Date: Fri, 31 May 2013 19:25:23 +0200 From: Andre Albsmeier <Andre.Albsmeier@siemens.com> To: John Baldwin <jhb@freebsd.org> Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org> Subject: Re: FreeBSD-9.1: machine reboots during snapshot creation, LORs found Message-ID: <20130531172523.GA9188@bali> In-Reply-To: <201305311051.03157.jhb@freebsd.org> References: <20130531122611.GA6607@bali> <201305311051.03157.jhb@freebsd.org>
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On Fri, 31-May-2013 at 16:51:03 +0200, John Baldwin wrote: > On Friday, May 31, 2013 8:26:11 am Andre Albsmeier wrote: > > Each day at 5:15 we are generating snapshots on various machines. > > This used to work perfectly under 7-STABLE for years but since > > we started to use 9.1-STABLE the machine reboots in about 10% > > of all cases. > > > > After rebooting we find a new snapshot file which is a bit > > smaller than the good ones and with different permissions > > It does not succeed a fsck. In this example it is the one > > whose name is beginning with s3: > > > > -r--r----- 1 root operator snapshot 72802894528 29 May 05:15 s2-2013.05.28-03.15.04 > > -r-------- 1 root operator snapshot 72802893824 29 May 05:15 s3-2013.05.29-03.15.03 > > -r--r----- 1 root operator snapshot 72802894528 28 May 14:22 s4-2013.05.23-06.38.44 > > -r--r----- 1 root operator snapshot 72802894528 28 May 14:22 s5-2013.05.24-03.15.03 > > -r--r----- 1 root operator snapshot 72802894528 28 May 14:22 s6-2013.05.25-03.15.03 > > > > After enabling DIAGNOSTIC, WITNESS and INVARIANTS in the kernel > > I see the following LORs (mksnap_ffs starts exactly at 5:15): > > > > May 29 05:15:00 <kern.crit> palveli kernel: lock order reversal: > > May 29 05:15:00 <kern.crit> palveli kernel: 1st 0xc2371da8 ufs (ufs) @ /src/src-9/sys/kern/vfs_mount.c:1240 > > May 29 05:15:00 <kern.crit> palveli kernel: 2nd 0xc2371ec4 devfs (devfs) @ /src/src-9/sys/ufs/ffs/ffs_vfsops.c:1414 > > May 29 05:15:04 <kern.crit> palveli kernel: lock order reversal: > > May 29 05:15:04 <kern.crit> palveli kernel: 1st 0xc228471c snaplk (snaplk) @ /src/src-9/sys/ufs/ufs/ufs_vnops.c:976 > > May 29 05:15:04 <kern.crit> palveli kernel: 2nd 0xc22f25e4 ufs (ufs) @ /src/src-9/sys/ufs/ffs/ffs_snapshot.c:1626 > > > > Unfortunatley no corefiles are being generated ;-(. > > > > I have checked and even rebuilt the (UFS1) fs in question > > from scratch. I have also seen this happen on an UFS2 on > > another machine and on a third one when running "dump -L" > > on a root fs. > > > > Any hints of how to proceed? > > Would it be possible to setup a serial console that is logged on this machine > to see if it is panic'ing but failing to write out a crashdump? I'll try to arrange that. It'll take a bit since this box is 200 km away... Maybe I'll find another one nearby to reproduce it... -Andre -- This email has been checked as virus-free. It may still be full of nonsense however.
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