Date: Fri, 23 Mar 2001 17:28:02 -0800 (PST) From: Matt Dillon <dillon@earth.backplane.com> To: Dave Tweten <tweten@nas.nasa.gov> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: 4.3-RC Kernel Buffer Corruption (Was: 4.3-BETA makeworld of current STABLE Fails) Message-ID: <200103240128.f2O1S2V87488@earth.backplane.com> References: <200103232356.f2NNuq601634@gilmore.nas.nasa.gov>
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: FreeBSD 4.3-RC (FLOATER) #2: Thu Mar 22 23:19:11 PST 2001
:
:and installed it, I tried to buildworld again. As before, it stopped in
:"stage 4: building libraries." As before, the stopper was source file
:(/usr/src/lib/libc/stdio/setvbuf.c) corruption in kernel buffers by binary
:garbage. It started on a 1024-byte boundary (4096 bytes in) and extending for
:1024 bytes. Again, the file itself was not corrupted.
:
:For review, Floater is an NEC Versa 6050MX with 48 megabytes of main memory
:and 2 4-Gig disk drives. A kernel I built on February 16 is the last one that
:doesn't exhibit buffer corruption. The problem has been consistent across a
:previous kernel config file and the current one.
:
:The previous config file fell victim to my blowing away all of /usr/src and
:re-cvsupping before I realized that the corruption wasn't on the disk. This
:explanation is by way of saying that the attached config file is a work in
:progress, but it couldn't have caused the identical buffer corruption observed
:with its predecessor. As a kicker, the previous config file was used to build
:the February 16 kernel that works.
:
:I'd call this a release show-stopper.
A bunch of questions:
* Is the corruption in the same file every time you try the buildworld?
* Is the corruption at the same offset/length?
* How are you monitoring the corruption? ktrace? cat? vi?
* How definitive a kernel -stable date can you lock the corruption
down at? Judging from this and prior messages, somewhere between
Feb16 and Mar1 ?
* Do you have softupdates enabled? If so, try turning them off.
* Are you using any special sysctl's ?
-Matt
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