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From: David Mozes <david.mozes@silk.us>
To: Wei Liu <wei.liu@kernel.org>
Cc: "David Moses" <mosesster@gmail.com>,
	"Michael Kelley" <mikelley@microsoft.com>,
	"תומר אבוטבול" <tomer432100@gmail.com>,
	"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH] x86/hyper-v: guard against cpu mask changes in hyperv_flush_tlb_others()
Date: Sun, 22 Aug 2021 16:25:19 +0000	[thread overview]
Message-ID: <VI1PR0401MB2415F41E0D6B43411779911AF1C39@VI1PR0401MB2415.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <20210822152436.mqfwv3xbqfxy33os@liuwe-devbox-debian-v2>

This is not visible since we need a very high load to reproduce. 
We have tried a lot but can't achieve the desired load 
On our kernel with less load, it is not reproducible as well.

-----Original Message-----
From: Wei Liu <wei.liu@kernel.org> 
Sent: Sunday, August 22, 2021 6:25 PM
To: David Mozes <david.mozes@silk.us>
Cc: David Moses <mosesster@gmail.com>; Wei Liu <wei.liu@kernel.org>; Michael Kelley <mikelley@microsoft.com>; תומר אבוטבול <tomer432100@gmail.com>; linux-hyperv@vger.kernel.org; linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86/hyper-v: guard against cpu mask changes in hyperv_flush_tlb_others()

On Thu, Aug 19, 2021 at 07:55:06AM +0000, David Mozes wrote:
> Hi Wei ,
> I move the print cpumask to other two places after the treatment on the empty mask see below
> And I got the folwing:
> 
> 
> Aug 19 02:01:51 c-node05 kernel: [25936.562674] Hyper-V: ERROR_HYPERV2: cpu_last=
> Aug 19 02:01:51 c-node05 kernel: [25936.562686] WARNING: CPU: 11 PID: 56432 at arch/x86/include/asm/mshyperv.h:301 hyperv_flush_tlb_others+0x23f/0x7b0
> 
> So we got empty on different place on the code .
> Let me know if you need further information from us.
> How you sagest to handle this situation?
> 

Please find a way to reproduce this issue with upstream kernels.

Thanks,
Wei.

  reply	other threads:[~2021-08-22 16:25 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CA+qYZY3a-FHfWNL2=na6O8TRJYu9kaeyp80VNDxaDTi2EBGoog@mail.gmail.com>
2021-08-06 10:43 ` [PATCH] x86/hyper-v: guard against cpu mask changes in hyperv_flush_tlb_others() Michael Kelley
2021-08-06 17:35   ` David Mozes
     [not found]     ` <CAHkVu0-ZCXDRZL92d_G3oKpPuKvmY=YEbu9nbx9vkZHnhHFD8Q@mail.gmail.com>
2021-08-06 21:51       ` Michael Kelley
2021-08-07  5:00         ` David Moses
2021-08-17  9:16           ` David Mozes
2021-08-17 11:29             ` Wei Liu
2021-08-19 11:05               ` David Mozes
     [not found]               ` <CA+qYZY1U04SkyHo7X+rDeE=nUy_X5nxLfShyuLJFzXnFp2A6uw@mail.gmail.com>
     [not found]                 ` <VI1PR0401MB24153DEC767B0126B1030E07F1C09@VI1PR0401MB2415.eurprd04.prod.outlook.com>
2021-08-22 15:24                   ` Wei Liu
2021-08-22 16:25                     ` David Mozes [this message]
2021-08-22 17:32                       ` Wei Liu
     [not found] <VI1PR0401MB24150B31A1D63176BBB788D2F1F19@VI1PR0401MB2415.eurprd04.prod.outlook.com>
2021-08-05 18:08 ` Michael Kelley
2020-10-01  1:38 Sasha Levin
2020-10-01  9:40 ` Vitaly Kuznetsov
2020-10-01 11:53   ` Wei Liu
2020-10-01 13:04     ` Sasha Levin
2020-10-03 17:40       ` Michael Kelley
2020-10-05 14:58         ` Wei Liu
2021-01-05 16:59           ` Michael Kelley
2021-01-05 17:10             ` Wei Liu
2021-01-08 15:22             ` Sasha Levin
2020-10-01 13:10     ` Vitaly Kuznetsov

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