Author: kib
Date: Thu Feb 4 10:49:34 2016
New Revision: 295249
URL: https://svnweb.freebsd.org/changeset/base/295249
Log:
Guard against runnable td2 exiting and than being reused for unrelated
process when the parent sleeps waiting for the debugger attach on
fork.
Diagnosed and reviewed by: mjg
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/kern/kern_fork.c
Modified: head/sys/kern/kern_fork.c
==============================================================================
--- head/sys/kern/kern_fork.c Thu Feb 4 09:39:08 2016 (r295248)
+++ head/sys/kern/kern_fork.c Thu Feb 4 10:49:34 2016 (r295249)
@@ -777,7 +777,7 @@ do_fork(struct thread *td, struct fork_r
/*
* Wait until debugger is attached to child.
*/
- while ((td2->td_dbgflags & TDB_STOPATFORK) != 0)
+ while (td2->td_proc == p2 && (td2->td_dbgflags & TDB_STOPATFORK) != 0)
cv_wait(&p2->p_dbgwait, &p2->p_mtx);
_PRELE(p2);
racct_proc_fork_done(p2);
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