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Bug 1355 – Problems when uploading files from symlinked location (such as deduplicated drive)

: Core
: 5.12 beta
: Bug
: Medium
: 0
: RESOLVED
: FIXED
: 5.14
https://winscp.net/forum/viewtopic.php?t=15754
Emails with Tyson B. Domer in August-September 2015.
The problem is that GetFileAttributes WinAPI function randomly fails for some files in a symlinked path. For the same two consecutive API calls the function produce a different results.
The problem manifests as "A call to an OS function failed".
Workaround implemented.
The problem was not in WinSCP, but was newly introduced due to a code refactoring in WinSCP 5.12.
Mainly by Commit 5cba2a56