Below is part of the strace of gwenview (the KDE image viewer program) which
hangs for 50 seconds on startup while waiting for a futex. How can I discover
what this futex is about? This started just after I rebooted my workstation
to the 5.10.0-10-amd64 kernel from the recent Debian/Bullseye update. The
system is running mostly Bullseye with a few packages from Testing including
libc6 which may be related to the problem (an almost identical system with the
Bullseye libc6 is fine).
Any ideas on how to investigate this?
bind(14, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=0x000002}, 12) = 0
getsockname(14, {sa_family=AF_NETLINK, nl_pid=35827, nl_groups=0x000002},
[12]) = 0
write(5, "\1\0\0\0\0\0\0\0", 8) = 8
write(7, "\1\0\0\0\0\0\0\0", 8) = 8
futex(0x7ffcf7c1b0d0, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
write(5, "\1\0\0\0\0\0\0\0", 8) = 8
write(7, "\1\0\0\0\0\0\0\0", 8) = 8
futex(0x7f2794eeeb80, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7ffcf7c1af00, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
write(7, "\1\0\0\0\0\0\0\0", 8) = 8
futex(0x55f8143690c0, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
futex(0x55f814369070, FUTEX_WAKE_PRIVATE, 1) = 0
write(7, "\1\0\0\0\0\0\0\0", 8) = 8
futex(0x7f2794eeeb80, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7ffcf7c1ad80, FUTEX_WAIT_PRIVATE, 0, NULL) = 0
write(7, "\1\0\0\0\0\0\0\0", 8) = 8
futex(0x7f2794eeeb80, FUTEX_WAKE_PRIVATE, 1) = 1
futex(0x7ffcf7c1ad80, FUTEX_WAIT_PRIVATE, 0, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
write(7, "\1\0\0\0\0\0\0\0", 8) = 8
futex(0x55f81438d020, FUTEX_WAIT_PRIVATE, 0, NULL
After 50 seconds gwenview starts up normally and displays the following
messages which may or may not be related to the problem:
QObject::connect: No such signal QDBusAbstractInterface::DeviceAdded(QString)
QObject::connect: No such signal
QDBusAbstractInterface::DeviceRemoved(QString)
org.kde.kdegraphics.gwenview.lib: Unresolved raw mime type "image/x-nikon-
nrw"
org.kde.kdegraphics.gwenview.lib: Unresolved raw mime type "image/x-samsung-
srw"
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