On Wed, Nov 16, 2011 at 6:57 AM, Tim Hartrick <tim at edgecast.com> wrote: > > Americo, > > I downloaded the source for kexec-tools 1:2.0.2-1ubuntu3 and rebuilt it > with -DDEBUG and installed. ?Below are the results using the > 2.6.38-8-server Ubuntu kernel as base and crashkernel. ?Note that the > crashkernel size has been increased to 479M. Thanks for testing! > > While I have the list's attention, I would like to mention another > problem in this area. ?The 2.6.38-8-server kernel cannot create a > crashkernel area greater than 479M in size (e.g. crashkernel=480M). ?If > the crashkernel is relocated (e.g. crashkernel=480M at 8G), then the kernel > will create the area but kexec (1:2.0.1-1ubuntu3) fails while attempting > to load crashkernel into the reserved area. I am afraid kexec can't load the kernel to memory above 4G. > > This is a fatal problem since the 2.6.38-8-server kernel running as > crashkernel requires more than 479M of crashkernel area to successfully > take a dump on our systems. ?I will be happy to provide additional > information about this one as well. Well, this is not kernel problem, it is a problem of your kdump tool on Ubuntu, the initrd of the second kernel should do as minimum things as possible. > Elf header: p_type = 4, p_offset = 0xdb74000000000000 p_paddr = 0xdb74000000000000 p_vaddr = 0x0 p_filesz = 0x400 p_memsz = 0x400 > Elf header: p_type = 4, p_offset = 0xdb74000000000000 p_paddr = 0xdb74000000000000 p_vaddr = 0x0 p_filesz = 0x400 p_memsz = 0x400 > Elf header: p_type = 4, p_offset = 0xdb74000000000000 p_paddr = 0xdb74000000000000 p_vaddr = 0x0 p_filesz = 0x400 p_memsz = 0x400 > Elf header: p_type = 4, p_offset = 0xdb74000000000000 p_paddr = 0xdb74000000000000 p_vaddr = 0x0 p_filesz = 0x400 p_memsz = 0x400 > Elf header: p_type = 4, p_offset = 0xdb74000000000000 p_paddr = 0xdb74000000000000 p_vaddr = 0x0 p_filesz = 0x400 p_memsz = 0x400 > Elf header: p_type = 4, p_offset = 0xdb74000000000000 p_paddr = 0xdb74000000000000 p_vaddr = 0x0 p_filesz = 0x400 p_memsz = 0x400 > Elf header: p_type = 4, p_offset = 0xdb74000000000000 p_paddr = 0xdb74000000000000 p_vaddr = 0x0 p_filesz = 0x400 p_memsz = 0x400 > Elf header: p_type = 4, p_offset = 0xdb74000000000000 p_paddr = 0xdb74000000000000 p_vaddr = 0x0 p_filesz = 0x400 p_memsz = 0x400 You have 8 cpus, but it is strange that these PT_NOTE program headers are all same... So, can you show us the output of the following commands on your machine? #hexdump -C /sys/kernel/crash_notes #for i in /sys/devices/system/cpu/cpu*/crash_notes; do hexdump -C $i; done Thanks.
