"Got signal before environment was installed on our thread"

[Daniel Kochmański]

I dont think its related to shared vs static - rather two gc running concurrently. Try commenting out GC_init call in ecl and see what happens.

Do you need sigchld for anything? Run-program was rewritten and sigchld handling wasnt viable option anymore for it.

Im on phone, will be avail after the weekend.

Regards, D.

Dnia 1 września 2017 14:47:57 CEST, Dima Pasechnik <dimpase+ecl at gmail.com> napisał(a):
>Hi Daniel,
>Thanks for the message. The scenario you talk about only happens if GC
>is a shared library, right?
>
>I've rebuilt GC disabling shared libs, and ECL doing static linking to
>GC.
>And I still get very similar segfaults:
>
>;;; ECL C Backtrace
>;;;    0 ecl_internal_error (0x87d79b375)
>;;;    1 init_unixint (0x87d7c17e0)
>;;;    2 init_unixint (0x87d7c1582)
>;;;    3 pthread_sigmask (0x80103779d)
>;;;    4 pthread_getspecific (0x801036d6f)
>;;;    5 unknown (0x7ffffffff193)
>;;;    6 GC_push_current_stack (0x87d7ef7c3)
>;;;    7 GC_with_callee_saves_pushed (0x87d7f7360)
>;;;    8 GC_push_roots (0x87d7ef9c2)
>;;;    9 GC_mark_some (0x87d7ec97c)
>;;;   10 GC_stopped_mark (0x87d7e6b7a)
>;;;   11 GC_try_to_collect_inner (0x87d7e6a75)
>;;;   12 GC_init (0x87d7f08ea)
>;;;   13 init_alloc (0x87d7d5669)
>;;;   14 cl_boot (0x87d69f66b)
>...
>
>And a very similar picture on the develop branch of ECL - although
>I had to change our code, as  in particular
>ECL_OPT_TRAP_SIGCHLD is gone...
>
>So, what can it be? Some signals issue?
>
>Thanks,
>Dima
>
>On Fri, Sep 1, 2017 at 7:38 AM, Daniel Kochmański
><daniel at turtleware.eu> wrote:
>> Hey Dima,
>>
>> this looks like the issue with having GC initialized before ECL kicks
>in.
>> See https://gitlab.com/embeddable-common-lisp/ecl/issues/371 for a
>> discussion about this problem. Basically some other component already
>called
>> GC_init and ECL calls it once more. It's arguably not a bug.
>>
>> Best regards,
>>
>> Daniel
>>
>>
>> On 31.08.2017 15:29, Dima Pasechnik wrote:
>>>
>>> Dear all,
>>>
>>> I'm struggling to understand strange segfaults coming from
>>> ECL(+Maxima) on FreeBSD embedded into Python; they typically look as
>>> follows:
>>>
>>> Got signal before environment was installed on our thread
>>>    [2: No such file or directory]
>>>
>>> ;;; ECL C Backtrace
>>> ;;;    0 ecl_internal_error (0x87d790765)
>>> ;;;    1 init_unixint (0x87d7b6bd0)
>>> ;;;    2 init_unixint (0x87d7b6972)
>>> ;;;    3 pthread_sigmask (0x80103779d)
>>> ;;;    4 pthread_getspecific (0x801036d6f)
>>> ;;;    5 unknown (0x7ffffffff193)
>>> ;;;    6 GC_push_all_stacks (0x87db1ea2c)
>>> ;;;    7 GC_mark_some (0x87db12eec)
>>> ;;;    8 GC_stopped_mark (0x87db09baa)
>>> ;;;    9 GC_try_to_collect_inner (0x87db09a75)
>>> ;;;   10 GC_init (0x87db16f4f)
>>> ;;;   11 init_alloc (0x87d7caa59)
>>> ;;;   12 cl_boot (0x87d694a5b)
>>> ;;;   13 initecl (0x87d218340)
>>> ;;;   14 initecl (0x87d20a43f)
>>> ;;;   15 initecl (0x87d207e28)
>>> ;;;   16 _PyImport_LoadDynamicModule (0x800b3ed1c)
>>> ;;;   17 PyImport_AppendInittab (0x800b3d71f)
>>> ;;;   18 PyImport_AppendInittab (0x800b3d1a8)
>>> ;;;   19 PyImport_ImportModuleLevel (0x800b3c2ce)
>>> ;;;   20 _PyBuiltin_Init (0x800b162d7)
>>> ;;;   21 PyObject_Call (0x800a7d3e3)
>>> ;;;   22 PyEval_EvalFrameEx (0x800b2121c)
>>> ;;;   23 PyEval_EvalCodeEx (0x800b1b5d4)
>>> ;;;   24 PyEval_EvalCode (0x800b1ad96)
>>> ;;;   25 PyImport_ExecCodeModuleEx (0x800b3ad11)
>>> ;;;   26 PyImport_AppendInittab (0x800b3ddb8)
>>> ;;;   27 PyImport_AppendInittab (0x800b3d71f)
>>> ;;;   28 PyImport_AppendInittab (0x800b3d1a8)
>>> ;;;   29 PyImport_ImportModuleLevel (0x800b3c2ce)
>>> ;;;   30 _PyBuiltin_Init (0x800b162d7)
>>> ;;;   31 PyEval_EvalFrameEx (0x800b22dd1)
>>> Segmentation fault (core dumped)
>>>
>>> It looks as if ECL (version 16.1.2) is being called before an
>>> initialisation is complete, but it it possible to say more without a
>>> debugger?
>>>
>>> More details: is is on FreeBSD 11.0, clang 3.8.0, GC version 7.6.0
>>> with libatomic_ops version 7.4.6.
>>> And only reproducible on FreeBSD.
>>>
>>> ECL is built with --disable-threads; GC is built with or without
>>> threads---result is still the same.
>>> (so it's unclear to me where pthread_* calls in the trace
>>> come from).
>>>
>>> Thanks,
>>> Dima
>>>
>>> PS. the segfault is at the bottom of
>>> https://trac.sagemath.org/ticket/22679#comment:87
>>>
>>

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