[ltt-dev] Problems with LTT Probe Install (Kernel Panic)
Thomas Besemer
tbesemer at thomas-iv.com
Wed Jun 4 12:59:05 EDT 2008
Hi Mathieu -
Thanks for your fast response!
I pulled 2.6.25.4 from kernel.org, and tried both
of these patches on it:
patch-2.6.25.4-lttng-0.10-pre55.tar.bz2
patch-2.6.25-rc9-git1-lttng-0.10-pre52.tar.bz2
Both patches had quite a few failed areas, so I
am wondering if I have the wrong Kernel???
Attached is the output from pre52 onto 2.6.25.4
tree, if it helps. Also, this will not compile,
fails in:
make[1]: *** [arch/x86/kernel/alternative.o] Error 1
make: *** [arch/x86/kernel] Error 2
I'm happy to try anything you suggest; I just
didn't want to start fixing code problems until
I was sure I was using the right Kernel.
Thanks for your help.
tom
------- Original Message -------
On 6/3/2008 12:38 PM Mathieu Desnoyers wrote:
Hi Thomas,
I just re-installed a new ML server, sorry for the delay.
2.6.22-rc4-mm2 is a rather "test-only" release.
Can you try with the latest versions ? 2.6.25.4 and follow the
compatibility list on ltt.polymtl.ca
Thanks,
Mathieu
>
> Hi -
>
>
>
> I am currently in the process of trying to get the
>
> LTTng going, but am having some trouble with Probe
>
> installs that seems rather basic/fundamental to
>
> the operation. My versions of everything are:
>
>
>
> Linux 2.6.22.23 SMP x86_64
>
>
>
> patch-2.6.22-rc4-mm2-lttng-0.9.10
>
>
>
> ltt-control-0.42-16072007
>
>
>
> LinuxTraceToolkitViewer-0.8.84-12082007
>
>
>
> My Kernel configuration is:
>
>
>
> #
>
> # Instrumentation Support
>
> #
>
> # CONFIG_PROFILING is not set
>
> CONFIG_KPROBES=y
>
> # CONFIG_IMMEDIATE is not set
>
> CONFIG_MARKERS=y
>
> CONFIG_LTT=y
>
> CONFIG_LTT_TRACER=y
>
> CONFIG_LTT_RELAY=y
>
> CONFIG_LTT_SERIALIZE=y
>
> # CONFIG_LTT_ALIGNMENT is not set
>
> # CONFIG_LTT_HEARTBEAT is not set
>
> # CONFIG_LTT_TEST_TSC is not set
>
> # CONFIG_LTT_USERSPACE_GENERIC is not set
>
> CONFIG_LTT_NETLINK_CONTROL=y
>
> CONFIG_LTT_STATEDUMP=y
>
>
>
> #
>
> # Probes
>
> #
>
> CONFIG_LTT_PROBE_CORE=m
>
> CONFIG_LTT_PROBE_FS=m
>
> CONFIG_LTT_PROBE_KERNEL=m
>
> CONFIG_LTT_PROBE_ARCH=m
>
> CONFIG_LTT_PROBE_MM=m
>
> CONFIG_LTT_PROBE_NET=m
>
> CONFIG_LTT_PROBE_LIST=m
>
> CONFIG_LTT_PROBE_LOCKING=m
>
> # CONFIG_LTT_PROBE_STACK is not set
>
>
>
> During boot, I see the following messages:
>
>
>
> LTT : ltt-facilities init
>
> LTT : ltt-relay init
>
> ltt-control init
>
> LTT : ltt-facility-statedump init
>
>
>
> Then, I tried to install <ltt-probe-core.ko>;
>
> this gave me a Kernel Panic. I did some looking around,
>
> commented out some areas of the code so that I learn a
>
> few things, and found the following:
>
>
>
> In <marker.c>, this is where the fault is occuring:
>
>
>
> static struct marker_entry *_get_marker(const char *name)
>
> {
>
> struct hlist_node *node;
>
> struct marker_entry *e;
>
>
>
> hlist_for_each_entry(e, node, &marker_list, hlist)
>
> printk( "_get_marker(): name %x, e-name %s\n",
>
> name, e->name);
>
>
>
> /* if (!strcmp(name, e->name))
>
> return e;
>
> tbesemer
>
> */
>
>
>
> return NULL;
>
> }
>
>
>
> Through the printk() I put in, instead of the strcmp(), I found
>
> that "name" is passed in as NULL. More so, if you look at the
>
> following dump from dmesg for <ltt-probe-kernel.ko>, you can
>
> see not only is "name" NULL at times, but it looks like the same
>
> stuff keeps getting operated on:
>
>
>
> _get_marker(): name 8058a9c0, e-name kernel_process_signal
>
> _get_marker(): name 8058a9c0, e-name kernel_process_wait
>
> _get_marker(): name 8058a9c0, e-name kernel_process_free
>
> _get_marker(): name 8058a9c0, e-name kernel_process_exit
>
> _get_marker(): name 8058a9c0, e-name kernel_process_fork
>
> _get_marker(): name 0, e-name kernel_irq_exit
>
> _get_marker(): name 0, e-name kernel_irq_entry
>
> _get_marker(): name 0, e-name kernel_module_free
>
> _get_marker(): name 0, e-name kernel_module_load
>
> _get_marker(): name 0, e-name kernel_kthread_stop_ret
>
> _get_marker(): name 0, e-name kernel_kthread_stop
>
> _get_marker(): name 0, e-name kernel_tasklet_high_exit
>
> _get_marker(): name 0, e-name kernel_tasklet_high_entry
>
> _get_marker(): name 0, e-name kernel_tasklet_low_exit
>
> _get_marker(): name 0, e-name kernel_tasklet_low_entry
>
> _get_marker(): name 0, e-name kernel_softirq_exit
>
> _get_marker(): name 0, e-name kernel_softirq_entry
>
> _get_marker(): name 0, e-name kernel_timer_timeout
>
> _get_marker(): name 0, e-name kernel_timer_update_time
>
> _get_marker(): name 0, e-name kernel_timer_set
>
> _get_marker(): name 0, e-name kernel_timer_itimer_set
>
> _get_marker(): name 0, e-name kernel_timer_itimer_expired
>
> _get_marker(): name 0, e-name kernel_vprintk
>
> _get_marker(): name 0, e-name kernel_printk
>
> _get_marker(): name 0, e-name kernel_sched_schedule
>
> _get_marker(): name 0, e-name kernel_sched_migrate_task
>
> _get_marker(): name 0, e-name kernel_sched_wakeup_new_task
>
> _get_marker(): name 0, e-name kernel_sched_try_wakeup
>
> _get_marker(): name 0, e-name kernel_sched_wait_task
>
> _get_marker(): name 0, e-name kernel_process_signal
>
> _get_marker(): name 0, e-name kernel_process_wait
>
> _get_marker(): name 0, e-name kernel_process_free
>
> _get_marker(): name 0, e-name kernel_process_exit
>
> _get_marker(): name 0, e-name kernel_process_fork
>
> _get_marker(): name 802510f8, e-name kernel_irq_exit
>
> _get_marker(): name 802510f8, e-name kernel_irq_entry
>
> _get_marker(): name 802510f8, e-name kernel_module_free
>
> _get_marker(): name 802510f8, e-name kernel_module_load
>
> _get_marker(): name 802510f8, e-name kernel_kthread_stop_ret
>
>
>
> [snip lot's of output until the end]
>
>
>
> _get_marker(): name 0, e-name kernel_process_signal
>
> _get_marker(): name 0, e-name kernel_process_wait
>
> _get_marker(): name 0, e-name kernel_process_free
>
> _get_marker(): name 0, e-name kernel_process_exit
>
> _get_marker(): name 0, e-name kernel_process_fork
>
> _get_marker(): name 802510f8, e-name kernel_irq_exit
>
> _get_marker(): name 802510f8, e-name kernel_irq_entry
>
> _get_marker(): name 802510f8, e-name kernel_module_free
>
> _get_marker(): name 802510f8, e-name kernel_module_load
>
> _get_marker(): name 802510f8, e-name kernel_kthread_stop_ret
>
> _get_marker(): name 802510f8, e-name kernel_kthread_stop
>
> _get_marker(): name 802510f8, e-name kernel_tasklet_high_exit
>
> _get_marker(): name 802510f8, e-name kernel_tasklet_high_entry
>
> _get_marker(): name 802510f8, e-name kernel_tasklet_low_exit
>
> _get_marker(): name 802510f8, e-name kernel_tasklet_low_entry
>
> _get_marker(): name 802510f8, e-name kernel_softirq_exit
>
> _get_marker(): name 802510f8, e-name kernel_softirq_entry
>
> _get_marker(): name 802510f8, e-name kernel_timer_timeout
>
> _get_marker(): name 802510f8, e-name kernel_timer_update_time
>
> _get_marker(): name 802510f8, e-name kernel_timer_set
>
> _get_marker(): name 802510f8, e-name kernel_timer_itimer_set
>
> _get_marker(): name 802510f8, e-name kernel_timer_itimer_expired
>
> _get_marker(): name 802510f8, e-name kernel_vprintk
>
> _get_marker(): name 802510f8, e-name kernel_printk
>
> _get_marker(): name 802510f8, e-name kernel_sched_schedule
>
> _get_marker(): name 802510f8, e-name kernel_sched_migrate_task
>
> _get_marker(): name 802510f8, e-name kernel_sched_wakeup_new_task
>
> _get_marker(): name 802510f8, e-name kernel_sched_try_wakeup
>
> _get_marker(): name 802510f8, e-name kernel_sched_wait_task
>
> _get_marker(): name 802510f8, e-name kernel_process_signal
>
> _get_marker(): name 802510f8, e-name kernel_process_wait
>
> _get_marker(): name 802510f8, e-name kernel_process_free
>
> _get_marker(): name 802510f8, e-name kernel_process_exit
>
> _get_marker(): name 802510f8, e-name kernel_process_fork
>
> (END)
>
>
>
> --
>
> So, the summary is:
>
>
>
> 1. I have applied the patch set. Some areas were fuzzy
>
> patches, I have not looked at all those.
>
> 2. Where the patch set FAILED, I resovled by hand.
>
> 3. I configured/built Kernel, looks like LTT at Kernel
>
> level is somewhat okay - does not crash Kernel.
>
> 4. I start to add probes, and I get Kernel Panics because
>
> of "name" being passed to _get_marker(const char *name)
>
> is NULL.
>
>
>
> All help appreciated - always willing to give back any changes I
>
> come up with, and keep you in the loop of how it is working for
>
> me.
>
>
>
> Many thanks,
>
>
>
> Tom
>
--
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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