From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Bart Van Assche To: "joseph.qi@linux.alibaba.com" , "axboe@kernel.dk" CC: "gavin.dg@linux.alibaba.com" , "linux-block@vger.kernel.org" Subject: Re: [RFC] hard LOCKUP caused by race between blk_init_queue_node and blkcg_print_blkgs Date: Wed, 31 Jan 2018 16:39:17 +0000 Message-ID: <1517416756.2505.11.camel@wdc.com> References: <5ac9562b-b20a-9f5a-90c5-2187552b6f09@linux.alibaba.com> <1517347168.2589.56.camel@wdc.com> In-Reply-To: Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 List-ID: T24gV2VkLCAyMDE4LTAxLTMxIGF0IDA5OjUzICswODAwLCBKb3NlcGggUWkgd3JvdGU6DQo+IEF0 IHRoZSBmaXJzdCBnbGFuY2UsIEknbSB0aGlua2luZyBvZiBtb3ZpbmcgdGhlIGJsa2NnX2luaXRf cXVldWUgYWZ0ZXINCj4gdGhlIHF1ZXVlX2xvY2sgaXMgb3ZlcnJpZGRlbi4gQnV0IEkgZG9uJ3Qg aGF2ZSBhbiBpZGVhIHlldCB0byBhdm9pZCB0aGUNCj4gcmlzayBkdXJpbmcgY2xlYW51cC4NCj4g U2luY2UgdGhlIGluaXRpYWxpemF0aW9uIG9mIHJlcXVlc3QgcXVldWUgaXMgc28gZnVuZGFtZW50 YWwsIEknbSBub3QNCj4gc3VyZSBpZiB0aGVyZSBpcyB0aGUgc2FtZSByaXNrIGluIHNldmVyYWwg b3RoZXIgcGxhY2VzLg0KDQpIZWxsbyBKb3NlcGgsDQoNCk1vdmluZyB0aGUgYmxrY2dfaW5pdF9x dWV1ZSgpIGNhbGwgZnJvbSBibGtfYWxsb2NfcXVldWVfbm9kZSgpIGludG8NCmJsa19pbml0X2Fs bG9jYXRlZF9xdWV1ZV9ub2RlKCkgd291bGQgZHJvcCBjZ3JvdXAgc3VwcG9ydCBmcm9tIGFsbCBi bG9jaw0KZHJpdmVycyB0aGF0IGRvIG5vdCBjYWxsIGJsa19pbml0X2FsbG9jYXRlZF9xdWV1ZV9u b2RlKCkuIEkgdGhpbmsgdGhlc2UNCmRyaXZlcnMgYXJlIGJyZCwgZHJiZCwgbnVsbF9ibGssIHBr dGNkdmQsIHBzM3ZyYW0sIHJzeHgsIHVtZW0sIHpyYW0sDQpsaWdodG52bSwgYmNhY2hlLCBkbSBp biBiaW8gbW9kZSwgbWQsIG52ZGltbSwgdGhlIE5WTWUgbXVsdGlwYXRoIGRyaXZlciwNCmRjc3Ni bGsgYW5kIHhwcmFtLiBUaGVzZSBkcml2ZXJzIGNhbiBiZSBmb3VuZCBieSBzZWFyY2hpbmcgZm9y DQpibGtfcXVldWVfbWFrZV9yZXF1ZXN0KCkgY2FsbHMgaW4gdGhlIGtlcm5lbCBzb3VyY2UgY29k ZS4gSSdtIG5vdCBzdXJlIHdlDQpjYW4gZHJvcCBjZ3JvdXAgc3VwcG9ydCBmcm9tIGFsbCB0aGVz ZSBibG9jayBkcml2ZXJzLg0KDQpCYXJ0Lg==