------------[ cut here ]------------ 'send_pkt()' returns 0, but 65536 expected WARNING: CPU: 1 PID: 489 at net/vmw_vsock/virtio_transport_common.c:428 virtio_transport_send_pkt_info+0xe85/0x10c0 net/vmw_vsock/virtio_transport_common.c:426 Modules linked in: CPU: 1 UID: 0 PID: 489 Comm: syz.2.17 Not tainted 6.16.0-syzkaller-12256-g561c80369df0 #0 PREEMPT 5f5e7954c04d976def8dc191ae666c78f339111f Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:virtio_transport_send_pkt_info+0xe85/0x10c0 net/vmw_vsock/virtio_transport_common.c:426 Code: a1 14 fc 0f 0b bb f2 ff ff ff eb b5 e8 54 a1 14 fc c6 05 8b 84 31 02 01 48 c7 c7 20 44 79 86 44 89 f6 4c 89 e2 e8 1b 7d 94 fb <0f> 0b e9 de fe ff ff e8 2f a1 14 fc 0f 0b e9 c2 f6 ff ff 89 d9 80 RSP: 0018:ffffc9000108f550 EFLAGS: 00010246 RAX: 782be1e1ea237900 RBX: ffffffff87bea0f0 RCX: ffff88810bbb6780 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002 RBP: ffffc9000108f630 R08: ffffc9000108f267 R09: 1ffff92000211e4c R10: dffffc0000000000 R11: fffff52000211e4d R12: 0000000000010000 R13: 0000000000010000 R14: 0000000000000000 R15: ffffc9000108f680 FS: 00007f8c047f96c0(0000) GS:ffff88826e691000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000003f000 CR3: 0000000133ff0000 CR4: 00000000003526b0 Call Trace: virtio_transport_stream_enqueue net/vmw_vsock/virtio_transport_common.c:1111 [inline] virtio_transport_seqpacket_enqueue+0x140/0x1c0 net/vmw_vsock/virtio_transport_common.c:839 vsock_connectible_sendmsg+0xb19/0x10b0 net/vmw_vsock/af_vsock.c:2140 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg net/socket.c:729 [inline] ____sys_sendmsg+0xa57/0xac0 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmmsg+0x247/0x400 net/socket.c:2757 __do_sys_sendmmsg net/socket.c:2784 [inline] __se_sys_sendmmsg net/socket.c:2781 [inline] __x64_sys_sendmmsg+0xa4/0xc0 net/socket.c:2781 x64_sys_call+0x1c6b/0x2fd0 arch/x86/include/generated/asm/syscalls_64.h:308 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x62/0x160 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f8c0398ebe9 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:00007f8c047f9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f8c03bb5fa0 RCX: 00007f8c0398ebe9 RDX: 0000000000000001 RSI: 0000200000000100 RDI: 0000000000000004 RBP: 00007f8c03a11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000024008094 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8c03bb6038 R14: 00007f8c03bb5fa0 R15: 00007ffe7a541468 ---[ end trace 0000000000000000 ]---