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Tue, 7 May 2024 09:02:32 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id OIEOGCjuOWalRgAAD6G6ig (envelope-from ); Tue, 07 May 2024 09:02:32 +0000 Date: Tue, 7 May 2024 11:02:30 +0200 From: Oscar Salvador To: Jane Chu 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 Message-ID: References: <20240501232458.3919593-1-jane.chu@oracle.com> <20240501232458.3919593-2-jane.chu@oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240501232458.3919593-2-jane.chu@oracle.com> X-Rspamd-Queue-Id: 76F834001B X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: ibmbwpt48f6quunpeu8o8rnre13j3hqe X-HE-Tag: 1715072554-650278 X-HE-Meta: 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 EJor8gfr OgFuRuZDpKuqo4T4IgVhvlfqr5r+yDazr/m8kZltOkIs3wV+Zs9GwEfxyg09cbSzDKFF0Qodh8eVEDiZEYkRYvFiQO4mqQpvIEhNDjBmkuxdIOekff9xJXc/RVTLenUkFQH4OvWLSSkFGsTdzm0QEVGSoynHBy+VAJjKs1tHsCfyud2ElVnR9hVR1akQBaR0ZuAesEIFHTN/Z6oS4IqKrC+BpsDg/s9TuQl/xyElwXDC8yEoQQZcksDd27g0+B2o/budinnMWM0sMRS/dWPkVUut9YQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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