[powerpc][next-20210727] Boot failure - kernel BUG at arch/powerpc/kernel/interrupt.c:98!

[Sachin Sant]

> On 28-Jul-2021, at 11:05 PM, Nathan Chancellor <nathan at kernel.org> wrote:
> 
> On Wed, Jul 28, 2021 at 01:31:06PM +0530, Sachin Sant wrote:
>> linux-next fails to boot on Power server (POWER8/POWER9). Following traces
>> are seen during boot
>> 
>> [    0.010799] software IO TLB: tearing down default memory pool
>> [    0.010805] ------------[ cut here ]------------
>> [    0.010808] kernel BUG at arch/powerpc/kernel/interrupt.c:98!
>> [    0.010812] Oops: Exception in kernel mode, sig: 5 [#1]
…….
> 
> I noticed this with OpenSUSE's ppc64le config [1] and my bisect landed on
> commit ad6c00283163 ("swiotlb: Free tbl memory in swiotlb_exit()"). That

Indeed. Thanks Nathan.
Bisect points to this commit.  Reverting the commit allows the kernel to boot.

Thanks
-Sachin

> series just keeps on giving... Adding some people from that thread to
> this one. Original thread:
> https://lore.kernel.org/r/1905CD70-7656-42AE-99E2-A31FC3812EAC@linux.vnet.ibm.com/
> 
> [1]: https://github.com/openSUSE/kernel-source/raw/master/config/ppc64le/default
> 
> Cheers,
> Nathan