syzbot

panic: runtime error: integer divide by zero

goroutine 10398 gp=0xc001300c40 m=5 mp=0xc000180008 [running]:
panic({0x1cb1ac0?, 0x2cbdcc0?})
	bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/stdlib_/src/runtime/panic.go:804 +0x168 fp=0xc001e7b060 sp=0xc001e7afb0 pc=0x478708
runtime.panicdivide()
	bazel-out/k8-fastbuild/bin/external/io_bazel_rules_go/stdlib_/src/runtime/panic.go:241 +0x3e fp=0xc001e7b080 sp=0xc001e7b060 pc=0x43b0fe
gvisor.dev/gvisor/pkg/sentry/socket/netstack/packetmmap.(*ringBuffer).init(0xc000462510, {0x20c5fa0, 0xc001158008}, 0xc001802560)
	pkg/sentry/socket/netstack/packetmmap/ring_buffer.go:62 +0x88e fp=0xc001e7b220 sp=0xc001e7b080 pc=0x10bb94e
gvisor.dev/gvisor/pkg/sentry/socket/netstack/packetmmap.(*Endpoint).Init(0xc000462508, {0x20c5fa0, 0xc001158008}, {0xc001802560, 0x1, 0x0, 0xc000493008, 0xc0012540f0, 0xc001e28450, 0x0, ...})
	pkg/sentry/socket/netstack/packetmmap/endpoint.go:128 +0x913 fp=0xc001e7b308 sp=0xc001e7b220 pc=0x10b7b73
gvisor.dev/gvisor/pkg/sentry/socket/netstack.setSockOptPacket(0xc001158008, {0xc001e7b470?, 0xc001e7b480?}, {0x7f7364087c20, 0xc001254000}, 0x5, {0xc001158b1c, 0x1c, 0x90})
	pkg/sentry/socket/netstack/netstack.go:2745 +0x56b fp=0xc001e7b430 sp=0xc001e7b308 pc=0x120dccb
gvisor.dev/gvisor/pkg/sentry/socket/netstack.SetSockOpt(0xc001158008, {0x20d8038, 0xc0011fe500}, {0x7f7364087c20, 0xc001254000}, 0x107, 0x5, {0xc001158b1c, 0x1c, 0x90})
	pkg/sentry/socket/netstack/netstack.go:1873 +0x366 fp=0xc001e7b490 sp=0xc001e7b430 pc=0x1206b26
gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*sock).SetSockOpt(0xc0011fe500, 0xc001158008, 0x107, 0x5, {0xc001158b1c, 0x1c, 0x90})
	pkg/sentry/socket/netstack/netstack.go:634 +0x6aa fp=0xc001e7b5b0 sp=0xc001e7b490 pc=0x11fc08a
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.SetSockOpt(0xc001158008, 0x4af9af?, {{0x6}, {0x107}, {0x5}, {0x200000000040}, {0x1c}, {0x0}})
	pkg/sentry/syscalls/linux/sys_socket.go:551 +0x46c fp=0xc001e7b6e8 sp=0xc001e7b5b0 pc=0x12cb74c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc001158008, 0x36, {{0x6}, {0x107}, {0x5}, {0x200000000040}, {0x1c}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:143 +0xb9f fp=0xc001e7b998 sp=0xc001e7b6e8 pc=0xff6c3f
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc001158008, 0x36, {{0x6}, {0x107}, {0x5}, {0x200000000040}, {0x1c}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:323 +0x85 fp=0xc001e7ba40 sp=0xc001e7b998 pc=0xff8d65
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc001158008, 0x36, {{0x6}, {0x107}, {0x5}, {0x200000000040}, {0x1c}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:283 +0xc7 fp=0xc001e7bab0 sp=0xc001e7ba40 pc=0xff8687
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc001158008)
	pkg/sentry/kernel/task_syscall.go:258 +0x54a fp=0xc001e7bbd0 sp=0xc001e7bab0 pc=0xff81ea
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc001158008?, 0xc001158008)
	pkg/sentry/kernel/task_run.go:269 +0x2295 fp=0xc001e7be78 sp=0xc001e7bbd0 pc=0xfe2a55
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc001158008, 0x626)
	pkg/sentry/kernel/task_run.go:97 +0x41b fp=0xc001e7bfb0 sp=0xc001e7be78 pc=0xfdfd7b
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.gowrap1()
	pkg/sentry/kernel/task_start.go:412 +0x45 fp=0xc001e7bfe0 sp=0xc001e7bfb0 pc=0xff4545
runtime.goexit({})
	src/runtime/asm_amd64.s:1700 +0x1 fp=0xc001e7bfe8 sp=0xc001e7bfe0 pc=0x481a81
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start in goroutine 10397
	pkg/sentry/kernel/task_start.go:412 +0x185