[Crash-utility] "cannot access vmalloc'd module memory" when loading kdump'ed vmcore in crash

Hello kexec and crash mailing lists, Sorry to spam whoever's code this ISN'T an issue with, but I really am unsure of whether is a kdump or a crash issue. I am running an Ubuntu 7.04 with a 2.6.20 kernel (includes Ubuntus patches- source at http://packages.ubuntu.com/feisty/linux-source-2.6.20 ) and a modified VMSPLIT/PAGE_OFFSET value (see bottom for details) on an i386 machine with 4GB of memory. At first I thought this could be an issue with makedumpfile stripping out things it shouldn't, but I've found that setting up my initrd script so that it simply performs "cp /proc/vmcore /var/crash/vmcore" results in the same issue. I've tried this with both crash 4.0-6.3 and 4.0-7.2 and get the same result. Unfortunately I'm locked at kernel 2.6.20 for other reasons, or else I would try that. If anyone can offer suggestions of what to try, please let me know. If this is something that has already been resolved elsewhere, sorry to waste time, and if someone can point me to what resolved it, perhaps I can look at backporting the fix myself. Thanks for your time. crash-4.0-7.2$ ./crash ~/vmcore ~/targetfiles/vmlinux-2.6.20-17.39-custom2 crash 4.0-7.2 <snip>Copyright notices...</snip> GNU gdb 6.1 <snip>Copyright notices...</snip> This GDB was configured as "i686-pc-linux-gnu"... please wait... (gathering module symbol data) WARNING: cannot access vmalloc'd module memory KERNEL: /home/worthk/targetfiles/vmlinux-2.6.20-17.39-custom2 DUMPFILE: /home/worthk/vmcore CPUS: 2 DATE: Wed Oct 1 12:30:50 2008 UPTIME: 00:35:11 LOAD AVERAGE: 0.07, 0.09, 0.08 TASKS: 94 NODENAME: test-module RELEASE: 2.6.20-17.39-custom2 VERSION: #3 SMP Wed Sep 24 10:11:03 PDT 2008 MACHINE: i686 (2200 Mhz) MEMORY: 5 GB <6>SysRq : Trigger a crashdump" PID: 4304 COMMAND: "bash" TASK: 5d7e9030 [THREAD_INFO: f4b70000] CPU: 0 STATE: TASK_RUNNING (SYSRQ) crash> mod -s test mod: cannot access vmalloc'd module memory My kernel config is a bit outside the norm, in that the VMSPLIT value has been modified to give 3GB of memory the kernelspace and 1GB of memory to userspace. Below is a diff between the default Ubuntu "generic" config and mine: diff /boot/config-2.6.20-17-generic /boot/config-2.6.20-17.37-custom2 3,4c3,4 < # Linux kernel version: 2.6.20-17-generic < # Wed Aug 20 14:43:36 2008 --- 33c33 < CONFIG_VERSION_SIGNATURE="Ubuntu 2.6.20-17.39-generic" --- 51c51 < # CONFIG_EMBEDDED is not set --- 188,190c188,194 < CONFIG_HIGHMEM4G=y < # CONFIG_HIGHMEM64G is not set < CONFIG_PAGE_OFFSET=0xC0000000 --- 191a196 204c209 < # CONFIG_RESOURCES_64BIT is not set --- 1161a1167 1443a1450 1525a1533 Kevin Worth Network Security Software Engineer ProCurve networking by HP kevin.worth@hp.com<mailto:kevin.worth@hp.com> ph 916.785.4528 fx 916.785.1196