pigeonhole 0.4.22 with sieve_before script crashes

[Jan]

Hello!

Dovecot 2.2.34 (874deae)
Pigeonhole version 0.4.22 (22940fb7)

After the update to pigeonhole version 0.4.22 the following
configuration does not work. With version 0.4.21 it works.

dovecot.conf (only sieve configuration)
---------------------------------------------------------------
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope 
encoded-character vacation subaddress comparator-i;ascii-numeric 
relational regex imap4flags copy include variables body enotify 
environment mailbox date index ihave duplicate mime foreverypart 
extracttext editheader
sieve = file:~/sieve;active=~/.dovecot.sieve
sieve_before = /etc/dovecot/sieve/filter
sieve_extensions = +editheader
sieve_max_script_size = 1M
service managesieve-login {
   inet_listener sieve {
     port = 4190
   }
}
protocol sieve {
   mail_max_userip_connections = 10
   managesieve_implementation_string = Sieve
   managesieve_logout_format = bytes=%i/%o
}
---------------------------------------------------------------

sieve_before script for all users (/etc/dovecot/sieve/filter)
---------------------------------------------------------------
require ["editheader"];

if header :contains "X-Spam-Flag" "YES" {
   addheader "X-Filter-Junk-Flag" "YES";
   addheader "X-Filter-Junk-Type" "SPAM";
}
elsif header :contains "X-Amavis-Alert" "INFECTED" {
   addheader "X-Filter-Junk-Flag" "YES";
   addheader "X-Filter-Junk-Type" "VIRUS";
}
elsif header :contains "X-Amavis-Alert" "BANNED" {
   addheader "X-Filter-Junk-Flag" "YES";
   addheader "X-Filter-Junk-Type" "ATTACHMENT";
}
else {
   addheader "X-Filter-Junk-Flag" "NO";
   addheader "X-Filter-Junk-Type" "NONE";
}
---------------------------------------------------------------

sieve script for user postbox at example.com (.dovecot.sieve)
---------------------------------------------------------------
require ["copy"];
if allof (header :is "X-Filter-Junk-Flag" "NO")
{
   redirect :copy "copy at example.com";
}
---------------------------------------------------------------

I use LMTP to deliver the mail to the user and the
following error occurs:

Mar  3 02:31:34 test dovecot: lmtp(postbox at example.com): Panic: file 
istream.c: line 197 (i_stream_read): assertion failed: 
((size_t)ret+old_size == _stream->pos - _stream->skip)
Mar  3 02:31:34 test dovecot: lmtp(postbox at example.com): Error: Raw 
backtrace: /usr/local/lib/dovecot/libdovecot.so.0(+0x9c7a0) 
[0x7f8c015be7a0] -> /usr/local/lib/dovecot/libdovecot.so.0(+0x9c88c) 
[0x7f8c015be88c] -> /usr/local/lib/dovecot/libdovecot.so.0(i_fatal+0) 
[0x7f8c0155294d] -> 
/usr/local/lib/dovecot/libdovecot.so.0(i_stream_read+0x2c8) 
[0x7f8c015c99d8] -> 
/usr/local/lib/dovecot/libdovecot.so.0(i_stream_read_data+0x3d) 
[0x7f8c015ca15d] -> 
/usr/local/lib/dovecot/libdovecot.so.0(message_parse_header_next+0x63) 
[0x7f8c015a72e3] -> /usr/local/lib/dovecot/libdovecot.so.0(+0x7efb1) 
[0x7f8c015a0fb1] -> 
/usr/local/lib/dovecot/libdovecot.so.0(i_stream_read+0x53) 
[0x7f8c015c9763] -> 
/usr/local/lib/dovecot/libdovecot.so.0(i_stream_read_data+0x3d) 
[0x7f8c015ca15d] -> 
/usr/local/lib/dovecot/libdovecot.so.0(io_stream_copy+0x75) 
[0x7f8c015df1a5] -> /usr/local/lib/dovecot/libdovecot.so.0(+0xbf5e0) 
[0x7f8c015e15e0] -> 
/usr/local/lib/dovecot/libdovecot.so.0(o_stream_send_istream+0x33) 
[0x7f8c015df003] -> 
/usr/local/lib/dovecot/libdovecot-sieve.so.0(+0x4dbf4) [0x7f8bfbb3abf4] 
-> /usr/local/lib/dovecot/libdovecot-sieve.so.0(+0x3f22a) 
[0x7f8bfbb2c22a] -> 
/usr/local/lib/dovecot/libdovecot-sieve.so.0(sieve_result_execute+0x27f) 
[0x7f8bfbb2da6f] -> 
/usr/local/lib/dovecot/libdovecot-sieve.so.0(+0x502ee) [0x7f8bfbb3d2ee] 
-> 
/usr/local/lib/dovecot/libdovecot-sieve.so.0(sieve_multiscript_run+0xa6) 
[0x7f8bfbb3def6] -> 
/usr/local/lib/dovecot/lib90_sieve_plugin.so(+0x379a) [0x7f8bfbda279a] 
-> /usr/local/lib/dovecot/libdovecot-lda.so.0(mail_deliver+0xa2) 
[0x7f8c01b9d942] -> dovecot/lmtp [DATA 127.0.0.1 postbox at example.com]() 
[0x406c0b] -> 
/usr/local/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x52) 
[0x7f8c015d3c22] -> 
/usr/local/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0xea) 
[0x7f8c015d51ca] -> 
/usr/local/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x3c) 
[0x7f8c015d3cbc] -> 
/usr/local/lib/dovecot/libdovecot.so.0(io_loop_run+0x38) 
[0x7f8c015d3e68] -> 
/usr/local/lib/dovecot/libdovecot.so.0(master_service_run+0x13) 
[0x7f8c0155caa3] -> dovecot/lmtp [DATA 127.0.0.1 
postbox at example.com](main+0x18c) [0x404fbc] -> 
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf5) [0x7f8c01198b45] 
-> dovecot/lmtp [DATA 127.0.0.1 postbox at example.com]() [0x405065]
Mar  3 02:31:34 test dovecot: lmtp(postbox at example.com): Fatal: master: 
service(lmtp): child 13445 killed with signal 6 (core dumps disabled)

If I change the sieve script for this user, it works.
For example:
---------------------------------------------------------------
require ["copy"];
if allof (header :is "X-Filter-Junk-Status" "NO")
{
   redirect :copy "copy at example.com";
}
---------------------------------------------------------------

The error occurs only in version 0.4.22, not in version 0.4.21.

Thanks,
Jan