Re: Re: Re: Re: crash and sles 9 dumps (Dave Anderson)

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Dave Anderson wrote:
Daniel Li wrote:
It seems the problem is not one with guest dump, but the version of SLES.

After upgrading my NATIVE SLES 9 system to SP 3, exactly the same problem happened while trying to use 'crash' on the live system, with a debug linux kernel ('vmlinux.dbg' below) built on the same system from matching 'kernel-source' package. (During this upgrade, the linux kernel changed from 2.6.5-7.97-smp to 2.6.5-7.244-smp, the same as that on the guest.)

Has anyone else seen this?

Did anything change in the task_struct between 2.6.5-7.97-smp and
2.6.5-7.244-smp?

Or, more likely, anything associated with the pidhash/pid_hash-related
code in the kernel?

Is the output of the crash command "help -t | grep refresh_task_table"
different when running against 2.6.5-7.97-smp vs. 2.6.5-7.244-smp?

Dave

The definition of task_struct between 2.6.5-7.97-smp and 2.6.5-7.244-smp did change. There is one new 8-bytes field called 'last_ran' before the list_head for tasks. This is what I don't get: why should it matter as long as the dump and debug kernel are using the same definition?

The output of "help -t | grep refresh_task_table" didn't change.

Later,
Daniel

struct task_struct {
       volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
       struct thread_info *thread_info;
       atomic_t usage;
       unsigned long flags;    /* per process flags, defined below */
       unsigned long ptrace;

       int lock_depth;         /* Lock depth */

       int prio, static_prio;
       struct list_head run_list;
       prio_array_t *array;

       unsigned long sleep_avg;
       long interactive_credit;
       unsigned long long timestamp, last_ran;
       int activated;

       unsigned long policy;
       cpumask_t cpus_allowed;
       unsigned int time_slice, first_time_slice;

       struct list_head tasks;
       struct list_head ptrace_children;
       struct list_head ptrace_list;
...



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