Re: [syzbot] [kernel?] WARNING in irqentry_exit (2)

[Peter Zijlstra]

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@xxxxxxxxxxxxxxxxxxxxxxxxx
> 
> ------------[ 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@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

might fix.