mvw@eurtrx.UUCP (Maarten van Wijk) (07/26/88)
Hi, I am running Ultrix-32 2.2 and when I shut the system down to single user the system sometimes panics with panic: km_free: bad dealloc Digital telephone support says this is a known problem in 2.0 but has been fixed in 2.2. Is anybody else running 2.2 having this trouble? -- ***--*--*--------------------Maarten van Wijk--------------------------------+ ** * *KUB-University Phone: (+31) 13 662091 Bitnet: mvw@htikub5 | * * * Tilburg-Netherlands UUCP: ...!mcvax!kubix!mvw Surfnet: kubix::mvw | +-*--*-----------------------------------------------------------------------+
fuat@cunixc.cc.columbia.edu (Fuat C. Baran) (07/30/88)
In article <50690@felix.UUCP> mvw@eurtrx.UUCP (Maarten van Wijk) writes: >I am running Ultrix-32 2.2 and when I shut the system down to single user >the system sometimes panics with > >panic: km_free: bad dealloc > >Digital telephone support says this is a known problem in 2.0 but has >been fixed in 2.2. Is anybody else running 2.2 having this trouble? I just received the release notes for Ultrix 2.3. Page 2-3 of the release notes says: "Changes in the accounting state could cause several different system panics; for example, a km_free: bad dealloc message when shutting down system down. These panics have been eliminated." In other words, the problem exists in an unpatched 2.2 system. You might be able to get a patch for this problem. --Fuat -- ARPANET: fuat@columbia.edu U.S. MAIL: Columbia University BITNET: fuat@cunixc.cc.columbia.edu Center for Computing Activities USENET: ...!rutgers!columbia!cunixc!fuat 712 Watson Labs, 612 W115th St. PHONE: (212) 280-5128 New York, NY 10025
peirce@gumby.cc.wmich.edu (Leonard J. Peirce) (07/30/88)
In article <50690@felix.UUCP>, mvw@eurtrx.UUCP (Maarten van Wijk) writes: > > I am running Ultrix-32 2.2 and when I shut the system down to single user > the system sometimes panics with > > panic: km_free: bad dealloc The problem is with accounting. Shut it off by commenting out the /etc/accton line in /etc/rc and it should clear it up. Apparently, when accounting is running, there is a race condition produced when the system shuts down to single-user that causes it to try to deallocate some memory that has already been deallocated. DEC sent out a patch a while back but it didn't help. I notified them and they sent another patch which I have yet to install; I'll probably just wait until the next version of Ultrix comes out. BTW, any of the Ultrix sites out there that wonder why Internet mail and ftp doesn't work so hot, it could be that the TCP_TTL value is too low. It is 15 on Ultrix 2.2 and it should be 60 according to RFC 793. Talk to your DEC rep and see if he can talk someone into giving you a patch (or edit the file /usr/include/netinet/tcp_timer.h and rebuild if you have sources). We patched ours and it helped tremendously. -- Leonard J. Peirce Internet: peirce@gumby.cc.wmich.edu Western Michigan University peirce@gw.wmich.edu Academic Computer Center Voice: (616) 387-5430 Kalamazoo, MI 49008