[Dovecot] dovecot-lda segfaults

[Andre]

Hi to all.
Since version 2.0.3 (now I am running 2.0.5) I have experienced segfaults on mail delivery, either with dovecot-lda and lmtp.

At least I succeded in having a core dump, here is the backtrace:

#0  0x00007f1cca350160 in maildir_sync_set_new_msgs_count () from /usr/lib/dovecot/libdovecot-storage.so.0
#1  0x00007f1cca34df0a in maildir_transaction_save_commit_pre () from /usr/lib/dovecot/libdovecot-storage.so.0
#2  0x00007f1cca3491c3 in ?? () from /usr/lib/dovecot/libdovecot-storage.so.0
#3  0x00007f1cca382ef7 in mail_index_transaction_commit_full () from /usr/lib/dovecot/libdovecot-storage.so.0
#4  0x00007f1cca348e4b in index_transaction_commit () from /usr/lib/dovecot/libdovecot-storage.so.0
#5  0x00007f1cc8cccc8e in ?? () from /usr/lib/dovecot/modules/lib20_zlib_plugin.so
#6  0x00007f1cc8edaa31 in ?? () from /usr/lib/dovecot/modules/lib10_quota_plugin.so
#7  0x00007f1cca3281bd in mailbox_transaction_commit_get_changes () from /usr/lib/dovecot/libdovecot-storage.so.0
#8  0x00007f1cca3281fe in mailbox_transaction_commit () from /usr/lib/dovecot/libdovecot-storage.so.0
#9  0x00007f1cc8461fd7 in ?? () from /usr/lib/dovecot/libdovecot-sieve.so.0
#10 0x00007f1cc8459597 in ?? () from /usr/lib/dovecot/libdovecot-sieve.so.0
#11 0x00007f1cc845992b in sieve_result_execute () from /usr/lib/dovecot/libdovecot-sieve.so.0
#12 0x00007f1cc846973d in sieve_execute () from /usr/lib/dovecot/libdovecot-sieve.so.0
#13 0x00007f1cc869f83e in ?? () from /usr/lib/dovecot/modules/lib90_sieve_plugin.so
#14 0x00007f1cca0f4084 in mail_deliver () from /usr/lib/dovecot/libdovecot-lda.so.0
#15 0x0000000000402cf0 in main ()

I have tried to disable quota and zlib, but I suppose it is not related to those plugins.
What else can I try???
Andre