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From: Thomas Gleixner <tglx@kernel.org>
To: Zijing Yin <yzjaurora@gmail.com>,
	Anna-Maria Behnsen <anna-maria@linutronix.de>,
	Frederic Weisbecker <frederic@kernel.org>
Cc: Zijing Yin <yzjaurora@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: UBSAN: invalid-load in __remove_hrtimer
Date: Thu, 04 Jun 2026 21:29:58 +0200	[thread overview]
Message-ID: <87qzmm3xzd.ffs@fw13> (raw)
In-Reply-To: <20260604171043.995130-1-yzjaurora@gmail.com>

On Thu, Jun 04 2026 at 10:10, Zijing Yin wrote:
> Fuzzing v7.1-rc1 (98878ed91b68) with a customized syzkaller on a
> KASAN+UBSAN build, I hit the UBSAN invalid-load below in

Please validate that this still is the case with the latest v7.1-rc6 or
ideally with the head of Linus tree.

> UBSAN: invalid-load in kernel/time/hrtimer.c:1147:14
> load of value 255 is not a valid value for type 'bool' (aka '_Bool')

That's memory corruption from some unknown place unrelated to the
hrtimer subsystem, which acts only as the messenger. 

Which becomes obvious due to this:

> Oops: general protection fault, probably for non-canonical address 0xf1a7c288031699ea: 0000 [#1] KASAN NOPTI

Thanks,

        tglx

      reply	other threads:[~2026-06-04 19:30 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-06-04 17:10 UBSAN: invalid-load in __remove_hrtimer Zijing Yin
2026-06-04 19:29 ` Thomas Gleixner [this message]

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