http://www.randombugs.com Just another Bastard Operator From Hell. Everything from *nix to programming Thu, 05 Jan 2012 11:44:55 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 http://www.randombugs.com/java/sunjvmhotspotdebuggernosuchsymbolexception-find-symbol-ghotspotvmtypeentrytypenameoffset.html http://www.randombugs.com/java/sunjvmhotspotdebuggernosuchsymbolexception-find-symbol-ghotspotvmtypeentrytypenameoffset.html#comments Tue, 08 Feb 2011 14:33:58 +0000 admin http://www.randombugs.com/?p=676
This, probably, is a bug which was not spotted very often because is very obscure and the Debian guys moved very quick and fixed the problem. I know, I found a lot of bugs related to sun.jvm.hotspot.debugger.NoSuchSymbolException: Could not find symbol “gHotSpotVMTypeEntryTypeNameOffset”, but this is different. Usually was a problem of “striping symbols from libjvm.so”, but in my case wasn’t that. Also I found this error related to OpenJDK (I use Sun JDK) and the solution was to use -server flag to get the correct libjvm.so. Anyway it took me ...]]> http://www.randombugs.com/java/sunjvmhotspotdebuggernosuchsymbolexception-find-symbol-ghotspotvmtypeentrytypenameoffset.html/feed 1 http://www.randombugs.com/linux/patching-linux-kernel-rebooting.html http://www.randombugs.com/linux/patching-linux-kernel-rebooting.html#comments Thu, 12 Mar 2009 15:23:45 +0000 admin http://www.randombugs.com/?p=268
I think, everyone from Linux industry, knows about kexec (fast rebooting ... actually not rebooting just switching kernels) or Pannus (live kernel patching, but right now the project is dead) and their use. The Linux community started very earlier to think at a method to switch or patch a live kernel, but this things should work only on a very good kernel with very good memory and process isolation ... but this was achieved some time ago, we have a very good and mature Linux kernel (in my opinion was perfect from 2.4.2x) what can run for years without a reboot (my record is 4 years on a system with kernel 2.6.8 and this kernel is far to be perfect). This days I found a tool what is a gold mine for system administrators : KSplice. ]]> http://www.randombugs.com/linux/patching-linux-kernel-rebooting.html/feed 1 http://www.randombugs.com/hacker/chkrootkit-debian-ubuntu.html http://www.randombugs.com/hacker/chkrootkit-debian-ubuntu.html#comments Mon, 09 Mar 2009 13:32:09 +0000 admin http://www.randombugs.com/?p=244
When we auditing a Linux system we have a lot of good tools to monitor unexpected changes and unexpected behaviour of a system. Earlier we talked about rkhunter as a system check for rootkits and now, as an alternative, we will talk about chkrootkit (Determine whether the system is infected with a rootkit). If you want to know a definition of what is a rootkit please read the first article about rkhunter. chkrootkit is a freesoftware what is work with Linux, FreeBSD, OpenBSD, NetBSD, Solaris, HP-UX 11, Tru64, BSDI and Mac ...]]> http://www.randombugs.com/hacker/chkrootkit-debian-ubuntu.html/feed 0 http://www.randombugs.com/linux/rebooting-kernel-panic.html http://www.randombugs.com/linux/rebooting-kernel-panic.html#comments Wed, 04 Mar 2009 13:24:54 +0000 admin http://www.randombugs.com/?p=205
By default, a Linux, is waiting direct input of a person / sysadmin when is crashing with kernel panic/oops. Obviously is very important to know or to see directly the dumped screen, but sometimes in production environments is better just to reboot itself without any intervention and debug the problem with the system online. Off course for debugging and seeing the dump you will need to install and configure kdump, but that is another story (I will probably write about that soon). Anyway to set your system to reboot after 1 ...]]> http://www.randombugs.com/linux/rebooting-kernel-panic.html/feed 0 http://www.randombugs.com/linux/vmware-251-bug-ubuntu-904.html http://www.randombugs.com/linux/vmware-251-bug-ubuntu-904.html#comments Tue, 02 Dec 2008 14:01:57 +0000 admin http://www.randombugs.com/?p=112
I just upgraded to Ubuntu 9.04 with kernel 2.6.27-10-generic. After upgrade I wanted to reconfigure my old VMware player 2.4.x but no success because the kernel was changed a lot from version 2.6.18 to 2.6.27, so I was “forced” to switch to VMWare Player 2.5.1. Installing was easy but configuring the new modules for the VMware player was not working at all. After some debugging I just found the vmware-modconfig crashing with “Segmentation Fault”. $dmesg [ 4398.256991] vmware-modconfi[29788]: segfault at 0 ip 00007f8b5617bb84 sp 00007fff5f566280 error 4 in libc-2.9.so[7f8b560fa000+168000 I tried to fix ...]]> http://www.randombugs.com/linux/vmware-251-bug-ubuntu-904.html/feed 3 http://www.randombugs.com/linux/ora-27125-unable-to-create-shared-memory-segment.html http://www.randombugs.com/linux/ora-27125-unable-to-create-shared-memory-segment.html#comments Tue, 11 Nov 2008 09:30:51 +0000 admin http://www.randombugs.com/?p=25
This post is for the users who got this error message (ORA-27125: unable to create shared memory segment) when they try to run Oracle 10g on linux. Are 2 solutions for this problem: 1. Disable Huge TLB tables export DISABLE_HUGETLBFS=1 in shell and after just restart oracle. (Take care because you will need a lot of RAM if you disable HUGETLBFS) 2. You need to recompile your linux kernel with following options enabled CONFIG_HUGETLB_PAGE=y CONFIG_HUGETLBFS=y I hope this post will be helpful. Related Posts:How to disable the display standby on a xorg xserverSpeed up Samba under LinuxCore dumps under ...]]> http://www.randombugs.com/linux/ora-27125-unable-to-create-shared-memory-segment.html/feed 1