From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from out5-smtp.messagingengine.com ([66.111.4.29]:49129 "EHLO out5-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752562AbcGXWxB (ORCPT ); Sun, 24 Jul 2016 18:53:01 -0400 Subject: FAILED: patch "[PATCH] KVM: arm/arm64: Stop leaking vcpu pid references" failed to apply to 3.14-stable tree To: james.morse@arm.com, christoffer.dall@linaro.org, marc.zyngier@arm.com, stable@vger.kernel.org Cc: From: Date: Sun, 24 Jul 2016 15:53:15 -0700 Message-ID: <14694007951336@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: The patch below does not apply to the 3.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >>From 591d215afcc2f94e8e2c69a63c924c044677eb31 Mon Sep 17 00:00:00 2001 From: James Morse Date: Wed, 8 Jun 2016 17:24:45 +0100 Subject: [PATCH] KVM: arm/arm64: Stop leaking vcpu pid references kvm provides kvm_vcpu_uninit(), which amongst other things, releases the last reference to the struct pid of the task that was last running the vcpu. On arm64 built with CONFIG_DEBUG_KMEMLEAK, starting a guest with kvmtool, then killing it with SIGKILL results (after some considerable time) in: > cat /sys/kernel/debug/kmemleak > unreferenced object 0xffff80007d5ea080 (size 128): > comm "lkvm", pid 2025, jiffies 4294942645 (age 1107.776s) > hex dump (first 32 bytes): > 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > backtrace: > [] create_object+0xfc/0x278 > [] kmemleak_alloc+0x34/0x70 > [] kmem_cache_alloc+0x16c/0x1d8 > [] alloc_pid+0x34/0x4d0 > [] copy_process.isra.6+0x79c/0x1338 > [] _do_fork+0x74/0x320 > [] SyS_clone+0x18/0x20 > [] el0_svc_naked+0x24/0x28 > [] 0xffffffffffffffff On x86 kvm_vcpu_uninit() is called on the path from kvm_arch_destroy_vm(), on arm no equivalent call is made. Add the call to kvm_arch_vcpu_free(). Signed-off-by: James Morse Fixes: 749cf76c5a36 ("KVM: ARM: Initial skeleton to compile KVM support") Cc: # 3.10+ Acked-by: Marc Zyngier Signed-off-by: Christoffer Dall diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c index 893941ec98dc..f1bde7c4e736 100644 --- a/arch/arm/kvm/arm.c +++ b/arch/arm/kvm/arm.c @@ -263,6 +263,7 @@ void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu) kvm_timer_vcpu_terminate(vcpu); kvm_vgic_vcpu_destroy(vcpu); kvm_pmu_vcpu_destroy(vcpu); + kvm_vcpu_uninit(vcpu); kmem_cache_free(kvm_vcpu_cache, vcpu); }