From: Oscar Salvador <osalvador@suse.de>
To: Jane Chu <jane.chu@oracle.com>
Cc: linmiaohe@huawei.com, nao.horiguchi@gmail.com,
akpm@linux-foundation.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] mm/memory-failure: try to send SIGBUS even if unmap failed
Date: Tue, 7 May 2024 11:02:30 +0200 [thread overview]
Message-ID: <ZjnuJgUVVnwYrr5p@localhost.localdomain> (raw)
In-Reply-To: <20240501232458.3919593-2-jane.chu@oracle.com>
On Wed, May 01, 2024 at 05:24:56PM -0600, Jane Chu wrote:
> For years when it comes down to kill a process due to hwpoison,
> a SIGBUS is delivered only if unmap has been successful.
> Otherwise, a SIGKILL is delivered. And the reason for that is
> to prevent the involved process from accessing the hwpoisoned
> page again.
>
> Since then a lot has changed, a hwpoisoned page is marked and
> upon being re-accessed, the process will be killed immediately.
> So let's take out the '!unmap_success' factor and try to deliver
> SIGBUS if possible.
I am missing some details here.
An unmapped hwpoison page will trigger a fault and will return
VM_FAULT_HWPOISON all the way down and then deliver SIGBUS,
but if the page was not unmapped, how will this be catch upon
re-accessing? Will the system deliver a MCE event?
--
Oscar Salvador
SUSE Labs
next prev parent reply other threads:[~2024-05-07 9:02 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-01 23:24 [PATCH 0/3] Enhance soft hwpoison handling and injection Jane Chu
2024-05-01 23:24 ` [PATCH 1/3] mm/memory-failure: try to send SIGBUS even if unmap failed Jane Chu
2024-05-07 9:02 ` Oscar Salvador [this message]
2024-05-07 17:54 ` Jane Chu
2024-05-08 12:06 ` Oscar Salvador
2024-05-08 16:51 ` Jane Chu
2024-05-08 7:47 ` Miaohe Lin
2024-05-08 16:58 ` Jane Chu
2024-05-09 2:54 ` Miaohe Lin
2024-05-09 16:40 ` Jane Chu
2024-05-01 23:24 ` [PATCH 2/3] mm/madvise: Add MF_ACTION_REQUIRED to madvise(MADV_HWPOISON) Jane Chu
2024-05-05 7:02 ` Miaohe Lin
2024-05-06 19:54 ` Jane Chu
2024-05-08 7:58 ` Miaohe Lin
2024-05-01 23:24 ` [PATCH 3/3] mm/memory-failure: send SIGBUS in the event of thp split fail Jane Chu
2024-05-05 7:00 ` Miaohe Lin
2024-05-06 20:26 ` Jane Chu
2024-05-08 8:08 ` Miaohe Lin
2024-05-08 17:45 ` Jane Chu
2024-05-09 8:30 ` Miaohe Lin
2024-05-09 15:34 ` Jane Chu
2024-05-10 2:59 ` Miaohe Lin
2024-05-10 3:18 ` Jane Chu
2024-05-08 9:03 ` Miaohe Lin
2024-05-08 16:56 ` Jane Chu
2024-05-09 8:52 ` Miaohe Lin
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