[syzbot] [iommu?] WARNING in iommufd_access_destroy

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 06c2afb862f9 Linux 6.5-rc1
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1310ded8a80000
kernel config: https://syzkaller.appspot.com/x/.config?x=e75667d82b529c4f
dashboard link: https://syzkaller.appspot.com/bug?extid=7574ebfe589049630608
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=12150d5aa80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13164474a80000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-06c2afb8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e5107fc9d7e9/vmlinux-06c2afb8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/1c34d4df7975/bzImage-06c2afb8.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7574eb...@syzkaller.appspotmail.com

------------[ cut here ]------------
WARNING: CPU: 2 PID: 5730 at drivers/iommu/iommufd/device.c:462 iommufd_access_destroy+0x55/0x70 drivers/iommu/iommufd/device.c:462
Modules linked in:
CPU: 2 PID: 5730 Comm: syz-executor207 Not tainted 6.5.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:iommufd_access_destroy+0x55/0x70 drivers/iommu/iommufd/device.c:462
Code: 48 8b bd a8 00 00 00 48 89 ee e8 26 f1 00 00 31 ff 89 c5 89 c6 e8 1b 37 ec fc 40 84 ed 74 06 5d e9 30 3b ec fc e8 2b 3b ec fc <0f> 0b 5d e9 23 3b ec fc e8 3e 7b 3e fd eb c7 66 66 2e 0f 1f 84 00
RSP: 0018:ffffc90003bd7cc8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffc90003bd7e50 RCX: 0000000000000000
RDX: ffff888023385840 RSI: ffffffff8497c765 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000004
R13: ffff88802a1a8000 R14: ffffc90003bd7e10 R15: 00000000fffffffe
FS: 00007f57a46fc700(0000) GS:ffff88806b800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f57a47c0ba8 CR3: 000000001d1bd000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
iommufd_test_create_access drivers/iommu/iommufd/selftest.c:743 [inline]
iommufd_test+0x1506/0x2c30 drivers/iommu/iommufd/selftest.c:961
iommufd_fops_ioctl+0x317/0x4b0 drivers/iommu/iommufd/main.c:337
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x19d/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f57a476b989
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f57a46fc308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f57a476b989
RDX: 0000000020000080 RSI: 0000000000003ba0 RDI: 0000000000000003
RBP: 00007f57a47f3418 R08: 00007f57a46fc700 R09: 0000000000000000
R10: 00007f57a46fc700 R11: 0000000000000246 R12: 00007ffd6af68f3e
R13: 00007f57a47f3410 R14: 6d6f692f7665642f R15: 0000000000022000
</TASK>


---
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 syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

[syzbot]

syzbot has bisected this issue to:

commit 54b47585db6658a5eb898d4d45be18d1e581c1bf
Author: Nicolin Chen <nico...@nvidia.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+7574eb...@syzkaller.appspotmail.com
Fixes: 54b47585db66 ("iommufd: Create access in vfio_iommufd_emulated_bind()")

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