--- /dev/null
+commit 3e3ae40f053b22fbb9bef50067d6edad4c358c4c
+Author: Mirko Vogt <dev@nanl.de>
+Date: Tue May 24 14:36:42 2011 +0200
+
+ use 'fputws_unlocked(S,F)' instead of 'fputws(S,F)'
+
+ this eliminates a source of reproduceable freezes
+
+diff --git a/libc/stdio/_vfprintf.c b/libc/stdio/_vfprintf.c
+index 3db8cdf..069db16 100644
+--- a/libc/stdio/_vfprintf.c
++++ b/libc/stdio/_vfprintf.c
+@@ -1229,7 +1229,7 @@ static size_t _fp_out_narrow(FILE *fp, intptr_t type, intptr_t len, intptr_t buf
+ #define STRLEN wcslen
+ #define _PPFS_init _ppwfs_init
+ /* Pulls in fseek: */
+-#define OUTPUT(F,S) fputws(S,F)
++#define OUTPUT(F,S) fputws_unlocked(S,F)
+ /* TODO: #define OUTPUT(F,S) _wstdio_fwrite((S),wcslen(S),(F)) */
+ #define _outnwcs(stream, wstring, len) _wstdio_fwrite((const wchar_t *)(wstring), len, stream)
+ #define FP_OUT _fp_out_wide