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

commit 0a9a25ca78437b39e691bcc3dc8240455b803d8d
Author: Ming Lei <ming.lei@redhat.com>
Date: Fri Mar 18 13:01:43 2022 +0000

block: let blkcg_gq grab request queue's refcnt

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=16c3cfc2080000
start commit: cb71b93c2dc3 Add linux-next specific files for 20220628
git tree: linux-next
final oops: https://syzkaller.appspot.com/x/report.txt?x=15c3cfc2080000
console output: https://syzkaller.appspot.com/x/log.txt?x=11c3cfc2080000
kernel config: https://syzkaller.appspot.com/x/.config?x=badbc1adb2d582eb
dashboard link: https://syzkaller.appspot.com/bug?extid=934ebb67352c8a490bf3
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=17713dee080000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15d24952080000

Reported-by: syzbot+934ebb67352c8a490bf3@syzkaller.appspotmail.com
Fixes: 0a9a25ca7843 ("block: let blkcg_gq grab request queue's refcnt")

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

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