Re: arm32: panic in move_freepages (Was [PATCH v2 0/4] arm64: drop pfn_valid_within() and simplify pfn_valid())

[Mike Rapoport]

On Fri, Apr 23, 2021 at 04:11:16PM +0800, Kefeng Wang wrote:
> 
> I tested this patchset(plus arm32 change, like arm64 does) based on lts
> 5.10，add
> 
> some debug log, the useful info shows below, if we enable HOLES_IN_ZONE, no
> panic,
> 
> any idea, thanks.
 
Are there any changes on top of 5.10 except for pfn_valid() patch?
Do you see this panic on 5.10 without the changes?
Can you see stack backtrace beyond move_freepages_block?

> Zone ranges:
>   Normal   [mem 0x0000000080a00000-0x00000000b01fffff]
>   HighMem  [mem 0x00000000b0200000-0x00000000ffffefff]
> Movable zone start for each node
> Early memory node ranges
>   node   0: [mem 0x0000000080a00000-0x00000000855fffff]
>   node   0: [mem 0x0000000086a00000-0x0000000087dfffff]
>   node   0: [mem 0x000000008bd00000-0x000000008c4fffff]
>   node   0: [mem 0x000000008e300000-0x000000008ecfffff]
>   node   0: [mem 0x0000000090d00000-0x00000000bfffffff]
>   node   0: [mem 0x00000000cc000000-0x00000000dc9fffff]
>   node   0: [mem 0x00000000de700000-0x00000000de9fffff]
>   node   0: [mem 0x00000000e0800000-0x00000000e0bfffff]
>   node   0: [mem 0x00000000f4b00000-0x00000000f6ffffff]
>   node   0: [mem 0x00000000fda00000-0x00000000ffffefff]
> 
> ----> free_memmap, start_pfn = 85800,  85800000 end_pfn = 86a00, 86a00000
> ----> free_memmap, start_pfn = 8c800,  8c800000 end_pfn = 8e300, 8e300000
> ----> free_memmap, start_pfn = 8f000,  8f000000 end_pfn = 90000, 90000000
> ----> free_memmap, start_pfn = dcc00,  dcc00000 end_pfn = de700, de700000
> ----> free_memmap, start_pfn = dec00,  dec00000 end_pfn = e0000, e0000000
> ----> free_memmap, start_pfn = e0c00,  e0c00000 end_pfn = e4000, e4000000
> ----> free_memmap, start_pfn = f7000,  f7000000 end_pfn = f8000, f8000000
> === >move_freepages: start_pfn/end_pfn [de601, de7ff], [de600000, de7ff000]
> :  pfn =de600 pfn2phy = de600000 , page = ef3cc000, page-flags = ffffffff
> 8<--- cut here ---
> Unable to handle kernel paging request at virtual address fffffffe
> pgd = 5dd50df5
> [fffffffe] *pgd=affff861, *pte=00000000, *ppte=00000000
> Internal error: Oops: 37 [#1] SMP ARM
> Modules linked in: gmac(O)
> CPU: 2 PID: 635 Comm: test-oom Tainted: G           O      5.10.0+ #31
> Hardware name: Hisilicon A9
> PC is at move_freepages_block+0x150/0x278
> LR is at move_freepages_block+0x150/0x278
> pc : [<c02383a4>]    lr : [<c02383a4>]    psr: 200e0393
> sp : c4179cf8  ip : 00000000  fp : 00000001
> r10: c4179d58  r9 : 000de7ff  r8 : 00000000
> r7 : c0863280  r6 : 000de600  r5 : 000de600  r4 : ef3cc000
> r3 : ffffffff  r2 : 00000000  r1 : ef5d069c  r0 : fffffffe
> Flags: nzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment user
> Control: 1ac5387d  Table: 83b0c04a  DAC: 55555555
> Process test-oom (pid: 635, stack limit = 0x25d667df)
> 

-- 
Sincerely yours,
Mike.