Seeking in opus files leads to PANIC

Salutation: this Rockbox is some pretty awesome software!

Hardware: Sansa Clip Zip, AMSv2 variant 1
Software: boot 4.0; 515a3c5-140924, and others

Problem: Seeking or bookmark starts with opus files may cause Rockbox to 
crash.

When I seek files encoded with the Opus codec (.opus extension, in an 
Ogg container), the system may occasionally crash and present the 
following screen:

----------------
  *PANIC*
  Stkov codec
pc:300685E8 sp:3
     A: 30091AF8
bt end
----------------
Any keypress reboots the unit, but any attempt to restart playback of 
the offending file will then generate this screen:

----------------
Undefined instru




----------------

Any keypress again reboots the unit, but the system will /not/ 
successfully play the offending file again until the system is powered 
down normally and powered back up. In addition, the problem is not 
necessarily limited to seeking activity. In some circumstances, if the 
file is restarted partway through via a bookmark, the above panic is 
also manifest. I have not noticed the issue in any other codecs (e.g. 
Vorbis). And the issue is not affected by the setting of 
[Settings->Playback Settings->Frequency] (IIRC Opus files decode 
uniformly at 48kHz regardless of the sample rate of the source material).

The problem is more likely to manifest itself when the file is long (not 
necessarily large). I routinely play opus files over 2h runtime at 
bitrates =< 32kbits/s.

If problematic files are started at the beginning, and never seeked, the 
panic will not occur during play and file playback will end normally.

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