Frank Thommen added the comment:
strace gives me the error:
unlink("/mnt/tmpu817xz") = -1 EIO (Input/output error)
But after escalating the issue to our server vendor it turned out that the
problem lies in the filesystem option "nbmand". If this option is set to "on"
- which it seems to be by default on our zfs filesystems - and the filesystem
is exported and mounted with NFS v4, then tempfile.TemporaryFile fails:
[...]
V4 Call (Reply In 167) RENAME From: tmpr0OaMb To: .nfs00000000000000270000af65
V4 Reply (Call In 166) RENAME Status: NFS4ERR_FILE_OPEN
[...]
I assume that this is nothing Python can check for and therefore not a Python
problem.
Not sure what the policy is: Can I set the ticket to "solved" myself?
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<http://bugs.python.org/issue22326>
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