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Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.99.2 #2 (Red Hat Linux)) id 1wrUvA-0000000AUY5-0khl; Wed, 05 Aug 2026 06:16:08 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 6D78C3004C9; Wed, 05 Aug 2026 08:16:07 +0200 (CEST) Date: Wed, 5 Aug 2026 08:16:07 +0200 From: Peter Zijlstra To: syzbot Cc: linux-kernel@vger.kernel.org, luto@kernel.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Subject: Re: [syzbot] [kernel?] WARNING in irqentry_exit (2) Message-ID: <20260805061607.GM776954@noisy.programming.kicks-ass.net> References: <6a728030.9511d2ce.1fc5b9.035f.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6a728030.9511d2ce.1fc5b9.035f.GAE@google.com> On Tue, Aug 04, 2026 at 05:13:36PM -0700, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 3708dd948844 Merge tag 'pm-7.2-rc6' of git://git.kernel.or.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=17973632580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f221a1b5d497ed15 > dashboard link: https://syzkaller.appspot.com/bug?extid=93cc6b9a8a81c9e47978 > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/244376930b41/disk-3708dd94.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/6a4fdb2a8dcf/vmlinux-3708dd94.xz > kernel image: https://storage.googleapis.com/syzbot-assets/6d326f1f8ed8/bzImage-3708dd94.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+93cc6b9a8a81c9e47978@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > __lockdep_enabled && this_cpu_read(hardirqs_enabled) > WARNING: ./include/linux/hrtimer_rearm.h:17 at hrtimer_test_and_clear_rearm_deferred_tif include/linux/hrtimer_rearm.h:17 [inline], CPU#0: syz.2.3762/30761 > WARNING: ./include/linux/hrtimer_rearm.h:17 at hrtimer_rearm_deferred_tif include/linux/hrtimer_rearm.h:52 [inline], CPU#0: syz.2.3762/30761 > WARNING: ./include/linux/hrtimer_rearm.h:17 at rseq_grant_slice_extension include/linux/rseq_entry.h:236 [inline], CPU#0: syz.2.3762/30761 > WARNING: ./include/linux/hrtimer_rearm.h:17 at __exit_to_user_mode_loop kernel/entry/common.c:54 [inline], CPU#0: syz.2.3762/30761 > WARNING: ./include/linux/hrtimer_rearm.h:17 at exit_to_user_mode_loop kernel/entry/common.c:101 [inline], CPU#0: syz.2.3762/30761 > WARNING: ./include/linux/hrtimer_rearm.h:17 at __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline], CPU#0: syz.2.3762/30761 > WARNING: ./include/linux/hrtimer_rearm.h:17 at irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline], CPU#0: syz.2.3762/30761 > WARNING: ./include/linux/hrtimer_rearm.h:17 at irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline], CPU#0: syz.2.3762/30761 I'm thinking this: https://lore.kernel.org/r/20260803071940.GX49951@noisy.programming.kicks-ass.net might fix.