[Bug 674704] Re: "restart udev" hangs

[Anatol Pomozov]

Ubuntu 10.04.

I am trying to implement my own upstart script and "start mydaemon" also
hangs on this point.


getuid()                                = 0
socket(PF_FILE, SOCK_STREAM, 0)         = 3
connect(3, {sa_family=AF_FILE, path=@"/com/ubuntu/upstart"}, 22) = 0
fcntl(3, F_GETFL)                       = 0x2 (flags O_RDWR)
fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK)    = 0
fcntl(3, F_GETFD)                       = 0
fcntl(3, F_SETFD, FD_CLOEXEC)           = 0
geteuid()                               = 0
rt_sigaction(SIGPIPE, {SIG_IGN, [PIPE], SA_RESTORER|SA_RESTART, 0x7f5200d05af0}, {SIG_DFL, [], 0}, 8) = 0
poll([{fd=3, events=POLLOUT}], 1, 0)    = 1 ([{fd=3, revents=POLLOUT}])
write(3, "\0", 1)                       = 1
write(3, "AUTH EXTERNAL 30\r\n", 18)    = 18
poll([{fd=3, events=POLLIN}], 1, -1)    = 1 ([{fd=3, revents=POLLIN}])
read(3, "OK 695795fefc908e7694d65a6d4f623"..., 2048) = 37
poll([{fd=3, events=POLLOUT}], 1, -1)   = 1 ([{fd=3, revents=POLLOUT}])
write(3, "BEGIN\r\n", 7)                = 7
poll([{fd=3, events=POLLIN|POLLOUT}], 1, -1) = 1 ([{fd=3, revents=POLLOUT}])
writev(3, [{"l\1\2\1\17\0\0\0\1\0\0\0_\0\0\0\1\1o\0\23\0\0\0/com/ubu"..., 112}, {"\n\0\0\0checkpatch\0", 15}], 2) = 127
poll([{fd=3, events=POLLIN}], 1, 25000) = 1 ([{fd=3, revents=POLLIN}])
read(3, "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) = 72
read(3, 0x7f520329fbe0, 2048)           = -1 EAGAIN (Resource temporarily unavailable)
writev(3, [{"l\1\2\1\10\0\0\0\2\0\0\0q\0\0\0\1\1o\0#\0\0\0/com/ubu"..., 136}, {"\0\0\0\0\1\0\0\0", 8}], 2) = 144
poll([{fd=3, events=POLLIN}], 1, -1


I do not understand why it hangs. Where I can find the upstart logs? How
to debug this problem? Is there any workaround for the issue?

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https://bugs.launchpad.net/bugs/674704

Title:
  "restart udev" hangs

Status in “udev” package in Ubuntu:
  New

Bug description:
  Binary package hint: udev

  On two headless servers "restart udev" just hangs.  When the udev
  package gets updated the only way to get aptitude to complete the
  upgrade is to kill the 'restart udev' process from the outside.

  The last thing 'strace restart udev' shows is:
  ocket(PF_FILE, SOCK_STREAM|SOCK_CLOEXEC, 0) = 3
  connect(3, {sa_family=AF_FILE, path=@"/com/ubuntu/upstart"}, 22) = 0
  fcntl(3, F_GETFL)                       = 0x2 (flags O_RDWR)
  fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK)    = 0
  geteuid()                               = 0
  getsockname(3, {sa_family=AF_FILE, NULL}, [2]) = 0
  poll([{fd=3, events=POLLOUT}], 1, 0)    = 1 ([{fd=3, revents=POLLOUT}])
  write(3, "\0", 1)                       = 1
  sendto(3, "AUTH EXTERNAL 30\r\n", 18, MSG_NOSIGNAL, NULL, 0) = 18
  poll([{fd=3, events=POLLIN}], 1, -1)    = 1 ([{fd=3, revents=POLLIN}])
  read(3, "OK d71fcfbb5e2671f0f0575cf800000"..., 2048) = 37
  poll([{fd=3, events=POLLOUT}], 1, -1)   = 1 ([{fd=3, revents=POLLOUT}])
  sendto(3, "NEGOTIATE_UNIX_FD\r\n", 19, MSG_NOSIGNAL, NULL, 0) = 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}])
  sendto(3, "BEGIN\r\n", 7, MSG_NOSIGNAL, NULL, 0) = 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\t\0\0\0\1\0\0\0_\0\0\0\1\1o\0\23\0\0\0/com/ubu"..., 112}, {"\4\0\0\0udev\0", 9}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 121
  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) = 66
  recvmsg(3, 0x7fffee846a60, 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\2\0\0\0i\0\0\0\1\1o\0\35\0\0\0/com/ubu"..., 128}, {"\0\0\0\0\1\0\0\0", 8}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 136
  poll([{fd=3, events=POLLIN}], 1, -1

  
  I can only reproduce the problem on servers (with sshd, apache2, mysql, ... no dbus).  On desktop installations the restart command works fine.
  I first saw the problem on lucid but it still occurs on maverick.

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