I0826 20:43:35.641916 7483 x:0] Watchdog starting loop, tasks: 12, discount: 0s I0826 20:44:05.577794 14035 x:0] *************************** I0826 20:44:05.579891 14035 x:0] Args: [/syzkaller/managers/kvm-direct-overlay-host-race/current/image -root /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root -watchdog-action=panic -network=none -platform=ptrace -file-access=direct -overlay -network=host exec -user=0:0 -cap CAP_CHOWN -cap CAP_DAC_OVERRIDE -cap CAP_DAC_READ_SEARCH -cap CAP_FOWNER -cap CAP_FSETID -cap CAP_KILL -cap CAP_SETGID -cap CAP_SETUID -cap CAP_SETPCAP -cap CAP_LINUX_IMMUTABLE -cap CAP_NET_BIND_SERVICE -cap CAP_NET_BROADCAST -cap CAP_NET_ADMIN -cap CAP_NET_RAW -cap CAP_IPC_LOCK -cap CAP_IPC_OWNER -cap CAP_SYS_MODULE -cap CAP_SYS_RAWIO -cap CAP_SYS_CHROOT -cap CAP_SYS_PTRACE -cap CAP_SYS_PACCT -cap CAP_SYS_ADMIN -cap CAP_SYS_BOOT -cap CAP_SYS_NICE -cap CAP_SYS_RESOURCE -cap CAP_SYS_TIME -cap CAP_SYS_TTY_CONFIG -cap CAP_MKNOD -cap CAP_LEASE -cap CAP_AUDIT_WRITE -cap CAP_AUDIT_CONTROL -cap CAP_SETFCAP -cap CAP_MAC_OVERRIDE -cap CAP_MAC_ADMIN -cap CAP_SYSLOG -cap CAP_WAKE_ALARM -cap CAP_BLOCK_SUSPEND -cap CAP_AUDIT_READ ci-gvisor-kvm-direct-overlay-host-race-3 /syz-execprog -executor=/syz-executor -arch=amd64 -sandbox=none -procs=1 -repeat=1 -threaded=true -collide=true -cover=0 -fault_call=-1 -fault_nth=-1 /syzkaller541557967] I0826 20:44:05.580198 14035 x:0] Git Revision: d4d5ed1d9def507b1f2ff3ff8ec75813e931f129 I0826 20:44:05.580222 14035 x:0] PID: 14035 I0826 20:44:05.580248 14035 x:0] UID: 0, GID: 0 I0826 20:44:05.580287 14035 x:0] Configuration: I0826 20:44:05.580302 14035 x:0] RootDir: /syzkaller/managers/kvm-direct-overlay-host-race/workdir/gvisor_root I0826 20:44:05.580340 14035 x:0] Platform: ptrace I0826 20:44:05.580362 14035 x:0] FileAccess: direct, overlay: true I0826 20:44:05.580396 14035 x:0] Network: host, logging: false I0826 20:44:05.580453 14035 x:0] Strace: false, max size: 1024, syscalls: [] I0826 20:44:05.580482 14035 x:0] *************************** I0826 20:44:05.598829 7483 x:0] EXEC: [/syz-execprog -executor=/syz-executor -arch=amd64 -sandbox=none -procs=1 -repeat=1 -threaded=true -collide=true -cover=0 -fault_call=-1 -fault_nth=-1 /syzkaller541557967] 2018/08/26 20:44:07 parsed 1 programs 2018/08/26 20:44:07 executed programs: 0 ================== WARNING: DATA RACE Write at 0x00c4205dbe28 by goroutine 295: gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).setKUIDsUncheckedLocked() pkg/sentry/kernel/task_identity.go:167 +0x1d0 gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).SetRESUID() pkg/sentry/kernel/task_identity.go:159 +0x16d gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Setresuid() pkg/sentry/syscalls/linux/sys_identity.go:117 +0x57 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:280 +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 +0x19e gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute() pkg/sentry/kernel/task_run.go:219 +0x1501 gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run() pkg/sentry/kernel/task_run.go:95 +0x264 Previous read at 0x00c4205dbe28 by goroutine 300: gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Value() pkg/sentry/kernel/task.go:577 +0x71b gvisor.googlesource.com/gvisor/pkg/sentry/kernel/auth.CredentialsFromContext() pkg/sentry/kernel/auth/context.go:32 +0x5a gvisor.googlesource.com/gvisor/pkg/sentry/fs.FileOwnerFromContext() pkg/sentry/fs/context.go:85 +0x46 gvisor.googlesource.com/gvisor/pkg/sentry/fs/proc.(*file).UnstableAttr() pkg/sentry/fs/proc/file.go:54 +0x1e5 gvisor.googlesource.com/gvisor/pkg/sentry/fs.(*Inode).UnstableAttr() pkg/sentry/fs/inode.go:254 +0x217 gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.stat() pkg/sentry/syscalls/linux/sys_stat.go:106 +0x9d gvisor.googlesource.com/gvisor/pkg/sentry/syscalls/linux.Fstat() pkg/sentry/syscalls/linux/sys_stat.go:98 +0x108 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:280 +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 +0x19e gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute() pkg/sentry/kernel/task_run.go:219 +0x1501 gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run() pkg/sentry/kernel/task_run.go:95 +0x264 Goroutine 295 (running) created at: gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start() pkg/sentry/kernel/task_start.go:258 +0x193 gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Clone() pkg/sentry/kernel/task_clone.go:319 +0x10f1 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:280 +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 +0x19e gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute() pkg/sentry/kernel/task_run.go:219 +0x1501 gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run() pkg/sentry/kernel/task_run.go:95 +0x264 Goroutine 300 (running) created at: gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Start() pkg/sentry/kernel/task_start.go:258 +0x193 gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).Clone() pkg/sentry/kernel/task_clone.go:319 +0x10f1 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:280 +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 +0x19e gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*runApp).execute() pkg/sentry/kernel/task_run.go:219 +0x1501 gvisor.googlesource.com/gvisor/pkg/sentry/kernel.(*Task).run() pkg/sentry/kernel/task_run.go:95 +0x264 ================== I0826 20:44:09.070318 14035 x:0] Exiting with status: 0