Message-ID: <CAHiZj8hcN-OVsfB9f1fx_bTX561j_Af2rW4L3e0+hM9kptN3Yg@mail.gmail.com>
Date: Sat, 23 Nov 2024 12:48:11 +0530
From: Suraj Sonawane <surajsonawane0215@...il.com>
To: syzbot <syzbot+c92878e123785b1fa2db@...kaller.appspotmail.com>
Cc: iommu@...ts.linux.dev, jgg@...pe.ca, 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_device_unbind

#syz test

On Fri, Nov 22, 2024 at 1:47 PM syzbot <
syzbot+c92878e123785b1fa2db@...kaller.appspotmail.com> wrote:

> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    c6d64479d609 Merge tag 'pull-statx' of
> git://git.kernel.or..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=129a0ae8580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=b3b3b2f3eaae51f9
> dashboard link:
> https://syzkaller.appspot.com/bug?extid=c92878e123785b1fa2db
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for
> Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17da1bf7980000
>
> Downloadable assets:
> disk image:
> https://storage.googleapis.com/syzbot-assets/9d212f6bb1af/disk-c6d64479.raw.xz
> vmlinux:
> https://storage.googleapis.com/syzbot-assets/21a14342211b/vmlinux-c6d64479.xz
> kernel image:
> https://storage.googleapis.com/syzbot-assets/f96c41f3e4a6/bzImage-c6d64479.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the
> commit:
> Reported-by: syzbot+c92878e123785b1fa2db@...kaller.appspotmail.com
>
> iommufd: Time out waiting for iommufd object to become free
> ------------[ cut here ]------------
> WARNING: CPU: 1 PID: 6050 at drivers/iommu/iommufd/iommufd_private.h:208
> iommufd_object_destroy_user drivers/iommu/iommufd/iommufd_private.h:208
> [inline]
> WARNING: CPU: 1 PID: 6050 at drivers/iommu/iommufd/iommufd_private.h:208
> iommufd_device_unbind+0x81/0xa0 drivers/iommu/iommufd/device.c:280
> Modules linked in:
> CPU: 1 UID: 0 PID: 6050 Comm: syz.3.18 Not tainted
> 6.12.0-syzkaller-00239-gc6d64479d609 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 10/30/2024
> RIP: 0010:iommufd_object_destroy_user
> drivers/iommu/iommufd/iommufd_private.h:208 [inline]
> RIP: 0010:iommufd_device_unbind+0x81/0xa0
> drivers/iommu/iommufd/device.c:280
> Code: 00 e8 83 76 01 00 89 c3 31 ff 89 c6 e8 b8 85 43 fc 85 db 75 0f e8 6f
> 81 43 fc 5b 41 5e 41 5f c3 cc cc cc cc e8 60 81 43 fc 90 <0f> 0b 90 eb eb
> 89 f9 80 e1 07 80 c1 03 38 c1 7c b8 e8 d9 44 aa fc
> RSP: 0018:ffffc90003017c38 EFLAGS: 00010293
> RAX: ffffffff85516f50 RBX: 00000000fffffff0 RCX: ffff88802c693c00
> RDX: 0000000000000000 RSI: 00000000fffffff0 RDI: 0000000000000000
> RBP: ffffc90003017d70 R08: ffffffff85516f38 R09: 1ffff11005b9b140
> R10: dffffc0000000000 R11: ffffed1005b9b141 R12: ffff888034149718
> R13: ffff888034149700 R14: ffff888028d2c400 R15: dffffc0000000000
> FS:  00007f2573c136c0(0000) GS:ffff8880b8700000(0000)
> knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 000000c001633e80 CR3: 0000000032fda000 CR4: 00000000003526f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  <TASK>
>  iommufd_selftest_destroy+0x95/0xe0 drivers/iommu/iommufd/selftest.c:1439
>  iommufd_object_remove+0x3b6/0x530 drivers/iommu/iommufd/main.c:211
>  iommufd_fops_ioctl+0x4d6/0x5a0 drivers/iommu/iommufd/main.c:424
>  vfs_ioctl fs/ioctl.c:51 [inline]
>  __do_sys_ioctl fs/ioctl.c:906 [inline]
>  __se_sys_ioctl+0xf5/0x170 fs/ioctl.c:892
>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> RIP: 0033:0x7f2572d7e759
> Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007f2573c13038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 00007f2572f36058 RCX: 00007f2572d7e759
> RDX: 0000000020000400 RSI: 0000000000003b80 RDI: 0000000000000003
> RBP: 00007f2572df175e R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 0000000000000001 R14: 00007f2572f36058 R15: 00007ffefd725ea8
>  </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 syzkaller@...glegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the report is already addressed, 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 overwrite report's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the report is a duplicate of another one, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
>
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> .
>

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