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Re: [Linux-cluster] gfs2 blocking tasks



Hi,

On Tue, 2012-08-21 at 12:39 +0200, Bart Verwilst wrote:
> Hi Steven
> 
> Shared storage is iSCSI,
> 
> <totem rrp_mode="none" secauth="off" token="20000"/>
> <quorumd tko="4" interval="2" 
> device="/dev/mapper/iscsi_cluster_quorum"></quorumd>
> 
> Actually i know why this is happening now, and can reproduce 100% of 
> the time, i've added my findings as a comment to this bug from somebody 
> having the same problem:
> 
> https://bugs.launchpad.net/ubuntu/+source/gfs2-utils/+bug/1020207
> 
> Create file on one node's gfs2 mount, rm on the other -> hanging 
> mountpoint + kernel OOPS.
> 
> Happy that i'm finally getting somewhere with this :P
> 
> Anything i can do to help Steven?
> 
> Kind regards,
> 
> Bart Verwilst
> 
Can you reproduce this without drbd in the mix? That should remove one
complication and make this easier to track down.

I'll take a look at see what that dereference is likely to be in the
mean time,

Steve.

> Steven Whitehouse schreef op 21.08.2012 12:17:
> > Hi,
> >
> > On Tue, 2012-08-21 at 12:08 +0200, Bart Verwilst wrote:
> >> As yet another reply to my own post, i found this on the node where 
> >> it
> >> hangs ( this time it's vm01, and /var/lib/libvirt/sanlock that's 
> >> hanging
> >> ):
> >>
> >>
> >> [ 1219.640653] GFS2: fsid=: Trying to join cluster "lock_dlm",
> >> "kvm:sanlock"
> >> [ 1219.660035] GFS2: fsid=kvm:sanlock.0: Joined cluster. Now 
> >> mounting
> >> FS...
> >> [ 1219.720108] GFS2: fsid=kvm:sanlock.0: jid=0, already locked for 
> >> use
> >> [ 1219.720113] GFS2: fsid=kvm:sanlock.0: jid=0: Looking at 
> >> journal...
> >> [ 1219.772606] GFS2: fsid=kvm:sanlock.0: jid=0: Acquiring the
> >> transaction lock...
> >> [ 1219.772659] GFS2: fsid=kvm:sanlock.0: jid=0: Replaying journal...
> >> [ 1219.772675] GFS2: fsid=kvm:sanlock.0: jid=0: Replayed 0 of 0 
> >> blocks
> >> [ 1219.772679] GFS2: fsid=kvm:sanlock.0: jid=0: Found 1 revoke tags
> >> [ 1219.782611] init: libvirt-bin main process ended, respawning
> >> [ 1219.784161] GFS2: fsid=kvm:sanlock.0: jid=0: Journal replayed in 
> >> 1s
> >> [ 1219.784268] GFS2: fsid=kvm:sanlock.0: jid=0: Done
> >> [ 1219.784329] GFS2: fsid=kvm:sanlock.0: jid=1: Trying to acquire
> >> journal lock...
> >> [ 1219.788349] GFS2: fsid=kvm:sanlock.0: jid=1: Looking at 
> >> journal...
> >> [ 1219.886047] GFS2: fsid=kvm:sanlock.0: jid=1: Done
> >> [ 1219.886110] GFS2: fsid=kvm:sanlock.0: jid=2: Trying to acquire
> >> journal lock...
> >> [ 1219.891121] GFS2: fsid=kvm:sanlock.0: jid=2: Looking at 
> >> journal...
> >> [ 1219.943994] init: ttyS1 main process (20318) terminated with 
> >> status
> >> 1
> >> [ 1219.944037] init: ttyS1 main process ended, respawning
> >> [ 1219.967054] init: ttyS0 main process (20320) terminated with 
> >> status
> >> 1
> >> [ 1219.967100] init: ttyS0 main process ended, respawning
> >> [ 1219.972037] ttyS0: LSR safety check engaged!
> >> [ 1220.226027] GFS2: fsid=kvm:sanlock.0: jid=2: Acquiring the
> >> transaction lock...
> >> [ 1220.226160] GFS2: fsid=kvm:sanlock.0: jid=2: Replaying journal...
> >> [ 1220.311801] GFS2: fsid=kvm:sanlock.0: jid=2: Replayed 3 of 106
> >> blocks
> >> [ 1220.311805] GFS2: fsid=kvm:sanlock.0: jid=2: Found 4487 revoke 
> >> tags
> >> [ 1220.322148] GFS2: fsid=kvm:sanlock.0: jid=2: Journal replayed in 
> >> 1s
> >> [ 1220.322253] GFS2: fsid=kvm:sanlock.0: jid=2: Done
> >
> > So that looks like it successfully recovered the journals for nodes 
> > one
> > and two. How many nodes are in the cluster? What is the fencing 
> > quorum
> > set up being used?
> >
> >> [ 1221.457120] BUG: unable to handle kernel NULL pointer dereference 
> >> at
> >> 0000000000000018
> >
> > So this is a dereference of something which is 24 bytes into some
> > structure or other. Certainly something which should not happen so we
> > need to take a look at that.
> >
> > Was this a one off, or something that you can reproduce?
> >
> > Steve.
> >
> >
> >> [ 1221.457508] IP: [<ffffffffa04f800a>] gfs2_unlink+0x8a/0x220 
> >> [gfs2]
> >> [ 1221.457958] PGD 2170f2067 PUD 20c0ff067 PMD 0
> >> [ 1221.458197] Oops: 0000 [#1] SMP
> >> [ 1221.458374] CPU 0
> >> [ 1221.458460] Modules linked in: gfs2 dlm ipmi_si mptctl mptbase
> >> ipmi_devintf ipmi_msghandler dell_rbu ip6table_filter ip6_tables
> >> iptable_filter ip_tables ebtable_nat ebtables x_tables kvm_intel kvm
> >> ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodemanager 
> >> ocfs2_stackglue
> >> configfs dm_round_robin ib_iser bridge rdma_cm ib_cm iw_cm ib_sa 
> >> ib_mad
> >> ib_core ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi
> >> bonding nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc 8021q garp 
> >> stp
> >> joydev dm_multipath dcdbas mac_hid i7core_edac edac_core
> >> acpi_power_meter lp parport usbhid hid bnx2 mpt2sas 
> >> scsi_transport_sas
> >> e1000e raid_class scsi_dh_rdac usb_storage [last unloaded: ipmi_si]
> >> [ 1221.463058]
> >> [ 1221.463146] Pid: 20611, comm: libvirtd Not tainted 
> >> 3.2.0-26-generic
> >> #41-Ubuntu Dell Inc. PowerEdge R310/05XKKK
> >> [ 1221.463626] RIP: 0010:[<ffffffffa04f800a>]  [<ffffffffa04f800a>]
> >> gfs2_unlink+0x8a/0x220 [gfs2]
> >> [ 1221.464100] RSP: 0018:ffff88020cfe1d28  EFLAGS: 00010296
> >> [ 1221.464344] RAX: 0000000000000000 RBX: ffff88021ef58000 RCX:
> >> ffff88020cfe1d40
> >> [ 1221.464662] RDX: 0000000000000000 RSI: 00000000000183f3 RDI:
> >> ffff88022efa2440
> >> [ 1221.464979] RBP: ffff88020cfe1e38 R08: 4000000000000000 R09:
> >> 0000000000000000
> >> [ 1221.465297] R10: fdd50265775f720a R11: 0000000000000003 R12:
> >> ffff88021ef50000
> >> [ 1221.465615] R13: ffff88020cfe1d80 R14: ffff8802178980c0 R15:
> >> ffff88022efa2000
> >> [ 1221.466115] FS:  00007f4d2c0e7700(0000) GS:ffff880237200000(0000)
> >> knlGS:0000000000000000
> >> [ 1221.466487] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> >> [ 1221.466748] CR2: 0000000000000018 CR3: 00000002175e4000 CR4:
> >> 00000000000006f0
> >> [ 1221.467066] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> >> 0000000000000000
> >> [ 1221.467384] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
> >> 0000000000000400
> >> [ 1221.467702] Process libvirtd (pid: 20611, threadinfo
> >> ffff88020cfe0000, task ffff8802241cdbc0)
> >> [ 1221.468091] Stack:
> >> [ 1221.468199]  0000000000000003 ffff88022f108048 ffff88020cfe1d58
> >> ffff88020cfe1d40
> >> [ 1221.468581]  ffff88020cfe1d40 ffff88022f108000 ffff88022354aa00
> >> 0000000000000001
> >> [ 1221.468963]  0000000000000000 0000000000000000 ffffffffa04f7fda
> >> ffff88020cfe1d80
> >> [ 1221.469346] Call Trace:
> >> [ 1221.469486]  [<ffffffffa04f7fda>] ? gfs2_unlink+0x5a/0x220 [gfs2]
> >> [ 1221.469955]  [<ffffffffa04f7ff4>] ? gfs2_unlink+0x74/0x220 [gfs2]
> >> [ 1221.470236]  [<ffffffff8129cb2c>] ?
> >> security_inode_permission+0x1c/0x30
> >> [ 1221.470536]  [<ffffffff81184e70>] vfs_unlink.part.26+0x80/0xf0
> >> [ 1221.470802]  [<ffffffff81184f1c>] vfs_unlink+0x3c/0x60
> >> [ 1221.471040]  [<ffffffff8118758a>] do_unlinkat+0x1aa/0x1d0
> >> [ 1221.471290]  [<ffffffff81177fc0>] ? vfs_write+0x110/0x180
> >> [ 1221.471538]  [<ffffffff811782a7>] ? sys_write+0x67/0x90
> >> [ 1221.471780]  [<ffffffff81188106>] sys_unlink+0x16/0x20
> >> [ 1221.472019]  [<ffffffff81661fc2>] system_call_fastpath+0x16/0x1b
> >> [ 1221.472290] Code: 00 00 49 83 c5 40 31 d2 4c 89 e9 be 01 00 00 00 
> >> e8
> >> fc 1e ff ff 48 8b b3 28 02 00 00 4c 89 ff e8 ad 7e 00 00 48 8d 8d 08 
> >> ff
> >> ff ff <48> 8b 78 18 31 d2 be 01 00 00 00 48 83 e9 80 e8 d2 1e ff ff 
> >> 48
> >> [ 1221.473936] RIP  [<ffffffffa04f800a>] gfs2_unlink+0x8a/0x220 
> >> [gfs2]
> >> [ 1221.474240]  RSP <ffff88020cfe1d28>
> >> [ 1221.474408] CR2: 0000000000000018
> >> [ 1221.474959] ---[ end trace f7df780fd45600a8 ]---
> >>
> >>
> >> Bart Verwilst schreef op 20.08.2012 09:50:
> >> > Nothing out of the ordinary, should have mentioned that!
> >> >
> >> > <snip>
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] daemon: read 
> >> 20
> >> > bytes from fd 17
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] daemon: 
> >> client
> >> > command is 7
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] daemon: About 
> >> to
> >> > process command
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] memb: command 
> >> to
> >> > process is 7
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] memb:
> >> > get_all_members: allocated new buffer (retsize=1024)
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] memb:
> >> > get_all_members: retlen = 1760
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] memb: command
> >> > return code is 4
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] daemon:
> >> > Returning command data. length = 1760
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] daemon: 
> >> sending
> >> > reply 40000007 to fd 17
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] daemon: read 
> >> 20
> >> > bytes from fd 17
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] daemon: 
> >> client
> >> > command is 800000b7
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] daemon: About 
> >> to
> >> > process command
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] memb: command 
> >> to
> >> > process is 800000b7
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] memb: command
> >> > return code is 0
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] daemon:
> >> > Returning command data. length = 0
> >> > Aug 19 00:08:00 vm02-test corosync[7394]:   [CMAN  ] daemon: 
> >> sending
> >> > reply c00000b7 to fd 17
> >> > Aug 19 00:08:01 vm02-test corosync[7394]:   [CMAN  ] daemon: read 
> >> 20
> >> > bytes from fd 17
> >> > Aug 19 00:08:01 vm02-test corosync[7394]:   [CMAN  ] daemon: 
> >> client
> >> > command is 7
> >> > Aug 19 00:08:01 vm02-test corosync[7394]:   [CMAN  ] daemon: About 
> >> to
> >> > process command
> >> > </snip>
> >> >
> >> > Digimer schreef op 20.08.2012 00:01:
> >> >> On 08/19/2012 05:34 PM, Bart Verwilst wrote:
> >> >>> Aug 19 00:10:01 vm02-test kernel: [282120.240067] INFO: task
> >> >>> kworker/1:0:3117 blocked for more than 120 seconds.
> >> >>> Aug 19 00:10:01 vm02-test kernel: [282120.240182] "echo 0 >
> >> >>> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> >> >>
> >> >> Nothing around Aug 19 00:08:00 ?
> >>
> >> --
> >> Linux-cluster mailing list
> >> Linux-cluster redhat com
> >> https://www.redhat.com/mailman/listinfo/linux-cluster
> 



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