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SubjectRe: BUG: using smp_processor_id() in preemptible code in radix_tree_node_alloc
From
syzbot has bisected this bug to:

commit e42671084361302141a09284fde9bbc14fdd16bf
Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Date: Thu May 7 12:53:06 2020 +0000

net: qrtr: Do not depend on ARCH_QCOM

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=17e22212100000
start commit: acf25aa6 Merge tag 'Smack-for-5.8' of git://github.com/csc..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=14122212100000
console output: https://syzkaller.appspot.com/x/log.txt?x=10122212100000
kernel config: https://syzkaller.appspot.com/x/.config?x=5263d9b5bce03c67
dashboard link: https://syzkaller.appspot.com/bug?extid=3eec59e770685e3dc879
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15bd4c1e100000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1520c9de100000

Reported-by: syzbot+3eec59e770685e3dc879@syzkaller.appspotmail.com
Fixes: e42671084361 ("net: qrtr: Do not depend on ARCH_QCOM")

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

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