linux-kernel - Re: [PATCH v3 0/3] arm64: kexec,kdump: fix boot failures on acpi-only system

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Date:   Tue, 10 Jul 2018 08:12:42 +0900
From:   AKASHI Takahiro <takahiro.akashi@...aro.org>
To:     James Morse <james.morse@....com>
Cc:     catalin.marinas@....com, will.deacon@....com,
        ard.biesheuvel@...aro.org, tbaicar@...eaurora.org,
        bhsharma@...hat.com, dyoung@...hat.com, mark.rutland@....com,
        al.stone@...aro.org, graeme.gregory@...aro.org,
        hanjun.guo@...aro.org, lorenzo.pieralisi@....com,
        sudeep.holla@....com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, kexec@...ts.infradead.org
Subject: Re: [PATCH v3 0/3] arm64: kexec,kdump: fix boot failures on
 acpi-only system

On Mon, Jul 09, 2018 at 11:56:36AM +0100, James Morse wrote:
> Hi Akashi,
> 
> On 09/07/18 01:07, AKASHI Takahiro wrote:
> > Patch#2 and #3 addresses kdump case. Ard's patch [4] needs to be applied
> > preliminarily.
> 
> I missed this, and was then surprised by [0], when I tested kdump.
> 
> Could you re-post this with all the dependencies in the series? These changes

No problem, but I wonder why applying patch#2 didn't fail without
Ard's as apparently the context for the given hunk is different.
---
        efi_memmap_unmap(); <== here

+       mapsize = efi.memmap.desc_size * efi.memmap.nr_map;
+
...
---

-Takahiro AKASHI

> need to be tested together and merged at the same time, otherwise kdump can't be
> tested and we risk the maintainer picking up broken code.
> 
> 
> Thanks,
> 
> James
> 
> 
> [0] failed kdump boot on Seattle
> ------------------%<------------------
> ACPI: Added _OSI(3.0 _SCP Extensions)
> ACPI: Added _OSI(Processor Aggregator Device)
> ACPI: Added _OSI(Linux-Dell-Video)
> Unable to handle kernel paging request at virtual address ffff2007
> Mem abort info:
>   ESR = 0x96000021
>   Exception class = DABT (current EL), IL = 32 bits
>   SET = 0, FnV = 0
>   EA = 0, S1PTW = 0
> Data abort info:
>   ISV = 0, ISS = 0x00000021
>   CM = 0, WnR = 0
> swapper pgtable: 4k pages, 48-bit VAs, pgdp = (____ptrval____)
> pgd=00000080ffdfd803, pud=00000080ffdfc803, pm3
> Internal error: Oops: 96000021 [#1] PREEMPT SMP
> Modules linked in:
> CPU: 1 PID: 1 Comm: swapper/0 Tainted: G S                4.18.0-1
> Hardware name: AMD Overdrive/Supercharger/Default string, BIOS RO6
> pstate: 10400005 (nzcV daif +PAN -UAO)
> pc : acpi_ns_lookup+0x550/0x740
> lr : acpi_ns_lookup+0x2f8/0x740
> [...]
> Process swapper/0 (pid: 1, stack limit = 0x(____ptrval____))
> Call trace:
>  acpi_ns_lookup+0x550/0x740
>  acpi_ds_load2_begin_op+0x568/0x87c
>   acpi_ds_exec_begin_op+0x50/0x388
>  acpi_ps_build_named_op+0x1cc/0x3dc
>  acpi_ps_create_op+0x4f4/0x864
>  acpi_ps_parse_loop+0x40c/0x133c
>  acpi_ps_parse_aml+0x1f4/0x5a8
>  acpi_ps_execute_table+0x24c/0x2e0
>  acpi_ns_execute_table+0x354/0x408
>  acpi_ns_parse_table+0x5c/0x94
>  acpi_ns_load_table+0x40/0xf8
>  acpi_tb_load_namespace+0x31c/0x510
>  acpi_load_tables+0x48/0x13c
>  acpi_init+0x170/0x5c8
>  do_one_initcall+0xc0/0x2b0
>  kernel_init_freeable+0x3d4/0x484
>  kernel_init+0x10/0x118
>  ret_from_fork+0x10/0x18
> Code: f90037a2 aa1303e0 97dfd654 f94037a2 (b9400260)
> ---[ end trace d678006368422baa ]---
> Kernel panic - not syncing: Attempted to kill init! exitcode=0x00b
> ------------------%<------------------