Allow vfork

src/Common/ShellCommand.cpp

@@ -155,12 +155,17 @@ std::unique_ptr<ShellCommand> ShellCommand::executeImpl(
 {
     logCommand(filename, argv);
 
+#if !defined(USE_MUSL)
     /** Here it is written that with a normal call `vfork`, there is a chance of deadlock in multithreaded programs,
       *  because of the resolving of symbols in the shared library
       * http://www.oracle.com/technetwork/server-storage/solaris10/subprocess-136439.html
       * Therefore, separate the resolving of the symbol from the call.
       */
     static void * real_vfork = dlsym(RTLD_DEFAULT, "vfork");
+#else
+    /// If we use Musl with static linking, there is no dlsym and no issue with vfork.
+    static void * real_vfork = reinterpret_cast<void *>(&vfork);
+#endif
 
     if (!real_vfork)
         throwFromErrno("Cannot find symbol vfork in myself", ErrorCodes::CANNOT_DLSYM);