https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99334
AJ D <aatsnps at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
Version|6.2.0 |9.2.0
--- Comment #4 from AJ D <aatsnps at gmail dot com> ---
I can reproduce this issue with gcc 9.2, but this time, on a different routine
(not on the previously reported routine).
GCC Version
============
gcc (GCC) 9.2.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
GCC Configuration
=================
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/depot/qsc/QSCS/GCC/libexec/gcc/x86_64-centos-linux/9.2.0/lto-wrapper
Target: x86_64-centos-linux
Configured with: ../src/gcc-9.2.0/configure --prefix=/depot/gcc-9.2.0
--enable-bootstrap --enable-threads=posix --disable-checking --with-system-zlib
--enable-__cxa_atexit --disable-libunwind-exceptions
--enable-languages=c,c++,fortran --disable-libgcj --with-cpu=generic
--build=x86_64-centos-linux
Thread model: posix
gcc version 9.2.0 (GCC)
Assembly Code
=============
0000000000002c10 <raceGetDistSelectInterval>:
2c10: 4c 8d 54 24 08 lea 0x8(%rsp),%r10
2c15: 48 83 e4 f0 and $0xfffffffffffffff0,%rsp
2c19: 41 ff 72 f8 pushq -0x8(%r10)
2c1d: 55 push %rbp
=> 2c1e: 48 89 e5 mov %rsp,%rbp
2c21: 41 57 push %r15
2c23: 41 56 push %r14
2c25: 41 55 push %r13
2c27: 41 54 push %r12
2c29: 41 52 push %r10
Interrupt happened while on this instruction.
=> 2c1e: 48 89 e5 mov %rsp,%rbp
Here (before executing this instruction), rbp is pointing to parent frame.
So, the following DWARF doesn't look quite right.
000006b0 0000000000000044 000006b4 FDE cie=00000000
pc=0000000000002c10..0000000000003607
DW_CFA_advance_loc: 5 to 0000000000002c15
DW_CFA_def_cfa: r10 (r10) ofs 0
DW_CFA_advance_loc: 9 to 0000000000002c1e
DW_CFA_expression: r6 (rbp) (DW_OP_breg6 (rbp): 0)
DW_CFA_advance_loc: 13 to 0000000000002c2b
DW_CFA_def_cfa_expression (DW_OP_breg6 (rbp): -40; DW_OP_deref)
DW_CFA_expression: r15 (r15) (DW_OP_breg6 (rbp): -8)
DW_CFA_expression: r14 (r14) (DW_OP_breg6 (rbp): -16)
DW_CFA_expression: r13 (r13) (DW_OP_breg6 (rbp): -24)
DW_CFA_expression: r12 (r12) (DW_OP_breg6 (rbp): -32)
>> DW_CFA_advance_loc: 9 to 0000000000002c1e
>> DW_CFA_expression: r6 (rbp) (DW_OP_breg6 (rbp): 0)
Notice at address 0000000000002c1e, we are relying on rbp which is pointing to
the caller procedure's rbp, not the current procedure's rbp.
000006b0 0000000000000044 000006b4 FDE cie=00000000
pc=0000000000002c10..0000000000003607
LOC CFA rbx rbp r12 r13 r14 r15 ra
0000000000002c10 rsp+8 u u u u u u c-8
0000000000002c15 r10+0 u u u u u u c-8
0000000000002c1e r10+0 u exp u u u u c-8
0000000000002c2b exp u exp exp exp exp exp c-8
0000000000002c2c exp exp exp exp exp exp exp c-8
0000000000002e16 r10+0 exp exp exp exp exp exp c-8
0000000000002e23 rsp+8 exp exp exp exp exp exp c-8
0000000000002e24 exp exp exp exp exp exp exp c-8
Actual GDB disassemble at the crash point:
Dump of assembler code for function raceGetDistSelectInterval:
0x00002aaaafd63bd0 <+0>: lea 0x8(%rsp),%r10
0x00002aaaafd63bd5 <+5>: and $0xfffffffffffffff0,%rsp
0x00002aaaafd63bd9 <+9>: pushq -0x8(%r10)
0x00002aaaafd63bdd <+13>: push %rbp
=> 0x00002aaaafd63bde <+14>: mov %rsp,%rbp
0x00002aaaafd63be1 <+17>: push %r15
0x00002aaaafd63be3 <+19>: push %r14
I will add the .i file in few days (have to take care of IP issues as per my
company guidelines).
