[Dovecot] Crash in rc15

We just experienced another crash in rc15. Here is the full backtrace:

(gdb) bt full #0 0xff1c12a4 in .L423 () from /lib/libc.so.1 No symbol table info available. #1 0xff15fe20 in __wcsxfrm_std () from /lib/libc.so.1 No symbol table info available. #2 0xff140040 in getutline () from /lib/libc.so.1 No symbol table info available. #3 0x000786a8 in i_internal_panic_handler ( fmt=0x9ae80 "file %s: line %d (%s): assertion failed: (%s)", args=0xffbff598) at failures.c:382 No locals. #4 0x00078190 in i_panic ( format=0x9ae80 "file %s: line %d (%s): assertion failed: (%s)") at failures.c:180 No locals. #5 0x000867d4 in p_strdup_until (pool=0xac54c, start=0xb8128, end=0x0) at strfuncs.c:151 size = 4294213336 mem = 0xac54c "" __PRETTY_FUNCTION__ = "p_strdup_until" #6 0x00035280 in mbox_get_index_dir (storage=0xb7c08, name=0xb8128 "~-~-~") at mbox-storage.c:448 p = 0x0 #7 0x00035cac in mbox_mailbox_delete (_storage=0xb7c08, name=0xb8128 "~-~-~") at mbox-storage.c:901 index_dir = 0xb812d "" path = 0xb8128 "~-~-~" st = {st_dev = 22282293, st_pad1 = {0, 0, 0}, st_ino = 1049, st_mode = 33152, st_nlink = 1, st_uid = 101321, st_gid = 1000, st_rdev = 0, st_pad2 = {0, 0}, st_size = 0, st_atim = {tv_sec = 1168024501, tv_nsec = 972872000}, st_mtim = {tv_sec = 1168024501, tv_nsec = 972872000}, st_ctim = {tv_sec = 1168024501, tv_nsec = 972872000}, st_blksize = 8192, st_blocks = 0, st_fstype = "ufs", '\0' , st_pad4 = {0, 0, 0, 0, 0, 0, 0, 0}} #8 0x00069d3c in mail_storage_mailbox_delete (storage=0xb7c08, name=0xb8128 "~-~-~") at mail-storage.c:295 No locals. #9 0x0001e8a4 in cmd_delete (cmd=0xb7e14) at cmd-delete.c:44 client = (struct client *) 0xb812d storage = (struct mail_storage *) 0xb7c08 mailbox = (struct mailbox *) 0xbf1a8 name = 0xb8128 "~-~-~" #10 0x0002287c in _client_input (context=0xb7dd0) at client.c:381 cmd = (struct client_command_context *) 0xb7e14 ret = 124928 #11 0x0007e3bc in io_loop_handler_run (ioloop=0xb56c8) at ioloop-poll.c:199 ctx = (struct ioloop_handler_context *) 0xb5700 pollfd = (struct pollfd *) 0x2 tv = {tv_sec = 9, tv_usec = 990017} io = (struct io *) 0xb6658 t_id = 2 msecs = 9990 ret = 0 call = true #12 0x0007dc9c in io_loop_run (ioloop=0xb56c8) at ioloop.c:281 No locals. #13 0x0002ab24 in main (argc=-4195379, argv=0xab800, envp=0xac400) at main.c:280 No locals. (gdb) quit

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