[haiku-bugs] Re: [Haiku] #5949: KDL: Could not read block 18110: bytesRead: -1, error: Operation timed out

From: "mmlr" <trac@xxxxxxxxxxxx>
Date: Sat, 13 Apr 2013 15:29:50 -0000
#5949: KDL: Could not read block 18110: bytesRead: -1, error: Operation timed 
out
-----------------------------+----------------------------
   Reporter:  stippi         |      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 mmlr):

 The updated log actually does bring news. The error that is printed is the
 status code returned from the USB stack. This is "No error" and means that
 from the USB stack side of things worked out well, i.e. the transfer did
 not fail per se. The other condition to trigger the error code path is
 that the reported transfer length does not match the scheduled/expected
 transfer length. This can be a problem on many levels. The actual length
 is the sum of all the lengths of each indivial packet sent/received by the
 USB bus driver, so it is possible that there is a bug causing this to be
 miscalculated, or USB packets might indeed not be scheduled properly at
 all.

 It is also possible that this is a defect in VirtualBox. It is common for
 emulated hardware to sometimes take shortcuts and not fully emulate a
 certain device which might lead to problems with "by the book" drivers
 like our EHCI one. It might also just be a bug that is only triggered by
 the pattern in which our EHCI driver does things that hasn't been
 uncovered yet due to other systems working differently. Since I have seen
 this particular combination of errors only reported with VirtualBox I tend
 in that direction.

 Generally the issues reported here are two different ones. The timeout is
 usually really just that, a timeout. It is usually caused by transfers
 being so large that they simply have to exceed the relatively short
 timeout. The timeout is static and doesn't take bus speed or bandwidth
 constraints into account. Hence you are almost guaranteed to run into it
 when transferring large files with USB 1.1 as it simply is too slow to
 ever make it within that timeout. It is also possible that if the bus is
 busy due to other devices, the transfer doesn't complete quickly enough.

 The issue of "sending or receiving of the data failed" as explained above,
 is different from the timeout. I would suggest opening a new ticket for
 that issue. Please attach the VirtualBox log files to that new ticket,
 they might indicate what's going on from the VirtualBox side. For example
 the EHCI driver might try something VirtualBox doesn't expect or it might
 do something plain buggy that hardware EHCI implementations just handle
 silently.

--
Ticket URL: <http://dev.haiku-os.org/ticket/5949#comment:7>
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[haiku-bugs] Re: [Haiku] #5949: KDL: Could not read block 18110: bytesRead: -1, error: Operation timed out

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