[Bug server/26247] New: stap crash after Eliding side-effect-free expression

[zhuizhuhaomeng at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=26247

            Bug ID: 26247
           Summary: stap crash after Eliding side-effect-free expression
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: server
          Assignee: systemtap at sourceware dot org
          Reporter: zhuizhuhaomeng at gmail dot com
  Target Milestone: ---

c code compile with cmd:  cc -g -O0 -Wall -std=gnu99 test.c

#cat test.c
typedef struct foo {
    int a;
} foo_t;

foo_t *v[1];

int main(void) {
    return 0;
}


stap code here:
# cat test.stp

function func_test()
{
    (var2_p = @vma(0x601038, "/tmp/a.out"));
}

probe process("/tmp/a.out").statement(0x4004f7) {
    func_test();
}


run with the following cmd
#stap -d ./a.out -c ./a.out test.stp

WARNING: address 0x4004f7 does not match the beginning of a statement (try
0x4004f6)
WARNING: Eliding assignment to 'var2_p': operator '=' at test.stp:3:14
 source:            (var2_p = @vma(0x601038, "/tmp/a.out"));
                            ^
WARNING: Eliding side-effect-free expression : identifier 'func_test' at :7:6
 source:            func_test();
                    ^
run_core.sh: line 2:  8767 Segmentation fault      (core dumped) stap -d
./a.out -c ./a.out test.stp

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