syzbot

panic: IPv6 payload too large: 65537, must be <= 65535

goroutine 1086 [running]:
panic(0xfd0f00, 0xc0008d2100)
	GOROOT/src/runtime/panic.go:1064 +0x470 fp=0xc0008c9e00 sp=0xc0008c9d48 pc=0x437030
gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).addIPHeader(0xc0000d2000, 0xc00045a370, 0x10, 0xc00045a370, 0x10, 0xc00052a000, 0x4000000011, 0x0, 0x0, 0x0)
	pkg/tcpip/network/ipv6/ipv6.go:547 +0x2b7 fp=0xc0008c9ed0 sp=0xc0008c9e00 pc=0xb08d17
gvisor.dev/gvisor/pkg/tcpip/network/ipv6.(*endpoint).WritePacket(0xc0000d2000, 0xc0000f2f20, 0x0, 0x4000000011, 0xc00052a000, 0x56)
	pkg/tcpip/network/ipv6/ipv6.go:612 +0xaf fp=0xc0008ca310 sp=0xc0008c9ed0 pc=0xb090cf
gvisor.dev/gvisor/pkg/tcpip/stack.(*Route).WritePacket(0xc0000f2f20, 0x0, 0x4000000011, 0xc00052a000, 0x8)
	pkg/tcpip/stack/route.go:410 +0xb7 fp=0xc0008ca350 sp=0xc0008ca310 pc=0x936dd7
gvisor.dev/gvisor/pkg/tcpip/transport/udp.sendUDP(0xc0000f2f20, 0xc00021e980, 0x1, 0x1, 0xfff9, 0x1004e218fd3, 0x1303120, 0xc0001f6000, 0xc000000000, 0x0)
	pkg/tcpip/transport/udp/endpoint.go:898 +0x43b fp=0xc0008cb358 sp=0xc0008ca350 pc=0xaeb49b
gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).write(0xc000268000, 0x1305d20, 0xc000890320, 0xc00021e940, 0x0, 0x0, 0x0, 0x0)
	pkg/tcpip/transport/udp/endpoint.go:563 +0x5ea fp=0xc0008cb4d8 sp=0xc0008cb358 pc=0xae94ea
gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).Write(0xc000268000, 0x1305d20, 0xc000890320, 0xc00021e940, 0xc000000000, 0x10, 0x884e21, 0xc00040000a)
	pkg/tcpip/transport/udp/endpoint.go:407 +0x68 fp=0xc0008cb528 sp=0xc0008cb4d8 pc=0xae8da8
gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*socketOpsCommon).SendMsg(0xc0004e8070, 0xc0001f6000, 0x1320cc0, 0xc0008e7000, 0xc0000de380, 0x8, 0x0, 0xfff9, 0x100, 0xc00040a080, ...)
	pkg/sentry/socket/netstack/netstack.go:2983 +0x19d fp=0xc0008cb818 sp=0xc0008cb528 pc=0xb2ed3d
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.sendSingleMsg(0xc0001f6000, 0x3f2a44622160, 0xc0004e8000, 0xc0004e8000, 0x20000040, 0xc000000000, 0xfff, 0x10001ff0000, 0x807a78)
	pkg/sentry/syscalls/linux/vfs2/socket.go:1051 +0x3c2 fp=0xc0008cba58 sp=0xc0008cb818 pc=0xda3cc2
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.SendMsg(0xc0001f6000, 0x3, 0x20000040, 0x0, 0x4, 0x1, 0x1, 0x0, 0x0, 0x0, ...)
	pkg/sentry/syscalls/linux/vfs2/socket.go:929 +0x225 fp=0xc0008cbaf8 sp=0xc0008cba58 pc=0xda30c5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc0001f6000, 0x2e, 0x3, 0x20000040, 0x0, 0x4, 0x1, 0x1, 0xddd397, 0x11a7a20, ...)
	pkg/sentry/kernel/task_syscall.go:104 +0x13c fp=0xc0008cbc58 sp=0xc0008cbaf8 pc=0x9d273c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc0001f6000, 0x2e, 0x3, 0x20000040, 0x0, 0x4, 0x1, 0x1, 0x1, 0x1)
	pkg/sentry/kernel/task_syscall.go:239 +0x66 fp=0xc0008cbce0 sp=0xc0008cbc58 pc=0x9d3906
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0001f6000, 0x2e, 0x3, 0x20000040, 0x0, 0x4, 0x1, 0x1, 0x0, 0x0)
	pkg/sentry/kernel/task_syscall.go:199 +0x98 fp=0xc0008cbd40 sp=0xc0008cbce0 pc=0x9d34b8
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc0001f6000, 0x2, 0xc0001f6000)
	pkg/sentry/kernel/task_syscall.go:174 +0x15c fp=0xc0008cbe10 sp=0xc0008cbd40 pc=0x9d2e5c
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0x0, 0xc0001f6000, 0x12f80c0, 0x0)
	pkg/sentry/kernel/task_run.go:282 +0xc45 fp=0xc0008cbf60 sp=0xc0008cbe10 pc=0x9c7265
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc0001f6000, 0x1b)
	pkg/sentry/kernel/task_run.go:97 +0x1af fp=0xc0008cbfd0 sp=0xc0008cbf60 pc=0x9c5f2f
runtime.goexit()
	src/runtime/asm_amd64.s:1374 +0x1 fp=0xc0008cbfd8 sp=0xc0008cbfd0 pc=0x4705a1
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:323 +0xfe