TITLE: DATA RACE in waiter.(*Entry).Next

getsockopt$sock_cred(0xffffffffffffffff, 0x1, 0x11, &(0x7f0000caaffb), &(0x7f0000cab000)=0xc)
setsockopt$inet_tcp_buf(r0, 0x6, 0x0, &(0x7f0000000240)="df", 0x1)

==================
WARNING: DATA RACE
Read at 0x00c420e3a1b8 by goroutine 185:
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Entry).Next()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:150 +0x4c
  gvisor.googlesource.com/gvisor/pkg/ilist.(*List).Remove()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:125 +0x6a
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).EventUnregister()
      pkg/waiter/waiter.go:167 +0x67
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*slaveFileOperations).EventUnregister()
      pkg/sentry/fs/tty/slave.go:114 +0x96
  gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).EventUnregister()
      pkg/sentry/fs/file.go:155 +0x5d
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.readv()
      pkg/sentry/syscalls/linux/sys_read.go:223 +0x5e1
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Readv()
      pkg/sentry/syscalls/linux/sys_read.go:144 +0x28c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:162 +0x14e
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:278 +0x7d
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:241 +0xc3
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:216 +0x19c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:217 +0x157c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:95 +0x264

Previous write at 0x00c420e3a1b8 by goroutine 221:
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Entry).SetNext()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:160 +0x50
  gvisor.googlesource.com/gvisor/pkg/ilist.(*List).PushBack()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:70 +0xee
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).EventRegister()
      pkg/waiter/waiter.go:160 +0x86
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*slaveFileOperations).EventRegister()
      pkg/sentry/fs/tty/slave.go:109 +0x10f
  gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).EventRegister()
      pkg/sentry/fs/file.go:150 +0x67
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.readv()
      pkg/sentry/syscalls/linux/sys_read.go:202 +0x3cb
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Readv()
      pkg/sentry/syscalls/linux/sys_read.go:144 +0x28c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:162 +0x14e
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:278 +0x7d
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:241 +0xc3
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:216 +0x19c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:217 +0x157c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:95 +0x264

Goroutine 185 (running) created at:
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start()
      pkg/sentry/kernel/task_start.go:251 +0x193
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Clone()
      pkg/sentry/kernel/task_clone.go:314 +0x10e6
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.clone()
      pkg/sentry/syscalls/linux/sys_thread.go:157 +0x22e
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Clone()
      pkg/sentry/syscalls/linux/sys_thread.go:171 +0x80
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:162 +0x14e
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:278 +0x7d
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:241 +0xc3
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:216 +0x19c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:217 +0x157c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:95 +0x264

Goroutine 221 (running) created at:
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start()
      pkg/sentry/kernel/task_start.go:251 +0x193
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Clone()
      pkg/sentry/kernel/task_clone.go:314 +0x10e6
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.clone()
      pkg/sentry/syscalls/linux/sys_thread.go:157 +0x22e
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Clone()
      pkg/sentry/syscalls/linux/sys_thread.go:171 +0x80
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:162 +0x14e
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:278 +0x7d
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:241 +0xc3
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:216 +0x19c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:217 +0x157c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:95 +0x264
==================

REPORT:
WARNING: DATA RACE
Read at 0x00c420e3a1b8 by goroutine 185:
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Entry).Next()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:150 +0x4c
  gvisor.googlesource.com/gvisor/pkg/ilist.(*List).Remove()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:125 +0x6a
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).EventUnregister()
      pkg/waiter/waiter.go:167 +0x67
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*slaveFileOperations).EventUnregister()
      pkg/sentry/fs/tty/slave.go:114 +0x96
  gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).EventUnregister()
      pkg/sentry/fs/file.go:155 +0x5d
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.readv()
      pkg/sentry/syscalls/linux/sys_read.go:223 +0x5e1
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Readv()
      pkg/sentry/syscalls/linux/sys_read.go:144 +0x28c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:162 +0x14e
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:278 +0x7d
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:241 +0xc3
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:216 +0x19c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:217 +0x157c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:95 +0x264

Previous write at 0x00c420e3a1b8 by goroutine 221:
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Entry).SetNext()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:160 +0x50
  gvisor.googlesource.com/gvisor/pkg/ilist.(*List).PushBack()
      bazel-out/k8-fastbuild/bin/pkg/ilist/interface_list.go:70 +0xee
  gvisor.googlesource.com/gvisor/pkg/waiter.(*Queue).EventRegister()
      pkg/waiter/waiter.go:160 +0x86
  gvisor.googlesource.com/gvisor/pkg/sentry/fs/tty.(*slaveFileOperations).EventRegister()
      pkg/sentry/fs/tty/slave.go:109 +0x10f
  gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*File).EventRegister()
      pkg/sentry/fs/file.go:150 +0x67
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.readv()
      pkg/sentry/syscalls/linux/sys_read.go:202 +0x3cb
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Readv()
      pkg/sentry/syscalls/linux/sys_read.go:144 +0x28c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).executeSyscall()
      pkg/sentry/kernel/task_syscall.go:162 +0x14e
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke()
      pkg/sentry/kernel/task_syscall.go:278 +0x7d
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter()
      pkg/sentry/kernel/task_syscall.go:241 +0xc3
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).doSyscall()
      pkg/sentry/kernel/task_syscall.go:216 +0x19c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute()
      pkg/sentry/kernel/task_run.go:217 +0x157c
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run()
      pkg/sentry/kernel/task_run.go:95 +0x264