Segfault on selecting mailbox twice in a row

[John van der Kamp]

Hi,

I was doing some testing with new 2.2 changes. I’m using commit 15d5b8a from origin/master-2.2. The setup is using imapc to connect to a different imap server.
If I use the following commands, dovecot will crash every time:

A login username password
B select inbox
C select inbox

The logfile snippit is at the end of the mail. Let me know if you need more information.

John


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Feb 15 15:43:06 imap(user1 at domain.com): Debug: imapc: root=/tmp/tmpVuVTYr/dovecot1/users/user1 at domain.com/imapc, index=, indexpvt=, control=, inbox=, alt=
Feb 15 15:43:06 imap(user1 at domain.com): Debug: maildir++: root=/tmp/tmpVuVTYr/dovecot1/users/user1 at domain.com/imapc, index=, indexpvt=, control=, inbox=, alt=
Feb 15 15:43:09 imap(user1 at domain.com): Debug: INBOX: Mailbox opened because: SELECT
Feb 15 15:43:12 imap(user1 at domain.com): Debug: INBOX: Mailbox opened because: SELECT
Feb 15 15:43:14 imap(user1 at domain.com): Error: Log synchronization error at seq=2,offset=80372 for /tmp/tmpVuVTYr/dovecot1/users/user1 at domain.com/imapc/.INBOX/dovecot.index: Append with UID 10, but next_uid = 10421
Feb 15 15:43:14 imap(user1 at domain.com): Warning: fscking index file /tmp/tmpVuVTYr/dovecot1/users/user1 at domain.com/imapc/.INBOX/dovecot.index
Feb 15 15:43:14 imap(user1 at domain.com): Warning: imapc(127.0.0.1:31513): Mailbox 'INBOX' state corrupted: Expunged message uid=10 reappeared - reconnecting (delay 0 ms)
Feb 15 15:43:14 imap(user1 at domain.com): Debug: imapc(127.0.0.1:31513): Disconnected
Feb 15 15:43:14 imap(user1 at domain.com): Debug: imapc(127.0.0.1:31513): Looking up IP address (reconnect_ok=false, last_connect=1518705794)
Feb 15 15:43:14 imap(user1 at domain.com): Debug: imapc(127.0.0.1:31513): Connecting to 127.0.0.1:31513
Feb 15 15:43:14 imap(user1 at domain.com): Panic: file imapc-client.c: line 410 (imapc_client_mailbox_reconnect): assertion failed: (!box->reconnecting)
Feb 15 15:43:14 imap(user1 at domain.com): Error: Raw backtrace: /usr/local/lib/dovecot/libdovecot.so.0(+0x9fe12) [0x7f2a05301e12] -> /usr/local/lib/dovecot/libdovecot.so.0(+0x9fefd) [0x7f2a05301efd] -> /usr/local/lib/dovecot/libdovecot.so.0(i_fatal+0) [0x7f2a052924d1] -> /usr/local/lib/dovecot/libdovecot-storage.so.0(+0x99704) [0x7f2a0562f704] -> /usr/local/lib/dovecot/libdovecot-storage.so.0(imapc_mailbox_set_corrupted+0xe3) [0x7f2a05628e63] -> /usr/local/lib/dovecot/libdovecot-storage.so.0(+0x97cf5) [0x7f2a0562dcf5] -> /usr/local/lib/dovecot/libdovecot-storage.so.0(+0x97d70) [0x7f2a0562dd70] -> /usr/local/lib/dovecot/libdovecot-storage.so.0(imapc_mailbox_sync_init+0x8bd) [0x7f2a0562e89d] -> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync_init+0x44) [0x7f2a055e1c14] -> /usr/local/lib/dovecot/libdovecot-storage.so.0(mailbox_sync+0x37) [0x7f2a055e1cb7] -> dovecot/imap(cmd_select_full+0x171) [0x413e51] -> dovecot/imap(command_exec+0x5c) [0x41b06c] -> dovecot/imap() [0x419662] -> dovecot/imap() [0x4196ec] -> dovecot/imap(client_handle_input+0x155) [0x419a85] -> dovecot/imap(client_input+0x82) [0x419ff2] -> /usr/local/lib/dovecot/libdovecot.so.0(io_loop_call_io+0x52) [0x7f2a053180d2] -> /usr/local/lib/dovecot/libdovecot.so.0(io_loop_handler_run_internal+0x109) [0x7f2a053197c9] -> /usr/local/lib/dovecot/libdovecot.so.0(io_loop_handler_run+0x3c) [0x7f2a0531816c] -> /usr/local/lib/dovecot/libdovecot.so.0(io_loop_run+0x38) [0x7f2a05318318] -> /usr/local/lib/dovecot/libdovecot.so.0(master_service_run+0x13) [0x7f2a0529cd93] -> dovecot/imap(main+0x302) [0x40cb92] -> /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7f2a04eb8830] -> dovecot/imap(_start+0x29) [0x40cd19]
Feb 15 15:43:14 imap(user1 at domain.com): Fatal: master: service(imap): child 9496 killed with signal 6 (core dumped)