Re: general protection fault in security_inode_getattr

[Yonghong Song]

On 8/24/20 5:32 PM, syzbot wrote:
> syzbot has bisected this issue to:
>
> commit 35697c12d7ffd31a56d3c9604066a166b75d0169
> Author: Yonghong Song <yhs@xxxxxx>
> Date:   Thu Jan 16 17:40:04 2020 +0000
>
>      selftests/bpf: Fix test_progs send_signal flakiness with nmi mode

The above patch changed file:
    tools/testing/selftests/bpf/prog_tests/send_signal.c
It is unlikely it caused the issue.

> bisection log:  https://urldefense.proofpoint.com/v2/url?u=https-3A__syzkaller.appspot.com_x_bisect.txt-3Fx-3D13032139900000&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=Le6D_jfzkec28_qNhbUwMesaUeBGaKEG6RLN3ZCzE1s&e=
> start commit:   d012a719 Linux 5.9-rc2
> git tree:       upstream
> final oops:     https://urldefense.proofpoint.com/v2/url?u=https-3A__syzkaller.appspot.com_x_report.txt-3Fx-3D10832139900000&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=VbLXb22TgxAtiPQTEq0t5r0WgNDiFwstWKnme0tWBLE&e=
> console output: https://urldefense.proofpoint.com/v2/url?u=https-3A__syzkaller.appspot.com_x_log.txt-3Fx-3D17032139900000&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=yu72HnqjHzOTtJ5dyD7q0QW9sOwEO6pPHjeYTTutKdc&e=
> kernel config:  https://urldefense.proofpoint.com/v2/url?u=https-3A__syzkaller.appspot.com_x_.config-3Fx-3D891ca5711a9f1650&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=6cylIRBZjHQmgkJQoofuLN2XSifb-13qrrj58PQpBYs&e=
> dashboard link: https://urldefense.proofpoint.com/v2/url?u=https-3A__syzkaller.appspot.com_bug-3Fextid-3Df07cc9be8d1d226947ed&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=siCrm2aO-fzR3Nym_zaPQQnmxMlJo0bRj87zgm7o5mY&e=
> syz repro:      https://urldefense.proofpoint.com/v2/url?u=https-3A__syzkaller.appspot.com_x_repro.syz-3Fx-3D104a650e900000&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=yNEvyRe2bO4AKgq2UuJc32katp4k4UGKwMUDEBlhM7E&e=
>
> Reported-by: syzbot+f07cc9be8d1d226947ed@xxxxxxxxxxxxxxxxxxxxxxxxx
> Fixes: 35697c12d7ff ("selftests/bpf: Fix test_progs send_signal flakiness with nmi mode")
>
> For information about bisection process see: https://urldefense.proofpoint.com/v2/url?u=https-3A__goo.gl_tpsmEJ-23bisection&d=DwIBaQ&c=5VD0RTtNlTh3ycd41b3MUw&r=DA8e1B5r073vIqRrFz7MRA&m=854z77F3pbTpgGUCFUwM1OSEUj4NbiNIZsaad0Xg4qc&s=K4KdZK8rBgxDv4M9uwEndkCB4mCatTH-opwefN-0b-M&e=