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 4.19-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-4.19 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-4.19/tracing-kprobes-check-the-probe-on-unloaded-module-correctly.patch queue-4.19/x86-cpu-vmware-do-not-trace-vmware_sched_clock.patch