Ubuntu
linux-source-2.6.22 package

  1. Bug #161795
  2. Comment #1

Comment 1 for bug 161795

Revision history for this message
Scott James Remnant (Canonical) (canonical-scott) wrote :

This small program demonstrates the failure.

It spawns a child which issues PTRACE_TRACEME and then raises SIGSTOP (which will be trapped by the parent).

The parent waits for the child with WNOWAIT to get the details early, this will spin at 100% CPU.

Remove the "| WNOWAIT" (and the additional waitid call just below) and it will work as expected.