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Re: [Bacula-devel] bacula-sd hanging after tape gets full + unload (2.5.19)


Hello,

Le Thursday 13 November 2008 17:03:10 Pasi Kärkkäinen, vous avez écrit :
> Hello list!
>
> I'm using Bacula 2.5.19 and trying 'copy jobs' feature to copy jobs from
> disk volumes/pools to tape.
>
> Sometimes bacula-sd seems to get stuck.. it hangs without doing anything.
> Now it happened when tape got full and Bacula started to change the tape on
> the drive (using autoloader):
>
> bacula-sd JobId 3082: Start Copying JobId 3082,
> Job=CopyPool4UncopiedToTape.2008-11-13_10.53.04.54 bacula-sd JobId 3082:
> Using Device "IBM-LTO3-Drive"
> bacula-sd JobId 3082: Ready to read from volume "Pool4-Vol-0127" on device
> "FSDevice4" (/mnt/backup1/pool04). bacula-sd JobId 3082: Forward spacing
> Volume "Pool4-Vol-0127" to file:block 0:218. bacula-sd JobId 3082: End of
> Volume "756NNNL3" at 764:10067 on device "IBM-LTO3-Drive" (/dev/nst0).
> Write of 64512 bytes got -1. bacula-sd JobId 3082: Re-read of last block
> succeeded.
> bacula-sd JobId 3082: End of medium on Volume "756NNNL3"
> Bytes=725,237,130,240 Blocks=11,241,894 at 13-Nov-2008 11:51. bacula-sd
> JobId 3082: 3307 Issuing autochanger "unload slot 3, drive 0" command.
>
> <nothing happens after this>
>
>
> *sta
> Status available for:
>      1: Director
>      2: Storage
>      3: Client
>      4: All
> Select daemon type for status (1-4): 2
>
> ...
>
> Device status:
> Autochanger "IBM-LTO3-AutoChanger" with devices:
>    "IBM-LTO3-Drive" (/dev/nst0)
> Device "FSDevice0" (/mnt/backup1/pool00) is not open.
> Device "FSDevice1" (/mnt/backup1/pool01) is not open.
> Device "FSDevice2" (/mnt/backup1/pool02) is not open.
> Device "FSDevice3" (/mnt/backup1/pool03) is not open.
> Device "FSDevice4" (/mnt/backup1/pool04) is mounted with:
>     Volume:      Pool4-Vol-0127
>     Pool:        Pool4
>     Media type:  File4
>     Total Bytes Read=1,649,507,328 Blocks Read=25,569 Bytes/block=64,512
>     Positioned at File=0 Block=1,649,507,534
> Device "IBM-LTO3-Drive" (/dev/nst0) is not open.
>     Device is being initialized.
>     Drive 0 is not loaded.
> ====
>
> Used Volume status:
>
> <hangs here and nothing happens>
>
>
> I can exit bconsole by pressing CTRL+C multiple times.. if I restart
> bconsole and run that again, it gets stuck again..
>
> I tried 'strace -p <pid>' to see what bacula-sd is doing:
>
> # strace -p 7339
> Process 7339 attached - interrupt to quit
> select(5, [4], NULL, NULL, NULL <unfinished ...>
> Process 7339 detached
>
> So.. bacula-sd seems to be stuck on select() ..
>
> Running 'mtx' seems to work fine.. at the same time when bacula-sd is
> stuck.
>
> # mtx -f /dev/sg3 status
>   Storage Changer /dev/sg3:1 Drives, 8 Slots ( 0 Import/Export )
> Data Transfer Element 0:Empty
>       Storage Element 1:Full :VolumeTag=179MMML3
>       Storage Element 2:Full :VolumeTag=658NNNL3
>       Storage Element 3:Full :VolumeTag=756NNNL3
>       Storage Element 4:Full :VolumeTag=177MMML3
>       Storage Element 5:Full :VolumeTag=655NNNL3
>       Storage Element 6:Full :VolumeTag=656NNNL3
>       Storage Element 7:Full :VolumeTag=657NNNL3
>       Storage Element 8:Full :VolumeTag=CLNU38L1
>
>
> Any ideas how to fix this? Other than restarting Bacula..

Could you stop all daemons with a sigsegv to force a backtrace ?
killall -SEGV bacula-sd bacula-dir

(you will find 2 kind of file, *traceback and *bactrace in working directory)

After, if you can put results to pastbin, it will give information about your 
problem.

Bye

> I don't see any IO errors in dmesg and/or messages.
>
> -- Pasi

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