From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Yunseong Kim <ysk@kzalloc.com>
Cc: Dmitry Vyukov <dvyukov@google.com>,
Andrey Konovalov <andreyknvl@gmail.com>,
Byungchul Park <byungchul@sk.com>,
max.byungchul.park@gmail.com, Yeoreum Yun <yeoreum.yun@arm.com>,
Michelle Jin <shjy180909@gmail.com>,
linux-kernel@vger.kernel.org,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
Alan Stern <stern@rowland.harvard.edu>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
stable@vger.kernel.org, kasan-dev@googlegroups.com,
syzkaller@googlegroups.com, linux-usb@vger.kernel.org,
linux-rt-devel@lists.linux.dev,
Austin Kim <austindh.kim@gmail.com>
Subject: Re: [PATCH] kcov, usb: Fix invalid context sleep in softirq path on PREEMPT_RT
Date: Mon, 11 Aug 2025 10:31:35 +0200 [thread overview]
Message-ID: <20250811083135.xtl2wSQz@linutronix.de> (raw)
In-Reply-To: <ee26e7b2-80dd-49b1-bca2-61e460f73c2d@kzalloc.com>
On 2025-08-09 02:35:48 [+0900], Yunseong Kim wrote:
> Hi Sebastian,
Hi Yunseong,
> > Could someone maybe test this?
>
> As you requested, I have tested your patch on my setup.
>
> I can check that your patch resolves the issue. I have been running
> the syzkaller for several hours, and the "sleeping function called
> from invalid context" bug is no longer triggered.
Thank you. I just sent this as a proper patch assuming kcov still does
what it should. I just don't understand why this triggers after moving
to workqueues and did not with the tasklet setup. Other that than
workqueue code has a bit more overhead, it is the same thing.
> I really impressed your "How to Not Break PREEMPT_RT" talk at LPC 22.
Thank you.
>
> Tested-by: Yunseong Kim <ysk@kzalloc.com>
>
>
> Thanks,
>
> Yunseong Kim
Sebastian
prev parent reply other threads:[~2025-08-11 8:31 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-25 20:14 [PATCH] kcov, usb: Fix invalid context sleep in softirq path on PREEMPT_RT Yunseong Kim
2025-07-26 6:36 ` Greg Kroah-Hartman
2025-07-26 7:44 ` Tetsuo Handa
2025-07-26 7:59 ` Greg Kroah-Hartman
2025-07-26 11:59 ` Thomas Gleixner
2025-08-01 22:06 ` Yunseong Kim
2025-08-08 16:33 ` Sebastian Andrzej Siewior
2025-08-08 17:35 ` Yunseong Kim
2025-08-11 8:31 ` Sebastian Andrzej Siewior [this message]
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