Trying to write to SMB share crashes network stack.

MacBook Pro (15-inch, 2018)

MacOs 11.0.1

Share is working perfectly when connected from iPhone or Bootcamp. It was working on Catalina.

Since updated to Big Sur reading from share works like before, but when trying to write anything - progress hangs at initial 0 bytes and it's followed by share disconnect and network connection crashing (cannot ping to anything, yet WiFi looks like connected - when trying to switch to another network it's connecting indefinitely). Only restart helps.

Writing to SMB is working via CURL, but cannot just copy files in finder.

I also cannot find any relevant error in Console - except those about inability to resolve DNS addresses after network stack becomes dead.

MacBook Pro 15″, macOS 11.0

Posted on Nov 27, 2020 4:48 PM

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1 reply

Ben---

Level 1

19 points

Dec 14, 2020 7:39 PM in response to filipsworks

Hi filipsworks, is your SMB share running on a server with Samba? This may be related to a known bug where 0 bytes files are created and the connection to the share stops working. To fix this you have to explicitly set "fruit:zerofileid = yes" in your smb.conf even though it's supposed to be on by default (See https://bugzilla.samba.org/show_bug.cgi?id=14420). Make sure you have the Samba best practices for working with macOS configured (https://wiki.samba.org/index.php/Configure_Samba_to_Work_Better_with_Mac_OS_X).

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Trying to write to SMB share crashes network stack.