問題描述

現(xiàn)場(chǎng)NF5466M5主機(jī)，產(chǎn)線預(yù)裝操作系統(tǒng)RHEL6.7，軟件包使用全包安裝的方式，現(xiàn)場(chǎng)實(shí)施發(fā)現(xiàn)USB設(shè)備無法使用，并且有接入U(xiǎn)SB設(shè)備后宕機(jī)的情況。收集日志發(fā)現(xiàn)有如下報(bào)錯(cuò)。

Sep 22 11:02:48 localhost pulseaudio[7275]: pid.c: Stale PID file, overwriting.

Sep 22 11:05:39 localhost kernel: usb 1-2: new low speed USB device number 4 using xhci_hcd

Sep 22 11:05:39 localhost kernel: usb 1-2: device descriptor read/64, error -71

Sep 22 11:05:39 localhost kernel: xhci_hcd 0000:00:14.0: Setup ERROR: setup context command for slot 3.

Sep 22 11:05:39 localhost kernel: hub 1-0:1.0: unable to enumerate USB device on port 2

Sep 22 11:05:41 localhost kernel: dmar: DRHD: handling fault status reg 2

Sep 22 11:05:41 localhost kernel: dmar: DMAR:[DMA Read] Request device [00:14.0] fault addr 0

Sep 22 11:05:41 localhost kernel: DMAR:[fault reason 06] PTE Read access is not set

Sep 22 11:05:47 localhost kernel: xhci_hcd 0000:00:14.0: Timeout while waiting for a slot

Sep 22 11:05:56 localhost kernel: xhci_hcd 0000:00:14.0: Stopped the command ring failed, maybe the host is dead

Sep 22 11:05:56 localhost kernel: xhci_hcd 0000:00:14.0: Abort command ring failed

Sep 22 11:05:56 localhost kernel: xhci_hcd 0000:00:14.0: HC died; cleaning up

Sep 22 11:05:56 localhost kernel: hub 1-0:1.0: cannot reset port 2 (err = -19)

Sep 22 11:05:56 localhost kernel: hub 1-0:1.0: cannot disable port 2 (err = -19)

涉及范圍

M5/M4機(jī)型+搭配rhel6.x+全包安裝操作系統(tǒng)。grub.conf及menu.lst有iommu=on的字樣。

處理方案

重啟后在菜單選擇的時(shí)候按e修改參數(shù)，將intel_iommu=on amd_iommu=on中的on改成off，進(jìn)入系統(tǒng)之后再修改grub.conf文件，修改內(nèi)容與前面一致。

故障根因

sosreport中看到/proc/cmdline中有intel_iommu=on amd_iommu=on參數(shù)。

根據(jù)以往的經(jīng)驗(yàn)，在一些機(jī)器上使用intel_iommu時(shí)偶爾會(huì)在插拔USB設(shè)備時(shí)出現(xiàn)系統(tǒng)hang住的問題；

在低版本內(nèi)核中，還存在啟動(dòng)intel_iommu后kdump服務(wù)無法收集vmcore的問題，這些問題都和RHEL6版本的內(nèi)核中相關(guān)的實(shí)現(xiàn)有關(guān)。