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[Bug runtime/17362] New: no script-level local variables available in F20's kernel.function("do_execve")
- From: "mcermak at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: systemtap at sourceware dot org
- Date: Mon, 08 Sep 2014 15:15:40 +0000
- Subject: [Bug runtime/17362] New: no script-level local variables available in F20's kernel.function("do_execve")
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=17362
Bug ID: 17362
Summary: no script-level local variables available in F20's
kernel.function("do_execve")
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: runtime
Assignee: systemtap at sourceware dot org
Reporter: mcermak at redhat dot com
No script-level local variables available in F20's
kernel.function("do_execve"). This changed between 3.13.9-200.fc20 and
3.15.10-201.fc20:
# uname -r; rpm -q systemtap
3.13.9-200.fc20.x86_64
systemtap-2.7-1.mcermak.e454243.fc20.x86_64
# stap -L 'kernel.function("do_execve")'
kernel.function("do_execve@fs/exec.c:1575") $filename:char const* $__argv:char
const* const* $__envp:char const* const*
#
# stap -e 'probe kernel.function("do_execve"){log(user_string($__argv[0]))}' -c
/bin/true
/bin/true
#
# uname -r; rpm -q systemtap
3.15.10-201.fc20.x86_64
systemtap-2.7-1.mcermak.e454243.fc20.x86_64
# stap -L 'kernel.function("do_execve")'
kernel.function("do_execve@fs/exec.c:1547")
#
# stap -e 'probe kernel.function("do_execve"){log(user_string($__argv[0]))}' -c
/bin/true
semantic error: failed to retrieve location attribute for '__argv' [man
error::dwarf]: identifier '$__argv' at <input>:1:52
dieoffset: 0x186983f from unknown debug file for kernel
function: do_execve at fs/exec.c:1553 inlined by SYSC_execve at
fs/exec.c:1607 inlined by SyS_execve at fs/exec.c:1602
source: probe
kernel.function("do_execve"){log(user_string($__argv[0]))}
^
Pass 2: analysis failed. [man error::pass2]
#
The function declaration didn't change significantly:
=====
# grep -A 8 '^int do_execve'
/usr/src/debug/kernel-3.13.fc20/linux-3.13.9-200.fc20.x86_64/fs/exec.c
int do_execve(const char *filename,
const char __user *const __user *__argv,
const char __user *const __user *__envp)
{
struct user_arg_ptr argv = { .ptr.native = __argv };
struct user_arg_ptr envp = { .ptr.native = __envp };
return do_execve_common(filename, argv, envp);
}
# grep -A 8 '^int do_execve'
/usr/src/debug/kernel-3.15.fc20/linux-3.15.10-201.fc20.x86_64/fs/exec.c
int do_execve(struct filename *filename,
const char __user *const __user *__argv,
const char __user *const __user *__envp)
{
struct user_arg_ptr argv = { .ptr.native = __argv };
struct user_arg_ptr envp = { .ptr.native = __envp };
return do_execve_common(filename, argv, envp);
}
#
=====
This breaks systemtap.base/pointer_array.exp testcase on newer f20 kernels.
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