chore: support apple m1 backtraces #354
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should close #326 if I understand this issue correctly |
semgrep-ci bot
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Aug 20, 2025
This PR adds beautiful segfaults ❤️ . Whenever we segfault in OCaml code, we should now be provided with some backtraces, including function name, file # and potentially code snippets:
<details>
<summary>Backtrace</summary>
```
____
/＞ フ
| _ _ |
/` ミ_x ノ
/ |
/ ヽ ﾉ
| | | |
／￣ | | |
| (￣ヽ＿ヽ)_)_)
＼二つ
Segfault cat says:
process 5514 received signal:
> "Segmentation fault"
faulting address: 0x01
Stack trace (most recent call last):
#14 Object "", at 0xffffffffffffffff, in
#13 Source "src/env/__libc_start_main.c", line 95, in libc_start_main_stage2 [0x2f61b77]
#12 Source "runtime/main.c", line 37, in main [0x41f94f]
#11 | Source "runtime/startup_nat.c", line 146, in caml_startup
| Source "runtime/startup_nat.c", line 139, in caml_startup_exn
Source "runtime/startup_nat.c", line 134, in caml_main [0x2f5a16f]
#10 | Source "runtime/startup_nat.c", line 86, in caml_startup_common
Source "runtime/startup_nat.c", line 127, in caml_startup_common [0x2f5a0d7]
#9 Object "/src/semgrep-pro/_build/default/OSS/src/main/Main.exe", at 0x2f5a69f, in caml_start_program
#8 Object "/src/semgrep-pro/_build/default/OSS/src/main/Main.exe", at 0x467227, in caml_program
#7 Source "OSS/src/main/Main.ml", line 91, in camlDune__exe__Main.entry [0x4798a7]
88: * core' and './dune' install section. We use the argv[0] trick below to decide
89: * whether the user wants the semgrep-core or osemgrep behavior. *)
90: let () =
> 91: Cap.main (fun (caps : Cap.all_caps) ->
92: let argv = CapSys.argv caps#argv in
93: let argv0 =
94: (* remove the possible ".exe" extension for Windows and ".bc" *)
#6 Source "OSS/libs/commons/UCommon.ml", line 42, in camlUCommon.exn_to_real_unixexit_351 [0x22ce38b]
40: (* now in prelude: exception UnixExit of int *)
41: let exn_to_real_unixexit f =
> 42: try f () with
43: (* If it is a normal exit just info log it *)
44: | UnixExit (0, msg) ->
45: (* nosemgrep: no-logs-in-library *)
#5 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x22c28af]
50: *)
51: let protect ~finally work =
52: (* nosemgrep: no-fun-protect *)
> 53: try Fun.protect ~finally work with
54: | Fun.Finally_raised exn1 as exn ->
55: (* Just re-raise whatever exception was raised during a 'finally',
56: * drop 'Finally_raised'.
#4 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x271037b]
#3 Source "OSS/libs/commons/UCommon.ml", line 63, in camlUCommon.pp_do_in_zero_box_432 [0x22ce643]
61: let pp_do_in_zero_box f =
62: Format.open_box 0;
> 63: f ();
64: Format.close_box ()
65:
66: (* nosemgrep: no-ref-declarations-at-top-scope *)
#2 Source "OSS/libs/commons/UCommon.ml", line 124, in camlUCommon.fun_1206 [0x22ceb43]
121: finalize
122: (fun () ->
123: pp_do_in_zero_box (fun () ->
> 124: try f () with
125: (* <---- here it is *)
126: | Unix.Unix_error (e, fm, argm) ->
127: pr2
#1 Source "OSS/src/core_cli/Core_CLI.ml", line 663, in camlCore_CLI.decide_if_eio_6164 [0x621ae7]
660: (*****************************************************************************)
661:
662: let run caps (config : Core_scan_config.t) : unit =
> 663: let res = Core_scan.scan caps config in
664: output_core_results
665: (caps :> < Cap.stdout ; Cap.stderr ; Cap.exit >)
666: res config
#0 Source "OSS/src/core_scan/Core_scan.ml", line 1047, in camlCore_scan.scan_5956 [0x927a74]
1044: Common.with_time (fun () -> applicable_rules_of_config config)
1045: in
1046: let a : unit -> unit = Obj.magic 0 in
>1047: a ();
1048: let res : Core_result.t = scan_exn caps config timed_rules in
1049: Ok
1050: (res
Segmentation fault
```
</details>
We also get backtraces on these signals:
```
SIGABRT, // Abort signal from abort(3)
SIGBUS, // Bus error (bad memory access)
SIGFPE, // Floating point exception
SIGILL, // Illegal Instruction
SIGIOT, // IOT trap. A synonym for SIGABRT
SIGQUIT, // Quit from keyboard
SIGSEGV, // Invalid memory reference
SIGSYS, // Bad argument to routine (SVr4)
SIGTRAP, // Trace/breakpoint trap
SIGXCPU, // CPU time limit exceeded (4.2BSD)
SIGXFSZ, // File size limit exceeded (4.2BSD)
#if defined(BACKWARD_SYSTEM_DARWIN)
SIGEMT, // emulation instruction executed
```
and I have taken the liberty of adding SIGUSR1 a la https://github.com/surma/stacksignal.
## How
This PR wraps https://github.com/bombela/backward-cpp with a few modifications to get things working on linux in docker on m1 macs, and m1 macs themselves:
bombela/backward-cpp#354
bombela/backward-cpp#347
This library works by walking the stack after a segfault, and then reading dwarf symbols to get the info.
Dependencies:
This PR adds a few more libraries, backward cpp (mit), and then libunwind, libdw (elfutils), and libdwarf which are all lgplv2. I tried to ensure that they will be statically linked/bundled where necessary, so we should be all good.
Test plan:
Manually introduced an ocaml segfault (see above example).
Then ran this on one occurring in pcre:
<details>
<summary>Backtrace</summary>
```
> "Segmentation fault: 11"
Stack trace (most recent call last):
#10 Object "Main.exe", at 0x103150c2b, in camlCore_scan.scan_5956 + 123
#9 Object "Main.exe", at 0x1053e6883, in caml_start_program + 131
#8 Object "Main.exe", at 0x1029a1db3, in caml_program + 56027
#7 Object "Main.exe", at 0x1029b5627, in camlDune__exe__Main.entry + 111
#6 Object "Main.exe", at 0x104bedf4b, in camlUCommon.exn_to_real_unixexit_351 + 51
#5 Object "Main.exe", at 0x104be221f, in camlCommon.protect_307 + 39
#4 Object "Main.exe", at 0x10501fddb, in camlStdlib__Fun.protect_326 + 107
#3 Object "Main.exe", at 0x104bee203, in camlUCommon.pp_do_in_zero_box_432 + 51
#2 Object "Main.exe", at 0x104bee703, in camlUCommon.fun_1206 + 51
#1 Object "Main.exe", at 0x1029eab17, in camlPro_core_CLI.run_898 + 1687
#0 Object "Main.exe", at 0x103150c3c, in camlCore_scan.scan_5956 + 140
```
</details>
and a marshalling segfault out in the wild:
<details>
<summary>Backtrace</summary>
```
Stack trace (most recent call last):
#31 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#30 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#29 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#28 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#27 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#26 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#25 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#24 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#23 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#22 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#21 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#20 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#19 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#18 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#17 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#16 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#15 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#14 Source "src/pro_scan/Pro_scan.ml", line 606, in camlPro_scan.scan_exn_4292 [0x60bdb7]
#13 Source "src/core/opentelemetry.ml", line 1312, in camlOpentelemetry.with__2580 [0x23b2f52]
#12 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#11 Source "OSS/src/core_scan/Core_scan.ml", line 738, in camlCore_scan.fun_7477 [0xbe214b]
#10 Source "OSS/src/core_scan/Core_scan.ml", line 628, in camlCore_scan.parmap_map_5319 [0xbe4c67]
#9 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#8 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#7 Source "OSS/libs/parallelism/Parmap_.ml", line 169, in camlParmap_.parmap_479 [0x238ccbe]
#6 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#5 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#4 Source "src/parmap.ml", line 401, in camlParmap.mapper_1352 [0x2390ca3]
#3 Source "src/parmap.ml", line 115, in camlParmap.unmarshal_860 [0x238f495]
#2 Object "/usr/lib/python3.12/site-packages/semgrep/bin/semgrep-core-proprietary", at 0x30a695a, in caml_c_call
#1 Source "runtime/intern.c", line 993, in caml_input_value_from_block [0x308b6fb]
#0 Source "runtime/intern.c", line 762, in caml_parse_header [0x308a109]
```
</details>
synced from Pro a5dc2cd7fd0d8736642572760d2ff6a05adbed4e
yosefAlsuhaibani
pushed a commit
to semgrep/semgrep
that referenced
this pull request
Aug 20, 2025
This PR adds beautiful segfaults ❤️ . Whenever we segfault in OCaml code, we should now be provided with some backtraces, including function name, file # and potentially code snippets:
<details>
<summary>Backtrace</summary>
```
____
/＞ フ
| _ _ |
/` ミ_x ノ
/ |
/ ヽ ﾉ
| | | |
／￣ | | |
| (￣ヽ＿ヽ)_)_)
＼二つ
Segfault cat says:
process 5514 received signal:
> "Segmentation fault"
faulting address: 0x01
Stack trace (most recent call last):
#14 Object "", at 0xffffffffffffffff, in
#13 Source "src/env/__libc_start_main.c", line 95, in libc_start_main_stage2 [0x2f61b77]
#12 Source "runtime/main.c", line 37, in main [0x41f94f]
#11 | Source "runtime/startup_nat.c", line 146, in caml_startup
| Source "runtime/startup_nat.c", line 139, in caml_startup_exn
Source "runtime/startup_nat.c", line 134, in caml_main [0x2f5a16f]
#10 | Source "runtime/startup_nat.c", line 86, in caml_startup_common
Source "runtime/startup_nat.c", line 127, in caml_startup_common [0x2f5a0d7]
#9 Object "/src/semgrep-pro/_build/default/OSS/src/main/Main.exe", at 0x2f5a69f, in caml_start_program
#8 Object "/src/semgrep-pro/_build/default/OSS/src/main/Main.exe", at 0x467227, in caml_program
#7 Source "OSS/src/main/Main.ml", line 91, in camlDune__exe__Main.entry [0x4798a7]
88: * core' and './dune' install section. We use the argv[0] trick below to decide
89: * whether the user wants the semgrep-core or osemgrep behavior. *)
90: let () =
> 91: Cap.main (fun (caps : Cap.all_caps) ->
92: let argv = CapSys.argv caps#argv in
93: let argv0 =
94: (* remove the possible ".exe" extension for Windows and ".bc" *)
#6 Source "OSS/libs/commons/UCommon.ml", line 42, in camlUCommon.exn_to_real_unixexit_351 [0x22ce38b]
40: (* now in prelude: exception UnixExit of int *)
41: let exn_to_real_unixexit f =
> 42: try f () with
43: (* If it is a normal exit just info log it *)
44: | UnixExit (0, msg) ->
45: (* nosemgrep: no-logs-in-library *)
#5 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x22c28af]
50: *)
51: let protect ~finally work =
52: (* nosemgrep: no-fun-protect *)
> 53: try Fun.protect ~finally work with
54: | Fun.Finally_raised exn1 as exn ->
55: (* Just re-raise whatever exception was raised during a 'finally',
56: * drop 'Finally_raised'.
#4 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x271037b]
#3 Source "OSS/libs/commons/UCommon.ml", line 63, in camlUCommon.pp_do_in_zero_box_432 [0x22ce643]
61: let pp_do_in_zero_box f =
62: Format.open_box 0;
> 63: f ();
64: Format.close_box ()
65:
66: (* nosemgrep: no-ref-declarations-at-top-scope *)
#2 Source "OSS/libs/commons/UCommon.ml", line 124, in camlUCommon.fun_1206 [0x22ceb43]
121: finalize
122: (fun () ->
123: pp_do_in_zero_box (fun () ->
> 124: try f () with
125: (* <---- here it is *)
126: | Unix.Unix_error (e, fm, argm) ->
127: pr2
#1 Source "OSS/src/core_cli/Core_CLI.ml", line 663, in camlCore_CLI.decide_if_eio_6164 [0x621ae7]
660: (*****************************************************************************)
661:
662: let run caps (config : Core_scan_config.t) : unit =
> 663: let res = Core_scan.scan caps config in
664: output_core_results
665: (caps :> < Cap.stdout ; Cap.stderr ; Cap.exit >)
666: res config
#0 Source "OSS/src/core_scan/Core_scan.ml", line 1047, in camlCore_scan.scan_5956 [0x927a74]
1044: Common.with_time (fun () -> applicable_rules_of_config config)
1045: in
1046: let a : unit -> unit = Obj.magic 0 in
>1047: a ();
1048: let res : Core_result.t = scan_exn caps config timed_rules in
1049: Ok
1050: (res
Segmentation fault
```
</details>
We also get backtraces on these signals:
```
SIGABRT, // Abort signal from abort(3)
SIGBUS, // Bus error (bad memory access)
SIGFPE, // Floating point exception
SIGILL, // Illegal Instruction
SIGIOT, // IOT trap. A synonym for SIGABRT
SIGQUIT, // Quit from keyboard
SIGSEGV, // Invalid memory reference
SIGSYS, // Bad argument to routine (SVr4)
SIGTRAP, // Trace/breakpoint trap
SIGXCPU, // CPU time limit exceeded (4.2BSD)
SIGXFSZ, // File size limit exceeded (4.2BSD)
#if defined(BACKWARD_SYSTEM_DARWIN)
SIGEMT, // emulation instruction executed
```
and I have taken the liberty of adding SIGUSR1 a la https://github.com/surma/stacksignal.
## How
This PR wraps https://github.com/bombela/backward-cpp with a few modifications to get things working on linux in docker on m1 macs, and m1 macs themselves:
bombela/backward-cpp#354
bombela/backward-cpp#347
This library works by walking the stack after a segfault, and then reading dwarf symbols to get the info.
Dependencies:
This PR adds a few more libraries, backward cpp (mit), and then libunwind, libdw (elfutils), and libdwarf which are all lgplv2. I tried to ensure that they will be statically linked/bundled where necessary, so we should be all good.
Test plan:
Manually introduced an ocaml segfault (see above example).
Then ran this on one occurring in pcre:
<details>
<summary>Backtrace</summary>
```
> "Segmentation fault: 11"
Stack trace (most recent call last):
#10 Object "Main.exe", at 0x103150c2b, in camlCore_scan.scan_5956 + 123
#9 Object "Main.exe", at 0x1053e6883, in caml_start_program + 131
#8 Object "Main.exe", at 0x1029a1db3, in caml_program + 56027
#7 Object "Main.exe", at 0x1029b5627, in camlDune__exe__Main.entry + 111
#6 Object "Main.exe", at 0x104bedf4b, in camlUCommon.exn_to_real_unixexit_351 + 51
#5 Object "Main.exe", at 0x104be221f, in camlCommon.protect_307 + 39
#4 Object "Main.exe", at 0x10501fddb, in camlStdlib__Fun.protect_326 + 107
#3 Object "Main.exe", at 0x104bee203, in camlUCommon.pp_do_in_zero_box_432 + 51
#2 Object "Main.exe", at 0x104bee703, in camlUCommon.fun_1206 + 51
#1 Object "Main.exe", at 0x1029eab17, in camlPro_core_CLI.run_898 + 1687
#0 Object "Main.exe", at 0x103150c3c, in camlCore_scan.scan_5956 + 140
```
</details>
and a marshalling segfault out in the wild:
<details>
<summary>Backtrace</summary>
```
Stack trace (most recent call last):
#31 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#30 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#29 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#28 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#27 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#26 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#25 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#24 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#23 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#22 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#21 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#20 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#19 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#18 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#17 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#16 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#15 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#14 Source "src/pro_scan/Pro_scan.ml", line 606, in camlPro_scan.scan_exn_4292 [0x60bdb7]
#13 Source "src/core/opentelemetry.ml", line 1312, in camlOpentelemetry.with__2580 [0x23b2f52]
#12 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#11 Source "OSS/src/core_scan/Core_scan.ml", line 738, in camlCore_scan.fun_7477 [0xbe214b]
#10 Source "OSS/src/core_scan/Core_scan.ml", line 628, in camlCore_scan.parmap_map_5319 [0xbe4c67]
#9 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#8 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#7 Source "OSS/libs/parallelism/Parmap_.ml", line 169, in camlParmap_.parmap_479 [0x238ccbe]
#6 Source "OSS/libs/commons/Common.ml", line 53, in camlCommon.protect_307 [0x240497b]
#5 Source "/root/.opam/5.3.0/.opam-switch/build/ocaml-compiler.5.3.0/stdlib/fun.ml", line 34, in camlStdlib__Fun.protect_326 [0x27bf47a]
#4 Source "src/parmap.ml", line 401, in camlParmap.mapper_1352 [0x2390ca3]
#3 Source "src/parmap.ml", line 115, in camlParmap.unmarshal_860 [0x238f495]
#2 Object "/usr/lib/python3.12/site-packages/semgrep/bin/semgrep-core-proprietary", at 0x30a695a, in caml_c_call
#1 Source "runtime/intern.c", line 993, in caml_input_value_from_block [0x308b6fb]
#0 Source "runtime/intern.c", line 762, in caml_parse_header [0x308a109]
```
</details>
synced from Pro a5dc2cd7fd0d8736642572760d2ff6a05adbed4e
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Hey! back again with some more support. This works for me on m1 macs. got the info from here: https://github.com/llvm/llvm-project/blob/368c02e3ec44e5418626f46abebcc22a69c7f66d/libunwind/src/Registers.hpp and /Library/Developer/CommandLineTools/SDKs/MacOSX14.4.sdk/usr/include/mach/arm/_structs.h