On 2 November 2015 at 09:09, Nan Xiao <xiaonan830818(a)gmail.com&gt; wrote: > > Hi all, > > I am trying to use crash on RHEL 7.0.After executing "crash" command, > it outputs: > > crash: cannot find booted kernel -- please enter namelist argument > > After referring to crash white paper > (https://people.redhat.com/anderson/crash_whitepaper/), > I know it needs vmlinux file. So I install "kernel-debuginfo" package: > > [root@localhost boot]# rpm -ql kernel-debuginfo | grep vmlinux > /usr/lib/debug/lib/modules/3.10.0-123.el7.x86_64/vmlinux > > Then execute crash, it still prompts the same error: > > crash: cannot find booted kernel -- please enter namelist argument > > I try to copy vmlinux file into /boot directory, but this error still > exists. > > How can I fix this issue? Thanks very much in advance! > > Best Regards > Nan Xiao > > -- > Crash-utility mailing list > Crash-utility(a)redhat.com > https://www.redhat.com/mailman/listinfo/crash-utility Hi Nan, You need to make sure that the version of kernel-debuginfo package must match with the version of running kernel. Eg: # rpm -q kernel kernel-3.10.0-229.el7.x86_64 # uname -r 3.10.0-229.el7.x86_64 # rpm -q kernel-debuginfo package kernel-debuginfo is not installed # rpm -ivh kernel-debuginfo-common-x86_64-3.10.0-229.el7.x86_64.rpm Preparing... ################################# [100%] Updating / installing... 1:kernel-debuginfo-common-x86_64-3.################################# [100%] # rpm -ivh kernel-debuginfo-3.10.0-229.el7.x86_64.rpm Preparing... ################################# [100%] Updating / installing... 1:kernel-debuginfo-3.10.0-229.el7 ################################# [100%] # rpm -q kernel-debuginfo kernel-debuginfo-3.10.0-229.el7.x86_64 # crash -s crash> sys KERNEL: /usr/lib/debug/lib/modules/3.10.0-229.el7.x86_64/vmlinux DUMPFILE: /dev/crash CPUS: 2 DATE: Mon Nov 2 12:41:58 2015 UPTIME: 00:13:18 LOAD AVERAGE: 0.37, 0.37, 0.18 TASKS: 122 NODENAME: localhost.localdomain RELEASE: 3.10.0-229.el7.x86_64 VERSION: #1 SMP Thu Jan 29 18:37:38 EST 2015 MACHINE: x86_64 (2790 Mhz) MEMORY: 2 GB -- BKS -- Crash-utility mailing list Crash-utility(a)redhat.com https://www.redhat.com/mailman/listinfo/crash-utility

On 2 November 2015 at 12:56, Nan Xiao <xiaonan830818(a)gmail.com&gt; wrote: > > Hi Buland, > > Firstly, thanks for your comments! > > Executing the following commands: > > [root@localhost ktap]# uname -r > 3.10.0-123.el7.x86_64.debug > > [root@localhost ktap]# rpm -q kernel-debuginfo > kernel-debuginfo-3.10.0-123.el7.x86_64 > > [root@localhost ktap]# rpm -q kernel > kernel-3.10.0-123.el7.x86_64 > > It seems all the versions are match. So I think it is not this issue, > thanks! > Best Regards > Nan Xiao > > Nan, The kernel running on your system is kernel-debug-3.10.0-123.el7.x86_64 [root@localhost ktap]# uname -r 3.10.0-123.el7.x86_64.debug ^ '.... It is provided by kernel-debug-3.10.0-123.el7.x86_64.rpm The kernel-debuginfo package installed on your system is for normal kernel. [root@localhost ktap]# rpm -q kernel-debuginfo kernel-debuginfo-3.10.0-123.el7.x86_64 To fix it, you need to install kernel-debug-debuginfo-3.10.0-123.el7.x86_64.rpm -- BKS -- Crash-utility mailing list Crash-utility(a)redhat.com https://www.redhat.com/mailman/listinfo/crash-utility

----- Original Message ----- > Hi Buland, > > Thanks very much for your answer! After installing the right debuginfo package, > now crash works! > > BTW, if possible, could you spare a little time to explain other confusion: it seems > that I don't select whether "debug" version or not during install RHEL 7, why does it > install the "debug" version for me? Thanks! > Best Regards > Nan Xiao I haven't done a RHEL7 installation from scratch in quite some time, but with respect to the software selection stage, it gives you a handful of possibilities (Minimal Install, Basic Web Server, Virtualization Host, etc.), and with any of those selections you would get the standard kernel-<version> package. I don't even think it's possible to get the kernel-debug-<version> package unless you did some kind of custom installation, or if it was installed after-the-fact. Your system should have log files in /root that show what packages were originally installed on the system. Check them for evidence of which kernel was installed. Dave > > > On Mon, Nov 2, 2015 at 4:09 PM, Buland Kumar Singh > <6b65726e656c(a)gmail.com&gt; wrote: > > On 2 November 2015 at 12:56, Nan Xiao <xiaonan830818(a)gmail.com&gt; wrote: > >> > >> Hi Buland, > >> > >> Firstly, thanks for your comments! > >> > >> Executing the following commands: > >> > >> [root@localhost ktap]# uname -r > >> 3.10.0-123.el7.x86_64.debug > >> > >> [root@localhost ktap]# rpm -q kernel-debuginfo > >> kernel-debuginfo-3.10.0-123.el7.x86_64 > >> > >> [root@localhost ktap]# rpm -q kernel > >> kernel-3.10.0-123.el7.x86_64 > >> > >> It seems all the versions are match. So I think it is not this issue, > >> thanks! > >> Best Regards > >> Nan Xiao > >> > >> > > > > Nan, > > > > The kernel running on your system is kernel-debug-3.10.0-123.el7.x86_64 > > > > [root@localhost ktap]# uname -r > > 3.10.0-123.el7.x86_64.debug > > ^ > > '.... > > > > It is provided by kernel-debug-3.10.0-123.el7.x86_64.rpm > > > > The kernel-debuginfo package installed on your system is for normal kernel. > > > > [root@localhost ktap]# rpm -q kernel-debuginfo > > kernel-debuginfo-3.10.0-123.el7.x86_64 > > > > To fix it, you need to install > > kernel-debug-debuginfo-3.10.0-123.el7.x86_64.rpm > > > > -- > > BKS > > > > -- > > Crash-utility mailing list > > Crash-utility(a)redhat.com > > https://www.redhat.com/mailman/listinfo/crash-utility > > -- > Crash-utility mailing list > Crash-utility(a)redhat.com > https://www.redhat.com/mailman/listinfo/crash-utility > -- Crash-utility mailing list Crash-utility(a)redhat.com https://www.redhat.com/mailman/listinfo/crash-utility