From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ric Wheeler Subject: Re: Hang running fs_mark Date: Thu, 25 Sep 2008 16:37:39 -0400 Message-ID: <48DBF693.20501@redhat.com> References: <20080925175643.GA14205@unused.rdu.redhat.com> <1222367822.7028.55.camel@think.oraclecorp.com> <20080925183435.GB14205@unused.rdu.redhat.com> <1222369531.7028.58.camel@think.oraclecorp.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Cc: Josef Bacik , linux-btrfs@vger.kernel.org To: Chris Mason Return-path: In-Reply-To: <1222369531.7028.58.camel@think.oraclecorp.com> List-ID: Chris Mason wrote: > On Thu, 2008-09-25 at 14:34 -0400, Josef Bacik wrote: > >> On Thu, Sep 25, 2008 at 02:37:02PM -0400, Chris Mason wrote: >> >>> On Thu, 2008-09-25 at 13:56 -0400, Josef Bacik wrote: >>> >>>> Hello, >>>> >>>> Reporting this on behalf of ric. He was running the following fs_mark command >>>> >>>> ./fs_mark -d /mnt/test -s 20480 -D 64 -t 8 -F >>>> >>>> Seems it hung and wasn't making any progress. He managed to get some sysrq-t, >>>> which is at http://people.redhat.com/jwhiter/fs-mark-hang.txt towards the bottom >>>> of the document. He could ctrl+c and unmount the fs so its not a hard hang. >>>> Looks like we've just locked up behind a page lock somewhere. I have to run off >>>> to class so I can't look into it too deeply so throwing this out there hoping >>>> somebody else figures it out :). Thanks, >>>> >>> Which kernel was this? >>> > > >> Its 2.6.25.14-108.fc9.x86_64 and its kernel-unstable since yesterday I think he >> said, its just shy whatever patches you've pushed into git recently, it has >> yan's backref work plus a few other fixes. Thanks, >> >> > > Well, the trace is strange because it looks like everyone is waiting on > IO. Any chance once of the procs was spinning in system time? > > -chris > > It actually cleaned up very nicely after I killed the fs_mark processes & unmounted the btrfs file system. Before doing that, the box was sluggish and had the feeling of a system with something that might have been spinning (but that is just an observation, not measured in any strict sense). ric