cannot get kdump to work, kexec stops in load_segments()

cannot get kdump to work, kexec stops in load_segments()

[Jürgen Herrmann]

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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Re: cannot get kdump to work, kexec stops in load_segments()

[Jürgen Herrmann]

Am 20.9.2018 19:52, schrieb Jürgen Herrmann:
> 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

Anybody??

-- 
Jürgen Herrmann
https://t-5.eu
ALbertstraße 2
94327 Bogen

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