On 19/08/2016:02:34:48 PM, James Morse wrote: > On 19/08/16 09:00, Pratyush Anand wrote: > > On 17/08/2016:04:33:31 PM, James Morse wrote: > >> copy_oldmem_page() and mmap_vmcore() provide two ways for userspace to read > >> from /proc/vmcore. Neither of these check with memblock to see if the page > >> they are accessing is nomap. On Seattle this causes: > > > > Thanks for the patch.It did resolve the kernel crash issue with makedumpfile, > > however neither there was any data in vmcore-dmesg nor crash utility was able to > > work the saved vmcore. > > vmcore-dmesg doesn't work for me, but crash did once I'd rebuilt it from the > most recent source. Yes, saved vmcore worked with latest crash. However, we will need to correct phys_offset and page_offset in kexec-tools to get meaningful output from vmcore-dmesg. ~Pratyush > > The most recent commit I have is: > b349598bb755 ("Fix for the ARM64 "bt -R <symbol>" option if the only reference") > > Are you using an older version? > > > Thanks, > > James > > > [0] http://lists.infradead.org/pipermail/linux-arm-kernel/2016-August/447597.html