From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bart Van Assche Subject: Re: [PATCH] blk-mq: Fix several SCSI request queue lockups Date: Mon, 4 Dec 2017 22:48:18 +0000 Message-ID: <1512427697.2795.14.camel@wdc.com> References: <20171204173032.16330-1-bart.vanassche@wdc.com> <20171204224200.GA6888@ming.t460p> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from esa4.hgst.iphmx.com ([216.71.154.42]:59995 "EHLO esa4.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750995AbdLDWsV (ORCPT ); Mon, 4 Dec 2017 17:48:21 -0500 In-Reply-To: <20171204224200.GA6888@ming.t460p> Content-Language: en-US Content-ID: Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: "ming.lei@redhat.com" Cc: "jthumshirn@suse.de" , "linux-block@vger.kernel.org" , "hch@lst.de" , "martin.petersen@oracle.com" , "axboe@kernel.dk" , "linux-scsi@vger.kernel.org" , "hare@suse.com" , "jejb@linux.vnet.ibm.com" T24gVHVlLCAyMDE3LTEyLTA1IGF0IDA2OjQyICswODAwLCBNaW5nIExlaSB3cm90ZToNCj4gT24g TW9uLCBEZWMgMDQsIDIwMTcgYXQgMDk6MzA6MzJBTSAtMDgwMCwgQmFydCBWYW4gQXNzY2hlIHdy b3RlOg0KPiA+ICogQSBzeXN0ZW1hdGljIGxvY2t1cCBmb3IgU0NTSSBxdWV1ZXMgd2l0aCBxdWV1 ZSBkZXB0aCAxLiBUaGUNCj4gPiAgIGZvbGxvd2luZyB0ZXN0IHJlcHJvZHVjZXMgdGhhdCBidWcg c3lzdGVtYXRpY2FsbHk6DQo+ID4gICAtIENoYW5nZSB0aGUgU1JQIGluaXRpYXRvciBzdWNoIHRo YXQgU0NTSSB0YXJnZXQgcXVldWUgZGVwdGggaXMNCj4gPiAgICAgbGltaXRlZCB0byAxLg0KPiA+ ICAgLSBSdW4gdGhlIGZvbGxvd2luZyBjb21tYW5kOg0KPiA+ICAgICAgIHNycC10ZXN0L3J1bl90 ZXN0cyAtZiB4ZnMgLWQgLWUgbm9uZSAtciA2MCAtdCAwMQ0KPiA+ICAgU2VlIGFsc28gIltQQVRD SCA0LzddIGJsay1tcTogQXZvaWQgdGhhdCByZXF1ZXN0IHByb2Nlc3NpbmcNCj4gPiAgIHN0YWxs cyB3aGVuIHNoYXJpbmcgdGFncyINCj4gPiAgIChodHRwczovL21hcmMuaW5mby8/bD1saW51eC1i bG9jayZtPTE1MTIwODY5NTMxNjg1NykuIE5vdGU6DQo+ID4gICByZXZlcnRpbmcgY29tbWl0IDBk ZjIxYzg2YmRiZiBhbHNvIGZpeGVzIGEgc3BvcmFkaWMgU0NTSSByZXF1ZXN0DQo+ID4gICBxdWV1 ZSBsb2NrdXAgd2hpbGUgaW5zZXJ0aW5nIGEgYmxrX21xX3NjaGVkX21hcmtfcmVzdGFydF9oY3R4 KCkNCj4gPiAgIGJlZm9yZSBhbGwgYmxrX21xX2Rpc3BhdGNoX3JxX2xpc3QoKSBjYWxscyBvbmx5 IGZpeGVzIHRoZQ0KPiA+ICAgc3lzdGVtYXRpYyBsb2NrdXAgZm9yIHF1ZXVlIGRlcHRoIDEuDQo+ IA0KPiBZb3UgYXJlIHRoZSBvbmx5IHJlcHJvZHVjZXIgWyAuLi4gXQ0KDQpUaGF0J3Mgbm90IGNv cnJlY3QuIEknbSBwcmV0dHkgc3VyZSBpZiB5b3UgdHJ5IHRvIHJlcHJvZHVjZSB0aGlzIHRoYXQN CnlvdSB3aWxsIHNlZSB0aGUgc2FtZSBoYW5nIEkgcmFuIGludG8uIERvZXMgdGhpcyBtZWFuIHRo YXQgeW91IGhhdmUgbm90DQp5ZXQgdHJpZWQgdG8gcmVwcm9kdWNlIHRoZSBoYW5nIEkgcmVwb3J0 ZWQ/DQoNCj4gWW91IHNhaWQgdGhhdCB5b3VyIHBhdGNoIGZpeGVzICdjb21taXQgYjM0NzY4OWZm YmNhICgiYmxrLW1xLXNjaGVkOg0KPiBpbXByb3ZlIGRpc3BhdGNoaW5nIGZyb20gc3cgcXVldWUi KScsIGJ1dCB5b3UgZG9uJ3QgbWVudGlvbiBhbnkgaXNzdWUNCj4gYWJvdXQgdGhhdCBjb21taXQu DQoNClRoYXQncyBub3QgY29ycmVjdCBlaXRoZXIuIEZyb20gdGhlIGNvbW1pdCBtZXNzYWdlICJB IHN5c3RlbWF0aWMgbG9ja3VwDQpmb3IgU0NTSSBxdWV1ZXMgd2l0aCBxdWV1ZSBkZXB0aCAxLiIN Cg0KPiA+IEkgdGhpbmsgdGhlIGFib3ZlIG1lYW5zIHRoYXQgaXQgaXMgdG9vIHJpc2t5IHRvIHRy eSB0byBmaXggYWxsIGJ1Z3MNCj4gPiBpbnRyb2R1Y2VkIGJ5IGNvbW1pdCAwZGYyMWM4NmJkYmYg YmVmb3JlIGtlcm5lbCB2NC4xNSBpcyByZWxlYXNlZC4NCj4gPiBIZW5jZSByZXZlcnQgdGhhdCBj b21taXQuDQo+IA0KPiBXaGF0IGlzIHRoZSByaXNrPw0KDQpUaGF0IG1vcmUgYnVncyB3ZXJlIGlu dHJvZHVjZWQgYnkgY29tbWl0IDBkZjIxYzg2YmRiZiB0aGFuIHRoZSBvbmVzIHRoYXQNCmhhdmUg YmVlbiBkaXNjb3ZlcmVkIHNvIGZhci4NCg0KQmFydC4=