James, On Fri, Jul 22, 2016 at 02:55:02PM +0100, James Morse wrote: > Hi, > > On 21/07/16 01:57, AKASHI Takahiro wrote: > > Could you please apply the diff attached below and confirm that > > kdump works in your environment? > > I can't test it by myself since my hikey board seems to be broken now. > > With this I get a failure even earlier, even with 'acpi=off'. > With this patch, on boot of the kdump kernel I get: I think you ran into the problem that I mentioned in: http://lists.infradead.org/pipermail/linux-arm-kernel/2016-July/444500.html You may want to - apply the change stated above, or (Given that we don't know about the configuration of crash dump kernel, checking for CONFIG_ZONE_DMA doesn't make sense. Instead, we'd better always enforce ARCH_LOW_ADDRESS_LIMIT.) - explicitly specify the start address (Y) below ARCH_LOW_ADDRESS_LIMIT at "crashkernel=X at Y" Either would work. Thanks, -Takahiro AKASHI > [ 0.000000] Linux version 4.7.0-rc4+ (morse at melchizedek) (gcc version 5.2.1 6 > [ 0.000000] Boot CPU: AArch64 Processor [411fd071] > [ 0.000000] earlycon: pl11 at MMIO 0x000000007ff80000 (options '') > [ 0.000000] bootconsole [pl11] enabled > [ 0.000000] debug: ignoring loglevel setting. > [ 0.000000] efi: Getting EFI parameters from FDT: > [ 0.000000] efi: EFI v2.50 by ARM Juno EFI Nov 24 2015 12:36:35 > [ 0.000000] efi: ACPI=0xf95b0000 ACPI 2.0=0xf95b0014 PROP=0xfe8db4d8 > [ 0.000000] Reserving 1KB of memory at 0x9fffff000 for elfcorehdr > [ 0.000000] cma: Failed to reserve 16 MiB > [ 0.000000] On node 0 totalpages: 132160 > [ 0.000000] DMA zone: 17 pages used for memmap > [ 0.000000] DMA zone: 0 pages reserved > [ 0.000000] DMA zone: 1088 pages, LIFO batch:0 > [ 0.000000] Normal zone: 2048 pages used for memmap > [ 0.000000] Normal zone: 131072 pages, LIFO batch:31 > [ 0.000000] bootmem alloc of 64 bytes failed! > [ 0.000000] Kernel panic - not syncing: Out of memory > [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.7.0-rc4+ #4600 > [ 0.000000] Hardware name: ARM Juno development board (r1) (DT) > [ 0.000000] Call trace: > [ 0.000000] [<ffff0000080889a8>] dump_backtrace+0x0/0x1e8 > [ 0.000000] [<ffff000008088ba4>] show_stack+0x14/0x20 > [ 0.000000] [<ffff000008363274>] dump_stack+0x94/0xb8 > [ 0.000000] [<ffff00000816192c>] panic+0x10c/0x278 > [ 0.000000] [<ffff000008b14980>] free_bootmem_late+0x0/0xa0 > [ 0.000000] [<ffff000008b14e68>] __alloc_bootmem_low+0x2c/0x38 > [ 0.000000] [<ffff000008b02954>] setup_arch+0x2e4/0x5ac > [ 0.000000] [<ffff000008b00854>] start_kernel+0x70/0x390 > [ 0.000000] [<ffff000008b001bc>] __primary_switched+0x30/0x6c > [ 0.000000] ---[ end Kernel panic - not syncing: Out of memory > > > Trying again, booted with: > > console=ttyAMA0,115200 earlycon=pl011,0x7ff80000 root=/dev/nfs > > nfsroot=10.X.X.X:/ubuntu-15.04-server-arm64,v3 resume=/dev/sda2 no_console_suspend > > ip=dhcp rw crashkernel=512M stacktrace ignore_loglevel=1 acpi=off efi=debug > memblock=debug > > kexec-tools invoked as: > > kexec -x --reuse-cmdline --dtb=/sys/firmware/fdt -p /aarch64-Image > > cat /proc/iomem | grep Crash: > > 9e0000000-9ffffffff : Crash kernel > > crash kernel memblock before call to memblock_cap_memory_range(): > [ 0.000000] MEMBLOCK configuration: > [ 0.000000] memory size = 0x1fef10000 reserved size = 0x4f3b > [ 0.000000] memory.cnt = 0x9 > [ 0.000000] memory[0x0] [0x00000080000000-0x000000dfffffff], 0x60000000 > bytes flags: 0x0 > [ 0.000000] memory[0x1] [0x000000e00f0000-0x000000f949ffff], 0x193b0000 > bytes flags: 0x0 > (uefi runtime code|data|acpi:) > [ 0.000000] memory[0x2] [0x000000f94a0000-0x000000f984ffff], 0x3b0000 > bytes flags: 0x4 > [ 0.000000] memory[0x3] [0x000000f9850000-0x000000fe81ffff], 0x4fd0000 > bytes flags: 0x0 > (uefi runtime data:) > [ 0.000000] memory[0x4] [0x000000fe820000-0x000000fe85ffff], 0x40000 > bytes flags: 0x4 > [ 0.000000] memory[0x5] [0x000000fe860000-0x000000fe86ffff], 0x10000 > bytes flags: 0x0 > (uefi runtime data:) > [ 0.000000] memory[0x6] [0x000000fe870000-0x000000fe8bffff], 0x50000 > bytes flags: 0x4 > [ 0.000000] memory[0x7] [0x000000fe8c0000-0x000000feffffff], 0x740000 > bytes flags: 0x0 > [ 0.000000] memory[0x8] [0x00000880000000-0x000009ffffffff], 0x180000000 > bytes flags: 0x0 > [ 0.000000] reserved.cnt = 0x2 > (uefi memory map:) > [ 0.000000] reserved[0x0] [0x000000f985a000-0x000000f985afff], 0x1000 > bytes flags: 0x0 > (device tree:) > [ 0.000000] reserved[0x1] [0x000009e0ce0000-0x000009e0ce3f3a], 0x3f3b > bytes flags: 0x0 > > crash kernel memblock after call to memblock_cap_memory_range(): > [ 0.000000] MEMBLOCK configuration: > [ 0.000000] memory size = 0x20440000 reserved size = 0x3f3b > [ 0.000000] memory.cnt = 0x4 > [ 0.000000] memory[0x0] [0x000000f94a0000-0x000000f984ffff], 0x3b0000 > bytes flags: 0x4 > [ 0.000000] memory[0x1] [0x000000fe820000-0x000000fe85ffff], 0x40000 > bytes flags: 0x4 > [ 0.000000] memory[0x2] [0x000000fe870000-0x000000fe8bffff], 0x50000 > bytes flags: 0x4 > [ 0.000000] memory[0x3] [0x000009e0000000-0x000009ffffffff], 0x20000000 > bytes flags: 0x0 > [ 0.000000] reserved.cnt = 0x1 > [ 0.000000] reserved[0x0] [0x000009e0ce0000-0x000009e0ce3f3a], 0x3f3b > bytes flags: 0x0 > (reserve kernel text:) > [ 0.000000] memblock_reserve: [0x000009e0080000-0x000009e0cd0fff] flags 0x0 > arm64_memblock_init+0x1e0/0x40c > (reserve elfcorehdr:) > [ 0.000000] memblock_reserve: [0x000009fffff000-0x000009fffff3ff] flags 0x0 > arm64_memblock_init+0x37c/0x40c > [ 0.000000] Reserving 1KB of memory at 0x9fffff000 for elfcorehdr > [ 0.000000] cma: Failed to reserve 16 MiB > ... > > It looks like memblock_cap_memory_range() did exactly what you intended > > This first fault seems to be because memblock_start_of_DRAM() is being dragged > down by the preserved nomap areas, this means there isn't any usable memory > within ~4G of memblock_start_of_DRAM()... > > I will dig into the bootmem alloc failure next week... > > (let me know if you want the full boot logs... they are more noise than signal) > > > Thanks, > > James > > > >
