IMAP crash in IMAPInboundProtocol::~IMAPInboundProtocol ()

[nielx]

During a normal run the mail_deamon crashes with the message 'called debugger(): looper must be locked before proceeding' with the following stack trace:

#0  0xffff0114 in ?? ()
#1  0x0024819e in debugger () from /boot/system/lib/libroot.so
#2  0x00401cb3 in BLooper::AssertLocked () from /boot/system/lib/libbe.so
#3  0x004002b4 in BLooper::RemoveHandler () from /boot/system/lib/libbe.so
#4  0x00606ed0 in MailProtocol::RemoveHandler ()
   from /boot/system/lib/libmail.so
#5  0x01c7feae in IMAPInboundProtocol::~IMAPInboundProtocol ()
   from /boot/system/add-ons/mail_daemon/inbound_protocols/IMAP
#6  0x01c81a58 in IMAPRootInboundProtocol::_ShutdownChilds ()
   from /boot/system/add-ons/mail_daemon/inbound_protocols/IMAP
#7  0x01c816b8 in IMAPRootInboundProtocol::Disconnect ()
   from /boot/system/add-ons/mail_daemon/inbound_protocols/IMAP
#8  0x01c7f698 in IMAPMailboxThread::_Watch ()
   from /boot/system/add-ons/mail_daemon/inbound_protocols/IMAP
#9  0x01c7f2db in watch_mailbox ()
   from /boot/system/add-ons/mail_daemon/inbound_protocols/IMAP
#10 0x0024c806 in thread_entry () from /boot/system/lib/libroot.so
#11 0x701c5fec in ?? ()

The issue does not occur with every run, so it might be a race condition somewhere. There were no signals that there was anything abnormal about this run. Tested with hrev41550.

[czeidler]

Should be fixed in hrev41821. The looper destructor has to clean up first...