[2.5.9] SIGABORT cyrus-httpd graceful shutdown

[MASHtm]

if cyrus-httpd holds a keepalive connection and cyrus-master signals a graceful shutdown it exits with a fatal SIGABORT. syslog shows:

Oct  6 23:29:36 hector Bhttps[16915]: Fatal error: Internal error: assertion failed: imap/dav_db.c: 99: !open_davdbs

a strace shows

pselect6(1, [0], NULL, NULL, {195, 555187651}, {[], 8}) = ? ERESTARTNOHAND (To be restarted if no handler)
--- SIGTERM {si_signo=SIGTERM, si_code=SI_USER, si_pid=18172, si_uid=76} ---
rt_sigreturn()                          = -1 EINTR (Interrupted system call)
getppid()                               = 18172
sendto(5, "<181>Oct  6 23:58:38 Bhttps[19026]: graceful shutdown\0", 54, MSG_NOSIGNAL, NULL, 0) = 54
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
write(15, ">1475791118>", 12)           = 12
write(15, "HTTP/1.1 500 Internal Server Error\r\nContent-Type: text/plain\r\nConnection: close\r\n\r\nFatal error: Internal error: assertion failed: imap/dav_db.c: 99: !open_davdbs\r\n", 163) = 163
write(1, "xxxxxx", 192) = 192
sendto(5, "<179>Oct  6 23:58:38 Bhttps[19026]: Fatal error: Internal error: assertion failed: imap/dav_db.c: 99: !open_davdbs\0", 115, MSG_NOSIGNAL, NULL, 0) = 115
open("/dev/tty", O_RDWR|O_NOCTTY|O_NONBLOCK) = -1 ENXIO (No such device or address)
writev(2, [{"*** glibc detected *** ", 23}, {"httpd: xxxxx [xxx.xxx.x.xxx] sackbauere77                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       "..., 2238}, {": ", 2}, {"free(): invalid pointer", 23}, {": 0x", 4}, {"00007f4da88381a8", 16}, {" ***\n", 5}], 7) = 2311
....

[elliefm]

I think this is already fixed in git: ab4f903