Questions about kexec-tools (resend to list)

Philip Prindeville philipp at fedoraproject.org
Fri Mar 10 11:09:20 PST 2017 

> On Mar 8, 2017, at 10:29 PM, Pratyush Anand <panand at redhat.com> wrote:
> 
> On Wednesday 08 March 2017 10:59 PM, Philip Prindeville wrote:
>> CRASH MEMORY RANGES
>> 0000000000000005-ffffffffffffffff (1)
>> 0000000000000005-ffffffffffffffff (0)
>> 0000000000000005-ffffffffffffffff (1)
>> 0000000000000005-ffffffffffffffff (1)
>> 0000000000000005-ffffffffffffffff (0)
>> 0000000000000005-ffffffffffffffff (3)
>> 0000000000000005-ffffffffffffffff (0)
>> 0000000000000005-ffffffffffffffff (1)
>> 0000000000000005-ffffffffffffffff (0)
>> 0000000000000005-ffffffffffffffff (1)
>> 0000000000000005-ffffffffffffffff (2)
>> 0000000000000005-ffffffffffffffff (3)
>> 0000000000000005-ffffffffffffffff (1)
>> 0000000000000005-ffffffffffffffff (0)
>> 0000000000000005-ffffffffffffffff (1)
>> 0000000000000005-ffffffffffffffff (1)
>> 0000000000000005-ffffffffffffffff (1)
>> 0000000000000005-ffffffffffffffff (1)
>> 0000000000000005-ffffffffffffffff (1)
>> 0000000000000005-ffffffffffffffff (1)
>> 0000000000000005-ffffffffffffffff (1)
>> 0000000000000005-ffffffffffffffff (0)
>> 0000000000000130-00007f18b2a21938 (0)
> 
> No sure whats going here..but above does not look good. It should have values from  /proc/iomem.

For comparison, here’s what /proc/iomem looks like:

root at PowercodeBMU:/# cat /proc/iomem
00000000-00000fff : reserved
00001000-00099bff : System RAM
00099c00-0009ffff : reserved
000a0000-000bffff : PCI Bus 0000:00
000c0000-000cebff : Video ROM
000d0000-000d3fff : PCI Bus 0000:00
000d4000-000d7fff : PCI Bus 0000:00
000d8000-000dbfff : PCI Bus 0000:00
000dc000-000dffff : PCI Bus 0000:00
000e0000-000fffff : reserved
  000e0000-000e3fff : PCI Bus 0000:00
  000e4000-000e7fff : PCI Bus 0000:00
  000f0000-000fffff : System ROM
00100000-cc309fff : System RAM
  01000000-01483d1a : Kernel code
  01483d1b-016b897f : Kernel data
  01777000-017f1fff : Kernel bss
  34000000-37ffffff : Crash kernel
cc30a000-cc310fff : ACPI Non-volatile Storage
cc311000-cc946fff : System RAM
cc947000-ccb5bfff : reserved
ccb5c000-db8b4fff : System RAM
db8b5000-db957fff : reserved
db958000-db96dfff : ACPI Tables
db96e000-dbac3fff : ACPI Non-volatile Storage
dbac4000-dbffefff : reserved
dbfff000-dbffffff : System RAM
dd000000-df1fffff : reserved
df200000-feafffff : PCI Bus 0000:00
  e0000000-efffffff : 0000:00:02.0
  f0000000-f04fffff : PCI Bus 0000:02
    f0000000-f01fffff : 0000:02:00.1
      f0000000-f01fffff : ixgbe
    f0200000-f03fffff : 0000:02:00.0
      f0200000-f03fffff : ixgbe
    f0400000-f0403fff : 0000:02:00.1
      f0400000-f0403fff : ixgbe
    f0404000-f0407fff : 0000:02:00.0
      f0404000-f0407fff : ixgbe
  f0600000-f0afffff : PCI Bus 0000:01
    f0600000-f07fffff : 0000:01:00.1
      f0600000-f07fffff : ixgbe
    f0800000-f09fffff : 0000:01:00.0
      f0800000-f09fffff : ixgbe
    f0a00000-f0a03fff : 0000:01:00.1
      f0a00000-f0a03fff : ixgbe
    f0a04000-f0a07fff : 0000:01:00.0
      f0a04000-f0a07fff : ixgbe
  f6000000-f63fffff : 0000:00:02.0
  f6400000-f66fffff : PCI Bus 0000:0a
    f6400000-f64fffff : 0000:0a:00.0
    f6500000-f65fffff : 0000:0a:00.0
      f6500000-f65fffff : igb
    f6600000-f6603fff : 0000:0a:00.0
      f6600000-f6603fff : igb
  f6700000-f69fffff : PCI Bus 0000:09
    f6700000-f67fffff : 0000:09:00.0
    f6800000-f68fffff : 0000:09:00.0
      f6800000-f68fffff : igb
    f6900000-f6903fff : 0000:09:00.0
      f6900000-f6903fff : igb
  f6a00000-f6cfffff : PCI Bus 0000:08
    f6a00000-f6afffff : 0000:08:00.0
    f6b00000-f6bfffff : 0000:08:00.0
      f6b00000-f6bfffff : igb
    f6c00000-f6c03fff : 0000:08:00.0
      f6c00000-f6c03fff : igb
  f6d00000-f6ffffff : PCI Bus 0000:07
    f6d00000-f6dfffff : 0000:07:00.0
    f6e00000-f6efffff : 0000:07:00.0
      f6e00000-f6efffff : igb
    f6f00000-f6f03fff : 0000:07:00.0
      f6f00000-f6f03fff : igb
  f7000000-f72fffff : PCI Bus 0000:06
    f7000000-f70fffff : 0000:06:00.0
    f7100000-f71fffff : 0000:06:00.0
      f7100000-f71fffff : igb
    f7200000-f7203fff : 0000:06:00.0
      f7200000-f7203fff : igb
  f7300000-f75fffff : PCI Bus 0000:05
    f7300000-f73fffff : 0000:05:00.0
    f7400000-f74fffff : 0000:05:00.0
      f7400000-f74fffff : igb
    f7500000-f7503fff : 0000:05:00.0
      f7500000-f7503fff : igb
  f7600000-f78fffff : PCI Bus 0000:04
    f7600000-f76fffff : 0000:04:00.0
    f7700000-f77fffff : 0000:04:00.0
      f7700000-f77fffff : igb
    f7800000-f7803fff : 0000:04:00.0
      f7800000-f7803fff : igb
  f7900000-f7bfffff : PCI Bus 0000:03
    f7900000-f79fffff : 0000:03:00.0
    f7a00000-f7afffff : 0000:03:00.0
      f7a00000-f7afffff : igb
    f7b00000-f7b03fff : 0000:03:00.0
      f7b00000-f7b03fff : igb
  f7c00000-f7c0ffff : 0000:00:14.0
    f7c00000-f7c0ffff : xhci-hcd
  f7c11000-f7c110ff : 0000:00:1f.3
  f7c12000-f7c127ff : 0000:00:1f.2
    f7c12000-f7c127ff : ahci
  f7c14000-f7c1400f : 0000:00:16.0
  f7fdf000-f7fdffff : pnp 00:09
  f7fe0000-f7feffff : pnp 00:09
  f8000000-fbffffff : reserved
    f8000000-fbffffff : pnp 00:09
fec00000-fec00fff : reserved
  fec00000-fec003ff : IOAPIC 0
fed00000-fed03fff : reserved
  fed00000-fed003ff : HPET 0
    fed00000-fed003ff : PNP0103:00
fed10000-fed17fff : pnp 00:09
fed18000-fed18fff : pnp 00:09
fed19000-fed19fff : pnp 00:09
fed1c000-fed1ffff : reserved
  fed1c000-fed1ffff : pnp 00:09
    fed1f410-fed1f414 : iTCO_wdt.0.auto
      fed1f410-fed1f414 : iTCO_wdt
fed20000-fed3ffff : pnp 00:09
fed40000-fed44fff : pnp 00:00
fed45000-fed8ffff : pnp 00:09
fed90000-fed93fff : pnp 00:09
fee00000-fee00fff : Local APIC
  fee00000-fee00fff : reserved
ff000000-ffffffff : reserved
  ff000000-ffffffff : INT0800:00
    ff000000-ffffffff : pnp 00:09
100000000-41fdfffff : System RAM
41fe00000-41fffffff : RAM buffer
root at PowercodeBMU:/# 


> 
>> Cannot get kernel page_offset_base symbol address
>> kernel symbol _stext vaddr =      a0000000005
>> kernel vaddr = 0xffffffff81000000 size = 0x818000
>> Memmap after adding segment
>> 0000000000000000-000000000009ffff (0)
>> Cannot load /tmp/boot/boot/vmlinuz
> 
> Above wrong ranges might be the reason of failure most likely in crash_create_elf**_headers().
> 
> 
> ~Pratyush

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