panic: inconsistent poll.fdMutex

goroutine 54 [running]:
internal/poll.(*fdMutex).rwunlock(0xc0003f9990?, 0x27?)
	/usr/local/go/src/internal/poll/fd_mutex.go:179 +0xde
internal/poll.(*FD).readUnlock(0xc0003bb080)
	/usr/local/go/src/internal/poll/fd_mutex.go:231 +0x1f
internal/poll.(*FD).Read(0xc0003bb080, {0xc0000131a0, 0xc, 0xc})
	/usr/local/go/src/internal/poll/fd_unix.go:170 +0x351
os.(*File).read(...)
	/usr/local/go/src/os/file_posix.go:29
os.(*File).Read(0xc000060138, {0xc0000131a0?, 0xc0003f9ab0?, 0x411ae5?})
	/usr/local/go/src/os/file.go:118 +0x52
io.ReadAtLeast({0xd250a0, 0xc000060138}, {0xc0000131a0, 0xc, 0xc}, 0xc)
	/usr/local/go/src/io/io.go:335 +0x90
io.ReadFull(...)
	/usr/local/go/src/io/io.go:354
github.com/google/syzkaller/pkg/ipc.(*command).exec(0xc0000d6980, 0xc0003f9e80?, {0x0, 0x0, 0x0})
	/syzkaller/gopath/src/github.com/google/syzkaller/pkg/ipc/ipc.go:840 +0x567
github.com/google/syzkaller/pkg/ipc.(*Env).ExecProg(0xc0000d6680, 0xc0003f9e80, {0xc00028ef00, 0x2371, 0x2371})
	/syzkaller/gopath/src/github.com/google/syzkaller/pkg/ipc/ipc.go:317 +0x15e
main.(*Proc).execute(0xc0003046c0, {0xb7e, {0xc00028ef00, 0x2371, 0x2371}, {0x15, 0x4762, 0x0}, 0x1, 0x0, ...})
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:87 +0x15b
main.(*Proc).loop(0xc0003046c0)
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:48 +0x158
created by main.startProc in goroutine 1
	/syzkaller/gopath/src/github.com/google/syzkaller/syz-fuzzer/proc.go:35 +0x11b