From: Thomas Gleixner <tglx@kernel.org>
To: Mathias Stearn <mathias@mongodb.com>, Dmitry Vyukov <dvyukov@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Jinjie Ruan <ruanjinjie@huawei.com>,
linux-man@vger.kernel.org, Mark Rutland <mark.rutland@arm.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Boqun Feng <boqun.feng@gmail.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
Chris Kennelly <ckennelly@google.com>,
regressions@lists.linux.dev, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Ingo Molnar <mingo@kernel.org>,
Blake Oler <blake.oler@mongodb.com>,
Florian Weimer <fweimer@redhat.com>,
Rich Felker <dalias@libc.org>,
Matthew Wilcox <willy@infradead.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Linus Torvalds <torvalds@linuxfoundation.org>
Subject: Re: [REGRESSION] rseq: refactoring in v6.19 broke everyone on arm64 and tcmalloc everywhere
Date: Tue, 28 Apr 2026 17:46:44 +0200 [thread overview]
Message-ID: <87wlxrxf2z.ffs@tglx> (raw)
In-Reply-To: <CAHnCjA2sCwOumOjWm=wW=Kj0C83KVW5zS+51=9=YSeAzuEaVQA@mail.gmail.com>
On Tue, Apr 28 2026 at 15:31, Mathias Stearn wrote:
> On Tue, Apr 28, 2026 at 11:54 AM Dmitry Vyukov <dvyukov@google.com> wrote:
>>
>> On Tue, 28 Apr 2026 at 10:18, Thomas Gleixner <tglx@kernel.org> wrote:
>> >
>> > Is there a pre-compiled version of those tcmalloc tests somewhere?
>>
>> I've attached an archive with 2 tests that I used.
>
> Here is an additional test. It is the stress test I used to show that
> it could result in two live allocations getting the same address. It
> will run for up to a minute or until the first double allocation gets
> detected (usually within 30ms on 6.19).
Thanks to both of you for providing those binaries.
I've run all three binaries now on my latest version in parallel for
quite same time and it seems to hold up. Mark just told me privately
that these plus the arm64 fix he's working on survive that double
allocation test.
Let me go and write a cover letter and post the pile.
Thanks,
tglx
next prev parent reply other threads:[~2026-04-28 15:46 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAHnCjA25b+nO2n5CeifknSKHssJpPrjnf+dtr7UgzRw4Zgu=oA@mail.gmail.com>
2026-04-22 12:56 ` [REGRESSION] rseq: refactoring in v6.19 broke everyone on arm64 and tcmalloc everywhere Peter Zijlstra
2026-04-22 13:13 ` Peter Zijlstra
2026-04-23 10:38 ` Mathias Stearn
[not found] ` <CAHnCjA2fa+dP1+yCYNQrTXQaW-JdtfMj7wMikwMeeCRg-3NhiA@mail.gmail.com>
2026-04-23 11:48 ` Thomas Gleixner
2026-04-23 12:11 ` Mathias Stearn
2026-04-23 17:19 ` Thomas Gleixner
2026-04-23 17:38 ` Chris Kennelly
2026-04-23 17:47 ` Mathieu Desnoyers
2026-04-23 19:39 ` Thomas Gleixner
2026-04-23 17:41 ` Linus Torvalds
2026-04-23 18:35 ` Mathias Stearn
2026-04-23 18:53 ` Mark Rutland
2026-04-23 21:03 ` Thomas Gleixner
2026-04-23 21:28 ` Linus Torvalds
2026-04-23 23:08 ` Linus Torvalds
2026-04-27 7:06 ` Florian Weimer
2026-04-27 16:12 ` Linus Torvalds
2026-04-22 13:09 ` Mark Rutland
2026-04-22 17:49 ` Thomas Gleixner
2026-04-22 18:11 ` Mark Rutland
2026-04-22 19:47 ` Thomas Gleixner
2026-04-23 1:48 ` Jinjie Ruan
2026-04-23 5:53 ` Dmitry Vyukov
2026-04-23 10:39 ` Thomas Gleixner
2026-04-23 10:51 ` Mathias Stearn
2026-04-23 12:24 ` David Laight
2026-04-23 19:31 ` Thomas Gleixner
2026-04-24 7:56 ` Dmitry Vyukov
2026-04-24 8:32 ` Mathias Stearn
2026-04-24 9:30 ` Dmitry Vyukov
2026-04-24 14:16 ` Thomas Gleixner
2026-04-24 15:03 ` Peter Zijlstra
2026-04-24 19:44 ` Thomas Gleixner
2026-04-26 22:04 ` Thomas Gleixner
2026-04-27 7:40 ` Florian Weimer
2026-04-27 11:03 ` Thomas Gleixner
2026-04-27 18:35 ` Mathieu Desnoyers
2026-04-27 21:06 ` Thomas Gleixner
2026-04-28 6:11 ` Dmitry Vyukov
2026-04-28 8:07 ` Thomas Gleixner
2026-04-28 8:18 ` Thomas Gleixner
[not found] ` <CACT4Y+b_RH2eZMuh1YUyqnoK-5KUpdWW4z1q2ZQWkY_GcBqmNw@mail.gmail.com>
[not found] ` <CAHnCjA2sCwOumOjWm=wW=Kj0C83KVW5zS+51=9=YSeAzuEaVQA@mail.gmail.com>
2026-04-28 15:46 ` Thomas Gleixner [this message]
2026-04-28 7:39 ` Peter Zijlstra
2026-04-28 8:13 ` Peter Zijlstra
2026-04-28 8:51 ` Thomas Gleixner
2026-04-28 8:03 ` Peter Zijlstra
2026-04-28 8:36 ` Thomas Gleixner
2026-04-23 12:11 ` Alejandro Colomar
2026-04-23 12:54 ` Mathieu Desnoyers
2026-04-23 12:29 ` Mathieu Desnoyers
2026-04-23 12:36 ` Dmitry Vyukov
2026-04-23 12:53 ` Mathieu Desnoyers
2026-04-23 12:58 ` Dmitry Vyukov
2026-04-24 16:45 ` [PATCH] arm64/entry: Fix arm64-specific rseq brokenness (was: Re: [REGRESSION] rseq: refactoring in v6.19 broke everyone on arm64) " Mark Rutland
2026-04-28 1:39 ` [PATCH] arm64/entry: Fix arm64-specific rseq brokenness Jinjie Ruan
2026-04-28 13:40 ` Mark Rutland
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