Thanks William!
Okay, that narrows it down:
15:52:55.802079 read(24, "l\1\0\1\n\0\0\0\10\0\0\0\207\0\0\0\1\1o\0\25\0\0\0/org/freedesktop/DBus\0\0\0\6\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\2\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0\3\1s\0\25\0\0\0GetConnectionUnixUser\0\0\0\10\1g\0\1s\0\0\5\0\0\0:1.15\0", 2048) = 162 15:52:55.802232 read(24, 0x21160a30, 2048) = -1 EAGAIN (Resource temporarily unavailable) 15:52:55.802464 writev(24, [{"l\3\1\0014\0\0\0\20\0\0\0u\0\0\0\6\1s\0\5\0\0\0:1.16\0\0\0\4\1s\0)\0\0\0org.freedesktop.DBus.Error.NameHasNoOwner\0\0\0\0\0\0\0\5\1u\0\10\0\0\0\10\1g\0\1s\0\0\7\1s\0\24\0\0\0org.freedesktop.DBus\0\0\0\0", 136}, {"/\0\0\0Could not get UID of name ':1.15': no such name\0", 52}], 2) = 188 ... 15:52:55.803074 read(24, "l\2\1\1\27\0\0\0\t\0\0\0\37\0\0\0\6\1s\0\5\0\0\0:1.15\0\0\0\5\1u\0\6\0\0\0\10\1g\0\1s\0\0\22\0\0\0udisks_inhibitor_0\0", 2048) = 71
Thanks William!
Okay, that narrows it down:
15:52:55.802079 read(24, "l\1\0\ 1\n\0\0\ 0\10\0\ 0\0\207\ 0\0\0\1\ 1o\0\25\ 0\0\0/org/ freedesktop/ DBus\0\ 0\0\6\1s\ 0\24\0\ 0\0org. freedesktop. DBus\0\ 0\0\0\2\ 1s\0\24\ 0\0\0org. freedesktop. DBus\0\ 0\0\0\3\ 1s\0\25\ 0\0\0GetConnect ionUnixUser\ 0\0\0\10\ 1g\0\1s\ 0\0\5\0\ 0\0:1.15\ 0", 2048) = 162 1\0014\ 0\0\0\20\ 0\0\0u\ 0\0\0\6\ 1s\0\5\ 0\0\0:1. 16\0\0\ 0\4\1s\ 0)\0\0\ 0org.freedeskto p.DBus. Error.NameHasNo Owner\0\ 0\0\0\0\ 0\0\5\1u\ 0\10\0\ 0\0\10\ 1g\0\1s\ 0\0\7\1s\ 0\24\0\ 0\0org. freedesktop. DBus\0\ 0\0\0", 136}, {"/\0\0\0Could not get UID of name ':1.15': no such name\0", 52}], 2) = 188 1\27\0\ 0\0\t\0\ 0\0\37\ 0\0\0\6\ 1s\0\5\ 0\0\0:1. 15\0\0\ 0\5\1u\ 0\6\0\0\ 0\10\1g\ 0\1s\0\ 0\22\0\ 0\0udisks_ inhibitor_ 0\0", 2048) = 71
15:52:55.802232 read(24, 0x21160a30, 2048) = -1 EAGAIN (Resource temporarily unavailable)
15:52:55.802464 writev(24, [{"l\3\
...
15:52:55.803074 read(24, "l\2\1\