I can merge the same change into 12.0 and compile it? I can see the changes in the 12.1 branch, just wondering if I should jump to the beta or wait it out if I cant compile it into 12.0. Thanks for your help, Reshad On Tue, Oct 1, 2019 at 1:58 PM Julien Cigar <julien@perdition.city> wrote: > On Tue, Oct 01, 2019 at 10:26:32AM +0530, Reshad Patuck wrote: > > Hi, > > Hello, > > > > > I have a FreeBSD 12.0-RELEASE-p9 system running ZFS. > > The system runs an application that uses postgres, and python (among > other > > services). > > > > I have noticed that python suddenly is not able to connect to postgres. > > When I try to investigate further, certain files on disk can not be read. > > The commands `cat` and `ls -l` hang (no output and I can not ctrl-c or > kill > > -9 them), ps -aux shows them in a D+ state. > > On killing the SSH session these processes continue running in orphans, I > > am not able to kill them. > > > > Someone on IRC suggested running a zfs scrub to check for data > corruption, > > but running `zpool scrub zroot` has the same effect. > > The command does not return, ctrl-c does not kill it and `zpool scrub -s > > zroot` says "cannot cancel scrubbing zroot: there is no active scrub". > > > > This has happened in the past 1 month to two of my production servers and > > since the application was critical they were rebooted and the boxes > > function as normal after the reboot. > > Files that were not cat-able on the production servers were working fine > > and a zfs scrub worked fine to show 0 errors and 0 fixes. > > One of these boxes needed a hard reboot as it got stuck in the shutting > > down stage of a soft reboot. > > > > I am not sure where to start debugging this or if there are any ways to > get > > metrics on a box stuck in this state. > > Please let me know if you would like me to fetch any metrics or run and > > commands, etc. for you. > > Any help would be much appreciated. > > This is a known problem (see PR 236220) and has been fixed by r350894 > (and MFC-ed into 12-STABLE, so I guess it should be in the upcoming > 12.1-RELEASE) > > > > > Best regards, > > > > Reshad > > _______________________________________________ > > freebsd-fs@freebsd.org mailing list > > https://lists.freebsd.org/mailman/listinfo/freebsd-fs > > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" > > -- > Julien Cigar > Belgian Biodiversity Platform (http://www.biodiversity.be) > PGP fingerprint: EEF9 F697 4B68 D275 7B11 6A25 B2BB 3710 A204 23C0 > No trees were killed in the creation of this message. > However, many electrons were terribly inconvenienced. >
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