[Bug symtab/26797] New: [readnow] Dwarf error result in no minimal symbols

[Bug symtab/26797] New: [readnow] Dwarf error result in no minimal symbols

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26797

            Bug ID: 26797
           Summary: [readnow] Dwarf error result in no minimal symbols
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

Normally we have:
...
(gdb) file dw2-error^M
Reading symbols from dw2-error...^M
Dwarf Error: wrong version in compilation unit header (is 153, should be 2, 3,
4 or 5) [in module dw2-error]^M
(No debugging symbols found in dw2-error)^M
(gdb) PASS: gdb.dwarf2/dw2-error.exp: file dw2-error
break -q main^M
Breakpoint 1 at 0x4004ab^M
(gdb) PASS: gdb.dwarf2/dw2-error.exp: break -q main
...

But with with -readnow, we have instead:
...
(gdb) file dw2-error^M
Reading symbols from dw2-error...^M
Dwarf Error: wrong version in compilation unit header (is 153, should be 2, 3,
4 or 5) [in module dw2-error]^M
(gdb) PASS: gdb.dwarf2/dw2-error.exp: file dw2-error
break -q main^M
No symbol table is loaded.  Use the "file" command.^M
(gdb) FAIL: gdb.dwarf2/dw2-error.exp: break -q main
...

So, with -readnow, we somehow also end up without minimal symbols.

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[Bug symtab/26797] [readnow] Dwarf error result in no minimal symbols

[tromey at sourceware dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26797

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tromey at sourceware dot org

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
I think there's another bug on this topic somewhere...
basically the DWARF reader should try harder when it
encounters invalid DWARF.  For example we could issue
a warning but still accept some of the DWARF (say CUs
that do not cause failures); and in any case not
reject the entire objfile.

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[Bug symtab/26797] [readnow] Dwarf error result in no minimal symbols

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26797

--- Comment #2 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom de Vries <vries@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=92b7ae3f9a3333cb7902c8a7676ae7ed5bcd54d0

commit 92b7ae3f9a3333cb7902c8a7676ae7ed5bcd54d0
Author: Tom de Vries <tdevries@suse.de>
Date:   Fri Sep 8 12:27:02 2023 +0200

    [gdb/testsuite] Add kfail in gdb.dwarf2/dwzbuildid.exp

    When running test-case gdb.dwarf2/dwzbuildid.exp using target board
readnow, I
    get:
    ...
    (gdb) file dwzbuildid-mismatch^M
    Reading symbols from dwzbuildid-mismatch...^M
    warning: File "dwzbuildid5.o" has a different build-id, file skipped^M
    could not find '.gnu_debugaltlink' file for dwzbuildid-mismatch^M
    (gdb) delete breakpoints^M
    (gdb) info breakpoints^M
    No breakpoints or watchpoints.^M
    (gdb) break -qualified main^M
    No symbol table is loaded.  Use the "file" command.^M
    Make breakpoint pending on future shared library load? (y or [n]) n^M
    (gdb) FAIL: gdb.dwarf2/dwzbuildid.exp: mismatch: gdb_breakpoint: set
breakpoint at main
    ...

    This is PR symtab/26797: when using readnow, a failure in reading the dwarf
    results in the minimal symbols not being available.

    Add a corresponding KFAIL.

    Tested on x86_64-linux.

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[Bug symtab/26797] [readnow] Dwarf error result in no minimal symbols

[vries at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=26797

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |15.1

--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=91874afabcd6491a00c4b6b79ac21c2b23061c36

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