linux-kernel - kernel panic: Fatal exception (3)

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Message-ID: <0000000000005c841705b1a7266a@google.com>
Date:   Wed, 14 Oct 2020 13:12:24 -0700
From:   syzbot <syzbot+ec762a6342ad0d3c0d8f@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: kernel panic: Fatal exception (3)

Hello,

syzbot found the following issue on:

HEAD commit:    c77fb07f Merge branch 'netlink-export-policy-on-validation..
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1722ff00500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fa2bf4058104211
dashboard link: https://syzkaller.appspot.com/bug?extid=ec762a6342ad0d3c0d8f
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1281459f900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=175556f0500000

Bisection is inconclusive: the issue happens on the oldest tested release.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11932b48500000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=13932b48500000
console output: https://syzkaller.appspot.com/x/log.txt?x=15932b48500000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ec762a6342ad0d3c0d8f@...kaller.appspotmail.com

FS:  0000000000000000(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004c9428 CR3: 0000000009e8d000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Kernel panic - not syncing: Fatal exception in interrupt
Kernel Offset: disabled
Rebooting in 86400 seconds..

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches