[Jack-Devel] JackD Issues "Checksize errors"

Dwar Members

i suppose this is not the "right" place to talk about my issue, but as 
it seems to be a "rather new one",
i'd like to place it here.


i am using JackD 1.9.10 in combination with Ardour 3.5.357 and two 
Hoontech DSP2000/DC-DAC2000 cards (ICE1712 Chipset) merged with a custom 
.asoundrc, on Ubuntu Studio 12.04 with Kernel 3.14.04. After running 
Ardour / JackD for a couple of minutes JackD throws a large amount of 
the following errors  (until it shuts down by itself, usually somewhere 
between one hour or so). The audio functionality itself is ok.

    |Unknown request 0
    CheckSize error size = -1 Size() = 4
    CheckRead error
    CheckSize error size = 0 Size() = 12
    CheckRead error
    CheckSize error size = 32 Size() = 12
    CheckRead error
    CheckSize error size = -1 Size() = 4
    CheckRead error
    CheckSize error size = 0 Size() = 12
    CheckRead error
    CheckSize error size = 32 Size() = 12
    CheckRead error
    CheckSize error size = -1 Size() = 4
    CheckRead error
    CheckSize error size = 0 Size() = 12
    CheckRead error
    CheckSize error size = 32 Size() = 12
    CheckRead error
    CheckSize error size = -1 Size() = 4
    CheckRead error
    CheckSize error size = 0 Size() = 12
    CheckRead error
    CheckSize error size = 32 Size() = 12
    CheckRead error
    CheckSize error size = -1 Size() = 4
    CheckRead error
    CheckSize error size = 0 Size() = 12
    CheckRead error
    CheckSize error size = 32 Size() = 12
    CheckRead error
    CheckSize error size = -1 Size() = 4
    CheckRead error
    CheckSize error size = 0 Size() = 12
    CheckRead error
    CheckSize error size = -1 Size() = 4
    CheckRead error
    CheckSize error size = 0 Size() = 12
    CheckRead error
    CheckSize error size = 32 Size() = 12
    CheckRead error
    CheckSize error size = -1 Size() = 4
    CheckRead error
    CheckSize error size = 0 Size() = 12
    CheckRead error
    CheckSize error size = 32 Size() = 12
    CheckRead error
    CheckSize error size = -1 Size() = 4
    CheckRead error
    CheckSize error size = 0 Size() = 12
    CheckRead error
    Unknown request -1
    jackd: ../common/JackGraphManager.cpp:44: void
    Jack::JackGraphManager::AssertPort(jack_port_id_t): Assertion
    `port_index < fPortMax' failed.
    |



Choosing different sampling rates between 44.1K up to 96K makes no 
difference, even not increasing/decrease periods/buffer size on JackD, 
or sync one card to the other one via SP/DIF (which i usually do). I had 
this issue on different hardware platforms (on an "old" Phenom 9850 
Quad-Core and actually on a Intel Q6600 Quad-Core running at Standard 
frequency, not overclocked). Playing around with the CPU governor has 
also no effect.

I cannot figure out the cause of this error, no matter what i try :(


Kind regards
Stef

1410541855.22444_0.ltw:2, <54132914.3010703 at rinass dot de>