Hi Christophe, If there is no space (' ') in callout strings, the callout isn't called in multipath-tools-0.4.4. For example, in the default multipath.conf, default_prio_callout is set as "/bin/false". But it's not called due to this bug. If I set it as "/bin/false ", it works. Regards, Ky (Kiyoshi Ueda) --- multipath-tools-0.4.4/libmultipath/callout.c 2005-04-14 13:17:17.000000000 -0400 +++ execute-program-fix/libmultipath/callout.c 2005-04-28 05:29:30.228646923 -0400 @@ -29,8 +29,8 @@ int execute_program(char *path, char *va int i; i = 0; + strfieldcpy(arg, path); if (strchr(path, ' ')) { - strfieldcpy(arg, path); pos = arg; while (pos != NULL) { if (pos[0] == '\'') { @@ -39,11 +39,13 @@ int execute_program(char *path, char *va argv[i] = strsep(&pos, "\'"); while (pos[0] == ' ') pos++; - } else { + } else { argv[i] = strsep(&pos, " "); } i++; } + } else { + argv[i++] = arg; } argv[i] = NULL;