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🐞 Fixed [469]
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DATA RACE in kernel.(*FSContext).SetRootDirectory

Status: fixed on 2018/06/27 00:32
Fix commit: 478f0ac0038a Don't read FSContext.root without holding FSContext.mu
First crash: 2348d, last: 2345d

Sample crash report:
WARNING: DATA RACE
Write at 0x00c42040e268 by goroutine 123:
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*FSContext).SetRootDirectory()
      pkg/sentry/kernel/fs_context.go:153 +0xd7
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Chroot.func1()
      pkg/sentry/syscalls/linux/sys_file.go:625 +0x1a5
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.fileOpOn()
      pkg/sentry/syscalls/linux/sys_file.go:111 +0x235
  gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Chroot()
      pkg/sentry/syscalls/linux/sys_file.go:614 +0x17e
  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 read at 0x00c42040e268 by goroutine 125:
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).IsChrooted()
      pkg/sentry/kernel/task_resources.go:125 +0xd9
  gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Clone()
      pkg/sentry/kernel/task_clone.go:177 +0x1fdb
  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

Crashes (165):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/06/23 20:09 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report syz C ci-gvisor-ptrace-proxy-sandbox-race
2018/06/26 13:09 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 089f1181 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/26 11:01 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/26 09:27 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/26 08:18 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/26 07:18 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/26 06:08 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/26 05:06 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/26 02:58 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/26 02:32 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/26 01:28 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/26 00:18 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 23:14 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 21:49 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 20:28 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 17:53 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 16:46 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 16:25 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 15:11 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 13:51 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 12:15 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 10:55 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 09:43 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 08:41 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 07:17 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 06:08 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 04:38 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 03:28 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 03:14 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/25 01:56 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/24 23:15 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/24 22:14 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/24 21:12 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/24 20:10 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/24 19:56 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/24 18:12 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/24 16:49 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/24 15:38 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/24 14:30 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/24 13:19 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/24 13:18 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/24 13:13 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/24 13:08 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 2064fc5c .config console log report ci-gvisor-ptrace-proxy-sandbox-race
2018/06/23 09:37 https://github.com/dvyukov/gvisor.git race 60dbbdc2d54b 665947c7 .config console log report ci-gvisor-ptrace-proxy-sandbox-race
* Struck through repros no longer work on HEAD.