gdb/SOURCES/gdb-rhbz-2130624-assert_in_jit_event_handler.patch

From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
From: Tom de Vries <tdevries@suse.de>
Date: Fri, 21 May 2021 15:09:14 +0200
Subject: gdb-rhbz-2130624-assert_in_jit_event_handler.patch

;; Backport "[gdb/breakpoint] Fix assert in jit_event_handler"
;; (Tom de Vries, RHBZ2130624)

Consider a minimal test-case test.c:
...
int main (void) { return 0; }
...
which we can compile into llvm byte code using clang:
...
$ clang -g -S -emit-llvm --target=x86_64-unknown-unknown-elf test.c
...
and then run using lli, which uses the llvm jit:
...
$ lli test.ll
...

If we run this under gdb, we run into an assert:
...
$ gdb -q -batch -ex run --args /usr/bin/lli test.ll
Dwarf Error: Cannot not find DIE at 0x18a936e7 \
  [from module libLLVM.so.10-10.0.1-lp152.30.4.x86_64.debug]

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
src/gdb/jit.c:1178: internal-error: \
  void jit_event_handler(gdbarch*, objfile*): \
  Assertion `jiter->jiter_data != nullptr' failed.
...

This is caused by the following.

When running jit_breakpoint_re_set_internal, we first handle
libLLVM.so.10.debug, and set a jit breakpoint.

Next we handle libLLVM.so.10:
...
(gdb) p the_objfile.original_name
$42 = 0x2494170 "libLLVM.so.10"
...
but the minimal symbols we find are from libLLVM.so.10.debug:
...
(gdb) p reg_symbol.objfile.original_name
$43 = 0x38e7c50 "libLLVM.so.10-10.0.1-lp152.30.4.x86_64.debug"
(gdb) p desc_symbol.objfile.original_name
$44 = 0x38e7c50 "libLLVM.so.10-10.0.1-lp152.30.4.x86_64.debug"
...
and consequently, the objf_data is the one from libLLVM.so.10.debug:
...
      jiter_objfile_data *objf_data
        = get_jiter_objfile_data (reg_symbol.objfile);
...
and so we hit this:
...
      if (objf_data->cached_code_address == addr)
        continue;
...
and no second jit breakpoint is inserted.

Subsequently, the jit breakpoint is triggered and handled, but when finding
the symbol for the breakpoint address we get:
...
(gdb) p jit_bp_sym.objfile.original_name
$52 = 0x2494170 "libLLVM.so.10"
...

The assert 'jiter->jiter_data != nullptr' triggers because it checks
libLLVM.so.10 while the one with jiter_data setup is libLLVM.so.10.debug.

This fixes the assert:
...
       jiter_objfile_data *objf_data
-        = get_jiter_objfile_data (reg_symbol.objfile);
-        = get_jiter_objfile_data (the_objfile);
...
but consequently we'll have two jit breakpoints, so we also make sure we don't
set a jit breakpoint on separate debug objects like libLLVM.so.10.debug.

Tested on x86_64-linux.

gdb/ChangeLog:

2021-05-21  Tom de Vries  <tdevries@suse.de>

	PR breakpoint/27889
	* jit.c (jit_breakpoint_re_set_internal): Skip separate debug
	objects.  Call get_jiter_objfile_data with the_objfile.

diff --git a/gdb/jit.c b/gdb/jit.c
--- a/gdb/jit.c
+++ b/gdb/jit.c
@@ -893,6 +893,10 @@ jit_breakpoint_re_set_internal (struct gdbarch *gdbarch, program_space *pspace)
 {
   for (objfile *the_objfile : pspace->objfiles ())
     {
+      /* Skip separate debug objects.  */
+      if (the_objfile->separate_debug_objfile_backlink != nullptr)
+	continue;
+
       if (the_objfile->skip_jit_symbol_lookup)
 	continue;
 
@@ -919,7 +923,7 @@ jit_breakpoint_re_set_internal (struct gdbarch *gdbarch, program_space *pspace)
 	}
 
       jiter_objfile_data *objf_data
-	= get_jiter_objfile_data (reg_symbol.objfile);
+	= get_jiter_objfile_data (the_objfile);
       objf_data->register_code = reg_symbol.minsym;
       objf_data->descriptor = desc_symbol.minsym;