[Help] Cyrus 2.4.17 segfault

[Simon Matter]

> Hello,
>
>   we are experiencing a strange problem on cyrus-imapd 2.4.17.
>
> An user user/a has full ACL to another mailbox user/b. When the user/a
> SELECT a folder on user/b where he has access the imap process crashes.
>
> $ telnet cyrus.example.com 143
> Trying 10.10.10.10 ...
> Connected to cyrus.example.com.
> Escape character is '^]'.
> * OK [CAPABILITY IMAP4rev1 LITERAL+ ID ENABLE AUTH=PLAIN SASL-IR]
> cyrus.example.com Cyrus IMAP v2.4.17-Invoca-RPM-2.4.17-6.el6 server ready
> a authenticate plain dsfrrFwaWNlQGNzaS5pdABveGN5cnVzAENdfsdfMx
> a OK [CAPABILITY IMAP4rev1 LITERAL+ ID ENABLE ACL RIGHTS=kxte QUOTA
> MAILBOX-REFERRALS NAMESPACE UIDPLUS NO_ATOMIC_RENAME UNSELECT CHILDREN
> MULTIAPPEND BINARY CATENATE CONDSTORE ESEARCH SORT SORT=MODSEQ
> SORT=DISPLAY THREAD=ORDEREDSUBJECT THREAD=REFERENCES ANNOTATEMORE
> LIST-EXTENDED WITHIN QRESYNC SCAN XLIST URLAUTH URLAUTH=BINARY
> X-NETSCAPE LOGINDISABLED COMPRESS=DEFLATE IDLE] Success (no protection)
> SESSIONID=<cyrus-4400-1573486341-1>
> a SELECT "user/b/SOME THINGS/WATER"
> Connection closed by foreign host.
>
>
> Could you suggest me some way to resolve this problem?

I don't know but if it's a bug then it's probably solved in current
version 2.4.20.

Simon