lseek/write suddenly returns -1 with errno = 9 (Bad file descriptor)

I don’t know what type of setup you have, but the following scenario, could I think produce such an effect (or else one similar to it). I have not tested this to verify, so please take it with a grain of salt.

If the file/device you are opening implemented as a server application (eg NFS), consider what could happen if the server application goes down / restarts / reboots. The file descriptor though originally valid at the client end might no longer map to a valid file handle at the server end. This can conceivably lead to a sequence of events wherein the client will get EBADF.

Hope this helps.

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