URL:
<http://savannah.gnu.org/bugs/?19439>
Summary: ``Kernel page fault at address 0x1d'' in
`setup_rw_floppy', `linux/dev/drivers/block/floppy.c:1447'
Project: The GNU Hurd
Submitted by: tschwinge
Submitted on: Wednesday 03/28/07 at 14:51
Category: GNU Mach
Severity: 3 - Normal
Priority: None
Item Group: None
Status: None
Privacy: Public
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Reproducibility: Once
Size (loc): None
Planned Release: None
Effort: 0.00
Wiki-like text discussion box:
_______________________________________________________
Details:
I was running a Hurd system with an up-to-date GNU Mach kernel in QEMU and
was issueing a ``settrans -ca /tmp/f ./ext2fs-pre_ogi.static /dev/fd0'' when
I was presented with a system crash and the kernel debugger displaying a
``Kernel page fault at address 0x1d''. Analyzing the eip showed that it
happened in `setup_rw_floppy', `linux/dev/drivers/block/floppy.c:1447'.
`ext2fs-pre_ogi.static' is -- as the name suggests -- a statically compiled
pre-Ogi-patched `ext2fs' (that allows block sizes different from 4k), has
worked before just fine and can be gotten from
<http://nic-nac-project.de/~schwinge/tmp/ext2fs-pre_ogi.static.bz2>.
`/dev/fd0' is a QEMU-emulated floppy disk device, operating on a GRUB disk
image. When I earlier used `dd' to copy the whole device's content into a
file, that worked just fine.
#v+
(gdb) x/3i 0x16a6b5
0x16a6b5 <setup_rw_floppy+437>: movzbl 0x1d(%edx),%eax
0x16a6b9 <setup_rw_floppy+441>: cmp %ebx,%eax
0x16a6bb <setup_rw_floppy+443>: jg 0x16a6a0 <setup_rw_floppy+416>
#v-
That's also what the kernel debugger showed me.
Examining the registers I see that %edx in fact is zero.
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