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Subject: Re: vmcore not getting created on linux-4.7
To: Steve Wise <swise@opengridcomputing.com>, linux-kernel@vger.kernel.org
References: <007001d1ce27$17845550$468cfff0$@opengridcomputing.com>
From: nborisov <n.borisov.lkml@gmail.com>
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Date: Fri, 24 Jun 2016 18:06:31 +0300
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On 24.06.2016 17:45, Steve Wise wrote:
> I've been trying to get crash dumps working on linux-4.7 and haven't succeeded.
> The kdump kernel boots up and appears to be chugging along and then just reboots
> and never creates the vmcore, and fails to create the vmcore-dmesg.txt, though
> I've never seen that working on my nodes.  Below is the tail of the boot.  
> 
> Any ideas? 
> 
> Saving to the local filesystem UUID=f63753d9-74a5-4db8-9b63-2fc1ba2b5f85
> e2fsck 1.42.12.wc1 (15-Sep-2014)
> /dev/sda2: recovering journal
> Setting free inodes count to 3490861 (was 3490926)
> Setting freeEXT4-fs (sda2): mounted filesystem with ordered data mode. Opts:
>  blocks count to 7307269 (was 7307159)
> /dev/sda2: clean, 678867/4169728 files, 9358331/16665600 blocks
> Free memory/Total memory (free %): 45936 / 112096 ( 40.9792 )
> Loading SELINUX policy
> SELinux:  Disabled at runtime.
> audit: type=1404 audit(1466753867.960:2): selinux=0 auid=4294967295
> ses=4294967295
> Policy load failed, a relabel will be required on reboot
> Saving vmcore-dmesg.txhpet1: lost 88 rtc interrupts
> t
> Missing the struct log size export
> Saving vmcore-dmesg.txt failed

Regarding the vmcore-dmesg failed, it's likely you are hitting this issue:

http://lists.infradead.org/pipermail/kexec/2012-July/006602.html

Can you try to download an compile the latest kexec tools from
git://git.kernel.org/pub/scm/utils/kernel/kexec/kexec-tools.git

Also what's the content of your /etc/kdump.conf file?

> umount: can't umount /mnt/selinux: Invalid argument
> sd 3:0:0:0: [sdb] Synchronizing SCSI cache
> sd 1:0:0:0: [sda] Synchronizing SCSI cache
> iw_cxgb4:0000:82:00.4: Detach
> reboot: Restarting system
> reboot: machine restart
>