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Tools: add addr2line_backtrace to extract back-trace info on Unix/Linux #111416

Manually merged
Campbell Barton merged 3 commits from ideasman42/blender:pr-addr2line_backtrace into main 2023-09-06 14:12:55 +02:00
Conversation 5 Commits 3 Files Changed 2 +242 -1
Campbell Barton commented 2023-08-23 04:15:43 +02:00
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Since hiding symbols on Linux, in many cases only addresses are printed.
This utility can run run on the back-trace to replace addresses
with line & function information.

See: ./tools/utils/addr2line_backtrace.py --help for usage information.

Note that some examples online run addr2line directly and use the output in the stack-trace,
while convenient and acceptable in some cases, in my tests addr2line can take over 20 seconds to complete for a single address.
Implement this as a post-process instead. Multi-processing to prevent this taking too long (around ~23 seconds on my system).

Example input, output:

./blender.bin() [0x460a2f]
./blender.bin() [0x1597349]
./blender.bin() [0x1597bd1]
./blender.bin() [0x1894f3f]
./blender.bin() [0x2e957df]
./blender.bin(PyObject_Vectorcall+0x2c) [0x2e87bdc]
./blender.bin(_PyEval_EvalFrameDefault+0x4f84) [0x440194]
./blender.bin() [0x2f60040]
./blender.bin() [0x2ef963a]
./blender.bin(PyObject_GetAttr+0x46) [0x2edbca6]
./blender.bin(_PyEval_EvalFrameDefault+0x1711) [0x43c921]
./blender.bin() [0x2f60040]
./blender.bin() [0x189f141]
./blender.bin() [0x18257f3]
./blender.bin() [0x481764]
./blender.bin() [0x482086]
./blender.bin() [0x48212b]
./blender.bin() [0x4c4546]
./blender.bin() [0x4c4736]
./blender.bin() [0x4c4913]
./blender.bin() [0x4c4c24]
./blender.bin() [0x47b743]
./blender.bin() [0x47c0dd]
./blender.bin() [0x47cf92]
./blender.bin() [0x47614f]
./blender.bin() [0x446145]
/usr/lib/libc.so.6(+0x27cd0) [0x7f13af027cd0]
/usr/lib/libc.so.6(__libc_start_main+0x8a) [0x7f13af027d8a]
./blender.bin() [0x445b45]

./tools/utils/addr2line_backtrace --exe=./blender.bin trace.txt

./blender.bin() ./source/blender/blenlib/intern/system.c:79: BLI_system_backtrace (0x460a2f)
./blender.bin() ./source/blender/makesrna/intern/rna_path.cc:366: rna_path_parse(PointerRNA const*, char const*, PointerRNA*, PropertyRNA**, int*, PointerRNA*, ListBase*, bool) (0x1597349)
./blender.bin() ./source/blender/makesrna/intern/rna_path.cc:540: RNA_path_resolve_full_maybe_null(PointerRNA const*, char const*, PointerRNA*, PropertyRNA**, int*) (0x1597bd1)
./blender.bin() ./source/blender/python/intern/bpy_rna.cc:3827 (discriminator 1): pyrna_struct_path_resolve(BPy_StructRNA*, _object*) (0x1894f3f)
./blender.bin() /scratch/src/cpython/./Include/object.h:537: Py_DECREF (0x2e957df)
./blender.bin(PyObject_Vectorcall+0x2c) /scratch/src/cpython/Objects/call.c:38: _Py_CheckFunctionResult (0x2e87bdc)
./blender.bin(_PyEval_EvalFrameDefault+0x4f84) /scratch/src/cpython/Python/ceval.c:4772: _PyEval_EvalFrameDefault (0x440194)
./blender.bin() /scratch/src/cpython/./Include/internal/pycore_ceval.h:73: _PyEval_EvalFrame (0x2f60040)
./blender.bin() /scratch/src/cpython/./Include/internal/pycore_call.h:93: _PyObject_VectorcallTstate (0x2ef963a)
./blender.bin(PyObject_GetAttr+0x46) /scratch/src/cpython/Objects/object.c:931: PyObject_GetAttr (0x2edbca6)
./blender.bin(_PyEval_EvalFrameDefault+0x1711) /scratch/src/cpython/Python/ceval.c:3464: _PyEval_EvalFrameDefault (0x43c921)
./blender.bin() /scratch/src/cpython/./Include/internal/pycore_ceval.h:73: _PyEval_EvalFrame (0x2f60040)
./blender.bin() ./source/blender/python/intern/bpy_rna.cc:8652 (discriminator 1): bpy_class_call(bContext*, PointerRNA*, FunctionRNA*, ParameterList*) (0x189f141)
./blender.bin() ./source/blender/makesrna/intern/rna_wm.cc:1344: rna_operator_exec_cb(bContext*, wmOperator*) (0x18257f3)
./blender.bin() ./source/blender/windowmanager/intern/wm_event_system.cc:1542 (discriminator 1): wm_operator_invoke(bContext*, wmOperatorType*, wmEvent const*, PointerRNA*, ReportList*, bool, bool) (0x481764)
./blender.bin() ./source/blender/windowmanager/intern/wm_event_system.cc:1765: wm_operator_call_internal(bContext*, wmOperatorType*, PointerRNA*, ReportList*, wmOperatorCallContext, bool, wmEvent const*) (0x482086)
./blender.bin() ./source/blender/windowmanager/intern/wm_event_system.cc:1779: WM_operator_name_call_ptr(bContext*, wmOperatorType*, wmOperatorCallContext, PointerRNA*, wmEvent const*) (0x48212b)
./blender.bin() ./source/blender/windowmanager/intern/wm_toolsystem.cc:677: WM_toolsystem_ref_set_by_id_ex(bContext*, WorkSpace*, bToolKey const*, char const*, bool) (0x4c4546)
./blender.bin() ./source/blender/windowmanager/intern/wm_toolsystem.cc:708: toolsystem_reinit_with_toolref(bContext*, WorkSpace*, bToolRef*) (0x4c4736)
./blender.bin() ./source/blender/windowmanager/intern/wm_toolsystem.cc:780: toolsystem_reinit_ensure_toolref(bContext*, WorkSpace*, bToolKey const*, char const*) (0x4c4913)
./blender.bin() ./source/blender/windowmanager/intern/wm_toolsystem.cc:834: WM_toolsystem_update_from_context(bContext*, WorkSpace*, Scene const*, ViewLayer*, ScrArea*) (0x4c4c24)
./blender.bin() ./source/blender/windowmanager/intern/wm_draw.cc:958: wm_draw_window_offscreen(bContext*, wmWindow*, bool) (0x47b743)
./blender.bin() ./source/blender/windowmanager/intern/wm_draw.cc:1169: wm_draw_window(bContext*, wmWindow*) (0x47c0dd)
./blender.bin() ./source/blender/windowmanager/intern/wm_draw.cc:1565: wm_draw_update(bContext*) (0x47cf92)
./blender.bin() ./source/blender/windowmanager/intern/wm.cc:631: WM_main(bContext*) (0x47614f)
./blender.bin() ./source/creator/creator_args.cc:103: build_defs_init(BuildDefs*, bool) (0x446145)
/usr/lib/libc.so.6(+0x27cd0) ??:0: ?? (0x7f13af027cd0)
/usr/lib/libc.so.6(__libc_start_main+0x8a) ??:0: ?? (0x7f13af027d8a)
./blender.bin() dna_defaults.c:?: _start (0x445b45)
Since hiding symbols on Linux, in many cases only addresses are printed. This utility can run run on the back-trace to replace addresses with line & function information. See: `./tools/utils/addr2line_backtrace.py --help` for usage information. Note that some examples online run `addr2line` directly and use the output in the stack-trace, while convenient and acceptable in some cases, in my tests addr2line can take over 20 seconds to complete for a single address. Implement this as a post-process instead. Multi-processing to prevent this taking too long (around ~23 seconds on my system). ---- Example input, output: ``` ./blender.bin() [0x460a2f] ./blender.bin() [0x1597349] ./blender.bin() [0x1597bd1] ./blender.bin() [0x1894f3f] ./blender.bin() [0x2e957df] ./blender.bin(PyObject_Vectorcall+0x2c) [0x2e87bdc] ./blender.bin(_PyEval_EvalFrameDefault+0x4f84) [0x440194] ./blender.bin() [0x2f60040] ./blender.bin() [0x2ef963a] ./blender.bin(PyObject_GetAttr+0x46) [0x2edbca6] ./blender.bin(_PyEval_EvalFrameDefault+0x1711) [0x43c921] ./blender.bin() [0x2f60040] ./blender.bin() [0x189f141] ./blender.bin() [0x18257f3] ./blender.bin() [0x481764] ./blender.bin() [0x482086] ./blender.bin() [0x48212b] ./blender.bin() [0x4c4546] ./blender.bin() [0x4c4736] ./blender.bin() [0x4c4913] ./blender.bin() [0x4c4c24] ./blender.bin() [0x47b743] ./blender.bin() [0x47c0dd] ./blender.bin() [0x47cf92] ./blender.bin() [0x47614f] ./blender.bin() [0x446145] /usr/lib/libc.so.6(+0x27cd0) [0x7f13af027cd0] /usr/lib/libc.so.6(__libc_start_main+0x8a) [0x7f13af027d8a] ./blender.bin() [0x445b45] ``` `./tools/utils/addr2line_backtrace --exe=./blender.bin trace.txt` ``` ./blender.bin() ./source/blender/blenlib/intern/system.c:79: BLI_system_backtrace (0x460a2f) ./blender.bin() ./source/blender/makesrna/intern/rna_path.cc:366: rna_path_parse(PointerRNA const*, char const*, PointerRNA*, PropertyRNA**, int*, PointerRNA*, ListBase*, bool) (0x1597349) ./blender.bin() ./source/blender/makesrna/intern/rna_path.cc:540: RNA_path_resolve_full_maybe_null(PointerRNA const*, char const*, PointerRNA*, PropertyRNA**, int*) (0x1597bd1) ./blender.bin() ./source/blender/python/intern/bpy_rna.cc:3827 (discriminator 1): pyrna_struct_path_resolve(BPy_StructRNA*, _object*) (0x1894f3f) ./blender.bin() /scratch/src/cpython/./Include/object.h:537: Py_DECREF (0x2e957df) ./blender.bin(PyObject_Vectorcall+0x2c) /scratch/src/cpython/Objects/call.c:38: _Py_CheckFunctionResult (0x2e87bdc) ./blender.bin(_PyEval_EvalFrameDefault+0x4f84) /scratch/src/cpython/Python/ceval.c:4772: _PyEval_EvalFrameDefault (0x440194) ./blender.bin() /scratch/src/cpython/./Include/internal/pycore_ceval.h:73: _PyEval_EvalFrame (0x2f60040) ./blender.bin() /scratch/src/cpython/./Include/internal/pycore_call.h:93: _PyObject_VectorcallTstate (0x2ef963a) ./blender.bin(PyObject_GetAttr+0x46) /scratch/src/cpython/Objects/object.c:931: PyObject_GetAttr (0x2edbca6) ./blender.bin(_PyEval_EvalFrameDefault+0x1711) /scratch/src/cpython/Python/ceval.c:3464: _PyEval_EvalFrameDefault (0x43c921) ./blender.bin() /scratch/src/cpython/./Include/internal/pycore_ceval.h:73: _PyEval_EvalFrame (0x2f60040) ./blender.bin() ./source/blender/python/intern/bpy_rna.cc:8652 (discriminator 1): bpy_class_call(bContext*, PointerRNA*, FunctionRNA*, ParameterList*) (0x189f141) ./blender.bin() ./source/blender/makesrna/intern/rna_wm.cc:1344: rna_operator_exec_cb(bContext*, wmOperator*) (0x18257f3) ./blender.bin() ./source/blender/windowmanager/intern/wm_event_system.cc:1542 (discriminator 1): wm_operator_invoke(bContext*, wmOperatorType*, wmEvent const*, PointerRNA*, ReportList*, bool, bool) (0x481764) ./blender.bin() ./source/blender/windowmanager/intern/wm_event_system.cc:1765: wm_operator_call_internal(bContext*, wmOperatorType*, PointerRNA*, ReportList*, wmOperatorCallContext, bool, wmEvent const*) (0x482086) ./blender.bin() ./source/blender/windowmanager/intern/wm_event_system.cc:1779: WM_operator_name_call_ptr(bContext*, wmOperatorType*, wmOperatorCallContext, PointerRNA*, wmEvent const*) (0x48212b) ./blender.bin() ./source/blender/windowmanager/intern/wm_toolsystem.cc:677: WM_toolsystem_ref_set_by_id_ex(bContext*, WorkSpace*, bToolKey const*, char const*, bool) (0x4c4546) ./blender.bin() ./source/blender/windowmanager/intern/wm_toolsystem.cc:708: toolsystem_reinit_with_toolref(bContext*, WorkSpace*, bToolRef*) (0x4c4736) ./blender.bin() ./source/blender/windowmanager/intern/wm_toolsystem.cc:780: toolsystem_reinit_ensure_toolref(bContext*, WorkSpace*, bToolKey const*, char const*) (0x4c4913) ./blender.bin() ./source/blender/windowmanager/intern/wm_toolsystem.cc:834: WM_toolsystem_update_from_context(bContext*, WorkSpace*, Scene const*, ViewLayer*, ScrArea*) (0x4c4c24) ./blender.bin() ./source/blender/windowmanager/intern/wm_draw.cc:958: wm_draw_window_offscreen(bContext*, wmWindow*, bool) (0x47b743) ./blender.bin() ./source/blender/windowmanager/intern/wm_draw.cc:1169: wm_draw_window(bContext*, wmWindow*) (0x47c0dd) ./blender.bin() ./source/blender/windowmanager/intern/wm_draw.cc:1565: wm_draw_update(bContext*) (0x47cf92) ./blender.bin() ./source/blender/windowmanager/intern/wm.cc:631: WM_main(bContext*) (0x47614f) ./blender.bin() ./source/creator/creator_args.cc:103: build_defs_init(BuildDefs*, bool) (0x446145) /usr/lib/libc.so.6(+0x27cd0) ??:0: ?? (0x7f13af027cd0) /usr/lib/libc.so.6(__libc_start_main+0x8a) ??:0: ?? (0x7f13af027d8a) ./blender.bin() dna_defaults.c:?: _start (0x445b45) ```
Campbell Barton force-pushed pr-addr2line_backtrace from fa4859f355 to 92750af7ac 2023-08-23 04:33:26 +02:00 Compare
Campbell Barton requested review from Bastien Montagne 2023-08-23 04:47:51 +02:00
Campbell Barton requested review from Sergey Sharybin 2023-08-23 04:48:03 +02:00
Sergey Sharybin commented 2023-08-23 10:41:39 +02:00
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Unless there is some smart trick we can quickly do to make BLI_system_backtrace work better I think it is fine to have such script.

I don't think I can test the patch as there seems to be no addr2line available on macOS. From reading the code I did not spot anything obviously wrong.

Unless there is some smart trick we can quickly do to make `BLI_system_backtrace` work better I think it is fine to have such script. I don't think I can test the patch as there seems to be no `addr2line` available on macOS. From reading the code I did not spot anything obviously wrong.
Bastien Montagne requested changes 2023-08-25 16:49:13 +02:00
Bastien Montagne left a comment
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Here's diff of changes I had to do to get it working:

diff --git a/tools/utils/addr2line_backtrace.py b/tools/utils/addr2line_backtrace.py
index e657766e16b..76c34d710c0 100755
--- a/tools/utils/addr2line_backtrace.py
+++ b/tools/utils/addr2line_backtrace.py
@@ -196,12 +196,14 @@ def main() -> None:
         base_path = base_path.rstrip(os.sep) + os.sep
 
     if args.backtraces:
+        if isinstance(args.backtraces, str):
+            args.backtraces = (args.backtraces,)
         for backtrace_filepath in args.backtraces:
             try:
-                with open(backtrace_filepath, "utf-8", encoding="surrogateescape") as fh:
+                with open(backtrace_filepath, "r", encoding="utf-8", errors="surrogateescape") as fh:
                     bactrace_data = fh.read()
             except BaseException as ex:
-                print("Filed to open {:r}, {:s}".format(backtrace_filepath, str(ex)))
+                print("Filed to open {:s}, {:s}".format(backtrace_filepath, str(ex)))
                 continue
 
             addr2line_for_filedata(args.exe, base_path, args.time_command, jobs, bactrace_data)

Further more, with a debug + ASAN build, the default jobs value is unusable on my 16 cores, 64GB machine - it eats the available 48+GB of RAM in no time and then jobs start being killed by the OS. 4 jobs are already using over 30GB of RAM... So think we should default to 1 or 2 jobs max?

In fact, did a check here, running a certain 28 addresses stack (with a lot of addresses in Python itself and not Blender) through this script took over 1h30 mins, while a single direct call to addr2lines with all 28 addresses took about 35mins. So think would be worth it to:

  • Default to a single job
  • Pack addresses into as little calls to addr2lines as possible?
Here's diff of changes I had to do to get it working: ``` diff --git a/tools/utils/addr2line_backtrace.py b/tools/utils/addr2line_backtrace.py index e657766e16b..76c34d710c0 100755 --- a/tools/utils/addr2line_backtrace.py +++ b/tools/utils/addr2line_backtrace.py @@ -196,12 +196,14 @@ def main() -> None: base_path = base_path.rstrip(os.sep) + os.sep if args.backtraces: + if isinstance(args.backtraces, str): + args.backtraces = (args.backtraces,) for backtrace_filepath in args.backtraces: try: - with open(backtrace_filepath, "utf-8", encoding="surrogateescape") as fh: + with open(backtrace_filepath, "r", encoding="utf-8", errors="surrogateescape") as fh: bactrace_data = fh.read() except BaseException as ex: - print("Filed to open {:r}, {:s}".format(backtrace_filepath, str(ex))) + print("Filed to open {:s}, {:s}".format(backtrace_filepath, str(ex))) continue addr2line_for_filedata(args.exe, base_path, args.time_command, jobs, bactrace_data) ``` Further more, with a debug + ASAN build, the default jobs value is unusable on my 16 cores, 64GB machine - it eats the available 48+GB of RAM in no time and then jobs start being killed by the OS. 4 jobs are already using over 30GB of RAM... So think we should default to 1 or 2 jobs max? In fact, did a check here, running a certain 28 addresses stack (with a lot of addresses in Python itself and not Blender) through this script took over 1h30 mins, while a single direct call to `addr2lines` with all 28 addresses took about 35mins. So think would be worth it to: * Default to a single job * Pack addresses into as little calls to `addr2lines` as possible?
tools/utils/addr2line_backtrace.py Outdated
@ -0,0 +196,4 @@
base_path = base_path.rstrip(os.sep) + os.sep
if args.backtraces:
for backtrace_filepath in args.backtraces:
Bastien Montagne commented 2023-08-25 15:11:11 +02:00
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does not work if there is only one file path given, as args.backtraces is a single string then.

does not work if there is only one file path given, as `args.backtraces` is a single string then.
ideasman42 marked this conversation as resolved
tools/utils/addr2line_backtrace.py Outdated
@ -0,0 +198,4 @@
if args.backtraces:
for backtrace_filepath in args.backtraces:
try:
with open(backtrace_filepath, "utf-8", encoding="surrogateescape") as fh:
Bastien Montagne commented 2023-08-25 15:11:26 +02:00
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hrrrrmmmmmm....

hrrrrmmmmmm....
ideasman42 marked this conversation as resolved
tools/utils/addr2line_backtrace.py Outdated
@ -0,0 +201,4 @@
with open(backtrace_filepath, "utf-8", encoding="surrogateescape") as fh:
bactrace_data = fh.read()
except BaseException as ex:
print("Filed to open {:r}, {:s}".format(backtrace_filepath, str(ex)))
Bastien Montagne commented 2023-08-25 15:11:51 +02:00
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{:r} does not exists in string format types specifiers

`{:r}` does not exists in string format [types specifiers](https://docs.python.org/3.10/library/string.html#format-string-syntax)
ideasman42 marked this conversation as resolved
Campbell Barton force-pushed pr-addr2line_backtrace from 8b7379dca8 to 49cbd4c3b1 2023-08-26 08:22:17 +02:00 Compare
Bastien Montagne commented 2023-08-28 19:10:03 +02:00
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@ideasman42 I think there's been a problem with your merge or rebase?

@ideasman42 I think there's been a problem with your merge or rebase?
Brecht Van Lommel commented 2023-09-04 10:20:12 +02:00
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I think we can pass -rdynamic to the linker to get the symbols again in backtraces:
https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html#index-rdynamic

But as before, there are not going to be line numbers. So this is still useful.

I think we can pass `-rdynamic` to the linker to get the symbols again in backtraces: https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html#index-rdynamic But as before, there are not going to be line numbers. So this is still useful.
Campbell Barton force-pushed pr-addr2line_backtrace from 49cbd4c3b1 to 76fdef4bcf 2023-09-05 03:47:48 +02:00 Compare
Bastien Montagne commented 2023-09-05 10:06:50 +02:00
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I would still rather pack several addresses within a single call to addr2line, especially with debug builds this tools is extremely greedy with memory, so it's way better to e.g. split 32+ addresses between 4 processes, rather than calling the tool 32+ times individually, making it reload and reparse the whole binary every time.

Otherwise LGTM now.

@brecht I tried using this -dynamic flag before, for me it still only gives me pure addresses backtrace, without any kind of symbol resolution...

I would still rather pack several addresses within a single call to `addr2line`, especially with debug builds this tools is extremely greedy with memory, so it's way better to e.g. split 32+ addresses between 4 processes, rather than calling the tool 32+ times individually, making it reload and reparse the whole binary every time. Otherwise LGTM now. @brecht I tried using this `-dynamic` flag before, for me it still only gives me pure addresses backtrace, without any kind of symbol resolution...
Bastien Montagne requested changes 2023-09-05 10:08:36 +02:00
tools/utils/addr2line_backtrace.py Outdated
@ -0,0 +65,4 @@
(exe, base_path, time_command) = shared_args
cmd = (
"addr2line",
addr,
Bastien Montagne commented 2023-09-05 10:08:02 +02:00
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This can be a list of several addresses instead of a single one.

This can be a list of several addresses instead of a single one.
ideasman42 marked this conversation as resolved
tools/utils/addr2line_backtrace.py Outdated
@ -0,0 +162,4 @@
addr_len = len(addr_set)
with multiprocessing.Pool(jobs) as pool:
for i, (addr, result) in enumerate(pool.imap_unordered(addr2line_fn, addr2line_args), 1):
Bastien Montagne commented 2023-09-05 10:08:32 +02:00
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Should be packed so that each submissions contains as many addresses as possible

Should be packed so that each submissions contains as many addresses as possible
ideasman42 marked this conversation as resolved
Campbell Barton force-pushed pr-addr2line_backtrace from 76fdef4bcf to b40dbe74dc 2023-09-05 13:49:54 +02:00 Compare
Campbell Barton requested review from Bastien Montagne 2023-09-05 14:20:47 +02:00
Campbell Barton commented 2023-09-05 14:23:46 +02:00
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Updated to default to 4 cores to avoid using too much memory.

Details:

  • This can use up to 2gb per addr2line call.
  • Tested with 28 addresses calling addr2line one by one compared to a single addr2line call with all addresses - which is around twice as fast.
Updated to default to 4 cores to avoid using too much memory. Details: - This can use up to 2gb per addr2line call. - Tested with 28 addresses calling addr2line one by one compared to a single addr2line call with all addresses - which is around twice as fast.
Campbell Barton force-pushed pr-addr2line_backtrace from b40dbe74dc to bab94c6385 2023-09-05 14:36:11 +02:00 Compare
Bastien Montagne approved these changes 2023-09-06 10:45:29 +02:00
Bastien Montagne left a comment
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Works great now, thanks!

Works great now, thanks!
Campbell Barton manually merged commit ddf881ad9b into main 2023-09-06 14:12:55 +02:00
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Reference: blender/blender#111416
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