Hello, It seems that after commit 72b0094f9182 ("tcp: switch tcp_clock_ns() to CLOCK_TAI base") some systems that use nfs over tcp fail to boot. The last line printed in the log is from systemd: [ 7.232579] systemd[1]: System time before build time, advancing clock. Superficially it looks like very large clock discontinuities now break TCP. Maybe boottime could avoid such issues? I didn't find similar reports anywhere else. The machines I’m seeing this are all 32bit arm imx (this shouldn’t matter) and it seems their RTC isn’t properly setup so they boot with realtime set to unix zero, then a ~50 years jump happens when systemd starts up. This is the likely trigger for this issue. -- Regards, Leonard