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

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Message-ID: <ZJCDZEdL82Wal1XP@nvidia.com>
Date:   Mon, 19 Jun 2023 13:33:40 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     syzbot <syzbot+94646b0ed2dcbb1f9c2f@...kaller.appspotmail.com>
Cc:     iommu@...ts.linux.dev, joro@...tes.org, kevin.tian@...el.com,
        linux-kernel@...r.kernel.org, robin.murphy@....com,
        syzkaller-bugs@...glegroups.com, will@...nel.org
Subject: Re: [syzbot] [iommu?] WARNING in iommufd_test

On Mon, May 01, 2023 at 10:05:05AM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    58390c8ce1bd Merge tag 'iommu-updates-v6.4' of git://git.k..
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=171c01f8280000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d56ffc213bf6bf4a
> dashboard link: https://syzkaller.appspot.com/bug?extid=94646b0ed2dcbb1f9c2f
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16310d5fc80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=168c5330280000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/51c43e265c8a/disk-58390c8c.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/7c64f4eeaf4d/vmlinux-58390c8c.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/e5d8f49c4804/bzImage-58390c8c.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+94646b0ed2dcbb1f9c2f@...kaller.appspotmail.com
> 
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 5005 at drivers/iommu/iommufd/selftest.c:762 iommufd_test_check_pages drivers/iommu/iommufd/selftest.c:762 [inline]
> WARNING: CPU: 1 PID: 5005 at drivers/iommu/iommufd/selftest.c:762 iommufd_test_access_pages drivers/iommu/iommufd/selftest.c:831 [inline]
> WARNING: CPU: 1 PID: 5005 at drivers/iommu/iommufd/selftest.c:762 iommufd_test+0x1bed/0x2c20 drivers/iommu/iommufd/selftest.c:964

#syz dup: WARNING in iommufd_test_check_pages