Re: linux-3.10+: unable to boot 31bit builds

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On Tue, Jan 21, 2014 at 04:57:39AM -0500, Mike Frysinger wrote:
> > > ------------[ cut here ]------------
> > > Kernel BUG at 0029abd6 [verbose debug info unavailable]
> > > specification exception: 0006 [#1] SMP
> > > Modules linked in:
> > > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.13.0 #4
> > > task: 005a16c8 ti: 00592000 task.ti: 00592000
> > > Krnl PSW : 070ce000 8029abd6 (lockref_get+0x3e/0x9c)
> > > 
> > >            R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0
> > > 
> > > Krnl GPRS: 00000000 00000002 00000001 00000000
> > > 
> > >            00000000 00000001 78f05a60 00000000
> > >            004b6b7e 00400000 78f05a60 78e01870
> > >            78e018c0 0041c038 00593e28 00593e08
> > > 
> > > Krnl Code: 8029abcc: a71a0001           ahi     %r1,1
> > > 
> > >            8029abd0: 1852               lr      %r5,%r2
> > >           
> > >           #8029abd2: bb40f064           cds     %r4,%r0,100(%r15)
> > >           
> > >           >8029abd6: 1943               cr      %r4,%r3
> > 
> > Yep, that's a compare and swap on not proper aligned address on
> > the stack. Which indicates that our cmpxhg64 on 32 bit is broken
> > in multiple ways.
> > 
> > The patch below will fix this crash, but not the statfs issue.
> 
> hmm, doesn't seem to work for me.  don't get a crash, just a "virtual machine 
> is placed in CP mode due to a SIGP initial C".  whatever that means :).

Ah, that probably happened because the kernel failed to mount the
root file system and killed all CPUs before printing a nice error message.

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