From: "wcohen at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: systemtap@sourceware.org
Subject: [Bug translator/24224] tapsets.cxx Assert kernel relocation invariants fails for some kernel.function("*@*.c:*") probes
Date: Tue, 26 Feb 2019 18:44:00 -0000 [thread overview]
Message-ID: <bug-24224-6586-1pXwCGeI0A@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-24224-6586@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=24224
--- Comment #4 from William Cohen <wcohen at redhat dot com> ---
The problem is tied to accessing target variables. According to the linux
source code in net/core/dev.c there are 2 target variables:
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
{
...
stap listing lists the two of them:
$ stap -L 'kernel.function("dev_set_mac_address")'
kernel.function("dev_set_mac_address@net/core/dev.c:7715") $dev:struct
net_device* $sa:struct sockaddr*
When going through the $dev and $sa from the source code $dev okay, but $sa has
a problem:
[wcohen@cervelo pr24224]$ ../install/bin/stap -p4 -e 'probe
kernel.function("dev_set_mac_address") { printf("%x\n", $dev); exit() }'
/home/wcohen/.systemtap/cache/cd/stap_cdef9e8a2d4b9d5a0e4252d87f28b7c2_1881.ko
[wcohen@cervelo pr24224]$ ../install/bin/stap -p4 -e 'probe
kernel.function("dev_set_mac_address") { printf("%x\n", $sa); exit() }'
semantic error: inconsistent relocation address: keyword at <input>:1:1
source: probe kernel.function("dev_set_mac_address") { printf("%x\n",
$sa); exit() }
^
Pass 2: analysis failed. [man error::pass2]
--
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next prev parent reply other threads:[~2019-02-26 18:44 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-15 21:06 [Bug translator/24224] New: " wcohen at redhat dot com
2019-02-15 21:33 ` [Bug translator/24224] " wcohen at redhat dot com
2019-02-22 21:58 ` wcohen at redhat dot com
2019-02-26 15:49 ` wcohen at redhat dot com
2019-02-26 18:44 ` wcohen at redhat dot com [this message]
2019-02-26 19:18 ` wcohen at redhat dot com
2019-02-26 19:23 ` [Bug translator/24224] tapsets.cxx kernel relocation assert fails when attempting to access some function parameters wcohen at redhat dot com
2019-03-08 16:33 ` wcohen at redhat dot com
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