Here is another strace log, for gnome-calculator. It pauses at line 3755:
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3738 [pid 10510] poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
3739 [pid 10510] poll([{fd=5, events=POLLIN}], 1, 0) = 1 ([{fd=5,
revents=POLLIN}])
3740 [pid 10510] recvmsg(5, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="l\2\1\1\0\0\0\0\n\0\0\0005\0\0\0", iov_len=16}],
msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG
_CMSG_CLOEXEC) = 16
3741 [pid 10510] poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
3742 [pid 10510] poll([{fd=5, events=POLLIN}], 1, 0) = 1 ([{fd=5,
revents=POLLIN}])
3743 [pid 10510] recvmsg(5, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\6\1s\0\6\0\0\0:1.343\0\0\5\1u\0\t\0\0\0\7\1s\0\24\0\0\0"...,
iov_len=56}], msg_iovlen=1, msg_controllen=0, msg_f
lags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 56
3744 [pid 10510] poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
3745 [pid 10510] poll([{fd=5, events=POLLIN}], 1, 0) = 1 ([{fd=5,
revents=POLLIN}])
3746 [pid 10510] recvmsg(5, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="l\2\1\1\0\0\0\0\v\0\0\0005\0\0\0", iov_len=16}],
msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG
_CMSG_CLOEXEC) = 16
3747 [pid 10510] poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
3748 [pid 10510] poll([{fd=5, events=POLLIN}], 1, 0) = 1 ([{fd=5,
revents=POLLIN}])
3749 [pid 10510] recvmsg(5, {msg_name=NULL, msg_namelen=0,
msg_iov=[{iov_base="\6\1s\0\6\0\0\0:1.343\0\0\5\1u\0\n\0\0\0\7\1s\0\24\0\0\0"...,
iov_len=56}], msg_iovlen=1, msg_controllen=0, msg_f
lags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 56
3750 [pid 10510] poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout)
3751 [pid 10510] poll([{fd=5, events=POLLIN}], 1, 0) = 0 (Timeout)
3752 [pid 10510] write(6, "\1\0\0\0\0\0\0\0", 8) = 8
3753 [pid 10510] poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, -1) =
1 ([{fd=6, revents=POLLIN}])
3754 [pid 10510] read(6, "\1\0\0\0\0\0\0\0", 16) = 8
3755 [pid 10510] poll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, -1
<unfinished ...>
3756 [pid 10508] <... poll resumed> ) = 0 (Timeout)
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gnome-calculator-startup.log.xz
Description: Binary data
