[Bug 1083407] [NEW] subtle upstart race condition with rc-sysinit scripts

[ghomem]

Public bug reported:

In fast machines one can see a race condition related to the old-style
sysinit scripts that upstart runs. I noticed this on a virtual machine.

The symptoms are:

- winbind is hung on a futex  call (only one winbind proc is visible, unlike the usual situation)
- xrdp is not launched because start-stop-daemon is also hanging on a futex call
- ...

Perhaps these daemons are being launched before networking or DNS.

Process 916 attached - interrupt to quit
futex(0xb666cd08, FUTEX_WAIT_PRIVATE, 2, NUL

However if we insert an S10sleep script on rc2.d, with

sleep 5

the problem disappears. That is, winbind and xrdp start up normally.

Notes:

I have the latest upstart package installed.
The problem is reproducible

** Affects: samba (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1083407

Title:
  subtle upstart race condition with rc-sysinit scripts

Status in “samba” package in Ubuntu:
  New

Bug description:
  In fast machines one can see a race condition related to the old-style
  sysinit scripts that upstart runs. I noticed this on a virtual
  machine.

  The symptoms are:

  - winbind is hung on a futex  call (only one winbind proc is visible, unlike the usual situation)
  - xrdp is not launched because start-stop-daemon is also hanging on a futex call
  - ...

  Perhaps these daemons are being launched before networking or DNS.

  Process 916 attached - interrupt to quit
  futex(0xb666cd08, FUTEX_WAIT_PRIVATE, 2, NUL

  However if we insert an S10sleep script on rc2.d, with

  sleep 5

  the problem disappears. That is, winbind and xrdp start up normally.

  Notes:

  I have the latest upstart package installed.
  The problem is reproducible

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