From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753463AbbAUTCZ (ORCPT ); Wed, 21 Jan 2015 14:02:25 -0500 Received: from mx1.redhat.com ([209.132.183.28]:33135 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752144AbbAUTCS (ORCPT ); Wed, 21 Jan 2015 14:02:18 -0500 From: Vitaly Kuznetsov To: "K. Y. Srinivasan" , devel@linuxdriverproject.org Cc: Haiyang Zhang , linux-kernel@vger.kernel.org, Dexuan Cui Subject: [PATCH 0/3] Drivers: hv: vmbus: fix crashes on hv_vmbus load/unload path Date: Wed, 21 Jan 2015 20:02:06 +0100 Message-Id: <1421866929-20167-1-git-send-email-vkuznets@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It is possible (since 93e5bd06a953: "Drivers: hv: Make the vmbus driver unloadable") to unload hv_vmbus driver if no other devices are connected. 1aec169673d7: "x86: Hyperv: Cleanup the irq mess" fixed doulble interrupt gate setup. However, if we try to unload hv_vmbus and then load it back crashes in different places of vmbus driver occur on both unload and second load paths. Address those I saw in my testing. Not everything is fixed though. MCE was hit once on Generation2 instance and I neither understand what caused it nor do I know the way to reproduce it. Anyway, here is the log: [ 204.846255] mce: [Hardware Error]: CPU 0: Machine Check Exception: 4 Bank 0: b2000000c0020001 [ 204.846675] mce: [Hardware Error]: TSC 6b5cd64bc8 [ 204.846675] mce: [Hardware Error]: PROCESSOR 0:306e4 TIME 1421944123 SOCKET 0 APIC 0 microcode ffffffff [ 204.846675] mce: [Hardware Error]: Run the above through 'mcelog --ascii' [ 204.846675] mce: [Hardware Error]: Machine check: Processor context corrupt [ 204.846675] Kernel panic - not syncing: Fatal Machine check [ 204.846675] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff) [ 204.846675] Rebooting in 30 seconds.. [ 204.846675] ACPI MEMORY or I/O RESET_REG. Vitaly Kuznetsov (3): Drivers: hv: vmbus: avoid double kfree for device_obj Drivers: hv: vmbus: introduce vmbus_acpi_remove Drivers: hv: vmbus: teardown hv_vmbus_con workqueue and vmbus_connection pages on shutdown drivers/hv/channel_mgmt.c | 1 - drivers/hv/connection.c | 17 ++++++++++++----- drivers/hv/hyperv_vmbus.h | 1 + drivers/hv/vmbus_drv.c | 16 ++++++++++++++++ 4 files changed, 29 insertions(+), 6 deletions(-) -- 1.9.3