linux-kernel - Re: [syzbot] [iommu?] WARNING in iommufd_access

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Date:   Sat, 15 Jul 2023 19:57:23 -0700
From:   syzbot <syzbot+7574ebfe589049630608@...kaller.appspotmail.com>
To:     alex.williamson@...hat.com, iommu@...ts.linux.dev, jgg@...dia.com,
        jgg@...pe.ca, joro@...tes.org, kevin.tian@...el.com,
        linux-kernel@...r.kernel.org, nicolinc@...dia.com,
        robin.murphy@....com, syzkaller-bugs@...glegroups.com,
        terrence.xu@...el.com, will@...nel.org, yi.l.liu@...el.com
Subject: Re: [syzbot] [iommu?] WARNING in iommufd_access_destroy

syzbot has bisected this issue to:

commit 54b47585db6658a5eb898d4d45be18d1e581c1bf
Author: Nicolin Chen <nicolinc@...dia.com>
Date:   Mon Mar 27 09:33:47 2023 +0000

    iommufd: Create access in vfio_iommufd_emulated_bind()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=16549b42a80000
start commit:   b6e6cc1f78c7 Merge tag 'x86_urgent_for_6.5_rc2' of git://g..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=15549b42a80000
console output: https://syzkaller.appspot.com/x/log.txt?x=11549b42a80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=6769a69bd0e144b4
dashboard link: https://syzkaller.appspot.com/bug?extid=7574ebfe589049630608
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=123562dca80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15825e1aa80000

Reported-by: syzbot+7574ebfe589049630608@...kaller.appspotmail.com
Fixes: 54b47585db66 ("iommufd: Create access in vfio_iommufd_emulated_bind()")

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