QTimeZone: offsetFromUtc() return INT_MIN

const QTimeZone &timeZone = QTimeZone::systemTimeZone();
int offsetInSeconds = INT_MIN;
if (timeZone.isValid()) {
    offsetInSeconds = timeZone.offsetFromUtc(QDateTime::currentDateTime());
    qDebug() << "timeZone" << timeZone << QTimeZone();
    qDebug() << "currentDateTime" << QDateTime::currentDateTime() << QDateTime::currentDateTimeUtc() << "offsetInSeconds" << offsetInSeconds;
}

timeZone QTimeZone("Etc/GMT-3") QTimeZone("") 
currentDateTime QDateTime(2019-12-26 13:32:08.849 +03 Qt::LocalTime) QDateTime(2019-12-26 10:32:08.849 UTC Qt::UTC) offsetInSeconds -2147483648

# date
Thu Dec 26 13:40:45 +03 2019
# ls -l /etc/localtime 
lrwxrwxrwx    1 root     root            25 Dec 26 13:04 /etc/localtime -> /mnt/persistent/localtime
# ls -l /mnt/persistent/localtime 
lrwxrwxrwx    1 root     root            29 Dec 26 13:32 /mnt/persistent/localtime -> /usr/share/zoneinfo/Etc/GMT-3
# ls -l /lib/libc-2.19-2014.08.so 
-rwxr-xr-x    1 root     root        911388 Dec 26 13:04 /lib/libc-2.19-2014.08.so
# cat /proc/cpuinfo 
Processor       : ARMv7 Processor rev 1 (v7l)
processor       : 0
BogoMIPS        : 7.52

processor       : 1
BogoMIPS        : 7.52

processor       : 2
BogoMIPS        : 7.52

processor       : 3
BogoMIPS        : 7.52

Features        : swp half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xc05
CPU revision    : 1

Hardware        : Amlogic Meson8B
Revision        : 000a
Serial          : 1b0000000000000