[Qemu-devel] [Bug 1429313] Re: qemu-user doesn't block target signals on entry to signal hanlder.

[Peter Maydell]

The patches to block signals on entry to the signal handler have now
been applied to master.


** Changed in: qemu
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1429313

Title:
  qemu-user doesn't block target signals on entry to signal hanlder.

Status in QEMU:
  Fix Committed

Bug description:
  Upon entry to a target signal handler the function
  process_pending_signals in linux-user/signal.c block the appropriate
  host signals, but signals already received and queued by Qemu are not
  blocked. If multiple signals arrive in quick succession this results
  incorrect recursion in the target signal handler.

  The attached test case my be run as:

  $ (sleep 2 ; echo) | qemu-i386 ./a.out
  .................. Recursion in signal handler!
  qemu: uncaught target signal 6 (Aborted) - core dumped

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