Comment 15 for bug 1635597

------- Comment From <email address hidden> 2017-08-23 08:54 EDT-------
Retested kdump today (23rd Aug 2017) on Ubuntu1610 and kdump hangs still:
-------------------------
root@thymelp3:~# echo c> /proc/sysrq-trigger
[ 1314.534126] sysrq: SysRq : Trigger a crash
[ 1314.534139] Unable to handle kernel paging request for data at address 0x00000000
[ 1314.534143] Faulting instruction address: 0xc0000000006a2428
[ 1314.534147] Oops: Kernel access of bad area, sig: 11 [#1]
[ 1314.534150] SMP NR_CPUS=2048 NUMA pSeries
[ 1314.534154] Modules linked in: nfsv3 nfs_acl rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache binfmt_misc pseries_rng vmx_crypto sunrpc ip_tables x_tables autofs4 dm_round_robin btrfs xor raid6_pq lpfc crc32c_vpmsum be2net scsi_transport_fc scsi_dh_emc scsi_dh_rdac scsi_dh_alua dm_multipath
[ 1314.534177] CPU: 9 PID: 3421 Comm: bash Not tainted 4.8.0-59-generic #64-Ubuntu
[ 1314.534181] task: c0000003efc25200 task.stack: c0000000fb970000
[ 1314.534184] NIP: c0000000006a2428 LR: c0000000006a3478 CTR: c0000000006a2400
[ 1314.534187] REGS: c0000000fb9739f0 TRAP: 0300 Not tainted (4.8.0-59-generic)
[ 1314.534190] MSR: 8000000000009033 <SF,EE,ME,IR,DR,RI,LE> CR: 28222222 XER: 00000001
[ 1314.534198] CFAR: c000000000008750 DAR: 0000000000000000 DSISR: 42000000 SOFTE: 1
GPR00: c0000000006a3478 c0000000fb973c70 c000000001467500 0000000000000063
GPR04: c0000003ff64aca0 c0000003ff65fb40 c0000003ff380000 00000000000080a0
GPR08: 0000000000000007 0000000000000001 0000000000000000 0000000000000001
GPR12: c0000000006a2400 c000000007b35100 0000000000000000 0000000022000000
GPR16: 0000000010170dc8 000001000bbf0258 0000000010140528 00000000100c6f60
GPR20: 0000000000000000 000000001017dd58 0000000010152bf0 000000001017b608
GPR24: 00003fffd72098a4 00003fffd72098a0 c00000000137e6e0 0000000000000004
GPR28: c00000000137eaa0 0000000000000063 c000000001332590 0000000000000000
[ 1314.534242] NIP [c0000000006a2428] sysrq_handle_crash+0x28/0x30
[ 1314.534246] LR [c0000000006a3478] __handle_sysrq+0xe8/0x280
[ 1314.534248] Call Trace:
[ 1314.534250] [c0000000fb973c70] [c0000000006a3458] __handle_sysrq+0xc8/0x280 (unreliable)
[ 1314.534255] [c0000000fb973d10] [c0000000006a3bcc] write_sysrq_trigger+0x6c/0x90
[ 1314.534260] [c0000000fb973d40] [c0000000003adb48] proc_reg_write+0x88/0xd0
[ 1314.534265] [c0000000fb973d70] [c0000000003105ac] __vfs_write+0x3c/0x70
[ 1314.534268] [c0000000fb973d90] [c000000000311814] vfs_write+0xd4/0x240
[ 1314.534272] [c0000000fb973de0] [c000000000313368] SyS_write+0x68/0x110
[ 1314.534276] [c0000000fb973e30] [c000000000009584] system_call+0x38/0xec
[ 1314.534279] Instruction dump:
[ 1314.534281] 60000000 60000000 3c4c00dc 38425100 7c0802a6 60000000 3d22001a 3949bc60
[ 1314.534288] 39200001 912a0000 7c0004ac 39400000 <992a0000> 4e800020 3c4c00dc 384250d0
[ 1314.534296] ---[ end trace efc32115f1d43c62 ]---
[ 1314.537099]
[ 1314.537123] Sending IPI to other CPUs
[ 1314.538149] IPI complete
I'm in purgatory
-> smp_release_cpus()
spinning_secondaries = 8
<- smp_release_cpus()
[ 0.172393] pci 001b:50:00.0: of_irq_parse_pci() failed with rc=-22
[ 0.425077] Kernel panic - not syncing: Out of memory and no killable processes...
[ 0.425077]
[ 0.425100] CPU: 2 PID: 1 Comm: swapper/1 Not tainted 4.8.0-59-generic #64-Ubuntu
[ 0.425102] Call Trace:
[ 0.425105] [c00000000d10b220] [c000000008b0fe4c] dump_stack+0xb0/0xf0 (unreliable)
[ 0.425110] [c00000000d10b260] [c000000008b0bf58] panic+0x144/0x308
[ 0.425114] [c00000000d10b2f0] [c000000008249c2c] out_of_memory+0x48c/0x570
[ 0.425117] [c00000000d10b3a0] [c000000008250ad8] __alloc_pages_nodemask+0xdf8/0xe20
[ 0.425122] [c00000000d10b560] [c0000000082c6da8] alloc_page_interleave+0x58/0xc0
[ 0.425126] [c00000000d10b5a0] [c0000000082c7678] alloc_pages_current+0x168/0x1d0
[ 0.425130] [c00000000d10b600] [c0000000082435e8] __page_cache_alloc+0x118/0x160
[ 0.425134] [c00000000d10b640] [c0000000082437b4] pagecache_get_page+0x184/0x3c0
[ 0.425138] [c00000000d10b6b0] [c000000008243a34] grab_cache_page_write_begin+0x44/0x70
[ 0.425142] [c00000000d10b6e0] [c00000000834bf6c] simple_write_begin+0x4c/0x1b0
[ 0.425146] [c00000000d10b730] [c000000008243264] generic_perform_write+0x104/0x280
[ 0.425150] [c00000000d10b7d0] [c000000008245540] __generic_file_write_iter+0x1e0/0x230
[ 0.425154] [c00000000d10b830] [c00000000824567c] generic_file_write_iter+0xec/0x250
[ 0.425158] [c00000000d10b870] [c00000000831050c] new_sync_write+0xec/0x150
[ 0.425162] [c00000000d10b900] [c000000008311814] vfs_write+0xd4/0x240
[ 0.425165] [c00000000d10b950] [c000000008313368] SyS_write+0x68/0x110
[ 0.425169] [c00000000d10b9a0] [c000000008ea5d0c] xwrite+0x4c/0xb0
[ 0.425173] [c00000000d10b9e0] [c000000008ea5e60] do_copy+0xf0/0x170
[ 0.425176] [c00000000d10ba10] [c000000008ea59c4] write_buffer+0x5c/0x88
[ 0.425180] [c00000000d10ba40] [c000000008ea5a50] flush_buffer+0x60/0xec
[ 0.425183] [c00000000d10ba90] [c000000008eec4c8] __gunzip+0x378/0x47c
[ 0.425187] [c00000000d10bb10] [c000000008ea650c] unpack_to_rootfs+0x1c8/0x338
[ 0.425191] [c00000000d10bbc0] [c000000008ea688c] populate_rootfs+0x94/0x17c
[ 0.425195] [c00000000d10bc40] [c00000000800b948] do_one_initcall+0x68/0x1d0
[ 0.425198] [c00000000d10bd00] [c000000008ea42e8] kernel_init_freeable+0x278/0x360
[ 0.425202] [c00000000d10bdc0] [c00000000800c1b4] kernel_init+0x24/0x170
[ 0.425206] [c00000000d10be30] [c0000000080098f0] ret_from_kernel_thread+0x5c/0x6c
[ 0.429518] ---[ end Kernel panic - not syncing: Out of memory and no killable processes...

root@thymelp3:~# service kdump-tools status
* kdump-tools.service - Kernel crash dump capture service
Loaded: loaded (/lib/systemd/system/kdump-tools.service; enabled; vendor pres
Active: active (exited) since Wed 2017-08-23 07:17:33 CDT; 21min ago
Main PID: 2644 (code=exited, status=0/SUCCESS)
Tasks: 0 (limit: 6144)
CGroup: /system.slice/kdump-tools.service

root@thymelp3:~# uname -a
Linux thymelp3 4.8.0-59-generic #64-Ubuntu SMP Thu Jun 29 19:36:04 UTC 2017 ppc64le ppc64le ppc64le GNU/Linux
root@thymelp3:~# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.10
DISTRIB_CODENAME=yakkety
DISTRIB_DESCRIPTION="Ubuntu 16.10"

root@thymelp3:~# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinux-4.8.0-59-generic root=UUID=f0727a66-9209-45bf-b622-01c3612611e1 ro crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M splash quiet crashkernel=384M-:128M

Looking at "makedumpfile" verison on the machine:
----------------------------
root@thymelp3:~# apt list --installed|grep makedumpfile

makedumpfile/yakkety-updates,now 1:1.6.0-2ubuntu1.2 ppc64el [installed,automatic]

Still version of makedumpfile older and it is not 1:1.6.1-2