From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM autolearn=unavailable autolearn_force=no version=3.4.4 X-Received: by 10.70.91.173 with SMTP id cf13mr36137180pdb.7.1430697634583; Sun, 03 May 2015 17:00:34 -0700 (PDT) X-Received: by 10.50.23.108 with SMTP id l12mr106874igf.16.1430697634547; Sun, 03 May 2015 17:00:34 -0700 (PDT) Path: border1.nntp.dca1.giganews.com!border2.nntp.dca1.giganews.com!nntp.giganews.com!l13no13487669iga.0!news-out.google.com!kd3ni7421igb.0!nntp.google.com!m20no8179170iga.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail Newsgroups: comp.lang.ada Date: Sun, 3 May 2015 17:00:33 -0700 (PDT) In-Reply-To: <1vbdka5a8rqlm8vimai2egm5v1m133pobg@4ax.com> Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=123.2.70.40; posting-account=S_MdrwoAAAD7T2pxG2e393dk6y0tc0Le NNTP-Posting-Host: 123.2.70.40 References: <201505021834588468-rblove@airmailnet> <9f20f713-d65c-471d-ab7c-d314a14fdcd0@googlegroups.com> <1vbdka5a8rqlm8vimai2egm5v1m133pobg@4ax.com> User-Agent: G2/1.0 MIME-Version: 1.0 Message-ID: Subject: Re: Boeing 787 integer overflow From: robin.vowels@gmail.com Injection-Date: Mon, 04 May 2015 00:00:34 +0000 Content-Type: text/plain; charset=ISO-8859-1 Xref: number.nntp.giganews.com comp.lang.ada:193017 Date: 2015-05-03T17:00:33-07:00 List-Id: On Monday, May 4, 2015 at 9:34:59 AM UTC+10, Dennis Lee Bieber wrote: > On Sun, 3 May 2015 12:03:51 -0400, Peter Chapin > declaimed the following: > > >I guess it depends on if there is a *requirement* to reboot the system > >periodically (less than 8 months) in the maintenance plan. The matter > >should be handled somewhere and it seems like it wasn't. In other words it > >was just "luck" that these systems have been getting restarted frequently > >enough. > > > Also depends upon just what "reboot" means in this environment... If > this is some sort of elapsed time counter, then it is something saved in > flash memory and will survive a normal power-cycle operation. The article has pointed out that 248 days corresponds to 2**31 centiseconds, which suggests that the integer is associated with a timer that is running continuously. Timers usually have a lithium battery to keep them going, just as they do in the humble PC. > "Reboot" in this case may mean erasing and reloading the operational > flight program, databases, and other stuff in "permanent" memory. Reboot of the humble PC doesn't usually change the timer's value.