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[Linux-cluster] Cluster rejoin problem - 4U3, two node cluster


I've come across a problem with two-node cluster on RHEL 4U3.  When I
attempt to reboot one of the nodes, it sometimes fails to leave
cluster correctly.

Before reboot, both nodes are cluster members and it is possible to
fail-over services from one node to another.  When I try to reboot
node1 (active at that time), services fail-over to node2, however,
cman fails to stop correctly:

cman: Stopping cman:
cman: failed to stop cman failed

node2 logs following message:

kernel: CMAN: removing node node1 from the cluster : Missed too many heartbeats

I see no information about fencing attempts in the log.

After node1's reboot, it is not able to rejoin cluster any more.


kernel: CMAN: Waiting to join or form a Linux-cluster
kernel: CMAN: sending membership request
kernel: CMAN: got node node2
cman: Timed-out waiting for cluster failed

While on node2:

kernel: CMAN: node node1 rejoining

and after ~4.5 minutes:

kernel: CMAN: too many transition restarts - will die
kernel: CMAN: we are leaving the cluster. Inconsistent cluster view
kernel: WARNING: dlm_emergency_shutdown
clurgmgrd[2848]: <warning> #67: Shutting down uncleanly
kernel: WARNING: dlm_emergency_shutdown
kernel: SM: 00000001 sm_stop: SG still joined
kernel: SM: 01000003 sm_stop: SG still joined
kernel: SM: 03000002 sm_stop: SG still joined
ccsd[2242]: Cluster is not quorate.  Refusing connection.
ccsd[2242]: Error while processing connect: Connection refused
ccsd[2242]: Invalid descriptor specified (-111).
ccsd[2242]: Someone may be attempting something evil.
ccsd[2242]: Error while processing get: Invalid request descriptor
ccsd[2242]: Invalid descriptor specified (-111).
ccsd[2242]: Someone may be attempting something evil.
ccsd[2242]: Error while processing get: Invalid request descriptor
ccsd[2242]: Invalid descriptor specified (-21).

and again ~1 minute later on node1:

kernel: CMAN: removing node node2 from the cluster : No response to messages
kernel: ------------[ cut here ]------------
kernel: kernel BUG at
kernel: invalid operand: 0000 [#1]
kernel: SMP
kernel: Modules linked in: cman(U) md5 ipv6 iptable_filter ip_tables
button battery ac uhci_hcd ehci_hcd hw_random tg3 floppy sg st mptspi
mptscsi mptbase dm_snapshot dm_zero dm_mirror ext3 jbd dm_mod cciss
sd_mod scsi_mod
kernel: CPU:    0
kernel: EIP:    0060:[<f8bebe2a>]    Not tainted VLI
kernel: EFLAGS: 00010246   (2.6.9-34.ELsmp)
kernel: EIP is at elect_master+0x2e/0x3a [cman]
kernel: eax: 00000000   ebx: f7b4afa0   ecx: 00000080   edx: 00000080
kernel: esi: f8bff044   edi: f7b4afd8   ebp: 00000000   esp: f7b4af98
kernel: ds: 007b   es: 007b   ss: 0068
kernel: Process cman_memb (pid: 2429, threadinfo=f7b4a000 task=c1a33230)
kernel: Stack: f8bfef08 f8be98d1 c1a7c580 f6e8ee00 f8be7eb7 c1a33230
c1a33230 f8be809a
kernel:        0000001f 00000000 f7b460b0 00000000 c1a33230 c011e71b
00100100 00200200
kernel:        00000000 00000000 0000007b f8be7ed8 00000000 00000000
c01041f5 00000000
kernel: Call Trace:
kernel:  [<f8be98d1>] a_node_just_died+0x13a/0x199 [cman]
kernel:  [<f8be7eb7>] process_dead_nodes+0x4e/0x6f [cman]
kernel:  [<f8be809a>] membership_kthread+0x1c2/0x39d [cman]
kernel:  [<c011e71b>] default_wake_function+0x0/0xc
kernel:  [<f8be7ed8>] membership_kthread+0x0/0x39d [cman]
kernel:  [<c01041f5>] kernel_thread_helper+0x5/0xb
kernel: Code: 28 fe bf f8 89 c3 ba 01 00 00 00 39 ca 7d 1c a1 2c fe bf
f8 8b 04 90 85 c0 74 0d 83 78 1c 02 75 07 89 03 8b 40 14 eb 0d 42 eb
e0 <0f> 0b 4e 0c 73 2d bf f8 31 c0 5b c3 a1 2c fe bf f8 e8 79 70 56
kernel:  <0>Fatal exception: panic in 5 seconds

During one other test, cluster did not crash, it just ended in the
state, when cman on rebooted node kept sending cluster membership
requests and those requests were ignored by other cluster node.
Output of tcpdump showed traffic was reaching active node, but there
was no reply nor any message in the logs of active node.  Only way to
get to normal state is to restart cman on active node (or reboot both

If I try to reboot one of cluster nodes shortly after rebooting both
nodes, it seems to leave and rejoin cluster successfully.

Has anyone observed similar behavior?  Is this known bug in U3, which
can be resolved by upgrade to latest version?  I've checked changelogs
and release notes (Btw, any chance to get back to "old" release notes
format for RHCS?  Release notes for U5 do not longer list fixed
bugzilla reports, only links some errata listings, which do not seem
to be accessible from Internet.), but haven't found any obvious
reference to this king of problem.

Ideas appreciated.


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