Re: [PATCH] memblock: exclude NOMAP regions from kmemleak

Mike Rapoport
2021-10-13T11:35:27Z

On Wed, Oct 13, 2021 at 08:45:40AM +0100, Catalin Marinas wrote:
> On Wed, Oct 13, 2021 at 08:47:56AM +0300, Mike Rapoport wrote:
> > From: Mike Rapoport <rppt@linux.ibm.com>
> >
> > Vladimir Zapolskiy reports:
> >
> > commit a7259df76702 ("memblock: make memblock_find_in_range method private")
> > invokes a kernel panic while running kmemleak on OF platforms with nomaped
> > regions:
> >
> > Unable to handle kernel paging request at virtual address fff000021e00000
> > [...]
> > scan_block+0x64/0x170
> > scan_gray_list+0xe8/0x17c
> > kmemleak_scan+0x270/0x514
> > kmemleak_write+0x34c/0x4ac
> >
> > Indeed, NOMAP regions don't have linear map entries so an attempt to scan
> > these areas would fault.
> >
> > Prevent such faults by excluding NOMAP regions from kmemleak.
> >
> > Link: https://lore.kernel.org/all/8ade5174-b143-d621-8c8e-dc6a1898c6fb@linaro.org
> > Fixes: a7259df76702 ("memblock: make memblock_find_in_range method private")
> > Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> > Tested-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
>
> Acked-by: Catalin Marinas <catalin.marinas@arm.com>

Thanks!

I'm going to take it via memblock tree if that's fine with everybody.

--
Sincerely yours,
Mike.