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SubjectRe: [syzbot] possible deadlock in wake_up_all_idle_cpus
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syzbot has bisected this issue to:

commit 8850cb663b5cda04d33f9cfbc38889d73d3c8e24
Author: Peter Zijlstra <peterz@infradead.org>
Date: Tue Sep 21 20:16:02 2021 +0000

sched: Simplify wake_up_*idle*()

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=117802fb300000
start commit: 7c832d2f9b95 Add linux-next specific files for 20211015
git tree: linux-next
final oops: https://syzkaller.appspot.com/x/report.txt?x=137802fb300000
console output: https://syzkaller.appspot.com/x/log.txt?x=157802fb300000
kernel config: https://syzkaller.appspot.com/x/.config?x=f6ac42766a768877
dashboard link: https://syzkaller.appspot.com/bug?extid=d5b23b18d2f4feae8a67
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14e920fcb00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13b83d80b00000

Reported-by: syzbot+d5b23b18d2f4feae8a67@syzkaller.appspotmail.com
Fixes: 8850cb663b5c ("sched: Simplify wake_up_*idle*()")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

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