[Bug symtab/27999] New: <error reading variable: dwarf2_find_location_expression: Corrupted DWARF expression.>

[Bug symtab/27999] New: <error reading variable: dwarf2_find_location_expression: Corrupted DWARF expression.>

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27999

            Bug ID: 27999
           Summary: <error reading variable:
                    dwarf2_find_location_expression: Corrupted DWARF
                    expression.>
           Product: gdb
           Version: 10.1
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: schwab@linux-m68k.org
  Target Milestone: ---
            Target: riscv64-*-*

This makes debugging impossible on riscv64.

$ ./gdb gdb
GNU gdb (GDB) 11.0.50.20210620-git
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "riscv64-linux".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from gdb...
Setting up the environment for debugging gdb.
During symbol reading: unsupported tag: 'DW_TAG_unspecified_type'
Breakpoint 1 at 0x36a594: file ../../gdb/gdbsupport/errors.cc, line 54.
During symbol reading: .debug_line address at offset 0x11db3d is 0 [in module
/daten/src/gdb/n-riscv64/gdb/gdb]
During symbol reading: Member function "~_Sp_counted_base" (offset 0x890d98) is
virtual but the vtable offset is not specified
During symbol reading: cannot get low and high bounds for subprogram DIE at
0x8a3586
During symbol reading: DW_AT_call_target target DIE has invalid low pc, for
referencing DIE 0x8bd872 [in module /daten/src/gdb/n-riscv64/gdb/gdb]
During symbol reading: Child DIE 0x8bd843 and its abstract origin 0x8c306c have
different parents
During symbol reading: No DW_FORM_block* DW_AT_call_value for DW_TAG_call_site
child DIE 0x8c2170 [in module /daten/src/gdb/n-riscv64/gdb/gdb]
During symbol reading: Duplicate PC 0x9ba74 for DW_TAG_call_site DIE 0x8cc021
[in module /daten/src/gdb/n-riscv64/gdb/gdb]
Breakpoint 2 at 0x9b968: file ../../gdb/gdb/cli/cli-cmds.c, line 208.
(top-gdb) b decode_debug_loclists_addresses
During symbol reading: Multiple children of DIE 0x1363926 refer to DIE
0x1361e63 as their abstract origin
Breakpoint 3 at 0xfafa6: file ../../gdb/gdb/dwarf2/loc.c, line 165.
(top-gdb) cd ~/src/test
Working directory /home/andreas/src/test
 (canonically /daten/src/test).
(top-gdb) r hello
Starting program: /daten/src/gdb/n-riscv64/gdb/gdb hello
During symbol reading: cannot get low and high bounds for subprogram DIE at
0x7ded
During symbol reading: Child DIE 0x84f3 and its abstract origin 0xbd97 have
different parents
During symbol reading: DW_AT_call_target target DIE has invalid low pc, for
referencing DIE 0x8c9a [in module
/usr/lib/debug/usr/lib64/ld-2.33.so-2.33-8.1.riscv64.debug]
During symbol reading: file index out of range
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/lp64d/libthread_db.so.1".
[Detaching after vfork from child process 4730]
[New Thread 0x3ff783a960 (LWP 4731)]
[New Thread 0x3ff7039960 (LWP 4732)]
[New Thread 0x3ff6838960 (LWP 4733)]
[New Thread 0x3ff6037960 (LWP 4734)]
GNU gdb (GDB) 11.0.50.20210620-git
Copyright (C) 2021 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "riscv64-linux".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from hello...
(gdb) start
Temporary breakpoint 1 at 0x105c4: file hello.c, line 6.
Starting program: /daten/src/test/hello 
[Detaching after vfork from child process 4735]
[Detaching after fork from child process 4736]
During symbol reading: Child DIE 0xd4aa and its abstract origin 0xf8f3 have
different parents
During symbol reading: cannot get low and high bounds for subprogram DIE at
0xd6c8
During symbol reading: No DW_FORM_block* DW_AT_call_value for DW_TAG_call_site
child DIE 0xf193 [in module
/usr/lib/debug/usr/lib64/ld-2.33.so-2.33-8.1.riscv64.debug]
During symbol reading: Multiple children of DIE 0x10422 refer to DIE 0xd6da as
their abstract origin
During symbol reading: No DW_FORM_block* DW_AT_call_value for DW_TAG_call_site
child DIE 0x193ba [in module
/usr/lib/debug/usr/lib64/ld-2.33.so-2.33-8.1.riscv64.debug]
During symbol reading: Multiple children of DIE 0x19904 refer to DIE 0x19ee9 as
their abstract origin
During symbol reading: Child DIE 0x19995 and its abstract origin 0x1a0a5 have
different parents
During symbol reading: cannot get low and high bounds for subprogram DIE at
0x19ee0

Temporary breakpoint 1, main () at hello.c:6
6         printf ("Hello World!\n");
(gdb) s

Thread 1 "gdb" hit Breakpoint 3, decode_debug_loclists_addresses (per_cu=<error
reading variable: dwarf2_find_location_expression: Corrupted DWARF
expression.>, per_objfile=<error reading variable:
dwarf2_find_location_expression: Corrupted DWARF expression.>, loc_ptr=<error
reading variable: dwarf2_find_location_expression: Corrupted DWARF
expression.>, buf_end=<error reading variable: dwarf2_find_location_expression:
Corrupted DWARF expression.>, new_ptr=<error reading variable:
dwarf2_find_location_expression: Corrupted DWARF expression.>, low=<error
reading variable: dwarf2_find_location_expression: Corrupted DWARF
expression.>, high=<error reading variable: dwarf2_find_location_expression:
Corrupted DWARF expression.>, byte_order=<error reading variable:
dwarf2_find_location_expression: Corrupted DWARF expression.>, addr_size=<error
reading variable: dwarf2_find_location_expression: Corrupted DWARF
expression.>, signed_addr_p=<error reading variable:
dwarf2_find_location_expression: Corrupted DWARF expression.>) at
../../gdb/gdb/dwarf2/loc.c:165
165     decode_debug_loclists_addresses (dwarf2_per_cu_data *per_cu,
(top-gdb) s
During symbol reading: incomplete CFI data; unspecified registers (e.g., zero)
at 0xfafea
177       if (loc_ptr == buf_end)
(top-gdb) 
180       switch (*loc_ptr++)
(top-gdb) disp/i $pc
1: x/i $pc
=> 0xfafc0 <decode_debug_loclists_addresses(dwarf2_per_cu_data*,
dwarf2_per_objfile*, gdb_byte const*, gdb_byte const*, gdb_byte const**,
CORE_ADDR*, CORE_ADDR*, bfd_endian, unsigned int, int)+26>:   mv      s0,a3
(top-gdb) si
0x00000000000fafc2      180       switch (*loc_ptr++)
1: x/i $pc
=> 0xfafc2 <decode_debug_loclists_addresses(dwarf2_per_cu_data*,
dwarf2_per_objfile*, gdb_byte const*, gdb_byte const*, gdb_byte const**,
CORE_ADDR*, CORE_ADDR*, bfd_endian, unsigned int, int)+28>:   lbu     a3,0(t1)
(top-gdb) 
0x00000000000fafc6      180       switch (*loc_ptr++)
1: x/i $pc
=> 0xfafc6 <decode_debug_loclists_addresses(dwarf2_per_cu_data*,
dwarf2_per_objfile*, gdb_byte const*, gdb_byte const*, gdb_byte const**,
CORE_ADDR*, CORE_ADDR*, bfd_endian, unsigned int, int)+32>:   mv      s4,a5
(top-gdb) i reg a3
a3             0x7      7
(top-gdb) x/8c $t1
0x3ff4f14c6e:   7 '\a'  -16 '\360'      -112 '\220'     5 '\005'        0
'\000'
        0 '\000'        0 '\000'        0 '\000'
(top-gdb) c
Continuing.

Thread 1 "gdb" hit Breakpoint 3, decode_debug_loclists_addresses (per_cu=<error
reading variable: dwarf2_find_location_expression: Corrupted DWARF
expression.>, per_objfile=<error reading variable:
dwarf2_find_location_expression: Corrupted DWARF expression.>, loc_ptr=<error
reading variable: dwarf2_find_location_expression: Corrupted DWARF
expression.>, buf_end=<error reading variable: dwarf2_find_location_expression:
Corrupted DWARF expression.>, new_ptr=<error reading variable:
dwarf2_find_location_expression: Corrupted DWARF expression.>, low=<error
reading variable: dwarf2_find_location_expression: Corrupted DWARF
expression.>, high=<error reading variable: dwarf2_find_location_expression:
Corrupted DWARF expression.>, byte_order=<error reading variable:
dwarf2_find_location_expression: Corrupted DWARF expression.>, addr_size=<error
reading variable: dwarf2_find_location_expression: Corrupted DWARF
expression.>, signed_addr_p=<error reading variable:
dwarf2_find_location_expression: Corrupted DWARF expression.>) at
../../gdb/gdb/dwarf2/loc.c:165
165     decode_debug_loclists_addresses (dwarf2_per_cu_data *per_cu,
1: x/i $pc
=> 0xfafa6 <decode_debug_loclists_addresses(dwarf2_per_cu_data*,
dwarf2_per_objfile*, gdb_byte const*, gdb_byte const*, gdb_byte const**,
CORE_ADDR*, CORE_ADDR*, bfd_endian, unsigned int, int)>:      addi    sp,sp,-64
(top-gdb)

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[Bug symtab/27999] <error reading variable: dwarf2_find_location_expression: Corrupted DWARF expression.>

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27999

--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Andreas Schwab <schwab@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=80d1206d7fea6eb756183e2825abdfd0f00cd976

commit 80d1206d7fea6eb756183e2825abdfd0f00cd976
Author: Andreas Schwab <schwab@suse.de>
Date:   Mon Jun 21 11:38:23 2021 +0200

    gdb: Support DW_LLE_start_end

    Without that it is impossible to debug on riscv64.

    gdb/
            PR symtab/27999
            * dwarf2/loc.c (decode_debug_loclists_addresses): Support
            DW_LLE_start_end.

    gdb/testsuite/
            PR symtab/27999
            * lib/dwarf.exp (start_end): New proc inside loclists.
            * gdb.dwarf2/loclists-start-end.exp: New file.
            * gdb.dwarf2/loclists-start-end.c: New file.

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[Bug symtab/27999] <error reading variable: dwarf2_find_location_expression: Corrupted DWARF expression.>

[schwab@linux-m68k.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=27999

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
   Target Milestone|---                         |11.1
             Status|NEW                         |RESOLVED

--- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> ---
Fixed in gdb-11.

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