Dave Greve, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com /daily-live/current/ .
If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report: apport-collect -p linux <replace-with-bug-number> Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags: kernel-fixed-upstream kernel-fixed-upstream-VERSION-NUMBER where VERSION-NUMBER is the version number of the kernel you tested. For example: kernel-fixed-upstream-v3.11-rc5 This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag: needs-upstream-testing If the mainline kernel does not fix this bug, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-VERSION-NUMBER As well, please remove the tag: needs-upstream-testing Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding. ** Tags added: bios-outdated-a16 ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/918312 Title: Imprecise instruction pointer for 64bit SIGSEGV Status in “linux” package in Ubuntu: Incomplete Bug description: The instruction pointer passed to a SIGSEGV handler following a (long int) write to a protected memory region appears to be imprecise. In particular, it appears to point to the previous instruction. This does not appear to be the case for a similar (int) write. I have attached a small test program to illustrate this problem. Below I have included a copy of the output of the test program that illustrates what I am seeing. Note that the offending instruction location is identified to the handler as 0x400ea9 but the offending instruction lives at 0x400eaa. The test program requires the library package "libdisasm0" to compile. Start of protected memory : 0x1537000 Disassembly starting at llabel: 0x400ea5 : dec eax (1) 0x400ea6 : mov eax, [ebp-0x38] (3) 0x400ea9 : dec eax (1) 0x400eaa : mov [eax], 0x0000000D (6) 0x400eb0 : call 0xFFFFFB13 (5) 0x400eb5 : mov edi, 0x00000000 (5) 0x400eba : call 0xFFFFFA93 (5) 0x400ebf : nop (1) 0x400ec0 : repz ret (2) SIGSEGV at address : 0x1537000 Disassembly starting at offending instruction : pc = 0x400ea9 0x400ea9 : dec eax (1) 0x400eaa : mov [eax], 0x0000000D (6) 0x400eb0 : call 0xFFFFFB0F (5) 0x400eb5 : mov edi, 0x00000000 (5) 0x400eba : call 0xFFFFFA8F (5) 0x400ebf : nop (1) 0x400ec0 : repz ret (2) ProblemType: Bug DistroRelease: Ubuntu 10.04 Package: linux-generic 2.6.32.37.43 Regression: No Reproducible: Yes ProcVersionSignature: Ubuntu 2.6.32-37.81-generic 2.6.32.49+drm33.21 Uname: Linux 2.6.32-37-generic x86_64 NonfreeKernelModules: nvidia AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.21. Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog] Subdevices: 2/2 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: dagreve 4377 F.... pulseaudio CRDA: Error: [Errno 2] No such file or directory Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xf7ffc000 irq 16' Mixer name : 'Analog Devices AD1984A' Components : 'HDA:11d4194a,1028026d,00100400' Controls : 34 Simple ctrls : 20 Date: Wed Jan 18 11:11:26 2012 HibernationDevice: RESUME=UUID=f389f9ee-5683-4f5b-9a5f-1864f8e45b1f InstallationMedia: Ubuntu 10.04.2 LTS "Lucid Lynx" - Release amd64 (20110211.1) IwConfig: lo no wireless extensions. eth0 no wireless extensions. MachineType: Dell Inc. Precision WorkStation T7500 ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-37-generic root=UUID=08095835-1692-4b9c-8f85-e9b81988317c ro quiet splash ProcEnviron: SHELL=/bin/bash PATH=(custom, user) LANG=en_US.UTF-8 RelatedPackageVersions: linux-firmware 1.34.7 RfKill: SourcePackage: linux dmi.bios.date: 10/08/2010 dmi.bios.vendor: Dell Inc. dmi.bios.version: A07 dmi.board.name: 06FW8P dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 7 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA07:bd10/08/2010:svnDellInc.:pnPrecisionWorkStationT7500:pvr:rvnDellInc.:rn06FW8P:rvrA01:cvnDellInc.:ct7:cvr: dmi.product.name: Precision WorkStation T7500 dmi.sys.vendor: Dell Inc. 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