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2015-12-10 23:38 GMT+01:00 <sv...@va...>:
> Author: philippe
> Date: Thu Dec 10 22:37:59 2015
> New Revision: 15745
>
> ...
>
> Added: trunk/massif/tests/mmapunmap.post.exp
>
> ==============================================================================
> --- trunk/massif/tests/mmapunmap.post.exp (added)
> +++ trunk/massif/tests/mmapunmap.post.exp Thu Dec 10 22:37:59 2015
> @@ -0,0 +1 @@
> + n0: 81920000 0x........: main (mmapunmap.c:11)
>
Hello Philippe,
Thank you for a new massif test case!
When porting this test case to Solaris, I noticed that stack trace differs
from Linux.
Linux gives (with --show-below-main=yes):
n2: 88260608 (page allocation syscalls) mmap/mremap/brk, --alloc-fns, etc.
n1: 81920000 0x4D29729: mmap (syscall-template.S:81)
n1: 81920000 0x400714: main (mmapunmap.c:11)
n1: 81920000 0x4C48A3E: __libc_start_main (libc-start.c:289)
n1: 81920000 0x400547: _start (in
/var/tmp/valgrind/massif/tests/mmapunmap)
while Solaris gives:
n2: 93609984 (page allocation syscalls) mmap/mremap/brk, --alloc-fns, etc.
n1: 81920000 0x7FFB4ACD9: mmap (in /lib/amd64/libc.so.1)
n0: 81920000 0x400E61: _start (in
/export/home/tester1/valgrind/massif/tests/mmapunmap)
Function mmap() does not contain proper function prologue (push %rbp; mov
%rsp, %rbp is missing)
on both Solaris and Linux.
I think the difference stems from the fact that Solaris libc currently
contains
no DWARF CFI. So that the unwinder which takes a stack trace gets just %rip
for mmap()
and by following the %rbp chain it gets also a return address from %rbp+8
(which points at _start() where it calls main()).
I wonder if I can adjust the test case by introducing an intermediate
function
so that the stack trace will look like (--show-below-main=no):
n2: (page allocation syscalls) mmap/mremap/brk, --alloc-fns, etc.
n1: mmap (syscall-template.S:81)
n1: f (mmapunmap.c:11)
n1: main (mmapunmap.c:20)
or
n2: (page allocation syscalls) mmap/mremap/brk, --alloc-fns, etc.
n1: mmap (in /lib/amd64/libc.so.1)
n1: main (mmapunmap.c:20)
and grep in mmapunmap.vgtest just for "mmapunmap.c". Would such test still
cover
the bug you fixed?
===================
...
int f(void)
{
void *m;
m = mmap(NULL, 80 * 1000 * 1024,
PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
-1, 0);
munmap(m, 80 * 1000 * 1024);
return 0;
}
int main()
{
return f();
}
===================
I tried to get stack traces also with gdb. It gives "correct" stack traces
on
Solaris with original sources, such as:
mmap (in /lib/amd64/libc.so.1)
main (mmapunmap.c:11)
It cannot use DWARF CFI for libc as there is none. And following %rbp chain
just gives
mmap() and _start(), but not main(). Do you have any idea what gdb does
behind the scenes?
Kind regards,
I.
|
|
From: <sv...@va...> - 2015-12-12 19:58:48
|
Author: iraisr
Date: Sat Dec 12 19:58:40 2015
New Revision: 15746
Log:
Remove a temporary file after massif/tests/mmapunmap test run.
n-i-bz
Modified:
trunk/massif/tests/ (props changed)
trunk/massif/tests/mmapunmap.vgtest
Modified: trunk/massif/tests/mmapunmap.vgtest
==============================================================================
--- trunk/massif/tests/mmapunmap.vgtest (original)
+++ trunk/massif/tests/mmapunmap.vgtest Sat Dec 12 19:58:40 2015
@@ -3,4 +3,4 @@
vgopts: --stacks=no --time-unit=B --depth=8 --massif-out-file=massif.out
vgopts: --ignore-fn=__part_load_locale --ignore-fn=__time_load_locale --ignore-fn=dwarf2_unwind_dyld_add_image_hook --ignore-fn=get_or_create_key_element
post: grep -A3 -e =peak massif.out | grep -e 'main (mmapunmap.c:11)' | ../../tests/filter_addresses
-# cleanup: rm massif.out
+cleanup: rm massif.out
|