[ocaml5-issue] Bytecode segfaults on Ephemeron test #181

jmid · 2022-11-11T17:54:44Z

From #88:

one bytecode test hit a segfault on the Ephemeron test on trunk https://github.com/jmid/multicoretests/actions/runs/3444725852/jobs/5747632136#step:8:851

Originally posted by @jmid in #88 (comment)

The Ephemeron GC-fix was cherry picked to 5.0~trunk 21 days ago: Fix ephemeron assertion by allowing for data values that are in the minor heap ocaml/ocaml#11631
The Effect/bytecode fix was cherry picked 5 days ago: Fix construction of Effect.Unhandled in bytecode ocaml/ocaml#11704

I'm wondering whether it is a fresh issue - or caused by one of these that somehow haven't propagated through to install via 5.0.0~trunk and setup-ocaml...

The text was updated successfully, but these errors were encountered:

jmid · 2022-11-13T11:56:56Z

The CI just hit another Ephemeron segfault on 5.0.0~trunk - this one however in native code on Linux:
https://github.com/jmid/multicoretests/actions/runs/3448464623/jobs/5755508518

random seed: 63947905
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential (generating)
[✓] 1000    0    0 1000 / 1000     0.3s STM Ephemeron test sequential

File "src/ephemeron/dune", line 14, characters 0-107:
14 | (rule
15 |  (alias runtest)
16 |  (package multicoretests)
17 |  (deps stm_tests.exe)
18 |  (action (run ./%{deps} --verbose)))
(cd _build/default/src/ephemeron && ./stm_tests.exe --verbose)
Command got signal SEGV.
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test parallel

For future reference I include a copy of the relevant CI log for the above Ephemeron 5.0.0~trunk bytecode mode segfault - before it is deleted from the GitHub Actions cache:

random seed: 382251382
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential (generating)
[✓] 1000    0    0 1000 / 1000     1.9s STM Ephemeron test sequential

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test parallel
[ ]   22    0    0   22 / 1000    62.6s STM Ephemeron test parallel
[ ]   31    0    0   31 / 1000   132.5s STM Ephemeron test parallel
[ ]   42    0    0   42 / 1000   192.9s STM Ephemeron test parallel
[ ]   44    0    0   44 / 1000   261.6s STM Ephemeron test parallel (shrinking:    3.0002)
[ ]   44    0    0   44 / 1000   322.4s STM Ephemeron test parallel (shrinking:    6.0002)
[ ]   44    0    0   44 / 1000   383.7s STM Ephemeron test parallel (shrinking:    8.0004)
[ ]   44    0    0   44 / 1000   445.1s STM Ephemeron test parallel (shrinking:   15.0004)
File "src/ephemeron/dune", line 14, characters 0-107:
14 | (rule
15 |  (alias runtest)
16 |  (package multicoretests)
17 |  (deps stm_tests.exe)
18 |  (action (run ./%{deps} --verbose)))
(cd _build/default/src/ephemeron && ./stm_tests.exe --verbose)
Command got signal SEGV.
[ ]   44    0    0   44 / 1000   505.9s STM Ephemeron test parallel (shrinking:   28.0006)

jmid · 2022-11-14T16:10:24Z

Two native code 5.0.0+trunk CI runs for #189 just hit this Ephemeron segfault.

https://github.com/jmid/multicoretests/actions/runs/3461648589/jobs/5779520524

random seed: 256446672
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential (generating)
[✓] 1000    0    0 1000 / 1000     0.3s STM Ephemeron test sequential

File "src/ephemeron/dune", line 14, characters 0-107:
14 | (rule
15 |  (alias runtest)
16 |  (package multicoretests)
17 |  (deps stm_tests.exe)
18 |  (action (run ./%{deps} --verbose)))
(cd _build/default/src/ephemeron && ./stm_tests.exe --verbose)
Command got signal SEGV.
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test parallel

and https://github.com/jmid/multicoretests/actions/runs/3461587444/jobs/5779384555

random seed: 296407056
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential (generating)
[✓] 1000    0    0 1000 / 1000     0.3s STM Ephemeron test sequential

File "src/ephemeron/dune", line 14, characters 0-107:
14 | (rule
15 |  (alias runtest)
16 |  (package multicoretests)
17 |  (deps stm_tests.exe)
18 |  (action (run ./%{deps} --verbose)))
(cd _build/default/src/ephemeron && ./stm_tests.exe --verbose)
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test parallel

shym · 2022-11-15T15:46:44Z

I just checked that the 3 native runs you mention were using an old OCaml compiler. https://github.com/jmid/multicoretests/actions/runs/3461587444/jobs/5779384555#step:4:457 says: The OCaml toplevel, version 5.0.0+dev6-2022-07-21.
This should hopefully be fixed by #195.

The bytecode run, on the other hand, says: 5.0.0+dev8-2022-10-12. I don’t think the log contains the actual upstream commit used, it might still make sense to investigate this one.

jmid · 2022-11-15T15:54:39Z

Good detective work, sir! 👍

jmid · 2022-11-16T14:59:27Z

The native mode Ephemeron segfaults seems to have been fixed with #195

We are still seeing them on 5.0.0+trunk bytecode though:

On the #195 merge CI run: https://github.com/jmid/multicoretests/actions/runs/3477572101/jobs/5813892424

random seed: 385206433
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential (generating)
[✓] 1000    0    0 1000 / 1000     1.8s STM Ephemeron test sequential

File "src/ephemeron/dune", line 14, characters 0-107:
14 | (rule
15 |  (alias runtest)
16 |  (package multicoretests)
17 |  (deps stm_tests.exe)
18 |  (action (run ./%{deps} --verbose)))
(cd _build/default/src/ephemeron && ./stm_tests.exe --verbose)
Command got signal SEGV.
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test parallel

On a CI run from PR #197: https://github.com/jmid/multicoretests/actions/runs/3478421458/jobs/5815768968

random seed: 248456036
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential (generating)
[✓] 1000    0    0 1000 / 1000     2.2s STM Ephemeron test sequential

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test parallel
[ ]   45    0    0   45 / 1000    74.7s STM Ephemeron test parallel (shrinking:    1)
File "src/ephemeron/dune", line 14, characters 0-107:
14 | (rule
15 |  (alias runtest)
16 |  (package multicoretests)
17 |  (deps stm_tests.exe)
18 |  (action (run ./%{deps} --verbose)))
(cd _build/default/src/ephemeron && ./stm_tests.exe --verbose)
Command got signal SEGV.
[ ]   45    0    0   45 / 1000   135.5s STM Ephemeron test parallel (shrinking:    2)

shym · 2022-11-17T14:00:48Z

Maybe you could revert your change of title then ;-)
Found again when trying hard to trigger it:
https://github.com/shym/multicoretests/actions/runs/3480902528/jobs/5821292658#step:11:541
and I still can’t reproduce it locally using the seed obtain in that log :-/

jmid · 2022-11-18T14:33:04Z

Just when we thought this was bytecode only, ...

CI had a Linux (native) 5.0.0+trunk Ephemeron segfault earlier today on the main branch:
https://github.com/jmid/multicoretests/actions/runs/3495320020/jobs/5851952387

random seed: 463092985
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential (generating)
[✓] 1000    0    0 1000 / 1000     0.4s STM Ephemeron test sequential

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test parallel
File "src/ephemeron/dune", line 14, characters 0-107:
14 | (rule
15 |  (alias runtest)
16 |  (package multicoretests)
17 |  (deps stm_tests.exe)
18 |  (action (run ./%{deps} --verbose)))
(cd _build/default/src/ephemeron && ./stm_tests.exe --verbose)
Command got signal SEGV.
[ ]   45    0    0   45 / 1000    60.5s STM Ephemeron test parallel (shrinking:    3.0002)

jmid · 2022-11-18T16:19:00Z

The CI for the Sys PR just hit a 5.0.0+trunk bytecode Ephemeron segfault as well:
https://github.com/jmid/multicoretests/actions/runs/3496455515/jobs/5854385414

random seed: 89312061
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential (generating)
[✓] 1000    0    0 1000 / 1000     1.9s STM Ephemeron test sequential

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test parallel
File "src/ephemeron/dune", line 14, characters 0-107:
14 | (rule
15 |  (alias runtest)
16 |  (package multicoretests)
17 |  (deps stm_tests.exe)
18 |  (action (run ./%{deps} --verbose)))
[ ]   12    0    0   12 / 1000   434.7s STM Ephemeron test parallel (shrinking:    0.0002)
random seed: 410265529
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 1000     0.0s STM Float Array test sequential
(cd _build/default/src/ephemeron && ./stm_tests.exe --verbose)
Command got signal SEGV.

shym · 2022-11-22T07:47:45Z

After a long bisection, I found it present on all tried commits between trunk and β1 (included): https://github.com/shym/multicoretests/actions/runs/3517413388/jobs/5895155218#step:11:831 but I didn’t manage to get a seed that give reproducibility.

shym · 2022-11-22T07:50:08Z

Maybe another issue should be opened, but I indeed saw quite a few issues on native code:

SEGV on Windows: https://github.com/shym/multicoretests/actions/runs/3516624336/jobs/5893420585#step:8:610
Deadlock on native Linux: https://github.com/shym/multicoretests/actions/runs/3516624341/jobs/5893420839 (2 hours without any log)

jmid · 2022-11-23T09:51:14Z

Another Ephemeron failure on Linux 5.0.0~beta1 bytecode (with some interleaved printing):
https://github.com/jmid/multicoretests/actions/runs/3522096434/jobs/5904675410

random seed: 209315065
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential (generating)
[✓] 1000    0    0 1000 / 1000     2.5s STM Ephemeron test sequential

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test parallel
[ ]   19    0    0   19 / 1000    59.2s STM Ephemeron test parallel
[ ]   34    0    0   34 / 1000   129.8s STM Ephemeron test parallel (shrinking:    0.0002)
File "src/ephemeron/dune", line 14, characters 0-107:
14 | (rule
15 |  (alias runtest)
[ ]   34    0    0   34 / 1000   195.0s STM Ephemeron test parallel (shrinking:    3)
random seed: 40688049
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 1000     0.0s STM Float Array test sequential
16 |  (package multicoretests)
17 |  (deps stm_tests.exe)
18 |  (action (run ./%{deps} --verbose)))
(cd _build/default/src/ephemeron && ./stm_tests.exe --verbose)
Command got signal SEGV.

jmid · 2022-11-23T12:51:48Z

Also seen on Windows 5.0.0+trunk:
https://github.com/jmid/multicoretests/actions/runs/3522215862/jobs/5904929229

random seed: 507906890
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential (generating)
[✓] 1000    0    0 1000 / 1000     0.5s STM Ephemeron test sequential

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test parallel
File "src/ephemeron/dune", line 14, characters 0-111:
14 | (rule
15 |  (alias runtest)
16 |  (package multicoretests)
17 |  (deps stm_tests.exe)
18 |  (action (run ./%{deps} --verbose)))

(cd _build/default/src/ephemeron && ./stm_tests.exe --verbose)
Command exited with code -1073741819.
[ ]  106    0    0  106 / 1000    60.9s STM Ephemeron test parallel

jmid · 2022-11-23T13:01:51Z

Again observed on Linux 5.0.0+trunk bytecode
https://github.com/jmid/multicoretests/actions/runs/3522413690/jobs/5905364853

random seed: 369340211
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential
[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test sequential (generating)
[✓] 1000    0    0 1000 / 1000     2.4s STM Ephemeron test sequential

[ ]    0    0    0    0 / 1000     0.0s STM Ephemeron test parallel
[ ]   35    0    0   35 / 1000    63.0s STM Ephemeron test parallel
[ ]   66    0    0   66 / 1000   163.7s STM Ephemeron test parallel (shrinking:    0.0002)
[ ]   66    0    0   66 / 1000   259.5s STM Ephemeron test parallel (shrinking:    1.0002)
[ ]   66    0    0   66 / 1000   354.3s STM Ephemeron test parallel (shrinking:    1.0004)
[ ]   66    0    0   66 / 1000   449.8s STM Ephemeron test parallel (shrinking:    1.0006)
[ ]   66    0    0   66 / 1000   522.1s STM Ephemeron test parallel (shrinking:    1.0008)
[ ]   66    0    0   66 / 1000   592.4s STM Ephemeron test parallel (shrinking:    2.0002)
[ ]   66    0    0   66 / 1000   663.3s STM Ephemeron test parallel (shrinking:    3)
[ ]   66    0    0   66 / 1000   736.6s STM Ephemeron test parallel (shrinking:    3.0004)
[ ]   66    0    0   66 / 1000   801.2s STM Ephemeron test parallel (shrinking:    4.0002)
[ ]   66    0    0   66 / 1000   874.6s STM Ephemeron test parallel (shrinking:    4.0005)
File "src/ephemeron/dune", line 14, characters 0-107:
14 | (rule
15 |  (alias runtest)
16 |  (package multicoretests)
17 |  (deps stm_tests.exe)
18 |  (action (run ./%{deps} --verbose)))
(cd _build/default/src/ephemeron && ./stm_tests.exe --verbose)
Command got signal SEGV.
[ ]   66    0    0   66 / 1000   936.3s STM Ephemeron test parallel (shrinking:    4.0008)

shym · 2022-11-23T20:16:02Z

On Linux trunk bytecode, this weird result:

random seed: 212405379
generated error fail pass / total     time test name

[ ]    0    0    0    0 / 2000     0.0s STM Ephemeron test parallel
[ ]    0    0    0    0 / 2000     0.0s STM Ephemeron test parallel (generating)
[ ]    8    0    0    8 / 2000   108.2s STM Ephemeron test parallel (shrinking:    0.0002)
[ ]    8    0    0    8 / 2000   201.5s STM Ephemeron test parallel (shrinking:    0.0003)
[ ]    8    0    0    8 / 2000   298.1s STM Ephemeron test parallel (shrinking:    1.0002)
[ ]    8    0    0    8 / 2000   397.2s STM Ephemeron test parallel (shrinking:    2.0002)
[ ]    8    0    0    8 / 2000   490.7s STM Ephemeron test parallel (shrinking:    2.0003)
[ ]    8    0    0    8 / 2000   585.3s STM Ephemeron test parallel (shrinking:    3.0002)
[ ]    8    0    0    8 / 2000   679.3s STM Ephemeron test parallel (shrinking:    4.0002)
[ ]    8    0    0    8 / 2000   772.4s STM Ephemeron test parallel (shrinking:    5.0002)
[ ]    8    0    0    8 / 2000   865.5s STM Ephemeron test parallel (shrinking:    5.0003)
[ ]    8    0    0    8 / 2000   962.4s STM Ephemeron test parallel (shrinking:    7.0002)
[ ]    8    0    0    8 / 2000  1055.1s STM Ephemeron test parallel (shrinking:    7.0003)
[ ]    8    0    0    8 / 2000  1147.8s STM Ephemeron test parallel (shrinking:    7.0004)
[ ]    8    0    0    8 / 2000  1212.6s STM Ephemeron test parallel (shrinking:    9.0002)
[ ]    8    0    0    8 / 2000  1312.4s STM Ephemeron test parallel (shrinking:    9.0004)
[ ]    8    0    0    8 / 2000  1374.2s STM Ephemeron test parallel (shrinking:   11.0002)
[ ]    8    0    0    8 / 2000  1446.2s STM Ephemeron test parallel (shrinking:   11.0005)
[ ]    8    0    0    8 / 2000  1509.1s STM Ephemeron test parallel (shrinking:   13.0005)
[ ]    8    0    0    8 / 2000  1569.8s STM Ephemeron test parallel (shrinking:   17)
[00] file runtime/caml/memory.h; line 191 ### Assertion failed: Field(result, i) == Debug_free_minor
/home/runner/work/_temp/c071cec0-615a-437e-8ec3-36cc15e1c682.sh: line 3: 2563468 Aborted                 (core dumped) opam exec -- dune exec "$ONLY_TEST" -- -v
[ ]    8    0    0    8 / 2000  1630.3s STM Ephemeron test parallel (shrinking:   20.0006)

jmid · 2022-11-24T07:51:33Z

That's a strange error indeed!
It seems to be failing an assertion on a Field load - which is also what could cause strange behaviour in ephe_get_field underlying the weak issue, so there is a chance/hope that it is the same underlying issue 🤔

jmid · 2022-12-01T17:44:18Z

Not spotted since the release of 5.0.0~beta2 with the Weak fix, so closing.

jmid changed the title ~~Bytecode segfault on Ephemeron test~~ Segfaults on Ephemeron test Nov 14, 2022

jmid changed the title ~~Segfaults on Ephemeron test~~ Bytecode segfaults on Ephemeron test Nov 17, 2022

jmid changed the title ~~Bytecode segfaults on Ephemeron test~~ [ocaml5-issue] Bytecode segfaults on Ephemeron test Nov 18, 2022

jmid closed this as completed Dec 1, 2022

jmid added the ocaml5-issue A potential issue in the OCaml5 compiler/runtime label Mar 28, 2023

jmid mentioned this issue Jun 9, 2023

Weak test revisions #365

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[ocaml5-issue] Bytecode segfaults on Ephemeron test #181

[ocaml5-issue] Bytecode segfaults on Ephemeron test #181

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[ocaml5-issue] Bytecode segfaults on Ephemeron test #181

[ocaml5-issue] Bytecode segfaults on Ephemeron test #181

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