[systemd-devel] kexec reboot fails and reboots in normal cold boot way

[Paul Menzel]

Dear Prashantkumar,


Am 14.06.22 um 10:39 schrieb Prashantkumar dhotre:

> In  systemd 243.2+ version, intermittently sometimes I see that 'systemctl
> kexec' does not result in kexec reboot but results in reguler cold boot
> reboot

The upstream list only gives support for the last two systemd releases. 
Please try with these first, and if not, please contact the support of 
your distribution.

(I doubt it’s a systemd issue though, and more a Linux kernel or other 
configuration issue. If you manually reboot with kexec, does it always 
work?)

> In console logs, I see below logs.
> At line#209, I see "FAIL" string but not sure where it is coming from.
> In which cases do 'systemctl kexec' can fail and result in non-kexec
> reguler reboot?
> 
> 
>   185 2022-06-13 13:56:18 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39m/data/var/home/root/.ssh^[[0m.^M
>   186 2022-06-13 13:56:18 [^[[0;1;31mFAILED^[[0m] Failed unmounting
> ^[[0;1;39m/etc^[[0m.^M
>   187 2022-06-13 13:56:18 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39m/soft/uswitch^[[0m.^M
>   188 2022-06-13 13:56:18 [^[[0;32m  OK  ^[[0m] Unmo[ 1130.272883]
> systemd-shutdown[1]: Could not deactivate swap /sda3: Transport endpoint is
> not
>       connected^M
>   189 2022-06-13 13:56:18 unted ^[[0;1;39m/u^[[0m.^M
>   190 2022-06-13 13:56:18 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39m/usr/conf^[[0m.^M
>   191 2022-06-13 13:56:18 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39m/usr/evo/share^[[0m.^M
>   192 2022-06-13 13:56:18 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39m/uswitch/data/var/external^[[0m.^M
>   193 2022-06-13 13:56:18 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39m/uswitch/dev^[[0m.^M
>   194 2022-06-13 13:56:18 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39m/uswitch/proc^[[0m.^M
>   195 2022-06-13 13:56:18 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39m/uswitch/soft^[[0m.^M
>   196 2022-06-13 13:56:18 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39m/uswitch/tmp^[[0m.^M
>   197 2022-06-13 13:56:18 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39m/var/db^[[0m.^M
>   198 2022-06-13 13:56:19 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39m/var/etc^[[0m.^M
>   199 2022-06-13 13:56:19 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39m/var/pfe^[[0m.^M
>   200 2022-06-13 13:56:19 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39m/var/rundb^[[0m.^M
>   201 2022-06-13 13:56:19 [^[[0;32m  OK  ^[[0m] Unmounted
> ^[[0;1;39mTemporary Directory (/tmp)^[[0m.^M
>   202 2022-06-13 13:56:19 [^[[0;32m  OK  ^[[0m] Stopped target
> ^[[0;1;39mSwap^[[0m.^M
>   203 2022-06-13 13:56:19          Deactivating swap
> ^[[0;1;39m/sda3^[[0m...^M
>   204 2022-06-13 13:56:19          Unmounting ^[[0;1;39m/data/var^[[0m...^M
>   205 2022-06-13 13:56:19          Unmounting ^[[0;1;39m/soft^[[0m...^M
>   206 2022-06-13 13:56:19          Unmounting
> ^[[0;1;39m/uswitch/data/var^[[0m...^M
>   207 2022-06-13 13:56:19          Unmounting ^[[0;1;39m/var^[[0m...[
> 1131.454830] reboot: Restarting system^M
>   208 2022-06-13 13:56:19 ^M
>   209 2022-06-13 13:56:19 [^[[0;1;31mFAIL^[c^M
>   210 2022-06-13 13:56:19 Booting from Flash A^M
>   211 2022-06-13 13:56:19 ^M
>   212 2022-06-13 13:56:19 FPGA Reset Reason = 0x80^M
>   213 2022-06-13 13:56:19 ^M
>   214 2022-06-13 13:56:20 Primary BIOS version CBDE_P_LIG0_00.25.1^M

Please annotate the paste, and make sure the paste is also not wrapped 
(by Google Mail) after 72(?) characters. Currently it’s hard to read.

You also missed to provide details about your system, the Linux kernel 
version. You might want to set the log level to debug, and the log gives 
more clues [1]:

     systemd-analyze set-log-level debug

The systemd Wiki page *Debuggingo [2] also documents more ways on how to 
debug problems.


Kind regards,

Paul


[1]: 
https://unix.stackexchange.com/questions/566190/how-can-i-get-the-current-systemd-log-level-and-change-it
[2]: https://freedesktop.org/wiki/Software/systemd/Debugging/