RE: vmcore not getting created on linux-4.7

[Steve Wise]

> -----Original Message-----
> From: nborisov [mailto:n.borisov.lkml@xxxxxxxxx]
> Sent: Friday, June 24, 2016 10:07 AM
> To: Steve Wise; linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: vmcore not getting created on linux-4.7
> 
> 
> 
> 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
> 

I did build/install kexec-tools-2.0.12. 

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

#raw /dev/sda5
#ext4 /dev/sda3
#ext4 LABEL=/boot
#ext4 UUID=03138356-5e61-4ab3-b58e-27507ac41937
#net my.server.com:/export/tmp
#net user@xxxxxxxxxxxxx
path /var/crash
#ext4 /dev/nvme0n1
core_collector makedumpfile -c --message-level 1 -d 31
#core_collector makedumpfile -c --message-level 1 -d 17
#core_collector scp
#core_collector cp --sparse=always
#extra_bins /bin/cp
#link_delay 60
#kdump_post /var/crash/scripts/kdump-post.sh
#extra_bins /usr/bin/lftp
#disk_timeout 30
#extra_modules gfs2
#options modulename options
#default shell
#debug_mem_level 0
#force_rebuild 1
#sshkey /root/.ssh/kdump_id_rsa