Testing kexec/kdump on ls2085ardb (arm64)
Bhupesh Sharma
bhsharma at redhat.com
Mon Apr 10 02:19:04 PDT 2017
Hi,
On Fri, Apr 7, 2017 at 5:22 PM, Denys Zagorui
<denys.zagorui at globallogic.com> wrote:
> 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)
Having worked on LS0285A-RDB before and seeing your boot logs, seems
you are using the u-boot bootloader to boot the Linux. If this is the
case, please make sure that you are using the proper PPA (EL3 firmware
responsible for managing PSCI specifications) on the board (if in
doubt contact the NXP support team).
> .....
>
> [ 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
Try removing the hugepage allocation from the command line for initial
tests - in case you are not using the networking applications (like
packet forwarding) to see if that improves the results.
> ------------------------------------------------------------------------------------
>
> 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
Can you please share the complete logs (may be post them on pastebin)
from when the primary boots up, so that we can help you better with
the same.
Also I remember LS2085A-RDB had issues with kexec earlier as well
(http://www.spinics.net/lists/arm-kernel/msg504353.html). Please check
with NXP support if this has been resolved/root-caused at their end.
Regards,
Bhupesh
>
> 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 rese t_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
>
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