WARNING: DATA RACE
Read at 0x00c0022abc28 by goroutine 2066:
  gvisor.dev/gvisor/pkg/sentry/kernel.(*ThreadGroup).endGroupStopLocked()
      pkg/sentry/kernel/task_signals.go:829 +0x317
  gvisor.dev/gvisor/pkg/sentry/kernel.(*ThreadGroup).applySignalSideEffectsLocked()
      pkg/sentry/kernel/task_signals.go:497 +0x10d
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).sendSignalTimerLocked()
      pkg/sentry/kernel/task_signals.go:419 +0xc5
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).sendSignalLocked()
      pkg/sentry/kernel/task_signals.go:402 +0xc9
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).SendSignal()
      pkg/sentry/kernel/task_signals.go:380 +0xca
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Tgkill()
      pkg/sentry/syscalls/linux/sys_signal.go:241 +0x171
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:143 +0x994
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:323 +0x71
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:283 +0x93
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:258 +0x4af
  gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:269 +0x1fad
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:97 +0x4fa
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.gowrap1()
      pkg/sentry/kernel/task_start.go:412 +0x44

Previous write at 0x00c0022abc28 by goroutine 2094:
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).ptraceAttach()
      pkg/sentry/kernel/ptrace.go:528 +0x3bd
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Ptrace()
      pkg/sentry/kernel/ptrace.go:1023 +0x18a
D0326 17:04:14.759153       1 task_stop.go:136] [ 130(  16): 130(  16)] Leaving internal stop (*kernel.groupStop)(nil)
D0326 17:04:14.759237       1 task_signals.go:477] [ 130(  16): 130(  16)] No task notified of signal 18
D0326 17:04:14.759311       1 task_signals.go:218] [ 128(  14): 129(  15)] Signal 17: delivering to handler
D0326 17:04:14.759417       1 task_signals.go:477] [ 130(  16): 130(  16)] No task notified of signal 19
D0326 17:04:14.759598       1 task_signals.go:466] [ 128(  14): 139(  18)] Notified of signal 17
D0326 17:04:14.759746       1 task_signals.go:218] [ 128(  14): 129(  15)] Signal 17: delivering to handler
D0326 17:04:14.759742       1 ptrace.go:668] [ 130(  16): 130(  16)] Entering signal-delivery-stop for signal 19
D0326 17:04:14.759787       1 task_run.go:192] [ 128(  14): 139(  18)] Restarting syscall 202: not interrupted by handled signal
D0326 17:04:14.759835       1 task_stop.go:116] [ 130(  16): 130(  16)] Entering internal stop &kernel.ptraceStop{frozen:false, listen:false}
D0326 17:04:14.759921       1 task_signals.go:466] [ 128(  14): 139(  18)] Notified of signal 17
D0326 17:04:14.760030       1 task_signals.go:174] [ 128(  14): 139(  18)] Not restarting syscall 202 after error to be restarted if SA_RESTART is set: interrupted by signal 17
D0326 17:04:14.760112       1 task_signals.go:218] [ 128(  14): 139(  18)] Signal 17: delivering to handler
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Ptrace()
      pkg/sentry/syscalls/linux/sys_thread.go:789 +0x3a
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:143 +0x994
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:323 +0x71
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:283 +0x93
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:258 +0x4af
  gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:269 +0x1fad
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:97 +0x4fa
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.gowrap1()
      pkg/sentry/kernel/task_start.go:412 +0x44