From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wakko Warner Subject: Re: 4.15.14 crash with iscsi target and dvd Date: Sat, 7 Apr 2018 12:53:36 -0400 Message-ID: <20180407165335.GA2515@animx.eu.org> References: <20180331221252.GA25573@animx.eu.org> <20180401113721.GA8471@animx.eu.org> <20180401163604.GB25011@animx.eu.org> <20180401182723.GA31755@animx.eu.org> <595a10cfb387e6b2ab4d2053b84fed9b3da9e079.camel@wdc.com> <20180406014644.GA16112@animx.eu.org> <20180406020651.GB16112@animx.eu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org To: Bart Van Assche Cc: "linux-scsi@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "richard.weinberger@gmail.com" , "linux-block@vger.kernel.org" List-Id: linux-scsi@vger.kernel.org Bart Van Assche wrote: > On Thu, 2018-04-05 at 22:06 -0400, Wakko Warner wrote: > > I know now why scsi_print_command isn't doing anything. cmd->cmnd is null. > > I added a dev_printk in scsi_print_command where the 2 if statements return. > > Logs: > > [ 29.866415] sr 3:0:0:0: cmd->cmnd is NULL > > That's something that should never happen. As one can see in > scsi_setup_scsi_cmnd() and scsi_setup_fs_cmnd() both functions initialize > that pointer. Since I have not yet been able to reproduce myself what you > reported, would it be possible for you to bisect this issue? You will need > to follow something like the following procedure (see also > https://git-scm.com/docs/git-bisect): After doing 3 successful compiles with good/bad, I got this error and was not able to compile any more kernels: CC scripts/mod/devicetable-offsets.s scripts/mod/empty.c:1:0: error: code model kernel does not support PIC mode /* empty file to figure out endianness / word size */ scripts/mod/devicetable-offsets.c:1:0: error: code model kernel does not support PIC mode #include scripts/Makefile.build:153: recipe for target 'scripts/mod/devicetable-offsets.s' failed I don't think it found the bad commit. -- Microsoft has beaten Volkswagen's world record. Volkswagen only created 22 million bugs.