Bug number: FB20072274 Title: (SMB Disconnect Causes macOS Disk I/O Call open () to Hang for 10 Minutes). You may have already gotten this through bug feedback, but this is actually a side effect of how the volume was mounted. The default when mounting through mount_smbfs is a hard mount which, among other things, ends up using the default response timeout (~10 min). However, you can also mount as a soft mount: mount_smbfs -o soft …at which point syscalls should fail after ~1 min. Soft mount is what the Finder uses (which is why this hadn't come up before), however, if you were mixing mount_smbfs and Finder mounts to the same server. I think the behavior here might actually come from the session itself (not necessarily the individual mount), in which case an existing mount_smbfs might alter the behavior of the Finder mount. Note that this could also be overridden using forcenewsession on the mount. __ Kevin Elliott DTS Engineer, CoreOS/Hardware
Topic:
App & System Services
SubTopic:
Core OS
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