Smoke [5.11.0] 34836 FAIL(F) MSWin32 WinXP/.Net SP3 (x86/2 cpu)

Automated smoke report for 5.11.0 patch 34836
maldoror.bath.planit.group: Intel(R) Core(TM)2 CPU 6700 @ 2.66GHz(~2660 MHz) (x86/2 cpu)
    on        MSWin32 - WinXP/.Net SP3
    using     cl version 15.00.21022.08
    smoketime 5 hours 48 minutes (average 17 minutes 27 seconds)

Summary: FAIL(F)

O = OK  F = Failure(s), extended report at the bottom
X = Failure(s) under TEST but not under harness
? = still running or test results not (yet) available
Build failures during:       - = unknown or N/A
c = Configure, m = make, M = make (after miniperl), t = make test-prep

34836 Configuration (common) -DCCTYPE=MSVC90 -DINST_TOP=$(INST_DRV)\Smoke\doesntexist
----------- ---------------------------------------------------------
O O         
O O         -Dusemymalloc
O O         -Duselargefiles
O O         -Duselargefiles -Dusemymalloc
O O         -Duseithreads -Uuseimpsys
O O         -Duseithreads -Uuseimpsys -Dusemymalloc
O O         -Duseithreads -Uuseimpsys -Duselargefiles
O O         -Duseithreads -Uuseimpsys -Duselargefiles -Dusemymalloc
O O         -Duseithreads
F O         -Duseithreads -Duselargefiles
| +--------- -DDEBUGGING
+----------- no debugging


Locally applied patches:
    DEVEL
    SMOKE34836

Failures: (common-args) -DCCTYPE=MSVC90 -DINST_TOP=$(INST_DRV)\Smoke\doesntexist
[default] -Duseithreads -Duselargefiles
../ext/IO/t/io_sock.t.......................................FAILED
../ext/PerlIO/t/ioleaks.t...................................FAILED

Compiler messages(MSWin32):
Cwd.xs(77) : warning C4101: 'symlink' : unreferenced local variable