Hi all this my configuration 2 servers on debian 2.6.26-2-amd64 #1 SMP Thu Nov 5 02:23:12 UTC 2009 x86_64 GNU/Linux each server run nfsd a pool a server can be access on drdb/ocfs disk via nfs We're using OCFS2 Node Manager and DLM 1.5.0. drbd: initialised. Version: 8.0.14 (api:86/proto:86) drbd: GIT-hash: bb447522fc9a87d0069b7e14f0234911ebdab0f7 build by phil at fat-tyre, 2008-11-12 16:40:33 sometime i have crash like this [26969.636164] CPU 1 [26969.636189] Modules linked in: ocfs2 drbd cn ocfs2_dlmfs ocfs2_stack_o2cb ocfs2_dlm ocfs2_nodeman ager ocfs2_stackglue configfs nfsd auth_rpcgss exportfs nfs lockd nfs_acl sunrpc ipv6 loop parport_p c parport snd_pcm snd_timer snd soundcore serio_raw i2c_i801 rng_core snd_page_alloc pcspkr i2c_core psmouse iTCO_wdt container button shpchp i5000_edac edac_core pci_hotplug evdev ext3 jbd mbcache id e_cd_mod cdrom ata_generic libata dock sd_mod piix floppy ide_pci_generic ide_core ehci_hcd 3w_9xxx scsi_mod uhci_hcd e1000e thermal processor fan thermal_sys [26969.636526] Pid: 2579, comm: nfsd Not tainted 2.6.26-2-amd64 #1 [26969.636558] RIP: 0010:[<ffffffffa03df427>] [<ffffffffa03df427>] :ocfs2:ocfs2_inode_l ock_full+0x875/0xd08 [26969.636631] RSP: 0018:ffff8104174c1cf0 EFLAGS: 00010286 [26969.636662] RAX: 0000000000000091 RBX: ffff810355220000 RCX: 000000000000d8c7 [26969.636697] RDX: 000000000000d8c7 RSI: 0000000000000046 RDI: 0000000000000286 [26969.636732] RBP: ffff8103c5c394e8 R08: ffff8103c5c39100 R09: ffff8104174c1800 [26969.636766] R10: 0000000000000000 R11: 000001ff804fe0f0 R12: 0000000100080000 [26969.636801] R13: ffff8103c5c39100 R14: 0000000000000000 R15: ffff8103c5c39218 [26969.636836] FS: 00007f230680d6e0(0000) GS:ffff81042e48a8c0(0000) knlGS:0000000000000000 [26969.636889] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [26969.636921] CR2: 00007f93fd951000 CR3: 000000042b96f000 CR4: 00000000000006e0 [26969.636955] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [26969.636990] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [26969.637025] Process nfsd (pid: 2579, threadinfo ffff8104174c0000, task ffff81042e6e2100) [26969.637078] Stack: ffff81032bfe9812 ffff81042bfe9736 00000000b5168528 0000000000000000 [26969.637138] 0000000100000000 ffff8103d1073080 ffff8103c5cee8e8 ffff8103c5c394e8 [26969.637196] ffff8103c5c394e8 ffff8104174c1db0 ffff81042cd0a800 ffff81042b3a8000 [26969.637235] Call Trace: [26969.637295] [<ffffffffa03eda7e>] ? :ocfs2:ocfs2_inode_revalidate+0x13a/0x214 [26969.637343] [<ffffffffa03e98e9>] ? :ocfs2:ocfs2_getattr+0x78/0x167 [26969.637390] [<ffffffffa02df513>] ? :nfsd:encode_post_op_attr+0x3e/0x84 [26969.637435] [<ffffffffa02d8141>] ? :nfsd:nfsd_lookup+0xa1/0xae [26969.637480] [<ffffffffa02e091b>] ? :nfsd:nfs3svc_encode_diropres+0x32/0x62 [26969.637524] [<ffffffffa02d32d2>] ? :nfsd:nfsd_dispatch+0x168/0x1b6 [26969.637577] [<ffffffffa024859b>] ? :sunrpc:svc_process+0x408/0x6e9 [26969.637615] [<ffffffff804295a4>] ? __down_read+0x12/0xa1 [26969.637655] [<ffffffffa02d3671>] ? :nfsd:nfsd+0x0/0x2a3 [26969.637695] [<ffffffffa02d3805>] ? :nfsd:nfsd+0x194/0x2a3 [26969.637729] [<ffffffff802301ec>] ? schedule_tail+0x27/0x5c [26969.637763] [<ffffffff8020cf28>] ? child_rip+0xa/0x12 [26969.637802] [<ffffffffa02d3671>] ? :nfsd:nfsd+0x0/0x2a3 [26969.637841] [<ffffffffa02d3671>] ? :nfsd:nfsd+0x0/0x2a3 [26969.637882] [<ffffffffa02d3671>] ? :nfsd:nfsd+0x0/0x2a3 [26969.637913] [<ffffffff8020cf1e>] ? child_rip+0x0/0x12 [26969.637944] [26969.637966] [26969.638274] RSP <ffff8104174c1cf0> [26969.638655] ---[ end trace de22b7902a3499d8 ] i Hope you can help me to find a way to resolv this problem s?bastien.