From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: [REGRESSION] 4.9-rc4+ doesn't boot on my test box Date: Tue, 8 Nov 2016 10:42:37 -0700 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-it0-f53.google.com ([209.85.214.53]:33338 "EHLO mail-it0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754038AbcKHRmk (ORCPT ); Tue, 8 Nov 2016 12:42:40 -0500 Received: by mail-it0-f53.google.com with SMTP id e187so33328653itc.0 for ; Tue, 08 Nov 2016 09:42:40 -0800 (PST) Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi Cc: Kashyap Desai , "Martin K. Petersen" Hi, I wasted half a day on this, thinking it was something in my 4.10 branches. But it turns out it is not, the regression is in mainline. Looking at the recent fixes, turns out to be this one: commit 1e793f6fc0db920400574211c48f9157a37e3945 Author: Kashyap Desai Date: Fri Oct 21 06:33:32 2016 -0700 scsi: megaraid_sas: Fix data integrity failure for JBOD (passthrough) devices If I revert that, box boots fine again. The effect of the regression is that my box detects tons of SCSI devices (literally, thousands): [ 11.675834] sd 0:2:0:0: [sda] Sector size 0 reported, assuming 512. [ 11.675840] sd 0:2:0:0: Attached scsi generic sg0 type 0 [ 11.676096] sd 0:2:1:0: Attached scsi generic sg1 type 0 [ 11.676099] sd 0:2:1:0: [sdb] Sector size 0 reported, assuming 512. [ 11.676105] sd 0:2:1:0: [sdb] 1 512-byte logical blocks: (512 B/512 B) [ 11.676107] sd 0:2:1:0: [sdb] 0-byte physical blocks [ 11.676132] sd 0:2:1:0: [sdb] Write Protect is off [ 11.676170] sd 0:2:1:0: [sdb] Asking for cache data failed [ 11.676173] sd 0:2:1:0: [sdb] Assuming drive cache: write through [ 11.676410] sd 0:2:2:0: Attached scsi generic sg2 type 0 [ 11.676432] sd 0:2:2:0: [sdc] Sector size 0 reported, assuming 512. [ 11.676435] sd 0:2:2:0: [sdc] 1 512-byte logical blocks: (512 B/512 B) [ 11.676438] sd 0:2:2:0: [sdc] 0-byte physical blocks [ 11.676442] sd 0:2:1:0: [sdb] Sector size 0 reported, assuming 512. [ 11.676454] sd 0:2:2:0: [sdc] Write Protect is off [ 11.676476] sd 0:2:2:0: [sdc] Asking for cache data failed [ 11.676478] sd 0:2:2:0: [sdc] Assuming drive cache: write through [...] [ 11.717641] sd 0:3:63:0: Attached scsi generic sg127 type 0 [ 11.717757] sd 0:3:62:0: [sddw] Sector size 0 reported, assuming 512. [ 11.717801] sd 0:3:63:0: [sddx] Sector size 0 reported, assuming 512. [ 11.717802] sd 0:3:62:0: [sddw] Attached SCSI disk [ 11.718011] sd 0:3:63:0: [sddx] Sector size 0 reported, assuming 512. where a normal boots just detects sda and the CD-ROM: [ 10.398120] sd 0:2:0:0: Attached scsi generic sg0 type 0 [ 10.398369] sd 0:2:0:0: [sda] 975699968 512-byte logical blocks: (500 GB/465 GiB) [ 10.398684] sd 0:2:0:0: [sda] Write Protect is off [ 10.398872] sd 0:2:0:0: [sda] Write cache: disabled, read cache: enabled, supports DPO and FUA [ 10.435084] sda: sda1 sda2 < sda5 sda6 > sda3 [ 10.437522] scsi 5:0:0:0: CD-ROM TEAC DVD-ROM DV-28SW R.2B PQ: 0 ANSI: 5 [ 10.456582] sd 0:2:0:0: [sda] Attached SCSI disk [ 10.500499] sr 5:0:0:0: [sr0] scsi3-mmc drive: 24x/24x cd/rw xa/form2 cdda tray [ 10.508830] cdrom: Uniform CD-ROM driver Revision: 3.20 [ 10.515186] sr 5:0:0:0: Attached scsi generic sg1 type 5 -- Jens Axboe