Hi Marc,

Do you have any custom type handlers registered via addTypeHandler()? Is it
possible that the handler class has gone out-of-scope (been destroyed) by
the time the encoder is executed?

-Kenton

On Fri, Mar 2, 2018 at 10:18 AM, Marc Sune <m...@voltanet.io> wrote:

> > That's about all that I can get, even though capnproto is compiled with
> DEBUG.
>
> Or shall I say, it should :/
>
>
> On Friday, March 2, 2018 at 7:17:02 PM UTC+1, Marc Sune wrote:
>>
>> Hi guys,
>>
>> I am experiencing a _very_ strange segfault during JSON encoding of
>> message:
>>
>> ```
>> Program received signal SIGSEGV, Segmentation fault.
>> [Switching to Thread 27946]
>> 0x0000000001e4b81a in std::__detail::_Hashtable_ebo_helper<1,
>> capnp::(anonymous namespace)::TypeHash, 
>> true>::_S_cget(std::__detail::_Hashtable_ebo_helper<1,
>> capnp::(anonymous namespace)::TypeHash, true> const&) ()
>> (gdb) bt
>> #0  0x0000000001e4b81a in std::__detail::_Hashtable_ebo_helper<1,
>> capnp::(anonymous namespace)::TypeHash, 
>> true>::_S_cget(std::__detail::_Hashtable_ebo_helper<1,
>> capnp::(anonymous namespace)::TypeHash, true> const&) ()
>> #1  0x0000000001e4b11a in std::__detail::_Hash_code_base<capnp::Type,
>> std::pair<capnp::Type const, capnp::JsonCodec::HandlerBase*>,
>> std::__detail::_Select1st, capnp::(anonymous namespace)::TypeHash,
>> std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash,
>> true>::_M_h1() const ()
>> #2  0x0000000001e4a976 in std::__detail::_Hash_code_base<capnp::Type,
>> std::pair<capnp::Type const, capnp::JsonCodec::HandlerBase*>,
>> std::__detail::_Select1st, capnp::(anonymous namespace)::TypeHash,
>> std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash,
>> true>::_M_hash_code(capnp::Type const&) const ()
>> #3  0x0000000001e4a401 in std::_Hashtable<capnp::Type,
>> std::pair<capnp::Type const, capnp::JsonCodec::HandlerBase*>,
>> std::allocator<std::pair<capnp::Type const,
>> capnp::JsonCodec::HandlerBase*> >, std::__detail::_Select1st,
>> std::equal_to<capnp::Type>, capnp::(anonymous namespace)::TypeHash,
>> std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash,
>> std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<true,
>> false, true> >::find(capnp::Type const&) const ()
>> #4  0x0000000001e483a3 in std::unordered_map<capnp::Type,
>> capnp::JsonCodec::HandlerBase*, capnp::(anonymous namespace)::TypeHash,
>> std::equal_to<capnp::Type>, std::allocator<std::pair<capnp::Type const,
>> capnp::JsonCodec::HandlerBase*> > >::find(capnp::Type const&) const ()
>> #5  0x0000000001e443d5 in 
>> capnp::JsonCodec::encode(capnp::DynamicValue::Reader,
>> capnp::Type, capnp::JsonValue::Builder) const ()
>> #6  0x0000000001e44a6f in 
>> capnp::JsonCodec::encode(capnp::DynamicValue::Reader,
>> capnp::Type, capnp::JsonValue::Builder) const ()
>> #7  0x0000000001e45a36 in 
>> capnp::JsonCodec::encodeField(capnp::StructSchema::Field,
>> capnp::DynamicValue::Reader, capnp::JsonValue::Builder) const ()
>> #8  0x0000000001e45377 in 
>> capnp::JsonCodec::encode(capnp::DynamicValue::Reader,
>> capnp::Type, capnp::JsonValue::Builder) const ()
>> #9  0x0000000001e45a36 in 
>> capnp::JsonCodec::encodeField(capnp::StructSchema::Field,
>> capnp::DynamicValue::Reader, capnp::JsonValue::Builder) const ()
>> #10 0x0000000001e45377 in 
>> capnp::JsonCodec::encode(capnp::DynamicValue::Reader,
>> capnp::Type, capnp::JsonValue::Builder) const ()
>> #11 0x0000000001e45a36 in 
>> capnp::JsonCodec::encodeField(capnp::StructSchema::Field,
>> capnp::DynamicValue::Reader, capnp::JsonValue::Builder) const ()
>> #12 0x0000000001e45377 in 
>> capnp::JsonCodec::encode(capnp::DynamicValue::Reader,
>> capnp::Type, capnp::JsonValue::Builder) const ()
>> #13 0x0000000001e45a36 in 
>> capnp::JsonCodec::encodeField(capnp::StructSchema::Field,
>> capnp::DynamicValue::Reader, capnp::JsonValue::Builder) const ()
>> #14 0x0000000001e45618 in 
>> capnp::JsonCodec::encode(capnp::DynamicValue::Reader,
>> capnp::Type, capnp::JsonValue::Builder) const ()
>> #15 0x0000000001e45a36 in 
>> capnp::JsonCodec::encodeField(capnp::StructSchema::Field,
>> capnp::DynamicValue::Reader, capnp::JsonValue::Builder) const ()
>> #16 0x0000000001e45618 in 
>> capnp::JsonCodec::encode(capnp::DynamicValue::Reader,
>> capnp::Type, capnp::JsonValue::Builder) const ()
>> #17 0x0000000001e43fcc in 
>> capnp::JsonCodec::encode(capnp::DynamicValue::Reader,
>> capnp::Type) const ()
>> #18 0x00000000009e02c7 in capnp::JsonCodec::encode<Message::Builder
>> const&> (this=0x7ffff22e1210, value=...) at /home/marc/.../capnp/compat/js
>> on.h:216
>> ```
>>
>> That's about all that I can get, even though capnproto is compiled with
>> DEBUG.
>>
>> The message trying to be encoded (sorry, I am not sure I can share the
>> entire set of schemas), is a series of simple objects, which in the
>> inner-most object contains a list that is initialized normally:
>>
>> 115         s.initIfaceType(1);
>>
>> The funny part; not initializing it, doesn't make JsonCodec crash. But
>> initializing it, or initializing it + setting a value (valid one), produces
>> the crash always.
>>
>> Valgrind etc... doesn't complain until that point.
>>
>> I am trying to isolate the problem, to make it reproducible, but I am not
>> able yet.
>>
>> Any ideas on this?
>>
>> Thanks
>>
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