Hi! Using cygwin64 with latest updates, I got this error after running lrzip (for hours): $ lrzip -v sda.2019-apr-01.local The following options are in effect for this COMPRESSION. Threading is ENABLED. Number of CPUs detected: 4 Detected 17168990208 bytes ram Compression level 7 Nice Value: 19 Show Progress Verbose Temporary Directory set as: /tmp/ Compression mode is: LZMA. LZO Compressibility testing enabled Heuristically Computed Compression Window: 109 = 10900MB Output filename is: sda.2019-apr-01.local.lrz Warning, unable to set permissions on sda.2019-apr-01.local.lrz File size: 128035676160 Will take 12 passes Beginning rzip pre-processing phase Beginning rzip pre-processing phase Beginning rzip pre-processing phase Beginning rzip pre-processing phase Beginning rzip pre-processing phase Beginning rzip pre-processing phase Beginning rzip pre-processing phase Beginning rzip pre-processing phase Beginning rzip pre-processing phase pthread_createResource temporarily unavailable Fatal error - exiting There is a created file with size 26401988882 and name sda.2019-apr-01.local.lrz in the same folder, after the crash. Googling that error line find only one case: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=623745 It is from year 2011 and is supposedly patched. The $PWD is /cygdrive/z/tmp which is a CIFS/SMB mount from a my NAS. Regards, David