Actually it also happens with just "quota_vsizes = true"
Mar 19 17:37:55 lmtp(xxx@xxx.xx): Panic: file file-lock.c: line 269: unreached Mar 19 17:37:55 lmtp(xxx@xxxx.xxx): Error: Raw backtrace: /usr/lib/dovecot/libdovecot.so.0 [0x35f647e07a] -> /usr/lib/dovecot/libdovecot.so.0 [0x35f647e0e6] -> /usr/lib/dovecot/libdovecot.so.0 [0x35f647d4ac] -> /usr/lib/dovecot/libdovecot.so.0 [0x35f6481edf] -> /usr/lib/dovecot/libdovecot.so.0(file_wait_lock_error+0x3a) [0x35f648205a] -> /usr/lib/dovecot/libdovecot.so.0(file_try_lock_error+0x13) [0x35f6482123] -> /usr/lib/dovecot/libdovecot.so.0(file_create_locked+0x284) [0x35f647f7a4] -> /usr/lib/dovecot/libdovecot-storage.so.0 [0x35f6068ec4] -> /usr/lib/dovecot/libdovecot-storage.so.0(index_mailbox_vsize_update_wait_lock+0xe) [0x35f6068f2e] -> /usr/lib/dovecot/libdovecot-storage.so.0(index_mailbox_get_virtual_size+0x3d) [0x35f606919d] -> /usr/lib/dovecot/libdovecot-storage.so.0(index_mailbox_get_metadata+0x321) [0x35f606fcd1] -> /usr/lib/dovecot/libdovecot-storage.so.0 [0x35f60485a0] -> /usr/lib/dovecot/libdovecot-storage.so.0 [0x35f60593ce] -> /usr/lib/dovecot/libdovecot-storage.so.0(mailbox_get_metadata+0x6e) [0x35f603404e] -> /usr/lib/dovecot/lib10_quota_plugin.so(quota_count+0xe7) [0x2b3e7464c417] -> /usr/lib/dovecot/lib10_quota_plugin.so [0x2b3e7464d89d] -> /usr/lib/dovecot/lib10_quota_plugin.so [0x2b3e7464dba5] -> /usr/lib/dovecot/lib10_quota_plugin.so(quota_get_resource+0x77) [0x2b3e7464a4b7] -> /usr/lib/dovecot/lib10_quota_plugin.so(quota_test_alloc+0x191) [0x2b3e7464a8f1] -> /usr/lib/dovecot/lib10_quota_plugin.so [0x2b3e746505f5] -> /usr/lib/dovecot/libdovecot-storage.so.0(mailbox_save_begin+0x5e) [0x35f6032eae] -> /usr/lib/dovecot/libdovecot-storage.so.0(mail_storage_copy+0x66) [0x35f602ac26] -> /usr/lib/dovecot/libdovecot-storage.so.0(maildir_copy+0x56) [0x35f60435d6] -> /usr/lib/dovecot/lib10_quota_plugin.so [0x2b3e7465071d] -> /usr/lib/dovecot/libdovecot-storage.so.0(mailbox_copy+0x7a) [0x35f6032cea] -> /usr/lib/dovecot/libdovecot-lda.so.0(mail_deliver_save+0x1ba) [0x35f680813a] -> /usr/lib/dovecot/libdovecot-lda.so.0(mail_deliver+0xf3) [0x35f68084c3] -> dovecot/lmtp [DATA 172.17.165.5 xxxx@xxxx.xx] [0x40645c]
// Tom