linux-kernel - Re: [PATCH v2] mm: hwpoison: coredump: support recovery from dump_user

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Date:   Fri, 28 Apr 2023 16:56:49 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     HORIGUCHI NAOYA(堀口 直也) 
        <naoya.horiguchi@....com>
CC:     "Luck, Tony" <tony.luck@...el.com>,
        "chu, jane" <jane.chu@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Tong Tiangen <tongtiangen@...wei.com>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH v2] mm: hwpoison: coredump: support recovery from
 dump_user_range()



On 2023/4/27 10:31, HORIGUCHI NAOYA(堀口 直也) wrote:
> On Thu, Apr 27, 2023 at 09:06:46AM +0800, Kefeng Wang wrote:
>>
>>
...
>> For coredump，the task work will be called too, see following code,
>>
>> get_signal
>> 	sig_kernel_coredump
>> 		elf_core_dump
>> 			dump_user_range
>> 				_copy_from_iter // with MC-safe copy, return without panic
>> 	do_group_exit(ksig->info.si_signo);
>> 		do_exit
>> 			exit_task_work
>> 				task_work_run
>> 					kill_me_never
>> 						memory_failure
>>
>> I also add debug print to check the memory_failure() processing after
>> add MCE_IN_KERNEL_COPYIN to MCE_SAFE exception type, also tested CoW of
>> normal page and huge page, it works too.
> 
> Sounds nice to me.
> Maybe this information is worth documenting in the patch description.
> 

Sure, will make a formal patch and send out, thanks.

> Thanks,
> Naoya Horiguchi