Hi Bobby, can you take a look at this report? It seems related to the changes we made to support skbuff. Thanks, Stefano On Fri, Mar 24, 2023 at 1:52 AM syzbot <syzbot+befff0a9536049e7902e@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: fff5a5e7f528 Merge tag 'for-linus' of git://git.armlinux.o.. > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=1136e97ac80000 > kernel config: https://syzkaller.appspot.com/x/.config?x=aaa4b45720ca0519 > dashboard link: https://syzkaller.appspot.com/bug?extid=befff0a9536049e7902e > 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=14365781c80000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12eebc66c80000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/997791f5f9e1/disk-fff5a5e7.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/0b0155b5eac1/vmlinux-fff5a5e7.xz > kernel image: https://storage.googleapis.com/syzbot-assets/8d98dd2ba6b6/bzImage-fff5a5e7.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+befff0a9536049e7902e@xxxxxxxxxxxxxxxxxxxxxxxxx > > general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN > KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] > CPU: 0 PID: 8759 Comm: syz-executor379 Not tainted 6.3.0-rc3-syzkaller-00026-gfff5a5e7f528 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 > RIP: 0010:virtio_transport_purge_skbs+0x139/0x4c0 net/vmw_vsock/virtio_transport_common.c:1370 > Code: 00 00 00 00 fc ff df 48 89 c2 48 89 44 24 28 48 c1 ea 03 48 8d 04 1a 48 89 44 24 10 eb 29 e8 ee 27 a3 f7 48 89 e8 48 c1 e8 03 <80> 3c 18 00 0f 85 a6 02 00 00 49 39 ec 48 8b 55 00 49 89 ef 0f 84 > RSP: 0018:ffffc90006427b48 EFLAGS: 00010256 > RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 > RDX: ffff8880211157c0 RSI: ffffffff89dfbd12 RDI: ffff88802c11a018 > RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003 > R10: fffff52000c84f5b R11: 0000000000000000 R12: ffffffff92179188 > R13: ffffc90006427ba0 R14: ffff88801e0f1100 R15: ffff88802c11a000 > FS: 00007f01fdd51700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f01fdd30718 CR3: 000000002a3f9000 CR4: 0000000000350ef0 > Call Trace: > <TASK> > vsock_loopback_cancel_pkt+0x1c/0x20 net/vmw_vsock/vsock_loopback.c:48 > vsock_transport_cancel_pkt net/vmw_vsock/af_vsock.c:1284 [inline] > vsock_connect+0x852/0xcc0 net/vmw_vsock/af_vsock.c:1426 > __sys_connect_file+0x153/0x1a0 net/socket.c:2001 > __sys_connect+0x165/0x1a0 net/socket.c:2018 > __do_sys_connect net/socket.c:2028 [inline] > __se_sys_connect net/socket.c:2025 [inline] > __x64_sys_connect+0x73/0xb0 net/socket.c:2025 > 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: 0033:0x7f01fdda0159 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 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:00007f01fdd51308 EFLAGS: 00000246 ORIG_RAX: 000000000000002a > RAX: ffffffffffffffda RBX: 00007f01fde28428 RCX: 00007f01fdda0159 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 > RBP: 00007f01fde28420 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f01fddf606c > R13: 0000000000000000 R14: 00007f01fdd51400 R15: 0000000000022000 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:virtio_transport_purge_skbs+0x139/0x4c0 net/vmw_vsock/virtio_transport_common.c:1370 > Code: 00 00 00 00 fc ff df 48 89 c2 48 89 44 24 28 48 c1 ea 03 48 8d 04 1a 48 89 44 24 10 eb 29 e8 ee 27 a3 f7 48 89 e8 48 c1 e8 03 <80> 3c 18 00 0f 85 a6 02 00 00 49 39 ec 48 8b 55 00 49 89 ef 0f 84 > RSP: 0018:ffffc90006427b48 EFLAGS: 00010256 > RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 > RDX: ffff8880211157c0 RSI: ffffffff89dfbd12 RDI: ffff88802c11a018 > RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000003 > R10: fffff52000c84f5b R11: 0000000000000000 R12: ffffffff92179188 > R13: ffffc90006427ba0 R14: ffff88801e0f1100 R15: ffff88802c11a000 > FS: 00007f01fdd51700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f01fdd30718 CR3: 000000002a3f9000 CR4: 0000000000350ef0 > ---------------- > Code disassembly (best guess), 6 bytes skipped: > 0: df 48 89 fisttps -0x77(%rax) > 3: c2 48 89 retq $0x8948 > 6: 44 24 28 rex.R and $0x28,%al > 9: 48 c1 ea 03 shr $0x3,%rdx > d: 48 8d 04 1a lea (%rdx,%rbx,1),%rax > 11: 48 89 44 24 10 mov %rax,0x10(%rsp) > 16: eb 29 jmp 0x41 > 18: e8 ee 27 a3 f7 callq 0xf7a3280b > 1d: 48 89 e8 mov %rbp,%rax > 20: 48 c1 e8 03 shr $0x3,%rax > * 24: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction > 28: 0f 85 a6 02 00 00 jne 0x2d4 > 2e: 49 39 ec cmp %rbp,%r12 > 31: 48 8b 55 00 mov 0x0(%rbp),%rdx > 35: 49 89 ef mov %rbp,%r15 > 38: 0f .byte 0xf > 39: 84 .byte 0x84 > > > --- > 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@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches >
