On Tue, Jun 11, 2013 at 3:54 PM, Cliff Wickman <cpw at sgi.com> wrote: > > I'm getting a hang when trying to enter a high-memory crash kernel, > and I'm at a loss as to how to debug this. > > This is a 3.10.0-rc3 kernel, and set up as the crash kernel by kexec 2.0.4. > The machine is an SGI UV1000. what is your mem size? Just tried on one 3T system, it works well... in first kernel: sca05-0a81fd78:~ # cat /proc/iomem 00000000-00000fff : reserved 00001000-0009afff : System RAM 0009b000-0009ffff : reserved 000a0000-000bffff : PCI Bus 0000:00 000c0000-000c7fff : Video ROM 000c8000-000ce7ff : Adapter ROM 000ce800-000cf7ff : Adapter ROM 000cf800-000d07ff : Adapter ROM 000e0000-000fffff : reserved 000f0000-000fffff : System ROM 00100000-68ad0fff : System RAM 01000000-020b7d40 : Kernel code 020b7d41-02bd47ff : Kernel data 02f80000-03c20fff : Kernel bss 68ad1000-69265fff : reserved 69266000-69355fff : ACPI Tables 69356000-6a0e4fff : ACPI Non-volatile Storage 6a0e5000-6bd68fff : reserved 6bd69000-6bd98fff : System RAM 6bd99000-6bd99fff : reserved 6bd9a000-7bffffff : System RAM 74000000-7bffffff : Crash kernel ... 100000000-3007fffffff : System RAM 30040000000-3007fffffff : Crash kernel boot command line: console=uart8250,io,0x3f8,115200n8 initrd=kernel.org/x.xz rw root=/dev/ram0 debug ignore_loglevel unknown_nmi_panic crashkernel=1024M,high crashkernel=128M,low pci=routeirq ip=dhcp load_ramdisk=1 BOOT_IMAGE=kernel.org/bzImage_3.10_k8.2 kexec second kernel: # ./kexec -p $VMLINUZ --command-line="initcall_debug nr_cpus=1 pci=routeirq ignore _loglevel unknown_nmi_panic apic=debug ramdisk_size=$RDSZ root=/dev/ram0 rw ip=d hcp $CONSOLE" --ramdisk=$INITRD add_buffer: base:3007ff65000 bufsz:9a000 memsz:9a000 add_buffer: base:3007ff60000 bufsz:3800 memsz:4000 add_buffer: base:3007ff55000 bufsz:80e0 memsz:a000 add_buffer: base:3007ff4f000 bufsz:437a memsz:437a add_buffer: base:3007d000000 bufsz:8fd240 memsz:2c1f000 add_buffer: base:30079562000 bufsz:3a9ca12 memsz:3a9ca12 ... # echo c > /proc/sysrq-trigger [ 707.078371] SysRq : Trigger a crash [ 707.082358] BUG: unable to handle kernel NULL pointer dereference at (null) [ 707.091232] IP: [<ffffffff815e4b06>] sysrq_handle_crash+0x16/0x20 [ 707.098170] PGD 0 [ 707.100533] Oops: 0002 [#1] SMP [ 707.104262] Modules linked in: [ 707.107753] CPU: 11 PID: 20796 Comm: bash Tainted: G I 3.10.0-rc5-yh-00891-g188560d-dirty #1736 [ 707.128620] task: ffff89de66e1a5a0 ti: ffff89de68bec000 task.ti: ffff89de68bec000 [ 707.137014] RIP: 0010:[<ffffffff815e4b06>] [<ffffffff815e4b06>] sysrq_handle_crash+0x16/0x20 [ 707.146651] RSP: 0018:ffff89de68bede48 EFLAGS: 00010096 [ 707.152634] RAX: 000000000000000f RBX: ffffffff82af27e0 RCX: ffff885efd9cf130 [ 707.160656] RDX: 0000000000000001 RSI: ffffffff8108edb0 RDI: 0000000000000063 [ 707.168687] RBP: ffff89de68bede48 R08: 0000000000000001 R09: 0000000000000001 [ 707.176716] R10: 0000000000000001 R11: 0000000000000002 R12: 0000000000000063 [ 707.184745] R13: 0000000000000286 R14: 0000000000000000 R15: 0000000000000001 [ 707.192774] FS: 00007f89bd578700(0000) GS:ffff885efd800000(0000) knlGS:0000000000000000 [ 707.201863] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 707.208342] CR2: 0000000000000000 CR3: 0000023e66deb000 CR4: 00000000001407e0 [ 707.216364] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 707.224390] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 707.232418] Stack: [ 707.234722] ffff89de68bede88 ffffffff815e52a2 ffff89de68bede88 0000000000000002 [ 707.243252] 0000000000000002 00007f89bd57d000 ffff89de68bedf50 0000000000000000 [ 707.251751] ffff89de68bedeb8 ffffffff815e53d0 00007f89bd86e290 00007f89bd57d000 [ 707.260235] Call Trace: [ 707.262996] [<ffffffff815e52a2>] __handle_sysrq+0xc2/0x1b0 [ 707.269278] [<ffffffff815e53d0>] write_sysrq_trigger+0x40/0x50 [ 707.275948] [<ffffffff81220f42>] proc_reg_write+0x42/0x80 [ 707.282133] [<ffffffff811c03eb>] vfs_write+0xeb/0x1c0 [ 707.287911] [<ffffffff811c0865>] SyS_write+0x55/0xb0 [ 707.293610] [<ffffffff820b23da>] tracesys+0xd4/0xd9 [ 707.299166] Code: f0 4c 8b 65 f8 c9 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 0f 1f 44 00 00 55 c7 05 cc ff a1 01 01 00 00 00 48 89 e5 0f ae f8 <c6> 04 25 00 00 00 00 01 5d c3 0f 1f 44 00 00 55 48 89 e5 53 48 [ 707.321648] RIP [<ffffffff815e4b06>] sysrq_handle_crash+0x16/0x20 [ 707.328623] RSP <ffff89de68bede48> [ 707.332573] CR2: 0000000000000000 early console in decompress_kernel decompress_kernel: input: [0x3007ea682c2-0x3007f35d8f5], output: 0x3007d000000, heap: [0x3007f365240-0x3007f36d23f] Decompressing Linux... xz... Parsing ELF... done. Booting the kernel. [ 0.000000] bootconsole [uart0] enabled [ 0.000000] real_mode_data : phys 000003007ff4f000 [ 0.000000] real_mode_data : virt ffff8b007ff4f000 [ 0.000000] boot_params : init virt ffffffff82f509e0 [ 0.000000] boot_params : phys 000003007ef509e0 [ 0.000000] boot_params : virt ffff8b007ef509e0 [ 0.000000] boot_command_line : init virt ffffffff82e24020 [ 0.000000] boot_command_line : phys 000003007ee24020 [ 0.000000] boot_command_line : virt ffff8b007ee24020 [ 0.000000] Kernel Layout: [ 0.000000] .text: [0x3007d000000-0x3007e0bfde0] [ 0.000000] .rodata: [0x3007e200000-0x3007e9c1fff] [ 0.000000] .data: [0x3007ea00000-0x3007ebb9abf] [ 0.000000] .init: [0x3007ebbb000-0x3007ef3bfff] [ 0.000000] .bss: [0x3007ef4a000-0x3007fbf9fff] [ 0.000000] .brk: [0x3007fbfa000-0x3007fc1efff] [ 0.000000] memblock_reserve: [0x0009ac00-0x000fffff] * BIOS reserved [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Linux version 3.9.0-yh-02267-g2413a4c-dirty (yhlu at linux-siqj.site) (gcc version 4.7.2 20130108 [gcc-4_7-branch revision 195012] (SUSE Linux) ) #1507 SMP Mon Apr 29 10:52:45 PDT 2013 [ 0.000000] memblock_reserve: [0x3007d000000-0x3007fbf9fff] TEXT DATA BSS [ 0.000000] memblock_reserve: [0x30079562000-0x3007cffefff] RAMDISK [ 0.000000] Command line: initcall_debug nr_cpus=1 pci=routeirq ignore_loglevel unknown_nmi_panic apic=debug ramdisk_size=262144 root=/dev/ram0 rw ip=dhcp console=uart8250,io,0x3f8,115200n8 memmap=exactmap memmap=616K at 4K memmap=131072K at 1900544K memmap=1047936K at 3222274048K elfcorehdr=3223321984K memmap=960K#1722776K memmap=13884K#1723736K [ 0.000000] KERNEL supported cpus: [ 0.000000] Intel GenuineIntel [ 0.000000] AMD AuthenticAMD [ 0.000000] Centaur CentaurHauls [ 0.000000] Physical RAM map: [ 0.000000] raw: [mem 0x0000000000000100-0x000000000009afff] usable [ 0.000000] raw: [mem 0x000000000009b000-0x000000000009ffff] reserved [ 0.000000] raw: [mem 0x00000000000e0000-0x00000000000fffff] reserved [ 0.000000] raw: [mem 0x0000000000100000-0x0000000068ad0fff] usable [ 0.000000] raw: [mem 0x0000000068ad1000-0x0000000069265fff] reserved [ 0.000000] raw: [mem 0x0000000069266000-0x0000000069355fff] ACPI data [ 0.000000] raw: [mem 0x0000000069356000-0x000000006a0e4fff] ACPI NVS [ 0.000000] raw: [mem 0x000000006a0e5000-0x000000006bd68fff] reserved [ 0.000000] raw: [mem 0x000000006bd69000-0x000000006bd98fff] usable [ 0.000000] raw: [mem 0x000000006bd99000-0x000000006bd99fff] reserved [ 0.000000] raw: [mem 0x000000006bd9a000-0x000000007bffffff] usable [ 0.000000] raw: [mem 0x0000000080000000-0x000000008fffffff] reserved [ 0.000000] raw: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved [ 0.000000] raw: [mem 0x00000000ff000000-0x00000000ffffffff] reserved [ 0.000000] raw: [mem 0x0000000100000000-0x000003007fffffff] usable [ 0.000000] e820: BIOS-provided physical RAM map (sanitized by setup): [ 0.000000] BIOS-e820: [mem 0x0000000000000100-0x000000000009afff] usable [ 0.000000] BIOS-e820: [mem 0x000000000009b000-0x000000000009ffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000000e0000-0x00000000000fffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000000100000-0x0000000068ad0fff] usable [ 0.000000] BIOS-e820: [mem 0x0000000068ad1000-0x0000000069265fff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000069266000-0x0000000069355fff] ACPI data [ 0.000000] BIOS-e820: [mem 0x0000000069356000-0x000000006a0e4fff] ACPI NVS [ 0.000000] BIOS-e820: [mem 0x000000006a0e5000-0x000000006bd68fff] reserved [ 0.000000] BIOS-e820: [mem 0x000000006bd69000-0x000000006bd98fff] usable [ 0.000000] BIOS-e820: [mem 0x000000006bd99000-0x000000006bd99fff] reserved [ 0.000000] BIOS-e820: [mem 0x000000006bd9a000-0x000000007bffffff] usable [ 0.000000] BIOS-e820: [mem 0x0000000080000000-0x000000008fffffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000fed1c000-0x00000000fed1ffff] reserved [ 0.000000] BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved [ 0.000000] BIOS-e820: [mem 0x0000000100000000-0x000003007fffffff] usable [ 0.000000] debug: ignoring loglevel setting. [ 0.000000] e820: last_pfn = 0x30080000 max_arch_pfn = 0x400000000 [ 0.000000] NX (Execute Disable) protection: active [ 0.000000] e820: user-defined physical RAM map: [ 0.000000] user: [mem 0x0000000000001000-0x000000000009afff] usable [ 0.000000] user: [mem 0x0000000069266000-0x000000006a0e4fff] ACPI data [ 0.000000] user: [mem 0x0000000074000000-0x000000007bffffff] usable [ 0.000000] user: [mem 0x0000030040000000-0x000003007ff5ffff] usable ...
