This is a note to let you know that I've just added the patch titled
x86/cpu/vmware: Do not trace vmware_sched_clock()
to the 4.18-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-cpu-vmware-do-not-trace-vmware_sched_clock.patch
and it can be found in the queue-4.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 15035388439f892017d38b05214d3cda6578af64 Mon Sep 17 00:00:00 2001
From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>
Date: Fri, 9 Nov 2018 15:22:07 -0500
Subject: x86/cpu/vmware: Do not trace vmware_sched_clock()
From: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
commit 15035388439f892017d38b05214d3cda6578af64 upstream.
When running function tracing on a Linux guest running on VMware
Workstation, the guest would crash. This is due to tracing of the
sched_clock internal call of the VMware vmware_sched_clock(), which
causes an infinite recursion within the tracing code (clock calls must
not be traced).
Make vmware_sched_clock() not traced by ftrace.
Fixes: 80e9a4f21fd7c ("x86/vmware: Add paravirt sched clock")
Reported-by: GwanYeong Kim <gy741.kim@xxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
CC: Alok Kataria <akataria@xxxxxxxxxx>
CC: GwanYeong Kim <gy741.kim@xxxxxxxxx>
CC: "H. Peter Anvin" <hpa@xxxxxxxxx>
CC: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CC: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
CC: x86-ml <x86@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/20181109152207.4d3e7d70@xxxxxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/vmware.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/cpu/vmware.c
+++ b/arch/x86/kernel/cpu/vmware.c
@@ -77,7 +77,7 @@ static __init int setup_vmw_sched_clock(
}
early_param("no-vmw-sched-clock", setup_vmw_sched_clock);
-static unsigned long long vmware_sched_clock(void)
+static unsigned long long notrace vmware_sched_clock(void)
{
unsigned long long ns;
Patches currently in stable-queue which might be from rostedt@xxxxxxxxxxx are
queue-4.18/tracing-kprobes-check-the-probe-on-unloaded-module-correctly.patch
queue-4.18/x86-cpu-vmware-do-not-trace-vmware_sched_clock.patch
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