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...nitialized variable (reproducibly) was holding the value 7, which corresponded to the file descriptor of the write end of the pipe the second child would use to send its results to the master. Hence, the child unintentionally closed this pipe directly after fork in close_fds_child_ci() resulting in sendMaster() later failing with EBADF. It was fixed with this commit: https://github.com/wch/r-source/commit/e08cffac1c5b9015a1625938d568b648eb1d8aee Regards, Andreas 2019-11-28 13:54 GMT+01:00 Andreas Kersting<r-devel at akersting.de>: > Hi Tomas, > > I rebuild R (v3.5.2 for now, R-dev...

...nitialized variable (reproducibly) was holding the value 7, which corresponded to the file descriptor of the write end of the pipe the second child would use to send its results to the master. Hence, the child unintentionally closed this pipe directly after fork in close_fds_child_ci() resulting in sendMaster() later failing with EBADF. It was fixed with this commit: https://github.com/wch/r-source/commit/e08cffac1c5b9015a1625938d568b648eb1d8aee Regards, Andreas 2019-11-28 13:54 GMT+01:00 Andreas Kersting<r-devel at akersting.de>: > Hi Tomas, > > I rebuild R (v3.5.2 for now, R-dev...

...ting wrote: >>> Hi again, >>> >>> One important correction of my first message: I misinterpreted the output. Actually in that R session 2 input files were processed one after the other in a loop. The first (with 88 parts went fine). The second (with 85 parts) produced the sendMaster errors and failed. If (in a new session via Rscript) I only process the second input file it will work. The other observations on R vs Rscript, NFS share etc. still hold. >>> >>> Sorry for this! Regards, >>> Andreas >>> >>> 2019-11-27 12:10 GMT+01:00...