[PATCH] fix indefinite hang on no-mmu systems

Mike Frysinger vapier at gentoo.org
Thu Apr 5 05:52:25 UTC 2012

The ptrace setoptions code will fork a child which goes to sleep and
expects the parent to continue on to do tests.  Unfortunately, this
does not work on no-mmu systems as fork() is actually vfork() and any
vforked children will hang the parent until it exits or execs.

We might be able to make this test work on no-mmu systems with a bit
of work, but easier to just disable this for the release so it works

* strace.c (test_ptrace_setoptions_for_all): Return if strace_vforked.

Signed-off-by: Mike Frysinger <vapier at gentoo.org>
 strace.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/strace.c b/strace.c
index 3ad037d..1097b0c 100644
--- a/strace.c
+++ b/strace.c
@@ -1285,6 +1285,10 @@ test_ptrace_setoptions_for_all(void)
 	int pid;
 	int it_worked = 0;
+	/* this fork test doesn't work on no-mmu systems */
+	if (strace_vforked)
+		return;
 	pid = fork();
 	if (pid < 0)

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