syzbot

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x30 pc=0x97582d]

goroutine 4332 [running]:
panic({0xf42e80, 0x1b9ebf0})
	GOROOT/src/runtime/panic.go:941 +0x397 fp=0xc0006d3540 sp=0xc0006d3480 pc=0x435a77
runtime.panicmem(...)
	GOROOT/src/runtime/panic.go:220
runtime.sigpanic()
	GOROOT/src/runtime/signal_unix.go:818 +0x336 fp=0xc0006d3590 sp=0xc0006d3540 pc=0x44c536
gvisor.dev/gvisor/pkg/sentry/mm.(*MemoryManager).CheckIORange(...)
	pkg/sentry/mm/io.go:71
gvisor.dev/gvisor/pkg/sentry/kernel.makeIovec({0x12c9078?, 0xc0023647a0?}, 0xc00366a000, 0xffffffffffffffff?, {0xc00366a944, 0xb0?, 0x90})
	pkg/sentry/kernel/task_usermem.go:270 +0xad fp=0xc0006d35c8 sp=0xc0006d3590 pc=0x97582d
gvisor.dev/gvisor/pkg/sentry/kernel.copyInIovecs({0x12c9078, 0xc0023647a0}, 0xc00366a000, 0x20000240, 0x3)
	pkg/sentry/kernel/task_usermem.go:231 +0x1ee fp=0xc0006d3668 sp=0xc0006d35c8 pc=0x97564e
gvisor.dev/gvisor/pkg/sentry/kernel.(*taskCopyContext).CopyInIovecs(...)
	pkg/sentry/kernel/task_usermem.go:411
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.doProcessVMReadWrite.func1()
	pkg/sentry/syscalls/linux/sys_process_vm.go:104 +0xad fp=0xc0006d3768 sp=0xc0006d3668 pc=0xaa5ded
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.doProcessVMReadWrite(0xc000e46000, 0xc00366a000, 0x20000080, 0x20000240, 0x1, 0x3, 0x0)
	pkg/sentry/syscalls/linux/sys_process_vm.go:174 +0x1ae fp=0xc0006d37d8 sp=0xc0006d3768 pc=0xaa5cae
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.processVMRW(0x86215?, {{0x308}, {0x20000080}, {0x1}, {0x20000240}, {0x3}, {0x0}}, 0x1)
	pkg/sentry/syscalls/linux/sys_process_vm.go:84 +0x167 fp=0xc0006d3850 sp=0xc0006d37d8 pc=0xaa5a67
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.ProcessVMWritev(0x1?, {{0x308}, {0x20000080}, {0x1}, {0x20000240}, {0x3}, {0x0}})
	pkg/sentry/syscalls/linux/sys_process_vm.go:42 +0x3b fp=0xc0006d38a0 sp=0xc0006d3850 pc=0xaa58db
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000e46000, 0x137, {{0x308}, {0x20000080}, {0x1}, {0x20000240}, {0x3}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:142 +0x755 fp=0xc0006d3c90 sp=0xc0006d38a0 pc=0x9724f5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000e46000, 0xc002f251b8?, {{0x308}, {0x20000080}, {0x1}, {0x20000240}, {0x3}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:322 +0x4a fp=0xc0006d3cf0 sp=0xc0006d3c90 pc=0x97372a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0x0?, 0xc00036e000?, {{0x308}, {0x20000080}, {0x1}, {0x20000240}, {0x3}, {0x0}})
	pkg/sentry/kernel/task_syscall.go:282 +0x65 fp=0xc0006d3d50 sp=0xc0006d3cf0 pc=0x973405
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc002755860?)
	pkg/sentry/kernel/task_syscall.go:257 +0x2f0 fp=0xc0006d3e48 sp=0xc0006d3d50 pc=0x973170
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc002cb2a00?, 0xc000e46000)
	pkg/sentry/kernel/task_run.go:253 +0xdea fp=0xc0006d3f60 sp=0xc0006d3e48 pc=0x96770a
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000e46000, 0x307)
	pkg/sentry/kernel/task_run.go:94 +0x1ac fp=0xc0006d3fc0 sp=0xc0006d3f60 pc=0x96630c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.func1()
	pkg/sentry/kernel/task_start.go:378 +0x2a fp=0xc0006d3fe0 sp=0xc0006d3fc0 pc=0x970d4a
runtime.goexit()
	src/runtime/asm_amd64.s:1571 +0x1 fp=0xc0006d3fe8 sp=0xc0006d3fe0 pc=0x469781
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
	pkg/sentry/kernel/task_start.go:378 +0xf9