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Message-ID: <20230530072310-mutt-send-email-mst@kernel.org>
Date: Tue, 30 May 2023 07:24:06 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: syzbot <syzbot+d0d442c22fa8db45ff0e@...kaller.appspotmail.com>
Cc: jasowang@...hat.com, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
syzkaller-bugs@...glegroups.com,
virtualization@...ts.linux-foundation.org,
Stefano Garzarella <sgarzare@...hat.com>, stefanha@...hat.com
Subject: Re: [syzbot] [kvm?] [net?] [virt?] general protection fault in
vhost_work_queue
On Tue, May 30, 2023 at 12:30:06AM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 933174ae28ba Merge tag 'spi-fix-v6.4-rc3' of git://git.ker..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=138d4ae5280000
> kernel config: https://syzkaller.appspot.com/x/.config?x=f389ffdf4e9ba3f0
> dashboard link: https://syzkaller.appspot.com/bug?extid=d0d442c22fa8db45ff0e
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/21a81b8c2660/disk-933174ae.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/b4951d89e238/vmlinux-933174ae.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/21eb405303cc/bzImage-933174ae.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+d0d442c22fa8db45ff0e@...kaller.appspotmail.com
>
> general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] PREEMPT SMP KASAN
> KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077]
> CPU: 0 PID: 29845 Comm: syz-executor.4 Not tainted 6.4.0-rc3-syzkaller-00032-g933174ae28ba #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/16/2023
> RIP: 0010:vhost_work_queue drivers/vhost/vhost.c:259 [inline]
> RIP: 0010:vhost_work_queue+0xfc/0x150 drivers/vhost/vhost.c:248
> Code: 00 00 fc ff df 48 89 da 48 c1 ea 03 80 3c 02 00 75 56 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 8d 7b 70 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 42 48 8b 7b 70 e8 95 9e ae f9 5b 5d 41 5c 41 5d e9
> RSP: 0018:ffffc9000333faf8 EFLAGS: 00010202
> RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000d84d000
> RDX: 000000000000000e RSI: ffffffff841221d7 RDI: 0000000000000070
> RBP: ffff88804b6b95b0 R08: 0000000000000001 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000000 R12: ffff88804b6b00b0
> R13: 0000000000000000 R14: ffff88804b6b95e0 R15: ffff88804b6b95c8
> FS: 00007f3b445ec700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000001b2e423000 CR3: 000000005d734000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Call Trace:
> <TASK>
> vhost_transport_send_pkt+0x268/0x520 drivers/vhost/vsock.c:288
> virtio_transport_send_pkt_info+0x54c/0x820 net/vmw_vsock/virtio_transport_common.c:250
> virtio_transport_connect+0xb1/0xf0 net/vmw_vsock/virtio_transport_common.c:813
> vsock_connect+0x37f/0xcd0 net/vmw_vsock/af_vsock.c:1414
> __sys_connect_file+0x153/0x1a0 net/socket.c:2003
> __sys_connect+0x165/0x1a0 net/socket.c:2020
> __do_sys_connect net/socket.c:2030 [inline]
> __se_sys_connect net/socket.c:2027 [inline]
> __x64_sys_connect+0x73/0xb0 net/socket.c:2027
> 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: 0033:0x7f3b4388c169
> Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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:00007f3b445ec168 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
> RAX: ffffffffffffffda RBX: 00007f3b439ac050 RCX: 00007f3b4388c169
> RDX: 0000000000000010 RSI: 0000000020000140 RDI: 0000000000000004
> RBP: 00007f3b438e7ca1 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
> R13: 00007f3b43acfb1f R14: 00007f3b445ec300 R15: 0000000000022000
> </TASK>
> Modules linked in:
> ---[ end trace 0000000000000000 ]---
> RIP: 0010:vhost_work_queue drivers/vhost/vhost.c:259 [inline]
> RIP: 0010:vhost_work_queue+0xfc/0x150 drivers/vhost/vhost.c:248
> Code: 00 00 fc ff df 48 89 da 48 c1 ea 03 80 3c 02 00 75 56 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 8d 7b 70 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 42 48 8b 7b 70 e8 95 9e ae f9 5b 5d 41 5c 41 5d e9
> RSP: 0018:ffffc9000333faf8 EFLAGS: 00010202
> RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc9000d84d000
> RDX: 000000000000000e RSI: ffffffff841221d7 RDI: 0000000000000070
> RBP: ffff88804b6b95b0 R08: 0000000000000001 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000000 R12: ffff88804b6b00b0
> R13: 0000000000000000 R14: ffff88804b6b95e0 R15: ffff88804b6b95c8
> FS: 00007f3b445ec700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000001b2e428000 CR3: 000000005d734000 CR4: 00000000003506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 000000000000003b DR6: 00000000ffff0ff0 DR7: 0000000000000400
> ----------------
> Code disassembly (best guess), 5 bytes skipped:
> 0: 48 89 da mov %rbx,%rdx
> 3: 48 c1 ea 03 shr $0x3,%rdx
> 7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
> b: 75 56 jne 0x63
> d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
> 14: fc ff df
> 17: 48 8b 1b mov (%rbx),%rbx
> 1a: 48 8d 7b 70 lea 0x70(%rbx),%rdi
> 1e: 48 89 fa mov %rdi,%rdx
> 21: 48 c1 ea 03 shr $0x3,%rdx
> * 25: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
> 29: 75 42 jne 0x6d
> 2b: 48 8b 7b 70 mov 0x70(%rbx),%rdi
> 2f: e8 95 9e ae f9 callq 0xf9ae9ec9
> 34: 5b pop %rbx
> 35: 5d pop %rbp
> 36: 41 5c pop %r12
> 38: 41 5d pop %r13
> 3a: e9 .byte 0xe9
Stefano, Stefan, take a look?
>
> ---
> 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 bug is already fixed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> 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
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