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From: Tony Luck <tony.luck@gmail.com>
To: "HORIGUCHI NAOYA(堀口 直也)" <naoya.horiguchi@nec.com>
Cc: Oscar Salvador <osalvador@suse.de>,
	Aili Yao <yaoaili@kingsoft.com>,
	"david@redhat.com" <david@redhat.com>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"bp@alien8.de" <bp@alien8.de>,
	"tglx@linutronix.de" <tglx@linutronix.de>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"hpa@zytor.com" <hpa@zytor.com>,
	"x86@kernel.org" <x86@kernel.org>,
	"inux-edac@vger.kernel.org" <inux-edac@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"yangfeng1@kingsoft.com" <yangfeng1@kingsoft.com>
Subject: Re: [PATCH] mm,hwpoison: return -EBUSY when page already poisoned
Date: Thu, 25 Feb 2021 19:26:47 -0800	[thread overview]
Message-ID: <CA+8MBbKtEuDb3XSNnQFNHOxOS4x=LNrxvCgvBH1yuLK72Ab_CA@mail.gmail.com> (raw)
In-Reply-To: <20210226021907.GA27861@hori.linux.bs1.fc.nec.co.jp>

On Thu, Feb 25, 2021 at 6:23 PM HORIGUCHI NAOYA(堀口　直也)
<naoya.horiguchi@nec.com> wrote:
>
> On Thu, Feb 25, 2021 at 10:15:42AM -0800, Luck, Tony wrote:

> > CPU3 reads the poison and starts along same path that CPU2
> > did.
>
> I think that the MCE loop happening on CPU2 and CPU3 is unexpected
> and these threads should immediately kill the current process on
> each CPU.  force_sig_mceerr() in kill_me_maybe() is supposed to do it,
> so Aili's patch would fix this issue too?

It would stop the looping. But for the case where the error came from
user code we don't have
the virtual address that was accessed at this point (normally this
address is found during the
reverse lokup from the physical address inside memory_failure()).

So we can send a generic SIGBUS, but not one with the usual extra
information about the
location of the error.

-Tony

  parent reply	other threads:[~2021-02-26  3:28 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-24  7:16 [PATCH] mm,hwpoison: return -EBUSY when page already poisoned Aili Yao
2021-02-24 10:10 ` David Hildenbrand
2021-02-24 10:31 ` Oscar Salvador
2021-02-25  3:43   ` Aili Yao
2021-02-25 11:28     ` HORIGUCHI NAOYA(堀口　直也)
2021-02-25 11:39       ` Oscar Salvador
2021-02-25 12:38         ` HORIGUCHI NAOYA(堀口　直也)
2021-02-25 18:15           ` Luck, Tony
2021-02-26  2:19             ` HORIGUCHI NAOYA(堀口　直也)
2021-02-26  2:59               ` Aili Yao
2021-03-03  3:39                 ` Luck, Tony
2021-03-03  3:57                   ` Aili Yao
2021-03-03  8:39                     ` Aili Yao
2021-03-03 15:41                       ` Luck, Tony
2021-03-04  2:16                         ` Aili Yao
2021-03-04  4:19                           ` Aili Yao
2021-03-04  6:45                             ` Aili Yao
2021-03-04 23:57                               ` Luck, Tony
2021-03-05  1:30                                 ` Aili Yao
2021-03-05  1:36                                   ` Aili Yao
2021-03-05 22:11                                     ` Luck, Tony
2021-03-08  6:45                                       ` HORIGUCHI NAOYA(堀口　直也)
2021-03-08 18:54                                         ` Luck, Tony
2021-03-08 22:38                                           ` HORIGUCHI NAOYA(堀口　直也)
2021-03-08 22:55                                             ` [PATCH] mm/memory-failure: Use a mutex to avoid memory_failure() races Luck, Tony
2021-03-08 23:42                                               ` HORIGUCHI NAOYA(堀口　直也)
2021-03-09  2:04                                               ` Aili Yao
2021-03-09  6:04                                                 ` HORIGUCHI NAOYA(堀口　直也)
2021-03-09  6:35                                                   ` [PATCH v2] mm,hwpoison: return -EBUSY when page already poisoned Aili Yao
2021-03-09  8:28                                                     ` HORIGUCHI NAOYA(堀口　直也)
2021-03-09 20:01                                                       ` Luck, Tony
2021-03-10  8:05                                                         ` HORIGUCHI NAOYA(堀口　直也)
2021-03-13  1:55                                                         ` Jue Wang
2021-03-13  1:55                                                           ` Jue Wang
2021-03-10  8:01                                                       ` Aili Yao
2021-03-31 11:25                                                     ` [PATCH v3] mm,hwpoison: return -EHWPOISON " Aili Yao
2021-04-01 15:33                                                       ` Luck, Tony
2021-04-02  1:18                                                         ` Aili Yao
2021-04-02 15:11                                                           ` Luck, Tony
2021-04-05 13:50                                                             ` HORIGUCHI NAOYA(堀口　直也)
2021-04-06  1:04                                                               ` Aili Yao
2021-03-09  6:38                                                   ` [PATCH] mm/memory-failure: Use a mutex to avoid memory_failure() races Aili Yao
2021-03-05 15:55                                   ` [PATCH] mm,hwpoison: return -EBUSY when page already poisoned Luck, Tony
2021-03-10  6:10                                     ` Aili Yao
2021-03-11  8:55                                       ` HORIGUCHI NAOYA(堀口　直也)
2021-03-11 11:23                                         ` Aili Yao
2021-03-11 17:05                                         ` Luck, Tony
2021-03-12  5:55                                           ` Aili Yao
2021-03-12 16:29                                             ` Luck, Tony
2021-03-12 23:48                                               ` Luck, Tony
2021-03-16  6:42                                                 ` HORIGUCHI NAOYA(堀口　直也)
2021-03-16  7:54                                                   ` Aili Yao
2021-03-17  0:29                                                 ` Luck, Tony
2021-03-17  9:07                                                   ` Aili Yao
2021-03-17  7:48                                         ` Aili Yao
2021-03-17  8:23                                           ` Aili Yao
2021-02-26  3:26               ` Tony Luck [this message]
2021-02-26  3:26                 ` Tony Luck
2021-02-26  2:52         ` Aili Yao
2021-02-26 17:58           ` Luck, Tony
2021-03-02  4:32             ` Aili Yao
2021-03-31 10:56         ` Aili Yao
2021-03-31 10:58           ` David Hildenbrand
2021-03-01 23:21 Jue Wang

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