Package: linux-image-2.6.26-2-xen-686 Version: 2.6.26-17lenny2 Severity: normal
For our xen VMs the kernel gives the attach oops when I try to add a new block device to a domU and this attempt fails because of not available loop devices. The command (with output) used to add the device was: ==================== sudo xm block-attach callweaver file:/vm/pv-kernel/modules.img hdb2 r Error: Device 834 (vbd) could not be connected. Failed to find an unused loop device Usage: xm block-attach <Domain> <BackDev> <FrontDev> <Mode> [BackDomain] Create a new virtual block device. ==================== While the missing loop device is a problem of the dom0 system the kernel oops occurs in the domU. The kernel oops didn't crash the machine, so I set severity to normal. The dom0 is running Lenny with an x86_64 kernel 2.6.26-2+schedpatch.1-xen-amd64, the standard debian xen kernel with an applied patch against some scheduler bugs. I don't think the bug is caused by this patch, but if required I could try to reproduce it with the standard kernel on the dom0 machine. # uname -a Linux callweaver 2.6.26-2-xen-686 #1 SMP Fri Aug 14 04:00:01 UTC 2009 i686 GNU/L inux =================== [661323.371745] BUG: unable to handle kernel NULL pointer dereference at 00000000 [661323.371759] IP: [<c024a3e4>] backend_changed+0x17d/0x1e2 [661323.371772] *pdpt = 0000000081473027 *pde = 0000000000000000 [661323.371781] Oops: 0000 [#1] SMP [661323.371787] Modules linked in: ext3 jbd mbcache dm_mirror dm_log dm_snapshot dm_mod raid10 raid1 md_mod thermal_sys [661323.371807] [661323.371811] Pid: 19, comm: xenwatch Not tainted (2.6.26-2-xen-686 #1) [661323.371817] EIP: 0061:[<c024a3e4>] EFLAGS: 00010246 CPU: 0 [661323.371824] EIP is at backend_changed+0x17d/0x1e2 [661323.371830] EAX: c6b52800 EBX: c6b52800 ECX: c024a267 EDX: 00000000 [661323.371836] ESI: c1120000 EDI: c6b52800 EBP: 00000000 ESP: c7c95f80 [661323.371843] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0069 [661323.371850] Process xenwatch (pid: 19, ti=c7c94000 task=c7c8a900 task.ti=c7c 94000) [661323.371856] Stack: c02408f8 00000000 c229bc80 c0336772 c6b52800 c3c50f80 c03 6f7e4 00000000 [661323.371873] c0242a3a c3c50e80 c6b52810 c3c50e80 c0241478 00000000 c02 41b18 c0241c4d [661323.371889] 00000000 c7c8a900 c012ec88 c7c95fcc c7c95fcc 00000000 c01 2ebc5 c012eb8d [661323.371905] Call Trace: [661323.371911] [<c02408f8>] xenbus_read_driver_state+0x1c/0x2f [661323.371922] [<c0242a3a>] otherend_changed+0x63/0x67 [661323.371930] [<c0241478>] xenwatch_handle_callback+0x12/0x41 [661323.371939] [<c0241b18>] xenwatch_thread+0x0/0x14b [661323.371946] [<c0241c4d>] xenwatch_thread+0x135/0x14b [661323.371954] [<c012ec88>] autoremove_wake_function+0x0/0x2d [661323.371963] [<c012ebc5>] kthread+0x38/0x5f [661323.371970] [<c012eb8d>] kthread+0x0/0x5f [661323.371976] [<c010425f>] kernel_thread_helper+0x7/0x10 [661323.371985] ======================= [661323.371989] Code: 03 05 c4 b1 35 c0 c6 40 01 00 80 38 00 74 05 e8 e6 25 ff f f 8b 46 04 e8 68 ca f8 ff c7 86 dc 13 00 00 01 00 00 00 eb 60 8b 56 04 <8b> 02 c 1 e0 14 0b 42 04 e8 78 80 f4 ff 85 c0 89 c3 75 10 68 b7 [661323.372065] EIP: [<c024a3e4>] backend_changed+0x17d/0x1e2 SS:ESP 0069:c7c95f 80 [661323.372080] ---[ end trace 981edaec6b11ee62 ]--- =================== -- System Information: Debian Release: lenny/sid APT prefers stable APT policy: (500, 'stable') Architecture: i386 (i686) Kernel: Linux 2.6.26-2-xen-686 (SMP w/1 CPU core) Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968) Shell: /bin/sh linked to /bin/bash Versions of packages linux-image-2.6.26-2-xen-686 depends on: ii initramfs-tools 0.92o tools for generating an initramfs ii linux-modules-2.6.26-2-x 2.6.26-17lenny2 Linux 2.6.26 modules on i686 Versions of packages linux-image-2.6.26-2-xen-686 recommends: ii libc6-xen 2.7-10 GNU C Library: Shared libraries [X Versions of packages linux-image-2.6.26-2-xen-686 suggests: pn grub <none> (no description available) pn linux-doc-2.6.26 <none> (no description available) -- no debconf information -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
