Re: [uml-devel] How to reliably kill all vmlinux processes for a single VM?

["Richard W.M. Jones" <rjones@redhat.com>]

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On Tue, Aug 13, 2013 at 01:04:01PM +0100, Richard W.M. Jones wrote:
> OK, I understand what's going wrong and how to reproduce the
> signal-to-parent problem.  It does look like a bug in vmlinux.
> 
> It happens if the init process (PID 1) inside the VM gets a segfault.

To add an additional data-point, applying the attached patch causes
the rogue SIGTERM-to-parent signal to disappear.  So at least we know
where it comes from!

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-p2v converts physical machines to virtual machines.  Boot with a
live CD or over the network (PXE) and turn machines into KVM guests.
http://libguestfs.org/virt-v2v

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>>From 73e2153039803d6f8cec7425ae501f857d9523a9 Mon Sep 17 00:00:00 2001
From: "Richard W.M. Jones" <rjones@redhat.com>
Date: Tue, 13 Aug 2013 13:24:32 +0100
Subject: [PATCH] COMMENT OUT KILL SIGTERM

---
 arch/um/os-Linux/util.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/um/os-Linux/util.c b/arch/um/os-Linux/util.c
index 492ef5e..a0f308e 100644
--- a/arch/um/os-Linux/util.c
+++ b/arch/um/os-Linux/util.c
@@ -108,7 +108,7 @@ void os_dump_core(void)
 	 */
 
 	signal(SIGTERM, SIG_IGN);
-	kill(0, SIGTERM);
+	//kill(0, SIGTERM);
 	/*
 	 * Most of the other processes associated with this UML are
 	 * likely sTopped, so give them a SIGCONT so they see the
-- 
1.8.3.1


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