I've got a pair of HA servers I'm trying to get into production. Here are some specs : Xeon X3210 Quad Core (aka Core 2 Quad) 2.13Ghz (four logical processors, no Hyper Threading) 4GB memory Hardware (3ware) Raid 1 mirror, 2 x Seagate 750GB SATA2 650GB DRBD partition run on top of an LVM2 partition. CentOS 5.2 2.6.18-92.1.6.el5.centos.plus DRBD 8.2 (drbd82-8.2.6-1.el5.centos) Kernel Module kmod-drbd82-8.2.6-1.2.6.18_92.1.6.el5.centos.plus I've been trying to rsync data from a remote server and it's crashed a couple of times now. It does not happen immediately, but over time. I connected a serial console and got the below panic message. The last file copied was ~1GB in size, but previous files up to 4GB had been copied. I do not have kernel core dumping enabled, but that's a possibility if needed. Not sure if this is a bug or is caused by something I've done. This isn't my first DRBD install (although first on top of LVM) and I believe I've gotten everything setup correctly. I did have a full sync rate (110M) enabled over Gbe, if that's relevant. Thoughts? Regards, Chris [root at haws2 ~]# pvscan PV /dev/sda2 VG VolGroup00 lvm2 [698.28 GB / 0 free] Total: 1 [698.28 GB] / in use: 1 [698.28 GB] / in no VG: 0 [0 ] [root at haws2 ~]# lvscan ACTIVE '/dev/VolGroup00/LogVol00' [39.06 GB] inherit ACTIVE '/dev/VolGroup00/LogVol02' [658.72 GB] inherit ACTIVE '/dev/VolGroup00/LogVol01' [512.00 MB] inherit [root at haws2 ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/VolGroup00-LogVol00 39676508 1938880 35689628 6% / /dev/sda1 194442 23650 160753 13% /boot tmpfs 1684156 0 1684156 0% /dev/shm /dev/drbd0 679824572 113321224 531970212 18% /home [root at haws1 ~]# BUG: unable to handle kernel paging request at virtual address c printing eip: c04e9291 *pde = 00000000 Oops: 0000 [#1] SMP last sysfs file: /devices/pci0000:00/0000:00:00.0/irq Modules linked in: softdog drbd(U) autofs4 hidp rfcomm l2cap bluetooth sunrpc id CPU: 0 EIP: 0060:[<c04e9291>] Tainted: G VLI EFLAGS: 00010046 (2.6.18-92.1.6.el5.centos.plus #1) EIP is at list_del+0x25/0x5c eax: fe187128 ebx: f04a6ab8 ecx: f04a6a8c edx: f04a6a8c esi: fe187128 edi: f4e355a0 ebp: f426c800 esp: f385df3c ds: 007b es: 007b ss: 0068 Process drbd0_asender (pid: 2900, ti=f385d000 task=f4932000 task.ti=f385d000) Stack: 000000e6 f8d1953b 00000000 f04a6a8c 000000e6 00000001 ee187b14 00000046 f49e7bc0 f04a6ab8 f04a6a8c f426c800 fe187128 f4e355a0 0000349f f8d24805 00000800 f426c800 f426c800 00000008 f426c9f4 f8d14d47 f385dfbc f8d15fbc Call Trace: [<f8d1953b>] _req_may_be_done+0x4ea/0x710 [drbd] [<f8d24805>] tl_release+0x35/0x172 [drbd] [<f8d14d47>] got_BarrierAck+0x10/0x6b [drbd] [<f8d15fbc>] drbd_asender+0x3b1/0x4e7 [drbd] [<f8d24a53>] drbd_thread_setup+0x0/0x14e [drbd] [<f8d24adb>] drbd_thread_setup+0x88/0x14e [drbd] [<f8d24a53>] drbd_thread_setup+0x0/0x14e [drbd] [<c0405c3b>] kernel_thread_helper+0x7/0x10 ======================= Code: 89 c3 eb eb 90 90 53 89 c3 8b 40 04 8b 00 39 d8 74 17 50 53 68 9b 9a 63 c EIP: [<c04e9291>] list_del+0x25/0x5c SS:ESP 0068:f385df3c <0>Kernel panic - not syncing: Fatal exception BUG: warning at arch/i386/kernel/smp.c:550/smp_call_function() (Tainted: G ) [<c0417ae0>] stop_this_cpu+0x0/0x33 [<c04178cf>] smp_call_function+0x57/0xc3 [<c0426682>] printk+0x18/0x8e [<c041794e>] smp_send_stop+0x13/0x1c [<c0425c53>] panic+0x4c/0x16d [<c04064dd>] die+0x25d/0x291 [<c060c48b>] do_page_fault+0x3ea/0x4b8 [<c060c0a1>] do_page_fault+0x0/0x4b8 [<c0405a71>] error_code+0x39/0x40 [<c04e9291>] list_del+0x25/0x5c [<f8d1953b>] _req_may_be_done+0x4ea/0x710 [drbd] [<f8d24805>] tl_release+0x35/0x172 [drbd] [<f8d14d47>] got_BarrierAck+0x10/0x6b [drbd] [<f8d15fbc>] drbd_asender+0x3b1/0x4e7 [drbd] [<f8d24a53>] drbd_thread_setup+0x0/0x14e [drbd] [<f8d24adb>] drbd_thread_setup+0x88/0x14e [drbd] [<f8d24a53>] drbd_thread_setup+0x0/0x14e [drbd] [<c0405c3b>] kernel_thread_helper+0x7/0x10 =======================