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commit 217a74a85cdd60df236c296ad88142b78d35eccf
Author: Andreas Schwab <schwab@suse.de>
Date: Mon Dec 8 15:13:38 2014 +0100
Don't touch user-controlled stdio locks in forked child (bug 12847)
The stdio locks for streams with the _IO_USER_LOCK flag should not be
touched by internal code.
--- glibc-2.17-c758a686/nptl/sysdeps/unix/sysv/linux/fork.c
+++ glibc-2.17-c758a686/nptl/sysdeps/unix/sysv/linux/fork.c
@@ -45,7 +45,8 @@
_IO_ITER i;
for (i = _IO_iter_begin(); i != _IO_iter_end(); i = _IO_iter_next(i))
- _IO_lock_init (*((_IO_lock_t *) _IO_iter_file(i)->_lock));
+ if ((_IO_iter_file (i)->_flags & _IO_USER_LOCK) == 0)
+ _IO_lock_init (*((_IO_lock_t *) _IO_iter_file(i)->_lock));
}