panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0xd3b5d0]
goroutine 259 [running]:
panic({0x1981000, 0x28bac50})
GOROOT/src/runtime/panic.go:1147 +0x3a8 fp=0xc0009bb000 sp=0xc0009baf40 pc=0x437d08
runtime.panicmem(...)
GOROOT/src/runtime/panic.go:221
runtime.sigpanic()
GOROOT/src/runtime/signal_unix.go:735 +0x327 fp=0xc0009bb050 sp=0xc0009bb000 pc=0x450187
gvisor.dev/gvisor/pkg/sentry/kernel.(*ThreadGroup).MigrateCgroup(0x0, {0xc00060ae10, {0x1dc1b20, 0xc0004baa80}})
pkg/sentry/kernel/task_cgroup.go:140 +0x90 fp=0xc0009bb170 sp=0xc0009bb050 pc=0xd3b5d0
gvisor.dev/gvisor/pkg/sentry/fsimpl/cgroupfs.(*cgroupProcsData).Write(0xc0003c61e0, {0x1dd7c30, 0xc000722a80}, 0x40f47d, {{0x1dcb3e8, 0xc000420000}, {0x0, 0x1, 0x20000080, 0xb}, ...}, ...)
pkg/sentry/fsimpl/cgroupfs/base.go:305 +0x1c7 fp=0xc0009bb218 sp=0xc0009bb170 pc=0x112d1c7
gvisor.dev/gvisor/pkg/sentry/vfs.(*DynamicBytesFileDescriptionImpl).pwriteLocked(0xc0009342a0, {0x1dd7c30, 0xc000722a80}, {{0x1dcb3e8, 0xc000420000}, {0x0, 0x1, 0x20000080, 0xb}, {0x0, ...}}, ...)
pkg/sentry/vfs/file_description_impl_util.go:381 +0x331 fp=0xc0009bb380 sp=0xc0009bb218 pc=0x919151
gvisor.dev/gvisor/pkg/sentry/vfs.(*DynamicBytesFileDescriptionImpl).Write(0xc0009342a0, {0x1dd7c30, 0xc000722a80}, {{0x1dcb3e8, 0xc000420000}, {0x0, 0x1, 0x20000080, 0xb}, {0x0, ...}}, ...)
pkg/sentry/vfs/file_description_impl_util.go:402 +0x136 fp=0xc0009bb460 sp=0xc0009bb380 pc=0x919636
gvisor.dev/gvisor/pkg/sentry/fsimpl/kernfs.(*DynamicBytesFD).Write(0xc0009342a0, {0x1dd7c30, 0xc000722a80}, {{0x1dcb3e8, 0xc000420000}, {0x0, 0x1, 0x20000080, 0xb}, {0x0, ...}}, ...)
pkg/sentry/fsimpl/kernfs/dynamic_bytes_file.go:125 +0xac fp=0xc0009bb4e8 sp=0xc0009bb460 pc=0xab754c
gvisor.dev/gvisor/pkg/sentry/vfs.(*FileDescription).Write(0xc000934300, {0x1dd7c30, 0xc000722a80}, {{0x1dcb3e8, 0xc000420000}, {0x0, 0x1, 0x20000080, 0xb}, {0x0, ...}}, ...)
pkg/sentry/vfs/file_description.go:665 +0x14c fp=0xc0009bb5b0 sp=0xc0009bb4e8 pc=0x913b0c
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.write(0xc0009bb7c0, 0x43c865, {{0x1dcb3e8, 0xc000420000}, {0x0, 0x1, 0x20000080, 0xb}, {0x0, 0x1}}, ...)
pkg/sentry/syscalls/linux/vfs2/read_write.go:348 +0xae fp=0xc0009bb740 sp=0xc0009bb5b0 pc=0x149296e
gvisor.dev/gvisor/pkg/sentry/syscalls/linux/vfs2.Write(0xc000722a80, {{0x4}, {0x20000080}, {0xb}, {0x0}, {0x17}, {0x7fffdac80e78}})
pkg/sentry/syscalls/linux/vfs2/read_write.go:317 +0x36f fp=0xc0009bb8e0 sp=0xc0009bb740 pc=0x1491eef
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall(0xc000722a80, 0x7fb180051c58, {{0x4}, {0x20000080}, {0xb}, {0x0}, {0x17}, {0x7fffdac80e78}})
pkg/sentry/kernel/task_syscall.go:103 +0x411 fp=0xc0009bba88 sp=0xc0009bb8e0 pc=0xd70131
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke(0xc000722a80, 0x1, {{0x4}, {0x20000080}, {0xb}, {0x0}, {0x17}, {0x7fffdac80e78}})
pkg/sentry/kernel/task_syscall.go:238 +0x8e fp=0xc0009bbb18 sp=0xc0009bba88 pc=0xd715ae
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter(0xc0007200f0, 0x1, {{0x4}, {0x20000080}, {0xb}, {0x0}, {0x17}, {0x7fffdac80e78}})
pkg/sentry/kernel/task_syscall.go:198 +0xc5 fp=0xc0009bbb90 sp=0xc0009bbb18 pc=0xd70ea5
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall(0xc000722a80)
pkg/sentry/kernel/task_syscall.go:173 +0x4a7 fp=0xc0009bbca0 sp=0xc0009bbb90 pc=0xd709c7
gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute(0xc000722a80, 0xc000722a80)
pkg/sentry/kernel/task_run.go:254 +0x19dc fp=0xc0009bbeb8 sp=0xc0009bbca0 pc=0xd5b87c
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run(0xc000722a80, 0xc)
pkg/sentry/kernel/task_run.go:95 +0x2d4 fp=0xc0009bbfb0 sp=0xc0009bbeb8 pc=0xd59454
gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start·dwrap·236()
pkg/sentry/kernel/task_start.go:339 +0x48 fp=0xc0009bbfe0 sp=0xc0009bbfb0 pc=0xd6de68
runtime.goexit()
src/runtime/asm_amd64.s:1581 +0x1 fp=0xc0009bbfe8 sp=0xc0009bbfe0 pc=0x46e081
created by gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start
pkg/sentry/kernel/task_start.go:339 +0x1d1