2.3.3: Panic: file ostream-zlib.c: line 37 (o_stream_zlib_close): assertion failed

[Timo Sirainen]

On 2 Oct 2018, at 12.26, Tom Sommer <mail at tomsommer.dk> wrote:
> 
> I see this in my logs after 2.3.3:
> 
> using zlib plugin, ofc.
> 
> Oct 02 10:01:39 imap(user at example.com)<50643></2k4Sjp3vMqC496W>: Panic: file ostream-zlib.c: line 37 (o_stream_zlib_close): assertion failed: (zstream->ostream.finished || zstream->ostream.ostream.stream_errno != 0 || zstream->ostream.error_handling_disabled)
> Oct 02 10:01:39 imap(user at example.com)<50643></2k4Sjp3vMqC496W>: Error: Raw backtrace: /usr/lib64/dovecot/libdovecot.so.0(+0xce56a) [0x7f442487556a] -> /usr/lib64/dovecot/libdovecot.so.0(+0xce5b1) [0x7f44248755b1] -> /usr/lib64/dovecot/libdovecot.so.0(+0x3d941) [0x7f44247e4941] -> /usr/lib64/dovecot/lib20_zlib_plugin.so(+0x5cdf) [0x7f44233c4cdf] -> /usr/lib64/dovecot/libdovecot.so.0(+0xf4b46) [0x7f442489bb46] -> /usr/lib64/dovecot/libdovecot.so.0(o_stream_destroy+0x13) [0x7f442489be83] -> /usr/lib64/dovecot/libdovecot-storage.so.0(maildir_save_finish+0x173) [0x7f4424b93973] -> /usr/lib64/dovecot/libdovecot-storage.so.0(mailbox_save_cancel+0x36) [0x7f4424b68696] -> dovecot/imap [user at example.com X.X.X.X APPEND](+0xede9) [0x55a9d7e86de9] -> dovecot/imap [user at example.com X.X.X.X APPEND](command_exec+0x65) [0x55a9d7e956e5] -> dovecot/imap [user at example.com X.X.X.X APPEND](+0xf9e6) [0x55a9d7e879e6] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_call_io+0x55) [0x7f442488c275] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0xbf) [0x7f442488e13f] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_handler_run+0x55) [0x7f442488c365] -> /usr/lib64/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7f442488c588] -> /usr/lib64/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f4424808053] -> dovecot/imap [user at example.com X.X.X.X APPEND](main+0x32d) [0x55a9d7ea20dd] -> /lib64/libc.so.6(__libc_start_main+0x100) [0x7f4424431d20] -> dovecot/imap [user at example.com X.X.X.X APPEND](+0xe419) [0x55a9d7e86419]
> 
> No clue how to reproduce

It crashes if client disconnects during APPEND, but only with Maildir and zlib plugin. The bug already existed in earlier v2.3.x releases though.