Package: general
Severity: normal
Dear Maintainer,
*** Reporter, please consider answering these questions, where appropriate ***
* What led up to the situation?
When on iSCSI root, Debian freezes after sending the SysRq-c signal. SysRq-c
signal works in a frozen state just fine. I am aware about the fact that Linux
cannot save the crashdump on iSCSI, so I configured the NFS resource for a
crashdump. However, I don't see on an NFS server any network activity
indicating that Debian tries to access the NFS share.
* What exactly did you do (or not do) that was effective (or
ineffective)?
I have configured the kdump as follows:
# kdump-config show
DUMP_MODE: kdump
USE_KDUMP: 1
KDUMP_SYSCTL: kernel.panic_on_oops=1
KDUMP_COREDIR: /var/crash
crashkernel addr: 0x15000000
/var/lib/kdump/vmlinuz: symbolic link to /boot/vmlinuz-4.16.0-1-amd64
kdump initrd:
/var/lib/kdump/initrd.img: symbolic link to
/var/lib/kdump/initrd.img-4.16.0-1-amd64
NFS: 10.0.2.4:/data/esx/kdump
NFS_TIMEO: 600
NFS_RETRANS 3
HOSTTAG: hv22
current state: ready to kdump
kexec command:
/sbin/kexec -p --command-line="BOOT_IMAGE=/boot/vmlinuz-4.16.0-1-amd64
root=UUID=4e04292f-93d9-4020-acc3-fa7c3bb1ab88 intel_iommu=on iommu=pt
modprobe.blacklist=nouveau quiet nr_cpus=1 systemd.unit=kdump-tools.service
irqpoll nousb ata_piix.prefer_ms_hyperv=0" --initrd=/var/lib/kdump/initrd.img
/var/lib/kdump/vmlinuz
NFS share is accessible from the freezing host when just mounting it.
* What was the outcome of this action?
Actual outcome is that Debian freezes as soon as I send the SysRq-c.
* What outcome did you expect instead?
Expected output would be: system dumps kernel core on an NFS share.
*** End of the template - remove these template lines ***
-- System Information:
Debian Release: buster/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Kernel: Linux 4.16.0-1-amd64 (SMP w/56 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968), LANGUAGE=C
(charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
