From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jens Axboe Subject: Re: blk-mq problem on proliant DL380 G3 (cciss) Date: Wed, 29 Oct 2014 09:08:46 -0600 Message-ID: <545102FE.3010003@kernel.dk> References: Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-pa0-f50.google.com ([209.85.220.50]:43095 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933143AbaJ2PIt (ORCPT ); Wed, 29 Oct 2014 11:08:49 -0400 Received: by mail-pa0-f50.google.com with SMTP id eu11so3384350pac.9 for ; Wed, 29 Oct 2014 08:08:49 -0700 (PDT) In-Reply-To: Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Meelis Roos , linux-scsi@vger.kernel.org, Christoph Hellwig On 2014-10-29 05:46, Meelis Roos wrote: >> I tried 3.18-rc2 with blk-mq default on on HP ProLiant DL380 G3 (with HP >> CCISS RAID controller). It fails late in the bootup with "task >> scsi_eh_1:720 blocked for more than 120 seconds." messages. >> >> Booting with scsi_mod.use_blk_mq=0 fixes the problem. > > Another test server with MPT SCSI RAID has similar problem, > scsi_mode.use_blk_mq=0 cures it but I can not get good trace (no serail > console). 3.18.0-rc2-00043-gf7e87a4 was tested there. The first issue looks like scsi cdrom and error handling, it must be leaking requests hence we hang on allocation of a new one. cciss doesn't use blk_mq regardless of the scsi setting. Does the mpt box also have a libata driven cdrom? -- Jens Axboe