https://bugs.kde.org/show_bug.cgi?id=387712
Bug ID: 387712
Summary: s390x cgijnl reports Conditional jump or move depends
on uninitialised value(s)
Product: valgrind
Version: 3.13.0
Platform: Other
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: memcheck
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
I don't have a small example yet.
This happens when running the elfutils testsuite.
==50295== Conditional jump or move depends on uninitialised value(s)
==50295== at 0x407A170: __libdwfl_frame_unwind (frame_unwind.c:711)
==50295== by 0x407A3F1: dwfl_frame_pc (dwfl_frame_pc.c:54)
==50295== by 0x80001F9B: frame_callback (backtrace.c:172)
==50295== by 0x407850B: dwfl_thread_getframes (dwfl_frame.c:450)
==50295== by 0x80001F0B: thread_callback (backtrace.c:201)
==50295== by 0x40782A7: dwfl_getthreads (dwfl_frame.c:294)
==50295== by 0x80001D5D: dump (backtrace.c:223)
==50295== by 0x80002299: exec_dump (backtrace.c:434)
==50295== by 0x80002499: parse_opt (backtrace.c:457)
==50295== by 0x41EB255: argp_parse (in /usr/lib64/libc-2.25.so)
The code looks as follows:
709 /* Check whether this is the initial frame or a signal frame.
710 Then we need to unwind from the original, unadjusted PC. */
711 if (! state->initial_frame && ! state->signal_frame)
712 pc--;
Where the state is defined as:
struct Dwfl_Frame
{
Dwfl_Thread *thread;
/* Previous (outer) frame. */
Dwfl_Frame *unwound;
bool signal_frame : 1;
bool initial_frame : 1;
enum
{
/* This structure is still being initialized or there was an error
initializing it. */
DWFL_FRAME_STATE_ERROR,
/* PC field is valid. */
DWFL_FRAME_STATE_PC_SET,
/* PC field is undefined, this means the next (inner) frame was the
outermost frame. */
DWFL_FRAME_STATE_PC_UNDEFINED
} pc_state;
/* Either initialized from appropriate REGS element or on some archs
initialized separately as the return address has no DWARF register. */
Dwarf_Addr pc;
/* (1 << X) bitmask where 0 <= X < ebl_frame_nregs. */
uint64_t regs_set[3];
/* REGS array size is ebl_frame_nregs.
REGS_SET tells which of the REGS are valid. */
Dwarf_Addr regs[];
};
(gdb) print &state->signal_frame
$3 = (_Bool *) 0x43350f0
(gdb) print &state->initial_frame
$4 = (_Bool *) 0x43350f0
(gdb) print state
$5 = (Dwfl_Frame *) 0x43350e0
(gdb) print *state
$6 = {thread = 0x1ffeffe2c0, unwound = 0x0, signal_frame = false,
initial_frame = false, pc_state = DWFL_FRAME_STATE_PC_SET, pc = 4557114334,
regs_set = {4278255552, 0, 0}, regs = 0x4335118}
(gdb) print sizeof (Dwfl_Frame)
$7 = 56
(gdb) monitor xb 0x43350e0 56
00 00 00 00 00 00 00 00
0x43350E0: 0x00 0x00 0x00 0x1f 0xfe 0xff 0xe2 0xc0
00 00 00 00 00 00 00 00
0x43350E8: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
3f ff ff ff 00 00 00 00
0x43350F0: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x01
00 00 00 00 00 00 00 00
0x43350F8: 0x00 0x00 0x00 0x01 0x0f 0xa0 0x0b 0xde
00 00 00 00 00 00 00 00
0x4335100: 0x00 0x00 0x00 0x00 0xff 0x00 0xff 0xc0
00 00 00 00 00 00 00 00
0x4335108: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
00 00 00 00 00 00 00 00
0x4335110: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
Dump of assembler code for function __libdwfl_frame_unwind:
0x000000000407a130 <+0>: ltg %r1,8(%r2)
0x000000000407a136 <+6>: bner %r14
0x000000000407a138 <+8>: stmg %r6,%r15,48(%r15)
0x000000000407a13e <+14>: lghi %r4,0
0x000000000407a142 <+18>: lay %r15,-192(%r15)
0x000000000407a148 <+24>: lgr %r11,%r2
0x000000000407a14c <+28>: la %r3,176(%r15)
0x000000000407a150 <+32>: brasl %r14,0x407a388 <dwfl_frame_pc>
0x000000000407a156 <+38>: cije %r2,0,0x407a312
<__libdwfl_frame_unwind+482>
0x000000000407a15c <+44>: lg %r1,16(%r11)
0x000000000407a162 <+50>: lg %r3,176(%r15)
0x000000000407a168 <+56>: tmhh %r1,16384
0x000000000407a16c <+60>: jne 0x407a176 <__libdwfl_frame_unwind+70>
=> 0x000000000407a170 <+64>: cgijnl %r1,0,0x407a2c8
<__libdwfl_frame_unwind+408>
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