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Message-ID: <20100722072044.GD27177@redhat.com>
Date: Thu, 22 Jul 2010 10:20:44 +0300
From: Gleb Natapov <gleb@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: mingo@...e.hu, peterz@...radead.org, paulus@...ba.org
Subject: perf annotate segfaults when source code has goto label that looks
like hex number
The script below demonstrate this. The problem is in
hist_entry__parse_objdump_line():
if (*tmp) {
/*
* Parse hexa addresses followed by ':'
*/
line_ip = strtoull(tmp, &tmp2, 16);
if (*tmp2 != ':' || tmp == tmp2)
line_ip = -1;
}
strtoull() returns valid number when it gets line with label and following
test passes too. I can't think of a way to unambiguously distinguish between
label and valid rip. May be running objdump with --prefix-addresses will
help, but it may make other thing unambiguous.
=== script ===
cat > test.c << EOF
int main(int argc, char **argv)
{
int i;
while(1) {
i++;
if (i == 10000000)
goto add;
}
add:
return 0;
}
EOF
gcc -g test.c
perf record ./a.out
perf annotate
--
Gleb.
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