[Dovecot] Antwort: Antwort: Re: WG: on High Load using IMAPSYNC : Panic: file ostream-lzma.c: line 147: unreached. Dovecot 2.2.12 with zlib/XZ compression --> solved !

[Timo Sirainen]

On 6.5.2014, at 23.24, Robert Nowotny <rnowotny at rotek.at> wrote:

> when using xz compression, on high load (syncing thousands of emails) 
> dovecot panics with : Panic: file ostream-lzma.c: line 147: unreached
> 
> after some investigation I found out that the call 
> 
> ret = lzma_code(zs, LZMA_FINISH);
> 
> returns LZMA_OK (what is enumerated integer 0) sometimes.
> 
> again - this error will only show up under heavy load, for instance when 
> syncing a lot of emails to a new mailbox with imapsync or dsync.
> 
> After patching the file ostream-lzma.c as follows, it seems to work now 
> correctly.
> 
> Someone with more knowledge about the lzma library and that codepart 
> should probably look over it, before merging it into the code.

I think your change is ok, but I did a bit more changes to make it work exactly the same as the example included in xz-utils, just in case something else might be still wrong. http://hg.dovecot.org/dovecot-2.2/rev/8e6d98d34dbf