[haiku-bugs] Re: [Haiku] #4573: Haiku CD Fails to Boot: "PANIC: I/O operation would need to be cut."
- From: "tonestone57" <trac@xxxxxxxxxxxx>
- Date: Fri, 23 Jul 2010 15:46:20 -0000
#4573: Haiku CD Fails to Boot: "PANIC: I/O operation would need to be cut."
----------------------------+-----------------------------------------------
Reporter: tmmagee | Owner: axeld
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: System/Kernel | Version: R1/alpha1
Resolution: | Keywords:
Blocked By: | Has a Patch: 0
Platform: x86 | Blocking:
----------------------------+-----------------------------------------------
Comment (by tonestone57):
Seems this error occurs in file:
src/add-ons/kernel/generic/scsi_periph/io.cpp
{{{
150 if (numBlocks != originalNumBlocks)
151 panic("I/O operation would need to be cut.");
}}}
On older CD-ROM drives, numBlocks value is changed under this if
statement:
{{{
131 // make sure we avoid 10 byte commands if they aren't
supported
132 if (!device->rw10_enabled || device->preferred_ccb_size ==
6) {
}}}
This ticket is caused by changing numBlocks value in one of these, making
it no longer equal to originalNumBlocks and triggering the panic:
{{{
135 if (numBlocks > 0x100)
136 numBlocks = 0x100;
}}}
Or
{{{
145 if (pos < 0x100000)
146 numBlocks = min_c(numBlocks, 0x100000 -
pos);
}}}
--
Ticket URL: <http://dev.haiku-os.org/ticket/4573#comment:5>
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