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[Bug kprobes/4531] systemtap tests fail produce kernel oops on some configs of 2.6.22-rc2 kernel
- From: "wcohen at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sources dot redhat dot com
- Date: 22 May 2007 22:10:12 -0000
- Subject: [Bug kprobes/4531] systemtap tests fail produce kernel oops on some configs of 2.6.22-rc2 kernel
- References: <20070522162140.4531.wcohen@redhat.com>
- Reply-to: sourceware-bugzilla at sourceware dot org
------- Additional Comments From wcohen at redhat dot com 2007-05-22 23:10 -------
Put im some diagnostic printk in mark_rodata_ro() for the 2.6.22-rc2. Below is
the output:
May 22 17:31:36 dhcp231-176 kernel: num_possible_cpus()= 1
May 22 17:31:36 dhcp231-176 kernel: start= ffffffff80207000 end= ffffffff80556000
May 22 17:31:36 dhcp231-176 kernel: Write protecting the kernel read-only data:
3388k
Looking up the address from the nm:
ffffffff80207000 T _stext
ffffffff80556090 R __end_rodata
Looks like all the kprobe address falls between those two.
ffffffff8043cd00 T schedule
This is uniprocessor machine so the process is marking the text as read only
too. Thus, the following start point is not used:
ffffffff804449a8 A _etext
--
http://sourceware.org/bugzilla/show_bug.cgi?id=4531
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