Awatmath.1301 net.bugs.4bsd utzoo!decvax!watmath!arwhite Wed Dec 16 14:42:37 1981 Multiplexor bugs This bug causes a gp to be treated as a cp and a crash may result if you do a NPGRP or CSIG in error on a group rather than channel (or as I found it; by passing -1 as the channel number!) -------mx1.c--------- 417c417 c_flags&ISGRP) { --- > if (cp==NULL) { 434c434 c_flags&ISGRP) { --- > if (cp==NULL) { If you have an old multiplexor inode sitting around from before a real crash, then the return of the null group[d] value will be carefully checked in mxopen which will return - unfortunately not having set u.u_error - thus the channel is actually returned as opened, but no tables have been set up! SYMPTOMS: System crashes. On the way back up there is an attempt to preserve editor files - which invokes mail to notify you it has done so. Mail trys to open /dev/mail to send you notice. comsat is not yet up; /dev/mail is from before the crash; and the system crashes in the close after successfully openingit -------mx2.c--------- 45c45 = NGROUPS || groups[d] == NULL) { --- > if (d >= NGROUPS) { ----------------------------------------------------------------- gopher://quux.org/ conversion by John Goerzen of http://communication.ucsd.edu/A-News/ This Usenet Oldnews Archive article may be copied and distributed freely, provided: 1. There is no money collected for the text(s) of the articles. 2. The following notice remains appended to each copy: The Usenet Oldnews Archive: Compilation Copyright (C) 1981, 1996 Bruce Jones, Henry Spencer, David Wiseman.