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From: "Emilio G. Cota" <cota@braap.org>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: "Peter Puhov" <peter.puhov@linaro.org>,
	"Richard Henderson" <richard.henderson@linaro.org>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	"Robert Foley" <robert.foley@linaro.org>,
	"QEMU Developers" <qemu-devel@nongnu.org>
Subject: Re: [PATCH 18/19] target/arm: Fix tsan warning in cpu.c
Date: Sat, 23 May 2020 13:18:14 -0400	[thread overview]
Message-ID: <20200523171814.GA382220@sff> (raw)
In-Reply-To: <CAFEAcA-u_vAGtn7htspqkN56Xhb-WH_x8dF7GYs46zWaBLMEvA@mail.gmail.com>

On Fri, May 22, 2020 at 23:36:18 +0100, Peter Maydell wrote:
> So is this:
>  (a) a TSan false positive, because we've analysed the use
>      of this struct field and know it's not a race because
>      [details], but which we're choosing to silence in this way
>  (b) an actual race for which the correct fix is to make the
>      accesses atomic because [details]
> 
> ?

It is (b), as shown in the per-cpu lock series. In particular,
see these two patches:
- [PATCH v9 33/74] cpu: define cpu_interrupt_request helpers
https://lists.nongnu.org/archive/html/qemu-devel/2020-05/msg06322.html
- [PATCH v9 39/74] arm: convert to cpu_interrupt_request
https://lists.nongnu.org/archive/html/qemu-devel/2020-05/msg06328.html

Since a more thorough fix is included in that other series, I think this
patch should be dropped from this series -- I'll post a reply to patch
00/19 with more details.

Thanks,

		Emilio


  reply	other threads:[~2020-05-23 17:19 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-22 16:07 [PATCH 00/19] Add Thread Sanitizer support to QEMU Robert Foley
2020-05-22 16:07 ` [PATCH 01/19] configure: add --enable-tsan flag + fiber annotations for coroutine-ucontext Robert Foley
2020-05-23 16:55   ` Philippe Mathieu-Daudé
2020-05-26 12:38     ` Robert Foley
2020-06-17 14:24   ` Stefan Hajnoczi
2020-06-17 15:56     ` Alex Bennée
2020-06-17 21:27     ` Robert Foley
2020-05-22 16:07 ` [PATCH 02/19] cpu: convert queued work to a QSIMPLEQ Robert Foley
2020-05-24 10:20   ` Philippe Mathieu-Daudé
2020-05-26 15:01     ` Robert Foley
2020-05-22 16:07 ` [PATCH 03/19] thread: add qemu_spin_destroy Robert Foley
2020-05-22 16:07 ` [PATCH 04/19] cputlb: destroy CPUTLB with tlb_destroy Robert Foley
2020-05-22 16:07 ` [PATCH 05/19] qht: call qemu_spin_destroy for head buckets Robert Foley
2020-05-22 16:07 ` [PATCH 06/19] tcg: call qemu_spin_destroy for tb->jmp_lock Robert Foley
2020-05-22 16:07 ` [PATCH 07/19] translate-all: call qemu_spin_destroy for PageDesc Robert Foley
2020-05-22 16:07 ` [PATCH 08/19] thread: add tsan annotations to QemuSpin Robert Foley
2020-05-22 16:07 ` [PATCH 09/19] tests/docker: Added docker build support for TSan Robert Foley
2020-05-22 16:07 ` [PATCH 10/19] include/qemu: Added tsan.h for annotations Robert Foley
2020-05-23 17:20   ` Emilio G. Cota
2020-05-23 21:37     ` Emilio G. Cota
2020-05-22 16:07 ` [PATCH 11/19] accel/tcg: Fixed tsan warnings related to parallel_cpus Robert Foley
2020-05-23 17:21   ` Emilio G. Cota
2020-05-22 16:07 ` [PATCH 12/19] configure: added tsan support for blacklist Robert Foley
2020-05-23 17:27   ` Emilio G. Cota
2020-05-26 14:07     ` Robert Foley
2020-05-22 16:07 ` [PATCH 13/19] accel/tcg: Fixed tsan warnings Robert Foley
2020-05-23 20:06   ` Emilio G. Cota
2020-05-26 15:14     ` Robert Foley
2020-05-26 18:47   ` Paolo Bonzini
2020-05-22 16:07 ` [PATCH 14/19] util/async: " Robert Foley
2020-05-23 20:12   ` Emilio G. Cota
2020-05-26 15:19     ` Robert Foley
2020-05-26 10:32   ` Stefan Hajnoczi
2020-05-26 15:21     ` Robert Foley
2020-05-22 16:07 ` [PATCH 15/19] qht: Fix " Robert Foley
2020-05-23 20:44   ` Emilio G. Cota
2020-05-22 16:07 ` [PATCH 16/19] util: fixed tsan warnings in thread_pool.c Robert Foley
2020-05-26 20:18   ` Paolo Bonzini
2020-05-22 16:07 ` [PATCH 17/19] util: Added tsan annotate for thread name Robert Foley
2020-05-23 20:29   ` Emilio G. Cota
2020-05-22 16:07 ` [PATCH 18/19] target/arm: Fix tsan warning in cpu.c Robert Foley
2020-05-22 17:44   ` Peter Maydell
2020-05-22 21:33     ` Robert Foley
2020-05-22 22:36       ` Peter Maydell
2020-05-23 17:18         ` Emilio G. Cota [this message]
2020-05-26 14:01           ` Robert Foley
2020-05-22 16:07 ` [PATCH 19/19] docs: Added details on TSan to testing.rst Robert Foley
2020-05-23 20:29   ` Emilio G. Cota
2020-05-22 21:07 ` [PATCH 00/19] Add Thread Sanitizer support to QEMU no-reply
2020-05-23 21:36 ` Emilio G. Cota
2020-05-26 15:18   ` Robert Foley

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