Re: Linux 2.6.24-rc5 x86 architecture no longer Oopses...

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On Thursday, 20 of December 2007, Andrew Morton wrote:
> On Thu, 20 Dec 2007 14:54:15 -0800
> Andrew Morton <[email protected]> wrote:
> 
> > On Thu, 20 Dec 2007 17:40:47 -0500
> > Trond Myklebust <[email protected]> wrote:
> > 
> > > I just got the following interesting behaviour. Never mind why the
> > > original Oops (I was testing some experimental RPC patches), but there
> > > appears to be a BUG_ON() triggered inside the dump() call.
> > > 
> > > Oops occurred with a build based on this afternoon's git tree from Linus
> > > (v2.6.24-rc5-317-gfaa4877)...
> > > 
> > > Cheers
> > >   Trond
> > > ---------
> > > 
> > > BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000
> > > printing eip: f8bcc8b3 *pde = 00000000 
> > > BUG: using smp_processor_id() in preemptible [00000001] code: mount.nfs4/2970
> > > caller is die+0x59/0x202
> > > Pid: 2970, comm: mount.nfs4 Not tainted 2.6.24-rc5-ga747a088 #1
> > >  [<c0405170>] show_trace_log_lvl+0x1a/0x2f
> > >  [<c0405a76>] show_trace+0x12/0x14
> > >  [<c0405dc6>] dump_stack+0x6c/0x72
> > >  [<c04e4cd8>] debug_smp_processor_id+0xa0/0xb4
> > >  [<c0405462>] die+0x59/0x202
> > >  [<c05b3e7d>] do_page_fault+0x557/0x63e
> > >  [<c05b252a>] error_code+0x72/0x78
> > >  [<f8bd821c>] rpcb_create+0x7c/0x84 [sunrpc]
> > >  [<f8bd8552>] rpcb_register+0x127/0x18c [sunrpc]
> > >  [<f8bd31d2>] svc_register+0xcf/0x14c [sunrpc]
> > >  [<f8bd399f>] __svc_create+0x19a/0x1b3 [sunrpc]
> > >  [<f8bd3b21>] svc_create+0x13/0x15 [sunrpc]
> > >  [<f8c74beb>] nfs_callback_up+0x71/0x126 [nfs]
> > >  [<f8c53cfe>] nfs_get_client+0x14e/0x3a2 [nfs]
> > >  [<f8c53f88>] nfs4_set_client+0x36/0x14f [nfs]
> > >  [<f8c54739>] nfs4_create_server+0x8e/0x36c [nfs]
> > >  [<f8c5c6f1>] nfs4_get_sb+0x2ef/0x3f3 [nfs]
> > >  [<c0477e40>] vfs_kern_mount+0x7d/0xf1
> > >  [<c0477f02>] do_kern_mount+0x37/0xbd
> > >  [<c048a6fb>] do_mount+0x5c3/0x61d
> > >  [<c048a7c4>] sys_mount+0x6f/0xa9
> > >  [<c04040b2>] sysenter_past_esp+0x5f/0xa5
> > >  =======================
> > 
> 
> btw, I think we should track this as a regression, please.

Added, http://bugzilla.kernel.org/show_bug.cgi?id=9610, thanks.

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