Documentation for kdump - the kexec-based crash dumping solution ================================================================ DESIGN ====== Kdump uses kexec to reboot to a second kernel whenever a dump needs to be taken. This second kernel is booted with very little memory. The first kernel reserves the section of memory that the second kernel uses. This ensures that on-going DMA from the first kernel does not corrupt the second kernel. All the necessary information about Core image is encoded in ELF format and stored in reserved area of memory before crash. Physical address of start of ELF header is passed to new kernel through command line parameter elfcorehdr=. On i386, the first 640 KB of physical memory is needed to boot, irrespective of where the kernel loads. Hence, this region is backed up by kexec just before rebooting into the new kernel. In the second kernel, "old memory" can be accessed in two ways. - The first one is through a /dev/oldmem device interface. A capture utility can read the device file and write out the memory in raw format. This is raw dump of memory and analysis/capture tool should be intelligent enough to determine where to look for the right information. ELF headers (elfcorehdr=) can become handy here. - The second interface is through /proc/vmcore. This exports the dump as an ELF format file which can be written out using any file copy command (cp, scp, etc). Further, gdb can be used to perform limited debugging on the dump file. This method ensures methods ensure that there is correct ordering of the dump pages (corresponding to the first 640 KB that has been relocated). SETUP ===== 1) Download http://www.xmission.com/~ebiederm/files/kexec/kexec-tools-1.101.tar.gz and apply http://lse.sourceforge.net/kdump/patches/kexec-tools-1.101-kdump.patch and after that build the source. 2) Download and build the appropriate (2.6.13-rc1 onwards) vanilla kernel. Two kernels need to be built in order to get this feature working. A) First kernel: a) Enable "kexec system call" feature (in Processor type and features). CONFIG_KEXEC=y b) This kernel's physical load address should be the default value of 0x100000 (0x100000, 1 MB) (in Processor type and features). CONFIG_PHYSICAL_START=0x100000 c) Enable "sysfs file system support" (in Pseudo filesystems). CONFIG_SYSFS=y d) Boot into first kernel with the command line parameter "crashkernel=Y@X". Use appropriate values for X and Y. Y denotes how much memory to reserve for the second kernel, and X denotes at what physical address the reserved memory section starts. For example: "crashkernel=64M@16M". B) Second kernel: a) Enable "kernel crash dumps" feature (in Processor type and features). CONFIG_CRASH_DUMP=y b) Specify a suitable value for "Physical address where the kernel is loaded" (in Processor type and features). Typically this value should be same as X (See option d) above, e.g., 16 MB or 0x1000000. CONFIG_PHYSICAL_START=0x1000000 c) Enable "/proc/vmcore support" (Optional, in Pseudo filesystems). CONFIG_PROC_VMCORE=y d) Disable SMP support and build a UP kernel (Until it is fixed). CONFIG_SMP=n e) Enable "Local APIC support on uniprocessors". CONFIG_X86_UP_APIC=y f) Enable "IO-APIC support on uniprocessors" CONFIG_X86_UP_IOAPIC=y Note: i) Options a) and b) depend upon "Configure standard kernel features (for small systems)" (under General setup). ii) Option a) also depends on CONFIG_HIGHMEM (under Processor type and features). iii) Both option a) and b) are under "Processor type and features". 3) Boot into the first kernel. You are now ready to try out kexec-based crash dumps. 4) Load the second kernel to be booted using: kexec -p --args-linux --elf32-core-headers --append="root= init 1 irqpoll" Note: i) has to be a vmlinux image. bzImage will not work, as of now. ii) By default ELF headers are stored in ELF64 format. Option --elf32-core-headers forces generation of ELF32 headers. gdb can not open ELF64 headers on 32 bit systems. So creating ELF32 headers can come handy for users who have got non-PAE systems and hence have memory less than 4GB. iii) Specify "irqpoll" as command line parameter. This reduces driver initialization failures in second kernel due to shared interrupts. 5) System reboots into the second kernel when a panic occurs. A module can be written to force the panic or "ALT-SysRq-c" can be used initiate a crash dump for testing purposes. 6) Write out the dump file using cp /proc/vmcore Dump memory can also be accessed as a /dev/oldmem device for a linear/raw view. To create the device, type: mknod /dev/oldmem c 1 12 Use "dd" with suitable options for count, bs and skip to access specific portions of the dump. Entire memory: dd if=/dev/oldmem of=oldmem.001 ANALYSIS ======== Limited analysis can be done using gdb on the dump file copied out of /proc/vmcore. Use vmlinux built with -g and run gdb vmlinux Stack trace for the task on processor 0, register display, memory display work fine. Note: gdb cannot analyse core files generated in ELF64 format for i386. TODO ==== 1) Provide a kernel pages filtering mechanism so that core file size is not insane on systems having huge memory banks. 2) Modify "crash" tool to make it recognize this dump. CONTACT ======= Vivek Goyal (vgoyal@in.ibm.com) Maneesh Soni (maneesh@in.ibm.com)