Hello!
I am trying to debug a hang in btrfs-send: I talked to the guys on the
linux-btrfs
mailing list and they need a kdump of the state when the hang happens.
I already set up kdump:
$ kdump-config show
DUMP_MODE: kdump
USE_KDUMP: 1
KDUMP_SYSCTL: kernel.panic_on_oops=1
KDUMP_COREDIR: /var/crash
crashkernel addr: 0x24000000
/vmlinuz: symbolic link to boot/vmlinuz-4.15.0-34-generic
kdump initrd:
/initrd.img: symbolic link to boot/initrd.img-4.15.0-34-generic
current state: ready to kdump
kexec command:
/sbin/kexec -p -d --command-line="BOOT_IMAGE=/vmlinuz-4.18.6
root=UUID=a914c141-72bf-448b-847f-d64ee82d8b7b ro rootflags=subvol=@
quiet splash vt.handoff=1 nr_cpus=1 systemd.unit=kdump-tools.service
irqpoll nousb ata_piix.prefer_ms_hyperv=0" --initrd=/initrd.img /vmlinuz
Kernel version is 4.18.6 from kernel.org
CPU: Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz
I did a little digging in the kernel code with printk() statements and
the execution stops in arch/x86/kernel/machine_kexec_64.c in function
load_segments(). The last printk I see is before the call of
load_segments().
A screenshot of the "test-crash" can be seen here:
https://t-5.eu/owncloud/index.php/s/WCxoNuSqnKVg6J7
What else do I need to provide in terms of information?
Best regards,
Jürgen
--
Jürgen Herrmann
https://t-5.eu
ALbertstraße 2
94327 Bogen
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