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[Bug translator/22000] Unable to read $path in chown_common on CentOS 7 due to lack of DW_OP_GNU_parameter_ref support
- From: "zerg2000-sourceware.org at astral dot org.pl" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Fri, 25 Aug 2017 01:50:28 +0000
- Subject: [Bug translator/22000] Unable to read $path in chown_common on CentOS 7 due to lack of DW_OP_GNU_parameter_ref support
- Auto-submitted: auto-generated
- References: <bug-22000-6586@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=22000
--- Comment #1 from Bartosz Kwitniewski <zerg2000-sourceware.org at astral dot org.pl> ---
I have tried to use Jprobes directly for chown_common and I have received
kernel paging fault while accessing path->dentry->d_inode, which is used by
chown_common itself.
Jprobes, just like systemtap works fine with chmod_common. I have noticed this
in /proc/kallsyms:
ffffffff811fc3a0 t chmod_common
ffffffff811fc1f0 t chown_common.isra.15
It seems chown_common is optimized by gcc -fipa-sra flag and it is causing
problems in Jprobes directly, so it might not be related to systemtap itself.
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