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[Qemu-devel] [Bug 1061778] Re: signal mask not reset on exec

From: Launchpad Bug Tracker
Subject: [Qemu-devel] [Bug 1061778] Re: signal mask not reset on exec
Date: Wed, 08 Nov 2017 04:17:27 -0000

[Expired for QEMU because there has been no activity for 60 days.]

** Changed in: qemu
       Status: Incomplete => Expired

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  signal mask not reset on exec

Status in QEMU:

Bug description:
  Seen in qemu-1.0 under 12.04, but AFAICT from current git it hasn't

  ./main-loop.c:qemu_signal_init blocks SIGALRM so it can be handled via

  ./net/tap.c:launch_script does not reset the signal mask before the
  execv() call, and signal masks are inherited. So the script is run
  with SIGALRM blocked (as can be seen in /proc/$$/status, "SigBlk:
  0000000000002000"). One reasonable example of where this bites is an
  interface up script that calls ping with a timeout to give things a
  chance to settle down before continuing, but abort if this doesn't
  happen within a reasonable time). Since ping uses SIGALRM for the
  timeout, this now never terminates.

  qemu-0.14 didn't block SIGALRM, so such scripts worked fine there.

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