linux-kernel - Re: BUG: unable to handle kernel paging request in pcpu

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Message-ID: <000000000000ad595a0598e417a6@google.com>
Date:   Wed, 04 Dec 2019 09:25:00 -0800
From:   syzbot <syzbot+82e323920b78d54aaed5@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, andriin@...com, aryabinin@...tuozzo.com,
        ast@...nel.org, bpf@...r.kernel.org, christophe.leroy@....fr,
        daniel@...earbox.net, dja@...ens.net, dvyukov@...gle.com,
        glider@...gle.com, gor@...ux.ibm.com, kafai@...com,
        kasan-dev@...glegroups.com, linux-kernel@...r.kernel.org,
        mark.rutland@....com, netdev@...r.kernel.org,
        songliubraving@...com, syzkaller-bugs@...glegroups.com,
        torvalds@...ux-foundation.org, yhs@...com
Subject: Re: BUG: unable to handle kernel paging request in pcpu_alloc

syzbot has bisected this bug to:

commit 0609ae011deb41c9629b7f5fd626dfa1ac9d16b0
Author: Daniel Axtens <dja@...ens.net>
Date:   Sun Dec 1 01:55:00 2019 +0000

     x86/kasan: support KASAN_VMALLOC

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=166cf97ee00000
start commit:   1ab75b2e Add linux-next specific files for 20191203
git tree:       linux-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=156cf97ee00000
console output: https://syzkaller.appspot.com/x/log.txt?x=116cf97ee00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=de1505c727f0ec20
dashboard link: https://syzkaller.appspot.com/bug?extid=82e323920b78d54aaed5
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=156ef061e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11641edae00000

Reported-by: syzbot+82e323920b78d54aaed5@...kaller.appspotmail.com
Fixes: 0609ae011deb ("x86/kasan: support KASAN_VMALLOC")

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