This issue also seems to be the cause of difficulties with minidlna if
the -R flag is added to rescan the media files directory because
minidlnad creates an additional process to do the rescanning. So if
expect daemon is used for the two process at startup, then the shutdown
runs into difficulties because there is only one process to be killed,
the rescan process having ended by itself.
So until a fix is found for upstart, users should be advised not to add
-R for rescan to the upstart configuration file, and that if they need
to do a rescan at startup, use the traditional sysV rc init.d script
and not upstart to start and stop the daemon.
It would also be very useful if there was some initctl command to wipe that
state of service jobs which are in a bad state eg
minidlna stop/killed, process 5114 or minidlna start/killed, process 5114
since once the upstart job gets into this state, using start or stop results in
upstart hanging on
connect(3, {sa_family=AF_FILE, path=@"/com/ubuntu/upstart"}, 22) = 0
fcntl64(3, F_GETFL) = 0x2 (flags O_RDWR)
fcntl64(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
geteuid32() = 0
getsockname(3, {sa_family=AF_FILE, NULL}, [2]) = 0
poll([{fd=3, events=POLLOUT}], 1, 0) = 1 ([{fd=3, revents=POLLOUT}])
send(3, "\0", 1, MSG_NOSIGNAL) = 1
send(3, "AUTH EXTERNAL 30\r\n", 18, MSG_NOSIGNAL) = 18
poll([{fd=3, events=POLLIN}], 1, -1) = 1 ([{fd=3, revents=POLLIN}])
read(3, "OK 37d274edad794a392790c969525d3"..., 2048) = 37
poll([{fd=3, events=POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
send(3, "NEGOTIATE_UNIX_FD\r\n", 19, MSG_NOSIGNAL) = 19
poll([{fd=3, events=POLLIN}], 1, -1) = 1 ([{fd=3, revents=POLLIN}])
read(3, "AGREE_UNIX_FD\r\n", 2048) = 15
poll([{fd=3, events=POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
send(3, "BEGIN\r\n", 7, MSG_NOSIGNAL) = 7
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
sendmsg(3, {msg_name(0)=NULL,
msg_iov(2)=[{"l\1\2\1\r\0\0\0\1\0\0\0_\0\0\0\1\1o\0\23\0\0\0/com/ubu"..., 112},
{"\10\0\0\0minidlna\0", 13}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) =
125
clock_gettime(CLOCK_MONOTONIC, {13369, 479497006}) = 0
poll([{fd=3, events=POLLIN}], 1, 25000) = 1 ([{fd=3, revents=POLLIN}])
recvmsg(3, {msg_name(0)=NULL,
msg_iov(1)=[{"l\2\1\1&\0\0\0\1\0\0\0\17\0\0\0\5\1u\0\1\0\0\0\10\1g\0\1o\0\0"...,
2048}], msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 70
recvmsg(3, 0xbfd42610, MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily
unavailable)
sendmsg(3, {msg_name(0)=NULL,
msg_iov(2)=[{"l\1\2\1\4\0\0\0\2\0\0\0x\0\0\0\1\1o\0!\0\0\0/com/ubu"..., 136},
{"\0\0\0\0", 4}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 140
clock_gettime(CLOCK_MONOTONIC, {13369, 504154425}) = 0
poll([{fd=3, events=POLLIN}], 1, 25000) = 1 ([{fd=3, revents=POLLIN}])
recvmsg(3, {msg_name(0)=NULL,
msg_iov(1)=[{"l\2\1\1(\0\0\0\2\0\0\0\17\0\0\0\5\1u\0\2\0\0\0\10\1g\0\1o\0\0"...,
2048}], msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 72
recvmsg(3, 0xbfd425d0, MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily
unavailable)
sendmsg(3, {msg_name(0)=NULL,
msg_iov(2)=[{"l\1\2\1\10\0\0\0\3\0\0\0q\0\0\0\1\1o\0!\0\0\0/com/ubu"..., 136},
{"\0\0\0\0\1\0\0\0", 8}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 144
clock_gettime(CLOCK_MONOTONIC, {13369, 509531849}) = 0
poll([{fd=3, events=POLLIN}], 1, -1) = 1 ([{fd=3, revents=POLLIN}])
recvmsg(3, {msg_name(0)=NULL,
msg_iov(1)=[{"l\4\1\1\t\0\0\0\3\0\0\0w\0\0\0\1\1o\0#\0\0\0/com/ubu"..., 2048}],
msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 145
recvmsg(3, 0xbfd42700, MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily
unavailable)
clock_gettime(CLOCK_MONOTONIC, {13369, 516260329}) = 0
poll([{fd=3, events=POLLIN}], 1, -7) = ? ERESTART_RESTARTBLOCK (To be
restarted)
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https://bugs.launchpad.net/bugs/406397
Title:
init: job stuck with expect fork/daemon when parent reaps child
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