Hi I just experienced a bizarre crash with OCFS2 which appears to be a kernel bug. I am using a primary primary setup with DRBD and OCFS2 on Ubuntu. There was a momentary network blip which caused DRBD to disconnect. It tried reconnecting but it split brained and the node which crashed went in to StandAlone mode. 56 seconds after DRBD had disconnected, syslog shows this: Apr 4 13:53:14 sau-efd65-or kernel: [3114321.109782] o2net: No longer connected to node weba (num 0) at 27.50.xx.xx:7777 Apr 4 13:53:14 sau-efd65-or kernel: [3114321.109818] o2cb: o2dlm has evicted node 0 from domain ECD4A41D57364B27A3C3244BBB83FA33 Apr 4 13:53:14 sau-efd65-or kernel: [3114321.109868] (o2hb-ECD4A41D57,4163,5):__dlm_put_mle:239 ERROR: bad mle: ffff8803c130a300 Apr 4 13:53:14 sau-efd65-or kernel: [3114321.125272] ------------[ cut here ]------------ Apr 4 13:53:15 sau-efd65-or kernel: [3114321.133095] kernel BUG at /build/buildd/linux-3.5.0/fs/ocfs2/dlm/dlmmaster.c:241! Apr 4 13:53:15 sau-efd65-or kernel: [3114321.148253] invalid opcode: 0000 [#1] SMP Apr 4 13:53:15 sau-efd65-or kernel: [3114321.156133] CPU 5 Apr 4 13:53:15 sau-efd65-or kernel: [3114321.156255] Modules linked in: ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2 ocfs2_nodemanager configfs ocfs2_stackglue quota_tree nfnetlink_log nfnetlink drbd lru_cache btrfs zlib_deflate libcrc$ Apr 4 13:53:15 sau-efd65-or kernel: [3114321.214562] Apr 4 13:53:15 sau-efd65-or kernel: [3114321.222865] Pid: 4163, comm: o2hb-ECD4A41D57 Not tainted 3.5.0-17-generic #28-Ubuntu Supermicro X9SCI/X9SCA/X9SCI/X9SCA Apr 4 13:53:15 sau-efd65-or kernel: [3114321.241534] RIP: 0010:[<ffffffffa0640409>] [<ffffffffa0640409>] __dlm_put_mle+0x89/0xe0 [ocfs2_dlm] Apr 4 13:53:15 sau-efd65-or kernel: [3114321.260875] RSP: 0018:ffff8803c3c0b9a0 EFLAGS: 00010297 Apr 4 13:53:15 sau-efd65-or kernel: [3114321.270500] RAX: 000000000000009a RBX: ffff8803c130a300 RCX: ffff88042fd56e18 Apr 4 13:53:15 sau-efd65-or kernel: [3114321.289984] RDX: ffffea000dbf8560 RSI: 0000000000000003 RDI: 0000000000000297 Apr 4 13:53:15 sau-efd65-or kernel: [3114321.310641] RBP: ffff8803c3c0b9c0 R08: 0000000000000297 R09: ffff88042fbf97a8 Apr 4 13:53:15 sau-efd65-or kernel: [3114321.332065] R10: 0000000000000024 R11: 0000000000000000 R12: ffff8803c998a400 Apr 4 13:53:15 sau-efd65-or kernel: [3114321.354254] R13: 0000000000000bae R14: 00000000000000ff R15: 0000000000000000 Apr 4 13:53:15 sau-efd65-or kernel: [3114321.376528] FS: 0000000000000000(0000) GS:ffff88042fd40000(0000) knlGS:0000000000000000 Apr 4 13:53:15 sau-efd65-or kernel: [3114321.398704] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b Apr 4 13:53:15 sau-efd65-or kernel: [3114321.409991] CR2: 000000000061bd84 CR3: 0000000001c0b000 CR4: 00000000001407e0 Apr 4 13:53:15 sau-efd65-or kernel: [3114321.433530] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Apr 4 13:53:15 sau-efd65-or kernel: [3114321.456424] DR3: 00Apr 4 22:01:03 localhost kernel: imklog 5.8.6, log source = /proc/kmsg started. That clearly isn't the normal expected behaviour. Should I submit full logs as a bug report? Thanks -- Nick Stallman Agentpoint Pty Ltd The Real Estate Web Developers Sydney, Australia nick at agentpoint.com www.agentpoint.com.au | www.zooproperty.com | www.ginga.com.au | www.business2.com.au Business2.com.au is a real estate agent information website that helps you understand Portals, Technology and comes with FREE tools to help your Agency become an online success!