syzbot

WARNING: DATA RACE
Read at 0x00c0024d49d8 by goroutine 7602:
  gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).checkAndPreventSharingOutsideTG.func1()
      pkg/sentry/kernel/fs_context.go:205 +0x40
  gvisor.dev/gvisor/pkg/sentry/kernel.(*ThreadGroup).ForEachTask()
      pkg/sentry/kernel/threads.go:520 +0x104
  gvisor.dev/gvisor/pkg/sentry/kernel.(*FSContext).checkAndPreventSharingOutsideTG()
      pkg/sentry/kernel/fs_context.go:204 +0xd4
  gvisor.dev/gvisor/pkg/sentry/kernel.(*runExecveAfterExecveCredsLock).execute()
      pkg/sentry/kernel/task_exec.go:155 +0x258
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:97 +0x390
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.gowrap1()
      pkg/sentry/kernel/task_start.go:416 +0x40

Previous write at 0x00c0024d49d8 by goroutine 7590:
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Unshare()
      pkg/sentry/kernel/task_clone.go:705 +0xd8c
  gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Unshare()
      pkg/sentry/syscalls/linux/sys_thread.go:453 +0x54
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:143 +0x68c
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:323 +0x4c
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:283 +0x74
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:258 +0x3bc
  gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:269 +0x1564
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:97 +0x390
  gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).Start.gowrap1()
      pkg/sentry/kernel/task_start.go:416 +0x40