Date: Fri, 4 Jul 2014 10:47:05 -0700 From: David Wolfskill <david@catwhisker.org> To: Hans Petter Selasky <hps@selasky.org> Cc: stable@freebsd.org Subject: Re: r268244 (stable/9) seems to break "sysctl hw.ncpu" Message-ID: <20140704174705.GS6056@albert.catwhisker.org> In-Reply-To: <53B6E218.5070009@selasky.org> References: <20140704123901.GR6056@albert.catwhisker.org> <53B6E218.5070009@selasky.org>
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--hc1Ad1NXUysMDyjB Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Jul 04, 2014 at 07:19:20PM +0200, Hans Petter Selasky wrote: > On 07/04/14 14:39, David Wolfskill wrote: > > After building & installing @r268208 (yesterday), "sysctl hw.ncpu" > > reports a number (e.g., "2" for my laptop). > > > > After building & installing @r268244 (today)... > > > > freebeast(9.3-P)[5] sysctl hw.ncpu | hd > > 00000000 68 77 2e 6e 63 70 75 3a 20 0a |hw.ncpu: .| > > 0000000a > > freebeast(9.3-P)[6] > > > > After reverting r268244, then "cd /usr/src/sbin/sysctl && make && make > > install": > > > > g1-252(9.3-P)[8] sysctl hw.ncpu | hd > > 00000000 68 77 2e 6e 63 70 75 3a 20 32 0a |hw.ncpu: > > 2.| > > 0000000b > > g1-252(9.3-P)[9] > > > > > > I note that I also track stable/10 and head (on different slices; > > daily) on the machine; haven't seen similar behavior in either > > environment. > ... >=20 > I cannot reproduce this. Using the same kernel and running sysctl from.= =20 > My patch to 9-stable will not affect printing of integers. 9-stable and= =20 > 10-stable and current "sysctl" code all gives the same result over here= =20 > with 9-stable kernel: >=20 > sysctl -n hw.ncpu | hd > 00000000 32 0a |2.| >=20 > sysctl hw.ncpu | hd > 00000000 68 77 2e 6e 63 70 75 3a 20 32 0a |hw.ncpu: 2.| >=20 > Can you tell me exactly what kernel version you are using, "uname -a"=20 > and which version of "sysctl" with which version of the kernel is=20 > failing, so that I can reproduce. >=20 > Thank you! > ... /usr/src is: g1-252(9.3-P)[1] svn info /usr/src/ Path: /usr/src Working Copy Root Path: /usr/src URL: file:///svn/freebsd/src/base/stable/9 Relative URL: ^/stable/9 Repository Root: file:///svn/freebsd/src/base Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f Revision: 268249 Node Kind: directory Schedule: normal Last Changed Author: hselasky Last Changed Rev: 268244 Last Changed Date: 2014-07-03 23:05:39 -0700 (Thu, 03 Jul 2014) g1-252(9.3-P)[2] uname -a FreeBSD g1-252.catwhisker.org 9.3-PRERELEASE FreeBSD 9.3-PRERELEASE #46 r2= 68244M/268249:903500: Fri Jul 4 04:52:48 PDT 2014 root@g1-252.catwhisk= er.org:/usr/obj/usr/src/sys/CANARY i386 g1-252(9.3-P)[3]=20 I was able to see the behavior without changing the kernel -- and indeed, I was able to run the stable/10 version of /sbin/sysctl under stable/9 without problems: g1-252(9.3-P)[3] which sysctl /sbin/sysctl g1-252(9.3-P)[4] ls -lT `!!` ls -lT `which sysctl` -r-xr-xr-x 1 root wheel 14500 Jul 4 10:35:55 2014 /sbin/sysctl g1-252(9.3-P)[5] !$ hw.ncpu | hd `which sysctl` hw.ncpu | hd 00000000 68 77 2e 6e 63 70 75 3a 20 0a |hw.ncpu: .| 0000000a g1-252(9.3-P)[6] `which sysctl.OK` hw.ncpu | hd 00000000 68 77 2e 6e 63 70 75 3a 20 32 0a |hw.ncpu: 2.| 0000000b g1-252(9.3-P)[7] /S3/sbin/sysctl hw.ncpu | hd 00000000 68 77 2e 6e 63 70 75 3a 20 32 0a |hw.ncpu: 2.| 0000000b g1-252(9.3-P)[8] file /S3/sbin/sysctl /S3/sbin/sysctl: ELF 32-bit LSB executable, Intel 80386, version 1 (FreeBSD= ), dynamically linked (uses shared libs), for FreeBSD 10.0 (1000709), strip= ped g1-252(9.3-P)[9] file /sbin/sysctl /sbin/sysctl: ELF 32-bit LSB executable, Intel 80386, version 1 (FreeBSD), = dynamically linked (uses shared libs), for FreeBSD 9.2 (902512), stripped g1-252(9.3-P)[10]=20 (Note that my stable/10 is from sources: g1-252(9.3-P)[10] svn info /S3/usr/src/ Path: /S3/usr/src Working Copy Root Path: /S3/usr/src URL: file:///svn/freebsd/src/base/stable/10 Relative URL: ^/stable/10 Repository Root: file:///svn/freebsd/src/base Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f Revision: 268249 Node Kind: directory Schedule: normal Last Changed Author: hselasky Last Changed Rev: 268243 Last Changed Date: 2014-07-03 23:03:54 -0700 (Thu, 03 Jul 2014) g1-252(9.3-P)[11]=20 FreeBSD g1-252.catwhisker.org 10.0-STABLE FreeBSD 10.0-STABLE #1267 r26820= 6M/268208:1000710: Thu Jul 3 05:27:08 PDT 2014 root@g1-252.catwhisker.= org:/common/S3/obj/usr/src/sys/CANARY i386 in case that's useful.) I tried restoring r268244, rebuilding sysctl with debugging & running it under gdb to see what was going on, but I'm a couple decades out of practice -- seems that some of the variables I wanted to print had been optimized to registers or some such thing. I'm sympathetic to the notion that the change *shouldn't* have this effect... but I have empiricist tendencies. :-} I'll be happy to experiment as time permits. (Holiday over here, so that means I work on house-maintenance.) Peace, david --=20 David H. Wolfskill david@catwhisker.org Taliban: Evil cowards with guns afraid of truth from a 14-year old girl. See http://www.catwhisker.org/~david/publickey.gpg for my public key. --hc1Ad1NXUysMDyjB Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQJ8BAEBCgBmBQJTtuiXXxSAAAAAAC4AKGlzc3Vlci1mcHJAbm90YXRpb25zLm9w ZW5wZ3AuZmlmdGhob3JzZW1hbi5uZXQ4RThEMDY4QTIxMjc1MDZFRDIzODYzRTc4 QTY3RjlDOERFRjQxOTNCAAoJEIpn+cje9Bk7zOYQAIsuXoOOlMqr34C/UPFQXrYY vuinZwpAsWW1CQaCiMtMnPbTlBnfMBlaczBfxfozBcMMhPOsPz98XGJ4H1jYfc/z f/ZbuRxtEI0VnmK5YR6Ge46Ec9JH77Av8ed4v/nFB7BF9Bio1Do2eJAarO5C+koF BeOHNjPH8HLGufj/7KF0cXLIxzONArf7VZdRUqsrCUxVDwBenq7XQpvZ/TwigUfi TrhmlV42WRmEYSIcC3yqxQa8lyqdaWc1DYTb5Gfe3WaXP+dyokNPWpT2tDf+mF1a Kzn/JpxTHgjLPiKJwGKKGNTWYjl60skuHgyzwq4cUhE2J5VUaTXYmSzgFkkXSPxE nou6uwzyG5fYIwABQE5Zf8jokC+aAmoiLf/EYwqtJEhQxubpYDD+11NvIjE5G0qM WUCrV6e7mz3R3Lg7a+G4S4qxRNbXFYANDiHDwuckBJabnPsSsO7oWzAi2CGMnf/T 7UANQRhv2pYYf5Z90CFgHWgBWD872Ozazzl7GLYSzjlyRihHav3rJi5BxPAcqEoe slqySynHf0ubIa4GfPNc/+6lfrHDGClCMYqlmJByOOLFz0srYx7vlkzKjeqHpgdE lNsD9t76cxfLNYtSbX4btfkSl/yhTUbuH8dRIr8+PnlXWZHnZvPvkboH+8p/CD/k ByJVKZuk60WbKeLDbyfl =Sr4P -----END PGP SIGNATURE----- --hc1Ad1NXUysMDyjB--
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