kdump issues with 4.11 kernel

Gurumurthy, Anil Anil.Gurumurthy at cavium.com
Tue Nov 28 21:29:25 PST 2017 

Hello,
  I was facing trouble getting a crash dump on 4.11 kernel. Debugging a bit, I see that the kexec run from the cmd line fails. Any ideas on what I could be missing?

[root at localhost ~]# kexec -p /boot/vmlinuz-`uname -r` --initrd=/boot/initramfs-`uname -r`kdump.img
ELF core (kcore) parse failed
Cannot load /boot/vmlinuz-4.11.12+

[root at localhost ~]# ls -l /boot/vmlinuz-4.11.12+
-rw-r--r--. 1 root root 6404384 Nov 23 12:14 /boot/vmlinuz-4.11.12+
[root at localhost ~]# cat /sys/kernel/kexec_crash_size
134217728
[root at localhost ~]# cat /proc/iomem | grep -i crash
  30000000-37ffffff : Crash kernel

[root at localhost ~]# kexec -p /boot/vmlinuz-`uname -r` --initrd=/boot/initramfs-`uname -r`kdump.img -d
kernel: 0x7fa8ba785010 kernel_size: 0x61b920
MEMORY RANGES
0000000000000100-000000000006bfff (0)
000000000006c000-000000000006cfff (3)
000000000006d000-000000000009efff (0)
000000000009f000-000000000009ffff (3)
0000000000100000-000000004578d017 (0)
000000004578d018-00000000457aee57 (0)
00000000457aee58-00000000457af017 (0)
00000000457af018-00000000457d0e57 (0)
00000000457d0e58-00000000457d1017 (0)
00000000457d1018-00000000457f2e57 (0)
00000000457f2e58-00000000457f3017 (0)
00000000457f3018-0000000045814e57 (0)
0000000045814e58-0000000045815017 (0)
0000000045815018-000000004584ec57 (0)
000000004584ec58-000000004584f017 (0)
000000004584f018-0000000045888c57 (0)
0000000045888c58-000000005d13c017 (0)
000000005d13c018-000000005d14b057 (0)
000000005d14b058-000000005d14c017 (0)
000000005d14c018-000000005d15f657 (0)
000000005d15f658-000000005d184fff (0)
000000005d185000-000000005d185fff (2)
000000005d186000-000000005fb76fff (0)
000000005fb77000-000000005fb7bfff (1)
000000005fb7c000-000000005ffe0fff (0)
000000005ffe1000-000000005ffe1fff (2)
000000005ffe2000-000000005fff9fff (0)
000000005fffa000-0000000060001fff (2)
0000000060002000-0000000060009fff (0)
000000006000a000-000000006000afff (2)
000000006000b000-000000006000bfff (0)
000000006000c000-0000000060011fff (2)
0000000060012000-00000000600ddfff (0)
00000000600de000-00000000600e0fff (2)
00000000600e1000-00000000600e2fff (1)
00000000600e3000-00000000600e4fff (2)
00000000600e5000-00000000606e2fff (0)
00000000606e3000-00000000606e3fff (2)
00000000606e4000-0000000060e52fff (0)
0000000060e53000-0000000060e53fff (2)
0000000060e54000-00000000735d9fff (0)
00000000735da000-00000000735e6fff (1)
00000000735e7000-0000000074413fff (0)
0000000074414000-000000007e892fff (1)
000000007e893000-000000007eb9efff (3)
000000007eb9f000-000000007ec01fff (0)
0000000080000000-000000008fffffff (1)
00000000fed1c000-00000000fed1ffff (1)
00000000ff800000-00000000ffffffff (1)
0000000100000000-0000000a7fffffff (0)
0000000000000000-0000000000000fff : reserved
0000000000001000-000000000006bfff : System RAM
000000000006c000-000000000006cfff : ACPI Non-volatile Storage
000000000006d000-000000000009efff : System RAM
000000000009f000-000000000009ffff : ACPI Non-volatile Storage
00000000000a0000-00000000000bffff : PCI Bus 0000:00
00000000000c0000-00000000000c7fff : Video ROM
00000000000f0000-00000000000fffff : System ROM
0000000000100000-000000004578d017 : System RAM
0000000030000000-0000000037ffffff : Crash kernel
000000004578d018-00000000457aee57 : System RAM
00000000457aee58-00000000457af017 : System RAM
00000000457af018-00000000457d0e57 : System RAM
00000000457d0e58-00000000457d1017 : System RAM
00000000457d1018-00000000457f2e57 : System RAM
00000000457f2e58-00000000457f3017 : System RAM
00000000457f3018-0000000045814e57 : System RAM
0000000045814e58-0000000045815017 : System RAM
0000000045815018-000000004584ec57 : System RAM
000000004584ec58-000000004584f017 : System RAM
000000004584f018-0000000045888c57 : System RAM
0000000045888c58-000000005d13c017 : System RAM
000000005d13c018-000000005d14b057 : System RAM
000000005d14b058-000000005d14c017 : System RAM
000000005d14c018-000000005d15f657 : System RAM
000000005d15f658-000000005d184fff : System RAM
000000005d185000-000000005d185fff : ACPI Tables
000000005d186000-000000005fb76fff : System RAM
000000005fb77000-000000005fb7bfff : reserved
000000005fb7c000-000000005ffe0fff : System RAM
000000005ffe1000-000000005ffe1fff : ACPI Tables
000000005ffe2000-000000005fff9fff : System RAM
000000005fffa000-0000000060001fff : ACPI Tables
0000000060002000-0000000060009fff : System RAM
000000006000a000-000000006000afff : ACPI Tables
000000006000b000-000000006000bfff : System RAM
000000006000c000-0000000060011fff : ACPI Tables
0000000060012000-00000000600ddfff : System RAM
00000000600de000-00000000600e0fff : ACPI Tables
00000000600e1000-00000000600e2fff : reserved
00000000600e3000-00000000600e4fff : ACPI Tables
00000000600e5000-00000000606e2fff : System RAM
00000000606e3000-00000000606e3fff : ACPI Tables
00000000606e4000-0000000060e52fff : System RAM
0000000060e53000-0000000060e53fff : ACPI Tables
0000000060e54000-00000000735d9fff : System RAM
00000000735da000-00000000735e6fff : reserved
00000000735e7000-0000000074413fff : System RAM
0000000074414000-000000007e892fff : reserved
000000007e893000-000000007eb9efff : ACPI Non-volatile Storage
000000007eb9f000-000000007ec01fff : System RAM
000000007ec02000-000000007fffffff : RAM buffer
0000000080000000-000000008fffffff : PCI MMCONFIG 0000 [bus 00-ff]
0000000080000000-000000008fffffff : reserved
0000000090000000-00000000c3ff7fff : PCI Bus 0000:80
0000000090000000-0000000090003fff : 0000:80:04.0
0000000090000000-0000000090003fff : ioatdma
0000000090004000-0000000090007fff : 0000:80:04.1
0000000090004000-0000000090007fff : ioatdma
0000000090008000-000000009000bfff : 0000:80:04.2
0000000090008000-000000009000bfff : ioatdma
000000009000c000-000000009000ffff : 0000:80:04.3
000000009000c000-000000009000ffff : ioatdma
0000000090010000-0000000090013fff : 0000:80:04.4
0000000090010000-0000000090013fff : ioatdma
0000000090014000-0000000090017fff : 0000:80:04.5
0000000090014000-0000000090017fff : ioatdma
0000000090018000-000000009001bfff : 0000:80:04.6
0000000090018000-000000009001bfff : ioatdma
000000009001c000-000000009001ffff : 0000:80:04.7
000000009001c000-000000009001ffff : ioatdma
00000000c3ff8000-00000000c3ff8fff : dmar0
00000000c4000000-00000000fbff7fff : PCI Bus 0000:00
00000000c4000000-00000000c40fffff : PCI Bus 0000:20
00000000c4000000-00000000c403ffff : 0000:20:00.0
00000000c4040000-00000000c407ffff : 0000:20:00.1
00000000c42fd000-00000000c42fd3ff : 0000:00:1a.0
00000000c42fd000-00000000c42fd3ff : ehci_hcd
00000000c42fe000-00000000c42fe3ff : 0000:00:1d.0
00000000c42fe000-00000000c42fe3ff : ehci_hcd
00000000c42ff000-00000000c42ff7ff : 0000:00:1f.2
00000000c42ff000-00000000c42ff7ff : ahci
00000000c4300000-00000000c43fffff : PCI Bus 0000:16
00000000c4300000-00000000c431ffff : 0000:16:00.0
00000000c43bc000-00000000c43bffff : 0000:16:00.0
00000000c43bc000-00000000c43bffff : megasas: LSI
00000000c43c0000-00000000c43fffff : 0000:16:00.0
00000000c4400000-00000000c45fffff : PCI Bus 0000:06
00000000c4470000-00000000c4473fff : 0000:06:00.0
00000000c4470000-00000000c4473fff : igb
00000000c4474000-00000000c4493fff : 0000:06:00.0
00000000c4494000-00000000c44b3fff : 0000:06:00.0
00000000c44b4000-00000000c44b7fff : 0000:06:00.1
00000000c44b4000-00000000c44b7fff : igb
00000000c44b8000-00000000c44d7fff : 0000:06:00.1
00000000c44d8000-00000000c44f7fff : 0000:06:00.1
00000000c44f8000-00000000c44fbfff : 0000:06:00.2
00000000c44f8000-00000000c44fbfff : igb
00000000c44fc000-00000000c451bfff : 0000:06:00.2
00000000c451c000-00000000c453bfff : 0000:06:00.2
00000000c453c000-00000000c453ffff : 0000:06:00.3
00000000c453c000-00000000c453ffff : igb
00000000c4540000-00000000c455ffff : 0000:06:00.3
00000000c4560000-00000000c457ffff : 0000:06:00.3
00000000c4580000-00000000c459ffff : 0000:06:00.0
00000000c4580000-00000000c459ffff : igb
00000000c45a0000-00000000c45bffff : 0000:06:00.1
00000000c45a0000-00000000c45bffff : igb
00000000c45c0000-00000000c45dffff : 0000:06:00.2
00000000c45c0000-00000000c45dffff : igb
00000000c45e0000-00000000c45fffff : 0000:06:00.3
00000000c45e0000-00000000c45fffff : igb
00000000c4600000-00000000c4ffffff : PCI Bus 0000:01
00000000c4600000-00000000c4ffffff : PCI Bus 0000:02
00000000c4600000-00000000c46fffff : PCI Bus 0000:05
00000000c4700000-00000000c4ffffff : PCI Bus 0000:03
00000000c4700000-00000000c4ffffff : PCI Bus 0000:04
00000000c47fc000-00000000c47fffff : 0000:04:00.0
00000000c47fc000-00000000c47fffff : mgadrmfb_mmio
00000000c4800000-00000000c4ffffff : 0000:04:00.0
00000000c5000000-00000000c5ffffff : PCI Bus 0000:01
00000000c5000000-00000000c5ffffff : PCI Bus 0000:02
00000000c5000000-00000000c5ffffff : PCI Bus 0000:03
00000000c5000000-00000000c5ffffff : PCI Bus 0000:04
00000000c5000000-00000000c5ffffff : 0000:04:00.0
00000000c5000000-00000000c5ffffff : mgadrmfb_vram
00000000c60e0000-00000000c60e3fff : 0000:00:04.0
00000000c60e0000-00000000c60e3fff : ioatdma
00000000c60e4000-00000000c60e7fff : 0000:00:04.1
00000000c60e4000-00000000c60e7fff : ioatdma
00000000c60e8000-00000000c60ebfff : 0000:00:04.2
00000000c60e8000-00000000c60ebfff : ioatdma
00000000c60ec000-00000000c60effff : 0000:00:04.3
00000000c60ec000-00000000c60effff : ioatdma
00000000c60f0000-00000000c60f3fff : 0000:00:04.4
00000000c60f0000-00000000c60f3fff : ioatdma
00000000c60f4000-00000000c60f7fff : 0000:00:04.5
00000000c60f4000-00000000c60f7fff : ioatdma
00000000c60f8000-00000000c60fbfff : 0000:00:04.6
00000000c60f8000-00000000c60fbfff : ioatdma
00000000c60fc000-00000000c60fffff : 0000:00:04.7
00000000c60fc000-00000000c60fffff : ioatdma
00000000c6100000-00000000c63fffff : PCI Bus 0000:20
00000000c61fa000-00000000c61fafff : 0000:20:00.0
00000000c61fa000-00000000c61fafff : qla2xxx
00000000c61fb000-00000000c61fbfff : 0000:20:00.1
00000000c61fb000-00000000c61fbfff : qla2xxx
00000000c61fc000-00000000c61fdfff : 0000:20:00.0
00000000c61fc000-00000000c61fdfff : qla2xxx
00000000c61fe000-00000000c61fffff : 0000:20:00.1
00000000c61fe000-00000000c61fffff : qla2xxx
00000000c6200000-00000000c62fffff : 0000:20:00.0
00000000c6200000-00000000c62fffff : qla2xxx
00000000c6300000-00000000c63fffff : 0000:20:00.1
00000000c6300000-00000000c63fffff : qla2xxx
00000000fbff8000-00000000fbff8fff : dmar1
00000000fec00000-00000000fecfffff : PNP0003:00
00000000fec00000-00000000fec003ff : IOAPIC 0
00000000fec01000-00000000fec013ff : IOAPIC 1
00000000fec40000-00000000fec403ff : IOAPIC 2
00000000fed00000-00000000fed003ff : HPET 0
00000000fed00000-00000000fed003ff : PNP0103:00
00000000fed1b000-00000000fed1bfff : pnp 00:01
00000000fed1c000-00000000fed1ffff : reserved
00000000fed1f410-00000000fed1f414 : iTCO_wdt.0.auto
00000000fed40000-00000000fedfffff : PCI Bus 0000:00
00000000fed40000-00000000fed44fff : TPM
00000000fee00000-00000000feefffff : pnp 00:01
00000000fee00000-00000000fee00fff : Local APIC
00000000ff800000-00000000ffffffff : reserved
0000000100000000-0000000a7fffffff : System RAM
00000007e7600000-00000007e7d62a60 : Kernel code
00000007e7d62a61-00000007e838c9ff : Kernel data
00000007e85c6000-00000007e88dcfff : Kernel bss
0000038000000000-00000387ffffffff : PCI Bus 0000:00
0000038800000000-0000038fffffffff : PCI Bus 0000:80
get_backup_area: 0000000000001000-000000000006bfff : System RAM
CRASH MEMORY RANGES
0000000000000000-0000000000000fff (1)
0000000000001000-000000000006bfff (0)
000000000006c000-000000000006cfff (3)
000000000006d000-000000000009efff (0)
000000000009f000-000000000009ffff (3)
0000000000100000-000000002fffffff (0)
0000000038000000-000000004578d017 (0)
000000004578d018-00000000457aee57 (0)
00000000457aee58-00000000457af017 (0)
00000000457af018-00000000457d0e57 (0)
00000000457d0e58-00000000457d1017 (0)
00000000457d1018-00000000457f2e57 (0)
00000000457f2e58-00000000457f3017 (0)
00000000457f3018-0000000045814e57 (0)
0000000045814e58-0000000045815017 (0)
0000000045815018-000000004584ec57 (0)
000000004584ec58-000000004584f017 (0)
000000004584f018-0000000045888c57 (0)
0000000045888c58-000000005d13c017 (0)
000000005d13c018-000000005d14b057 (0)
000000005d14b058-000000005d14c017 (0)
000000005d14c018-000000005d15f657 (0)
000000005d15f658-000000005d184fff (0)
000000005d185000-000000005d185fff (2)
000000005d186000-000000005fb76fff (0)
000000005fb77000-000000005fb7bfff (1)
000000005fb7c000-000000005ffe0fff (0)
000000005ffe1000-000000005ffe1fff (2)
000000005ffe2000-000000005fff9fff (0)
000000005fffa000-0000000060001fff (2)
0000000060002000-0000000060009fff (0)
000000006000a000-000000006000afff (2)
000000006000b000-000000006000bfff (0)
000000006000c000-0000000060011fff (2)
0000000060012000-00000000600ddfff (0)
00000000600de000-00000000600e0fff (2)
00000000600e1000-00000000600e2fff (1)
00000000600e3000-00000000600e4fff (2)
00000000600e5000-00000000606e2fff (0)
00000000606e3000-00000000606e3fff (2)
00000000606e4000-0000000060e52fff (0)
0000000060e53000-0000000060e53fff (2)
0000000060e54000-00000000735d9fff (0)
00000000735da000-00000000735e6fff (1)
00000000735e7000-0000000074413fff (0)
0000000074414000-000000007e892fff (1)
000000007e893000-000000007eb9efff (3)
000000007eb9f000-000000007ec01fff (0)
0000000080000000-000000008fffffff (1)
00000000fed1c000-00000000fed1ffff (1)
00000000ff800000-00000000ffffffff (1)
0000000100000000-0000000a7fffffff (0)
kernel load physical addr start = 0x00000007e7600000
ELF core (kcore) parse failed
Cannot load /boot/vmlinuz-4.11.12+

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