I use dovecot-1.1.10 and dovecot-sieve-1.1.6

/usr/local/libexec/dovecot/deliver coredups several times per day with bt like this:

(gdb) bt #0 0x0000000800a3a91c in kill () at kill.S:2 #1 0x0000000800a3a88a in __raise (s=6) at /usr/src/lib/libc/gen/raise.c:46 #2 0x0000000800a38f83 in abort () at /usr/src/lib/libc/stdlib/abort.c:65 #3 0x00000000004a7de5 in default_fatal_finish (type=LOG_TYPE_PANIC, status=0) at failures.c:151 #4 0x00000000004a8777 in i_syslog_fatal_handler (type=Could not find the frame base for "i_syslog_fatal_handler". ) at failures.c:309 #5 0x00000000004a80ca in i_panic (format=Could not find the frame base for "i_panic". ) at failures.c:198 #6 0x0000000800e0b265 in unfold_header ( str=0x800c55a40 "\"firm ru\nÐ\217Ð\201бЌ¬® Ñ\236Ò\220Ð\216¬ бвÒ\220аг\" ") at sieve-cmu.c:90 #7 0x0000000800e0b381 in unfold_multiline_headers (headers=0x800c55a30) at sieve-cmu.c:119 #8 0x0000000800e0b406 in getheader (v=0x7fffffffeab0, phead=0x800c5a160 "to", body=0x7fffffffc048) at sieve-cmu.c:132 #9 0x0000000800e1affc in eval_bc_test (interp=0x800c2d380, body_cache=0x0, m=0x7fffffffeab0, bc=0x800c5a000, ip=0x7fffffffc300) at bc_eval.c:541 #10 0x0000000800e1ac96 in eval_bc_test (interp=0x800c2d380, body_cache=0x0, m=0x7fffffffeab0, bc=0x800c5a000, ip=0x7fffffffd8e4) at bc_eval.c:445 #11 0x0000000800e1c131 in sieve_eval_bc (exe=0x800c240b0, is_incl=0, i=0x800c2d380, body_cache=0x0, sc=0x7fffffffeb60, m=0x7fffffffeab0, imapflags=0x7fffffffda20, actions=0x800c660f0, notify_list=0x800c13a40, errmsg=0x7fffffffda38) at bc_eval.c:1009 #12 0x0000000800e23ece in sieve_execute_bytecode (exe=0x800c240b0, interp=0x800c2d380, script_context=0x7fffffffeb60, message_context=0x7fffffffeab0) at script.c:868 #13 0x0000000800e0dee4 in cmu_sieve_run (namespaces=0x800c0b848, storage_r=0x7fffffffec98, mail=0x800c1d848, script_path=0x800c02d28 "/home/public/.dovecot.sieve", destaddr=0x7fffffffef3e "user_xxxxx", username=0x800c1ce35 "user_xxxxx", mailbox=0x4c581c "INBOX") at sieve-cmu.c:1038 #14 0x0000000800e0ae6d in cmusieve_deliver_mail (namespaces=0x800c0b848, storage_r=0x7fffffffec98, mail=0x800c1d848, destaddr=0x7fffffffef3e "user_xxxxx", mailbox=0x4c581c "INBOX") at cmusieve-plugin.c:81 #15 0x0000000000417d7f in main (argc=3, argv=0x7fffffffedc8) at deliver.c:1084

I log messages: deliver(user_xxxxx): Panic: file sieve-cmu.c: line 90 (unfold_header): assertion failed: (str[i] == ' ' || str[i] == '\t')

-- Anton Yuzhaninov