Author: delphij
Date: Mon Jun  1 18:15:45 2015
New Revision: 283889
URL: https://svnweb.freebsd.org/changeset/base/283889

Log:
  Clear p_stops when doing PT_DETACH.
  
  Without this, if a process was being traced by truss(1), which
  uses different p_stops bits than gdb(1), the latter would
  misbehave because of the unexpected bits.
  
  Reported by:  jceel
  Submitted by: sef
  Sponsored by: iXsystems, Inc.
  MFC after:    2 weeks

Modified:
  head/sys/kern/sys_process.c

Modified: head/sys/kern/sys_process.c
==============================================================================
--- head/sys/kern/sys_process.c Mon Jun  1 18:15:44 2015        (r283888)
+++ head/sys/kern/sys_process.c Mon Jun  1 18:15:45 2015        (r283889)
@@ -963,6 +963,7 @@ kern_ptrace(struct thread *td, int req, 
                                CTR1(KTR_PTRACE, "PT_DETACH: pid %d", p->p_pid);
                        p->p_oppid = 0;
                        p->p_flag &= ~(P_TRACED | P_WAITED | P_FOLLOWFORK);
+                       p->p_stops = 0;
 
                        /* should we send SIGCHLD? */
                        /* childproc_continued(p); */
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