dovecot - Apr 2012 - segfaults with dovecot 2:2.1.5-0~auto+6 on debian squeeze

After upgrade from latest 2.1.4 to 2.1.5 occasional coredumps on lmtp/lda
daemon happens. It results in deffering mail in previous hop server and mail
delay

[1383350.925251] lmtp[22130]: segfault at 0 ip 00007f8829e2b4c5 sp
00007fff29fd37e0 error 4 in libdovecot-lda.so.0.0.0[7f8829e23000+b000]
[1383351.038095] lmtp[22121]: segfault at 0 ip 00007f18863084c5 sp
00007fff65d87b20 error 4 in libdovecot-lda.so.0.0.0[7f1886300000+b000]
[1383366.682285] lmtp[22101]: segfault at 0 ip 00007fe87a36a4c5 sp
00007fffb391b430 error 4 in libdovecot-lda.so.0.0.0[7fe87a362000+b000]
[1383530.705974] lmtp[22126]: segfault at 0 ip 00007f0a7caa74c5 sp
00007ffff5bd0050 error 4 in libdovecot-lda.so.0.0.0[7f0a7ca9f000+b000]
[1383530.844101] lmtp[17613]: segfault at 0 ip 00007f43aa1e84c5 sp
00007fff977ffd70 error 4 in libdovecot-lda.so.0.0.0[7f43aa1e0000+b000]
[1383544.463542] lmtp[17576]: segfault at 0 ip 00007fbec6bc64c5 sp
00007fff3e347910 error 4 in libdovecot-lda.so.0.0.0[7fbec6bbe000+b000]

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