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SubjectRe: kmemleak panic
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On 1/21/2019 7:24 PM, Marc Gonzalez wrote:
> On 21/01/2019 14:35, Rob Herring wrote:
>
>> On Mon, Jan 21, 2019 at 6:19 AM Robin Murphy wrote:
>>> On 21/01/2019 11:57, Marc Gonzalez wrote:
>>> [...]
>>>> # echo dump=0xffffffc021e00000 > /sys/kernel/debug/kmemleak
>>>> kmemleak: Object 0xffffffc021e00000 (size 2097152):
>>>> kmemleak: comm "swapper/0", pid 0, jiffies 4294892296
>>>> kmemleak: min_count = 0
>>>> kmemleak: count = 0
>>>> kmemleak: flags = 0x1
>>>> kmemleak: checksum = 0
>>>> kmemleak: backtrace:
>>>> kmemleak_alloc_phys+0x48/0x60
>>>> memblock_alloc_range_nid+0x8c/0xa4
>>>> memblock_alloc_base_nid+0x4c/0x60
>>>> __memblock_alloc_base+0x3c/0x4c
>>>> early_init_dt_alloc_reserved_memory_arch+0x54/0xa4
>>>> fdt_init_reserved_mem+0x308/0x3ec
>>>> early_init_fdt_scan_reserved_mem+0x88/0xb0
>>>> arm64_memblock_init+0x1dc/0x254
>>>> setup_arch+0x1c8/0x4ec
>>>> start_kernel+0x84/0x44c
>>>> 0xffffffffffffffff
>>> OK, so via the __va(phys) call in kmemleak_alloc_phys(), you end up with
>>> the linear map address of a no-map reservation, which unsurprisingly
>>> turns out not to be mapped. Is there a way to tell kmemleak that it
>>> can't scan within a particular object?

Yes,  kmemleak_no_scan() do this which is done in patch
https://patchwork.ozlabs.org/patch/995367/

This was done to avoid kmemleak scanning on the blocks which are nomaped
and should not have linear mapping created in kernel page table.

>> There was this patch posted[1]. I never got a reply, so it hasn't been applied.
>>
>> Rob
>>
>> https://patchwork.ozlabs.org/patch/995367/
> It is worth noting that the author's email address appears to be dead.
> <schowdary@nvidia.com>: host hqemgate08.nvidia.com[216.228.121.117] said:
> 550 #5.1.0 Address rejected. (in reply to RCPT TO command)
>
> Adding a few nvidia devs for comment.

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