linux-kernel - kernel panic: stack is corrupted in get_kernel_gp

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Message-ID: <000000000000bb202905af132b8f@google.com>
Date:   Fri, 11 Sep 2020 17:49:16 -0700
From:   syzbot <syzbot+d6459d8f8984c0929e54@...kaller.appspotmail.com>
To:     alexandre.chartre@...cle.com, bp@...en8.de, hpa@...or.com,
        linux-kernel@...r.kernel.org, luto@...nel.org, mingo@...hat.com,
        peterz@...radead.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, x86@...nel.org
Subject: kernel panic: stack is corrupted in get_kernel_gp_address

Hello,

syzbot found the following issue on:

HEAD commit:    f4d51dff Linux 5.9-rc4
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14aa2d3e900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a9075b36a6ae26c9
dashboard link: https://syzkaller.appspot.com/bug?extid=d6459d8f8984c0929e54
compiler:       gcc (GCC) 10.1.0-syz 20200507
userspace arch: i386
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=164270dd900000

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

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13c7d9f9900000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=1027d9f9900000
console output: https://syzkaller.appspot.com/x/log.txt?x=17c7d9f9900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+d6459d8f8984c0929e54@...kaller.appspotmail.com

���ACode: Bad RIP value.
Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: get_kernel_gp_address+0x1a0/0x1c0 arch/x86/kernel/traps.c:520
Kernel Offset: disabled


---
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