Re: [Bugme-new] [Bug 8479] New: gettimeofday returning 1000000 in tv_usec on core2duo

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Andrew Morton wrote:
On Tue, 15 May 2007 08:06:52 +0200 Eric Dumazet <[email protected]> wrote:

Andrew Morton a écrit :
On Mon, 14 May 2007 21:17:47 -0700 [email protected] wrote:

http://bugzilla.kernel.org/show_bug.cgi?id=8479

           Summary: gettimeofday returning 1000000 in tv_usec on core2duo
    Kernel Version: 2.6.21
            Status: NEW
          Severity: normal
             Owner: [email protected]
         Submitter: [email protected]


Most recent kernel where this bug did *NOT* occur: 2.6.20
Distribution: Gentoo
Hardware Environment: core2duo T7200 (all reporters had this same CPU)
Software Environment: Linux 2.6.21, glibc 2.5
Problem Description:

gettimeofday returns 1 - 1000000 in tv_usec, not 0 - 999999 This does not happen on any of my AMD-based 32 or 64 bit boxes, only on my
core2duo; I have 2 other reports of this problem, all on T7200's

Steps to reproduce:

call gettimeofday a lot.  Eventually, you'll get 1000000 returned in tv_usec. My
average is ~1 in 1000000 calls.  I've attached my test program, with output from
various boxes.  One of the other reporters tried the test program too, and got
similar output.  .config will be attached too.
err, whoops.
I remember I already hit this and corrected it

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blobdiff;f=arch/x86_64/kernel/vsyscall.c;h=dc32cef961950915fbaa185e36ab802d5f7cea3b;hp=ba330f87067996a17495f7d03466d646c718b52c;hb=c8118c6c07f2edfd697aaa0b93e08c3b65a5a675;hpb=272a3713bb9e302e0455c894c41180a482d2c8a3

Oh, OK.

Maybe a stable push is necessary ?

yup.  Please always think of -stable when preparing fixes.  I'm sure many
useful fixes are slipping past simply because those who _are_ looking out
for backportable fixes are missing things.

That makes me feel better, I have been occasionally suggesting fixes posted here as candidates for stable, I was afraid I was being a PITA. I forgot about the "stable" address and have been bugging greg, I'll stop that.

Greg, Chris: please consider c8118c6c07f2edfd697aaa0b93e08c3b65a5a675
for -stable, if it isn't already there.


--
Bill Davidsen <[email protected]>
  "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot

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