linux-kernel - Re: 4.15.14 crash with iscsi target and dvd

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Message-ID: <20180407165335.GA2515@animx.eu.org>
Date:   Sat, 7 Apr 2018 12:53:36 -0400
From:   Wakko Warner <wakko@...mx.eu.org>
To:     Bart Van Assche <Bart.VanAssche@....com>
Cc:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "richard.weinberger@...il.com" <richard.weinberger@...il.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>
Subject: Re: 4.15.14 crash with iscsi target and dvd

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 <linux/kbuild.h>
 
scripts/Makefile.build:153: recipe for target 'scripts/mod/devicetable-offsets.s' failed

I don't think it found the bad commit.

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