'send_pkt()' returns 0, but 4096 expected
WARNING: net/vmw_vsock/virtio_transport_common.c:432 at virtio_transport_send_pkt_info+0x93b/0x1010 net/vmw_vsock/virtio_transport_common.c:432, CPU#3: syz.0.17/5921
Modules linked in:
CPU: 3 UID: 0 PID: 5921 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:virtio_transport_send_pkt_info+0x943/0x1010 net/vmw_vsock/virtio_transport_common.c:432
Code: 00 00 48 8b 44 24 28 8b 80 94 05 00 00 89 44 24 30 e9 c6 f8 ff ff e8 3c 5b 9f f6 48 8d 3d 65 dd 7f 05 48 8b 54 24 10 44 89 ee <67> 48 0f b9 3a e8 23 5b 9f f6 31 ff 44 89 fe e8 c9 55 9f f6 45 85
RSP: 0018:ffffc900074cf708 EFLAGS: 00010293
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff8b692ef8
RDX: 0000000000001000 RSI: 0000000000000000 RDI: ffffffff90e90dd0
RBP: ffff88802688d000 R08: 0000000000000006 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000003 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000001000 R15: 0000000000001000
FS: 00005555658bb500(0000) GS:ffff8880d6679000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000030000 CR3: 000000002dade000 CR4: 0000000000352ef0
Call Trace:
<TASK>
virtio_transport_stream_enqueue net/vmw_vsock/virtio_transport_common.c:1125 [inline]
virtio_transport_seqpacket_enqueue+0x1a0/0x230 net/vmw_vsock/virtio_transport_common.c:852
vsock_connectible_sendmsg+0x1006/0x12b0 net/vmw_vsock/af_vsock.c:2278
sock_sendmsg_nosec net/socket.c:787 [inline]
__sock_sendmsg net/socket.c:802 [inline]
____sys_sendmsg+0x9e1/0xb70 net/socket.c:2698
___sys_sendmsg+0x190/0x1e0 net/socket.c:2752
__sys_sendmmsg+0x205/0x430 net/socket.c:2841
__do_sys_sendmmsg net/socket.c:2868 [inline]
__se_sys_sendmmsg net/socket.c:2865 [inline]
__x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2865
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5859d9cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffeabbe48b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f585a015fa0 RCX: 00007f5859d9cdd9
RDX: 0000000000000001 RSI: 0000200000000100 RDI: 0000000000000004
RBP: 00007f5859e32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000024008094 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f585a015fac R14: 00007f585a015fa0 R15: 00007f585a015fa0
</TASK>
----------------
Code disassembly (best guess):
0: 00 00 add %al,(%rax)
2: 48 8b 44 24 28 mov 0x28(%rsp),%rax
7: 8b 80 94 05 00 00 mov 0x594(%rax),%eax
d: 89 44 24 30 mov %eax,0x30(%rsp)
11: e9 c6 f8 ff ff jmp 0xfffff8dc
16: e8 3c 5b 9f f6 call 0xf69f5b57
1b: 48 8d 3d 65 dd 7f 05 lea 0x57fdd65(%rip),%rdi # 0x57fdd87
22: 48 8b 54 24 10 mov 0x10(%rsp),%rdx
27: 44 89 ee mov %r13d,%esi
* 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction
2f: e8 23 5b 9f f6 call 0xf69f5b57
34: 31 ff xor %edi,%edi
36: 44 89 fe mov %r15d,%esi
39: e8 c9 55 9f f6 call 0xf69f5607
3e: 45 rex.RB
3f: 85 .byte 0x85