[mythtv-users] recent mythbackend crashing

[Eyal Lebedinsky]

On 30/05/2022 11.46, Gary Buhrmaster wrote:
> On Mon, May 30, 2022 at 1:02 AM Eyal Lebedinsky <eyal at eyal.emu.id.au> wrote:
>>
>> Running f34 up-to-date.
> 
> I'll point out that you have less than 10 days to move
> forward to a supported OS version (F34 goes EoL
> 2022-06-07)

An upgrade to f36 is already planned.

>> Recently, following an update of mythtv and the kernel, mythbackend started crahing even when not recording or watching.
>> Does anyone else see this?
> 
> Neither running either that almost obsolete
> OS version, or that version of MythTV, but
> you are going to have to install the debug
> packages and create a backtrace to provide
> useful diagnostics for the devs (instructions
> are on the wiki, as I recall)  I suspect (but
> obviously do not know) that is it more likely
> to be the mythtv upgrade than the kernel
> upgrade, but you should be able to boot
> into your previous kernel to verify if it is the
> kernel,

I will reboot into the previous kernel later, when the machine is idle.

> and do a dnf download on mythtv
> to verify if it is the mythtv version.  After that,
> git bisect should point to the errant commit.

I suspect a downgrade is not possible as, sadly, following the last update I see:

2022-05-29T08:39:31+1000 DEBUG ---> Package mythtv-backend.x86_64 31.0-25.173.20220120git4f7953f6ee.fc34 will be upgraded
...
2022-05-29T08:44:11+1000 DDEBUG RPM transaction start.
...
2022-05-29 08:46:29.212408 I [3031201/3031201] CoreContext schemawizard.cpp:117 (Compare) - Current MythTV Schema Version (DBSchemaVer): 1361
2022-05-29 08:46:29.213017 C [3031201/3031201] CoreContext dbutil.cpp:202 (BackupDB) - Database backups disabled.  Skipping backup.
2022-05-29 08:46:29.215371 I [3031201/3031201] CoreContext schemawizard.cpp:296 (PromptForUpgrade) - Console is non-interactive, can't prompt user...
2022-05-29 08:46:29.215372 C [3031201/3031201] CoreContext schemawizard.cpp:322 (PromptForUpgrade) - Upgrading.
2022-05-29 08:46:29.219095 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1362
2022-05-29 08:46:29.507241 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1363
2022-05-29 08:46:29.511737 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1365
2022-05-29 08:46:29.512042 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1366
2022-05-29 08:46:29.516049 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1367
2022-05-29 08:46:29.518575 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1368
2022-05-29 08:46:29.520665 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1369
2022-05-29 08:46:29.577198 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1370
2022-05-29 08:46:29.617520 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1371
2022-05-29 08:46:29.618345 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1372
2022-05-29 08:46:29.631449 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1373
2022-05-29 08:46:29.738391 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1374
2022-05-29 08:46:29.905354 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1375
2022-05-29 08:46:29.912370 C [3031201/3031201] CoreContext dbcheckcommon.cpp:119 (performActualUpdate) - Upgrading to MythTV schema version 1376
2022-05-29 08:46:29.912970 I [3031201/3031201] CoreContext dbcheck.cpp:428 (UpgradeTVDatabaseSchema) - Database schema upgrade complete.
...
## reboot

AFAIK a schema upgrade cannot be reversed.

-- 
Eyal Lebedinsky (eyal at eyal.emu.id.au)