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If the provided test package fixes the issue. Then we would like to fix this crash bug in the next zstream release. The change is only changing the parent memory context where the share mode lock is allocated. We should use the fsp (file struct pointer) as it is long lived and we free the lock anyway.

Workaround:

Set 'max stat cache size = 1024' in the [global] section of the smb.conf!

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (samba bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:0855