Hello, I was testing kexec/kdump on ls2085ardb using kexec-tools from: https://git.linaro.org/people/takahiro.akashi/kexec-tools.git/log/?h=arm64/kdump and kernel from: https://git.linaro.org/people/takahiro.akashi/linux-aarch64.git/log/?h=arm64/kdump ------------------------------------------------------------------------------------ Kernel required configs: CONFIG_KEXEC=y CONFIG_SYSFS=y CONFIG_DEBUG_INFO=y CONFIG_CRASH_DUMP=y CONFIG_PROC_VMCORE=y ------------------------------------------------------------------------------------ Starting kernel ... [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 4.11.0-rc3 (denyszagorui at kbp1-ldl-f65370) (gcc version 6.2.0 (GCC) ) #4 SMP PREEMPT Tue Apr 4 17:08:07 EEST 2017 [ 0.000000] Boot CPU: AArch64 Processor [411fd071] [ 0.000000] earlycon: uart8250 at MMIO 0x00000000021c0600 (options '') [ 0.000000] bootconsole [uart8250] enabled [ 0.000000] efi: Getting EFI parameters from FDT: [ 0.000000] efi: UEFI not found. [ 0.000000] crashkernel reserved: 0x00000000bfe00000 - 0x00000000ffe00000 (1024 MB) ..... [ 0.000000] Kernel command line: console=ttyS1,115200 root=/dev/mmcblk0p1 rootwait earlycon=uart8250,mmio,0x21c0600, ramdisk_size=0x2000000 default_hugepagesz=2m hugepagesz=2m hugepages=256 crashkernel=1024M ------------------------------------------------------------------------------------ I was trying two modes: direct boot (kexec -l than kexec -e) and kdump (kexec -p than echo c > /proc/sysrq-trigger). Direct boot: ------------------------------------------------------------------------------------ root at ls2085ardb:~# kexec -l /boot/Image --initrd=/boot/initrd.cpio --command-line="console=ttyS1,115200 root=/dev/ram0 earlycon=uart8250,mmio,0x21c0600, 1 maxcpus=1 reset_devices" -d arch_process_options:147: command_line: console=ttyS1,115200 root=/dev/ram0 earlycon=uart8250,mmio,0x21c0600, 1 maxcpus=1 reset_devices arch_process_options:149: initrd: /boot/initrd.cpio arch_process_options:150: dtb: (null) Try gzip decompression. Try LZMA decompression. lzma_decompress_file: read on /boot/Image of 65536 bytes failed kernel: 0xffffac0f8010 kernel_size: 0xe80a00 get_memory_ranges_iomem_cb: 0000000080000000 - 00000000ffffffff : System RAM get_memory_ranges_iomem_cb: 0000008080000000 - 00000083bfffffff : System RAM elf_arm64_probe: Not an ELF executable. image_arm64_load: kernel_segment: 0000000080000000 image_arm64_load: text_offset: 0000000000080000 image_arm64_load: image_size: 0000000000eea000 image_arm64_load: phys_offset: 0000000080000000 image_arm64_load: vp_offset: ffffffffffffffff image_arm64_load: PE format: yes ..... kexec_load: entry = 0x817ed660 flags = 0xb70000 nr_segments = 4 segment[0].buf = 0xffffac0f8010 segment[0].bufsz = 0xe80a00 segment[0].mem = 0x80080000 segment[0].memsz = 0xeea000 segment[1].buf = 0xffffab879010 segment[1].bufsz = 0x87e800 segment[1].mem = 0x80f6a000 segment[1].memsz = 0x87f000 segment[2].buf = 0x377b3e80 segment[2].bufsz = 0x3d64 segment[2].mem = 0x817e9000 segment[2].memsz = 0x4000 segment[3].buf = 0x377b7f20 segment[3].bufsz = 0x31c8 segment[3].mem = 0x817ed000 segment[3].memsz = 0x4000 kexec_load failed: Device or resource busy entry = 0x817ed660 flags = 0xb70000 nr_segments = 4 segment[0].buf = 0xffffac0f8010 segment[0].bufsz = 0xe80a00 segment[0].mem = 0x80080000 segment[0].memsz = 0xeea000 segment[1].buf = 0xffffab879010 segment[1].bufsz = 0x87e800 segment[1].mem = 0x80f6a000 segment[1].memsz = 0x87f000 segment[2].buf = 0x377b3e80 segment[2].bufsz = 0x3d64 segment[2].mem = 0x817e9000 segment[2].memsz = 0x4000 segment[3].buf = 0x377b7f20 segment[3].bufsz = 0x31c8 segment[3].mem = 0x817ed000 segment[3].memsz = 0x4000 root at ls2085ardb:~# kexec -e Nothing has been loaded! Not working for me: kexec_load failed: Device or resource busy kdump mode: ------------------------------------------------------------------------------------ root at ls2085ardb:~# kexec -p /boot/Image --initrd=/boot/initrd.cpio --command-line="console=ttyS1,115200 root=/dev/ram0 earlycon=uart8250,mmio,0x21c0600, 1 maxcpus=1 reset_devices" -d arch_process_options:147: command_line: console=ttyS1,115200 root=/dev/ram0 earlycon=uart8250,mmio,0x21c0600, 1 maxcpus=1 reset_devices arch_process_options:149: initrd: /boot/initrd.cpio arch_process_options:150: dtb: (null) Try gzip decompression. Try LZMA decompression. lzma_decompress_file: read on /boot/Image of 65536 bytes failed kernel: 0xffff86fa8010 kernel_size: 0xe80a00 get_memory_ranges_iomem_cb: 0000000080000000 - 00000000ffffffff : System RAM get_memory_ranges_iomem_cb: 0000008080000000 - 00000083bfffffff : System RAM elf_arm64_probe: Not an ELF executable. image_arm64_load: kernel_segment: 00000000bfe00000 image_arm64_load: text_offset: 0000000000080000 image_arm64_load: image_size: 0000000000eea000 image_arm64_load: phys_offset: 0000000080000000 image_arm64_load: vp_offset: ffffffffffffffff image_arm64_load: PE format: yes Reserved memory range 00000000bfe00000-00000000ffdfffff (0) Coredump memory ranges 0000000080000000-00000000bfdfffff (0) 00000000ffe00000-00000000ffffffff (0) 0000008080000000-00000083bfffffff (0) kernel symbol _text vaddr = ffff000008080000 load_crashdump_segments: page_offset: ffff800000000000 ... kexec_load: entry = 0xc15ed660 flags = 0xb70001 nr_segments = 5 segment[0].buf = 0xffff86fa8010 segment[0].bufsz = 0xe80a00 segment[0].mem = 0xbfe80000 segment[0].memsz = 0xeea000 segment[1].buf = 0xffff86729010 segment[1].bufsz = 0x87e800 segment[1].mem = 0xc0d6a000 segment[1].memsz = 0x87f000 segment[2].buf = 0x36959590 segment[2].bufsz = 0x3dc7 segment[2].mem = 0xc15e9000 segment[2].memsz = 0x4000 segment[3].buf = 0x3695d690 segment[3].bufsz = 0x31c8 segment[3].mem = 0xc15ed000 segment[3].memsz = 0x4000 segment[4].buf = 0x36949490 segment[4].bufsz = 0x400 segment[4].mem = 0xffdff000 segment[4].memsz = 0x1000 root at ls2085ardb:~# echo c > /proc/sysrroot at ls2085ardb:~# echo c > /proc/sysrq-trigger [ 265.274402] sysrq: SysRq : Trigger a crash [ 265.278588] Unable to handle kernel NULL pointer dereference at virtual address 00000000 ... [ 265.750726] Starting crashdump kernel... [ 265.754644] Some CPUs may be stale, kdump will be unreliable. [ 265.760388] ------------[ cut here ]------------ [ 265.765006] WARNING: CPU: 0 PID: 1360 at arch/arm64/kernel/machine_kexec.c:158 machine_kexec+0x44/0x280 ... root at ls2085ardb:~# ls -al /proc/ ... -r-------- 1 root root 15048032256 Mar 28 15:36 vmcore -r--r--r-- 1 root root 0 Mar 28 15:36 vmstat -r--r--r-- 1 root root 0 Mar 28 15:36 zoneinfo After that watched through /proc/vmcore using gdb. Seems to be working Best Regards, Denys -- Denys Zagorui GlobalLogic Kyiv, 03038, Protasov Business Park, N.Grinchenka, 2/1 M +380673173093 www.globallogic.com http://www.globallogic.com/email_disclaimer.txt
