Issue

• Why is docker-latest daemon crashing when "docker logs -f " is stopped in Red Hat Enterprise Linux 7 ?
  Following trace is seen in the logs

Username=dpaxton, LoginUID=662986662, PID=127201}"
May 15 03:38:52 masked dockerd-latest[126730]: fatal error: unexpected signal during runtime execution
May 15 03:38:52 masked dockerd-latest[126730]: [signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x7f836fe9afbe]
May 15 03:38:52 masked dockerd-latest[126730]: runtime stack:
May 15 03:38:52 masked dockerd-latest[126730]: runtime.throw(0x1a0d655, 0x2a)
May 15 03:38:52 masked dockerd-latest[126730]: /usr/lib/golang/src/runtime/panic.go:566 +0x95 fp=0x7f83657f9be8 sp=0x7f83657f9bc8
May 15 03:38:52 masked dockerd-latest[126730]: runtime.sigpanic()
May 15 03:38:52 masked dockerd-latest[126730]: /usr/lib/golang/src/runtime/sigpanic_unix.go:12 +0x2cc fp=0x7f83657f9c40 sp=0x7f83657f9be8
May 15 03:38:52 masked dockerd-latest[126730]: goroutine 338 [syscall, locked to thread]:
May 15 03:38:52 masked dockerd-latest[126730]: runtime.cgocall(0x152de20, 0xc420931d90, 0x0)
May 15 03:38:52 masked dockerd-latest[126730]: /usr/lib/golang/src/runtime/cgocall.go:131 +0x110 fp=0xc420931d60 sp=0xc420931d20
May 15 03:38:52 masked dockerd-latest[126730]: github.com/docker/docker/daemon/logger/journald._Cfunc_free(0x7f835000db50)
May 15 03:38:52 masked dockerd-latest[126730]: github.com/docker/docker/daemon/logger/journald/_obj/_cgo_gotypes.go:108 +0x41 fp=0xc420931d90 sp=0xc420931d60
May 15 03:38:52 masked dockerd-latest[126730]: github.com/docker/docker/daemon/logger/journald.(*journald).drainJournal(0xc420ff8620, 0xc420dbd440, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x1, 0x7f835000d0d0, 0x7f835000db50, 0x180001)
May 15 03:38:52 masked dockerd-latest[126730]: /builddir/build/BUILD/docker-677427538684e8297245ff74f081b1bf3ef5f1ec/_build/src/github.com/docker/docker/daemon/logger/journald/read.go:239 +0x263 fp=0xc420931ec0 sp=0xc420931d90
May 15 03:38:52 masked dockerd-latest[126730]: github.com/docker/docker/daemon/logger/journald.(*journald).followJournal.func1(0x7f835000d0d0, 0x2300000012, 0xc421f85088, 0xc420ff8620, 0xc420dbd440, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x1)
May 15 03:38:52 masked dockerd-latest[126730]: /builddir/build/BUILD/docker-677427538684e8297245ff74f081b1bf3ef5f1ec/_build/src/github.com/docker/docker/daemon/logger/journald/read.go:267 +0x21e fp=0xc420931f70 sp=0xc420931ec0
May 15 03:38:52 masked dockerd-latest[126730]: runtime.goexit()