#9528: stop_watching() KDLs on page fault, monitoring a CDDA -----------------------------+---------------------------- Reporter: ttcoder | Owner: axeld Type: bug | Status: new Priority: normal | Milestone: R1 Component: System/Kernel | Version: R1/Development Resolution: | Keywords: Blocked By: | Blocking: Has a Patch: 0 | Platform: All -----------------------------+---------------------------- Comment (by ttcoder): Turns out it's not that easy to find the root cause... If I hardcode the file descriptor attrFD to -1 (so as to disable attribute reading) in `Volume::DetermineName()` here... http://cgit.haiku-os.org/haiku/tree/src/add- ons/kernel/file_systems/cdda/kernel_interface.cpp#n821 I have a rock-solid cdda driver (to note, the other change is that I've commented out all the cd-text stuff too; but contrarily to initial impressions I think the cd-text code is ''not activated at all'', apparently it only serves for rare occurences of audio CDs that have textual strings embedded inside the audio, something which I have never seen and do not have in any of my audio CDs here I don't think). If however I do ''not'' comment out the attrFD and `open_attributes()` stuff, then Haiku crashes easily... somewhere in code ''unrelated'' to the cdda driver (see grab). So my working theories are: 1. there is some kind of corruption created somewhere in the (big) remainder of the code that I didn't not comment out, e.g. class Attribute, class Volume ..etc. 2. there is some kind of corruption from the cd-text code (again, that's an impossible theory AFAIU since the cd-text code is NOT exercised even if I do not comment it out). 3. there is some kind of interaction/bug with something else than the cdda driver, be it the VM subsystem or whatnot (an unlikely theory it seems). Neither of which leads to a speedy resolution.. Anyway I guess I should be happy since I can ''at least'' use the driver somewhat reliably now, if I comment out the DetermineName() code :-] -- Ticket URL: <https://dev.haiku-os.org/ticket/9528#comment:8> Haiku <https://dev.haiku-os.org> Haiku - the operating system.