From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from out02.mta.xmission.com ([166.70.13.232]) by canuck.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1RINz8-0004qU-Rv for kexec@lists.infradead.org; Mon, 24 Oct 2011 17:06:51 +0000 From: ebiederm@xmission.com (Eric W. Biederman) References: <1319468137.3615.16.camel@br98xy6r> Date: Mon, 24 Oct 2011 10:07:19 -0700 In-Reply-To: (=?utf-8?Q?=22Am=C3=A9rico?= Wang"'s message of "Mon, 24 Oct 2011 23:23:33 +0800") Message-ID: MIME-Version: 1.0 Subject: Re: kdump: crash_kexec()-smp_send_stop() race in panic List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=twosheds.infradead.org@lists.infradead.org To: =?utf-8?Q?Am=C3=A9rico?= Wang Cc: heiko.carstens@de.ibm.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, schwidefsky@de.ibm.com, akpm@linux-foundation.org, holzheu@linux.vnet.ibm.com, Vivek Goyal QW3DqXJpY28gV2FuZyA8eGl5b3Uud2FuZ2NvbmdAZ21haWwuY29tPiB3cml0ZXM6Cgo+IE9uIE1v biwgT2N0IDI0LCAyMDExIGF0IDExOjE0IFBNLCBFcmljIFcuIEJpZWRlcm1hbgo+IDxlYmllZGVy bUB4bWlzc2lvbi5jb20+IHdyb3RlOgo+PiBNaWNoYWVsIEhvbHpoZXUgPGhvbHpoZXVAbGludXgu dm5ldC5pYm0uY29tPiB3cml0ZXM6Cj4+Cj4+PiBIZWxsbyBWaXZlaywKPj4+Cj4+PiBJbiBvdXIg dGVzdHMgd2UgcmFuIGludG8gdGhlIGZvbGxvd2luZyBzY2VuYXJpbzoKPj4+Cj4+PiBUd28gQ1BV cyBoYXZlIGNhbGxlZCBwYW5pYyBhdCB0aGUgc2FtZSB0aW1lLiBUaGUgZmlyc3QgQ1BVIGNhbGxl ZAo+Pj4gY3Jhc2hfa2V4ZWMoKSBhbmQgdGhlIHNlY29uZCBDUFUgY2FsbGVkIHNtcF9zZW5kX3N0 b3AoKSBpbiBwYW5pYygpCj4+PiBiZWZvcmUgY3Jhc2hfa2V4ZWMoKSBmaW5pc2hlZCBvbiB0aGUg Zmlyc3QgQ1BVLiBTbyB0aGUgc2Vjb25kIENQVQo+Pj4gc3RvcHBlZCB0aGUgZmlyc3QgQ1BVIGFu ZCB0aGVyZWZvcmUga2R1bXAgZmFpbGVkLgo+Pj4KPj4+IDFzdCBDUFU6Cj4+PiBwYW5pYygpLT5j cmFzaF9rZXhlYygpLT5tdXRleF90cnlsb2NrKCZrZXhlY19tdXRleCktPiBkbyBrZHVtcAo+Pj4K Pj4+IDJuZCBDUFU6Cj4+PiBwYW5pYygpLT5jcmFzaF9rZXhlYygpLT5rZXhlY19tdXRleCBhbHJl YWR5IGhlbGQgYnkgMXN0IENQVQo+Pj4gwqAgwqAgwqAgwqAtPnNtcF9zZW5kX3N0b3AoKS0+IHN0 b3AgQ1BVIDEgKHN0b3Aga2R1bXApCj4+Pgo+Pj4gSG93IHNob3VsZCB3ZSBmaXggdGhpcyBwcm9i bGVtPyBPbmUgcG9zc2liaWxpdHkgY291bGQgYmUgdG8gZG8KPj4+IHNtcF9zZW5kX3N0b3AoKSBi ZWZvcmUgd2UgY2FsbCBjcmFzaF9rZXhlYygpLgo+Pj4KPj4+IFdoYXQgZG8geW91IHRoaW5rPwo+ Pgo+PiBzbXBfc2VuZF9zdG9wIGlzIGluc3VmZmljaWVudGx5IHJlbGlhYmxlIHRvIGJlIHVzZWQg YmVmb3JlIGNyYXNoX2tleGVjLgo+Pgo+PiBNeSBmaXJzdCByZWFjdGlvbiB3b3VsZCBiZSB0byB0 ZXN0IG9vcHNfaW5fcHJvZ3Jlc3MgYW5kIHdhaXQgdW50aWwKPj4gb29wc19pbl9wcm9ncmVzcyA9 PSAxIGJlZm9yZSBjYWxsaW5nIHNtcF9zZW5kX3N0b3AuCj4+Cj4KPiArMQo+Cj4gT25lIG9mIG15 IGNvbGxlYWd1ZSBtZW50aW9uZWQgdGhlIHNhbWUgcHJvYmxlbSB3aXRoIG1lIGluc2lkZQo+IFJI LCBnaXZlbiB0aGUgZmFjdCB0aGF0IHRoZSByYWNlIGNvbmRpdGlvbiB3aW5kb3cgaXMgc21hbGws IGl0IHdvdWxkCj4gbm90IGJlIGVhc3kgdG8gcmVwcm9kdWNlIHRoaXMgc2NlbmFyaW8uCgpBcyBm b3IgcmVwcm9kdWNpbmcgaXQgSSBoYXZlIGEgaHVuY2ggeW91IGNvdWxkIGhhY2sgdXAgc29tZXRo aW5nCmhvcnJpYmxlIHdpdGggc21wX2NhbGxfZnVuY3Rpb24gYW5kIGtwcm9iZXMuCgoKT24gYSBs aXR0bGUgbW9yZSByZWZsZWN0aW9uIHdlIGNhbid0IHdhaXQgdW50aWwgb29wc19pbl9wcm9ncmVz cyBnb2VzCnRvIDEgYmVmb3JlIGNhbGxpbmcgc21wX3NlbmRfc3RvcC4gIEJlY2F1c2UgaWYgY3Jh c2hfa2V4ZWMgaXMgbm90Cmludm9sdmVkIG5vdGhpbmcgd2Ugd2lsbCBuZXZlciBjYWxsIHNtcF9z ZW5kX3N0b3AuIAoKU28gbXkgc2Vjb25kIHRob3VnaHQgaXMgdG8gaW50cm9kdWNlIGFub3RoZXIg YXRvbWljIHZhcmlhYmxlCnBhbmljX2luX3Byb2dyZXNzLCB2aXNpYmxlIG9ubHkgaW4gcGFuaWMu ICBUaGUgY3B1IHRoYXQgc2V0cwppbmNyZW1lbnRzIHBhbmljX2luX3Byb2dyZXNzIGNhbiBjYWxs IHNtcF9zZW5kX3N0b3AuICBUaGUgcmVzdCBvZgp0aGUgY3B1cyBjYW4ganVzdCBnbyBpbnRvIGEg YnVzeSB3YWl0LiAgVGhhdCBzaG91bGQgc3RvcCBuYXN0eQpmaWdodHMgYWJvdXQgd2hvIGlzIGdv aW5nIHRvIGNvbWUgb3V0IG9mIHNtcF9zZW5kX3N0b3AgZmlyc3QuCgpFcmljCgpfX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwprZXhlYyBtYWlsaW5nIGxpc3QK a2V4ZWNAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9yZy9tYWls bWFuL2xpc3RpbmZvL2tleGVjCg==