In message <20071019191433.GK26913@lazybastard.org>, =?utf-8?B?SsO2cm4=?= Engel writes:
quoted text > On Fri, 19 October 2007 13:53:40 -0400, Erez Zadok wrote:
> >
> > I've been having this problem for some time with mtd, which I use to mount
> > jffs2 images (for unionfs testing). I've seen it in several recent major
> > kernels, including 2.6.24. Here's the sequence of ops I perform:
>
> Since when roughly? 2.6.20ish? Before?
Yeah, I guess around that time. If you want, I could go back and test each
of my backports and see if it has the lockdep message or not.
quoted text > > # cp jffs2-empty.img /tmp/foo
> > # losetup /dev/loop0 /tmp/foo
> > # modprobe mtdblock
> > # modprobe block2mtd block2mtd=/dev/loop0,128ki
> > # mount -t jffs2 /dev/mtdblock0 /n/lower/b0
>
> Side note: you don't need mtdblock:
> # cp jffs2-empty.img /tmp/foo
> # losetup /dev/loop0 /tmp/foo
> # modprobe block2mtd block2mtd=/dev/loop0,128ki
> # mount -t jffs2 mtd0 /n/lower/b0
>
> It doesn't really hurt, 'tis just superfluous.
Neat. Curious, but where does "mtd0" come from then? It's not in my /dev
(which uses devfs on an FC6 system).
quoted text > > The jffs2-empty.img is a small jffs2 image, of an empty directory, created
> > w/ the jffs2 utils. At the point I modprobe block2mtd, I get the following
> > lockdep warning and a "BUG" message:
> >
> > BUG: key f88e1340 not in .data!
> > WARNING: at kernel/lockdep.c:2331 lockdep_init_map()
> > [<c0102bc2>] show_trace_log_lvl+0x1a/0x2f
> > [<c0103692>] show_trace+0x12/0x14
> > [<c01037b2>] dump_stack+0x15/0x17
> > [<c0125432>] lockdep_init_map+0x94/0x3e4
> > [<c0125001>] debug_mutex_init+0x2c/0x3c
> > [<c01210d4>] __mutex_init+0x38/0x40
> > [<f88e01d3>] 0xf88e01d3
> > [<c011dda7>] parse_args+0x123/0x200
> > [<c012b725>] sys_init_module+0xdd0/0x122c
> > [<c0102586>] sysenter_past_esp+0x5f/0x91
> > =======================
> > block2mtd: mtd0: [d: /dev/loop0] erase_size = 128KiB [131072]
> > block2mtd: version $Revision: 1.30 $
>
> Could be my problem. I'll see if I can reproduce it. Can you send me
> your .config or a link to it?
See below.
quoted text > J
