Date: Tue, 17 Jan 2012 00:31:43 GMT From: "C. P. Ghost" <cpghost@cordula.ws> To: freebsd-gnats-submit@FreeBSD.org Subject: sparc64/164226: Data corruption on 9.0-RELEASE when reading from CDROM Message-ID: <201201170031.q0H0VhqN062955@red.freebsd.org> Resent-Message-ID: <201201170040.q0H0e7Ur010200@freefall.freebsd.org>
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>Number: 164226 >Category: sparc64 >Synopsis: Data corruption on 9.0-RELEASE when reading from CDROM >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-sparc64 >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Tue Jan 17 00:40:07 UTC 2012 >Closed-Date: >Last-Modified: >Originator: C. P. Ghost >Release: FreeBSD 9.0-RELEASE/sparc64 >Organization: Cordula's Web >Environment: FreeBSD tarazed.cordula.ws 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Mon Jan 16 01:51:15 CET 2012 root@tarazed.cordula.ws:/usr/obj/usr/src/sys/GENERIC sparc64 >Description: It's not possible to install FreeBSD 9.0-RELEASE from CDROM on a Blade 1500, because bsdinstall reports a corrupt base.txz. Investigating the issue further, revealed that the 9.0 kernel corrupts data read from a CDROM mounted via /dev/cd0, while the 8.2 kernel doesn't corrupt data when the CDROM is mounted via /dev/acd0. >How-To-Repeat: 8.2-RELEASE doesn't exhibit the bug: 1. Install 8.2-RELEASE on a sun4u system. 2. Mount the 9.0-RELEASE CDROM (using /dev/acd0) 3. cd /cdrom/usr/freebsd-dist; sha256 *.txz; 4. compare with MANIFEST -> same checksums. Upgrade to 9.0-RELEASE, e.g. from source: 4. mv /usr/src /usr/src.82 5. cd /; tar -xvpf /cdrom/usr/freebsd-dist/src.txz 6. source upgrade from 8.2 to 9.0 9.0-RELEASE exhibits the problem: 7. Reboot to 9.0-RELEASE 8. Mount the 9.0-RELEASE CDROM (using /dev/cd0) 9. cd /cdrom/usr/freebsd-dist; sha256 *.txz 10. compare checksums with MANIFEST -> different checksums! Reboot 9.0 userland to 8.2 (/boot/kernel.old/kernel) and repeat sha256 checksums -> no errors. Note, the sha256 program on 9.0 yields the same checksums on arbitrary files than on 8.2, as long as those files are not read from CDROM (e.g. fetched from the net). It is okay. >Fix: No fix known yet. Workaround: netboot 9.0, or source-upgrade from a previous release. Don't use CDROM (/dev/cd0) on 9.0 until this bug is fixed. >Release-Note: >Audit-Trail: >Unformatted:
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