Unknown symbol error using stap in 2.6.31 on ARM

[Alexander Lochmann]

Hi,

try to run stap with "--compatible=1.8".
Stap needs uprobe support for some builtin functions as weel. Using this 
option it will use old fashion builtin function.

Greetings
Alex

On 12/30/2012 02:55 AM, Cipher Chen wrote:
> Hi,
>     I met the same problem descripted here:
>      http://sourceware-org.1504.n7.nabble.com/Unknown-symbol-error-using-stap-in-RHEL-5-4-td176251.html
>
>     What's different is that it's an ARM target. After i got
> ntfs_watching.ko, "staprun ntfs_watching.ko" on that, it told me:
> dmesg here:
> ntfs_watching: Unknown symbol utrace_control
> ntfs_watching: Unknown symbol utrace_barrier
> ntfs_watching: Unknown symbol __utrace_engine_release
> ntfs_watching: Unknown symbol unregister_uretprobe
> ntfs_watching: Unknown symbol register_uprobe
> ntfs_watching: Unknown symbol unmap_uretprobe
> ntfs_watching: Unknown symbol utrace_attach_task
> ntfs_watching: Unknown symbol register_uretprobe
> ntfs_watching: Unknown symbol unmap_uprobe
> ntfs_watching: Unknown symbol utrace_set_events
> ntfs_watching: Unknown symbol unregister_uprobe
>
>   So i tried something mentioned in that thread, it didnt work since
> it's linux-2.6.31.5 without CONFIG_UPROBES.
>   It doesnt have any modules running.
>   Can we say that staprun ran with its own uprobes.ko?
>
>   Then I also copied the uprobes.ko in /tmp/stap**** generated on host
> to the ARM target, and "insmod uprobes.ko"
> dmesg here:
> uprobes: Unknown symbol utrace_control
> uprobes: Unknown symbol utrace_attach_pid
> uprobes: Unknown symbol utrace_set_events
> ("staprun ntfs_watching -u" told me these too)
>
> Any thoughts on what might be causing this problem?
>
>
>
> Thanks!