QSocketNotifier: Can only be used with threads started with QThread

[Dmitri A. Sergatskov]

I started getting this message at octave startup  with recent dev version on
an (old and slow)  laptop (which otherwise has a stock fedora 31).

Here is a part of a strace log (strace ./run-octave -q -f  2>err.log):

<<<<
openat(AT_FDCWD,
"/home/dima/.config/ibus/bus/c2ff2be9d75e4a6b981f607e96c3d982-unix-0",
O_RDONLY|O_CLOEXEC) = 4
statx(4, "", AT_STATX_SYNC_AS_STAT|AT_EMPTY_PATH, STATX_ALL,
{stx_mask=STATX_ALL, stx_attributes=0, stx_mode=S_IFREG|0644,
stx_size=173, ...}) = 0
statx(4, "", AT_STATX_SYNC_AS_STAT|AT_EMPTY_PATH, STATX_ALL,
{stx_mask=STATX_ALL, stx_attributes=0, stx_mode=S_IFREG|0644,
stx_size=173, ...}) = 0
statx(4, "", AT_STATX_SYNC_AS_STAT|AT_EMPTY_PATH, STATX_ALL,
{stx_mask=STATX_ALL, stx_attributes=0, stx_mode=S_IFREG|0644,
stx_size=173, ...}) = 0
read(4, "# This file is created by ibus-d"..., 16384) = 173
read(4, "", 16211)                      = 0
statx(4, "", AT_STATX_SYNC_AS_STAT|AT_EMPTY_PATH, STATX_ALL,
{stx_mask=STATX_ALL, stx_attributes=0, stx_mode=S_IFREG|0644,
stx_size=173, ...}) = 0
kill(1525, 0)                           = 0
mmap(NULL, 8392704, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK,
-1, 0) = 0x7f5d8a7b1000
mprotect(0x7f5d8a7b2000, 8388608, PROT_READ|PROT_WRITE) = 0
clone(child_stack=0x7f5d8afa1cf0,
flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID,
parent_tid=[303487], tls=0x7f5d8afb1700, child_tidptr=0x7f5d8afb19d0)
= 303487
futex(0x20abb70, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7ffc56e6aaf0, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
close(4)                                = 0
inotify_init1(IN_CLOEXEC)               = 4
openat(AT_FDCWD, "/usr/share/qt5/qtlogging.ini", O_RDONLY|O_CLOEXEC) = 7
statx(7, "", AT_STATX_SYNC_AS_STAT|AT_EMPTY_PATH, STATX_ALL,
{stx_mask=STATX_ALL, stx_attributes=0, stx_mode=S_IFREG|0644,
stx_size=56, ...}) = 0
statx(7, "", AT_STATX_SYNC_AS_STAT|AT_EMPTY_PATH, STATX_ALL,
{stx_mask=STATX_ALL, stx_attributes=0, stx_mode=S_IFREG|0644,
stx_size=56, ...}) = 0
read(7, "[Rules]\n*.debug=false\nqt.qpa.xcb"..., 16384) = 56
read(7, "", 16328)                      = 0
read(7, "", 16384)                      = 0
close(7)                                = 0
statx(AT_FDCWD, "/home/dima/.config/QtProject/qtlogging.ini",
AT_STATX_SYNC_AS_STAT, STATX_ALL, {stx_mask=STATX_ALL,
stx_attributes=0, stx_mode=S_IFREG|0664, stx_size=39, ...}) = 0
openat(AT_FDCWD, "/home/dima/.config/QtProject/qtlogging.ini",
O_RDONLY|O_CLOEXEC) = 7
statx(7, "", AT_STATX_SYNC_AS_STAT|AT_EMPTY_PATH, STATX_ALL,
{stx_mask=STATX_ALL, stx_attributes=0, stx_mode=S_IFREG|0664,
stx_size=39, ...}) = 0
statx(7, "", AT_STATX_SYNC_AS_STAT|AT_EMPTY_PATH, STATX_ALL,
{stx_mask=STATX_ALL, stx_attributes=0, stx_mode=S_IFREG|0664,
stx_size=39, ...}) = 0
read(7, "[rules]\n*.debug=false\nfc.io.debu"..., 16384) = 39
read(7, "", 16345)                      = 0
read(7, "", 16384)                      = 0
close(7)                                = 0
openat(AT_FDCWD, "/dev/tty", O_RDONLY|O_CLOEXEC) = 7
close(7)                                = 0
clock_gettime(CLOCK_MONOTONIC, {tv_sec=35236, tv_nsec=163972006}) = 0
write(2, "QSocketNotifier: Can only be use"..., 68QSocketNotifier: Can
only be used with threads started with QThread
) = 68
fcntl(4, F_SETFD, FD_CLOEXEC)           = 0
openat(AT_FDCWD, "/var/lib/dbus/machine-id", O_RDONLY) = 7
>>>>

Anyone seen this?

octave runs ok after that.

Dmitri.
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