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[Bug translator/9773] On x86_64, systemtap sometimes fails to retrieve a local variable
- From: "srikar at linux dot vnet dot ibm dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 22 Jan 2009 11:55:20 -0000
- Subject: [Bug translator/9773] On x86_64, systemtap sometimes fails to retrieve a local variable
- References: <20090121145548.9773.srikar@linux.vnet.ibm.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From srikar at linux dot vnet dot ibm dot com 2009-01-22 11:55 -------
>
> Otherwise, it may just be another instance of the well-known
> gcc debuginfo generation problems.
>
Okay
Similar behaviour on ppc64 too.
I modified the script a bit to
probe kernel.statement("aio_complete@fs/aio.c:1012")
{
printf ("%s \n", $$locals)
exit()
}
Now the output shows
ctx=0xffff8802231d4e00 info=? ring=? event=? flags=0x213 tail=0x6f ret=0x0
mod_name=0x840fa4 descriptor=?
This seems to support what you are suggesting that it could be a optimization issue.
--
http://sourceware.org/bugzilla/show_bug.cgi?id=9773
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