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<center>
<h3>The Current TODO list</h3>
</center>
Since about Feb 2001, I've been maintaining a TODO list and posting it to the
devel list ocassionally.
<table width="100%" bgcolor="#e0e0e0">
<tr>
<td>
<b>
<font color="black"> Not done </font>
</b>
</td>
</tr>
</table>
<br>
<b>Packaging</b>
<br>
<blockquote>
<p>
Figure out how to ship the UML test suite
</blockquote>
<br>
<b>Functionality</b>
<br>
<blockquote>
<p>
Add a mechanism for rereading module symbols when the module is reloaded.
<p>
Extract Patrick Schaaf's cool new block driver from him.
</blockquote>
<br>
<b>Bugs</b>
<br>
<blockquote>
<p>
My attempts to run the Debian install procedure hung UML while it was
probing disks. I never figured out what was happening.
<p>
I need to figure out why some people
see 'Unexpectedly got signal 4 in signals'. This has been reported a
couple of times, but I've never got any information that would help me
debug it.
<p>
Make UML build without warnings
<p>
Make sure that each clock tick gets counted
<p>
Figure out the hostfs crash that Larent Bonnaud is seeing
<p>
make 'gdb=pty' work
<p>
protect kernel memory from userspace
<p>
Figure out why the io_thread loses its parent and its connection to the kernel
<p>
Disable SIGIO on file descriptors which are already being handled.
This will cut off some interrupt recursion.
<p>
Figure out why gdb can't use fd chan (blinky@gmx.net)
<p>
Figure out why repeated 'tail /dev/zero' with swap causes process segfaults
<p>
The ptrace proxy should handle wait correctly for non-UML subprocesses of gdb
<p>
Set SA_RESTART on SIGPROF
<p>
Figure out why hostfs panics when it's on an nfs directory on the host
(David Coulson)
<p>
Figure out why the Debian ping is slower than the Slackware ping
<p>
Replace dentry_name with d_name
<p>
Dynamically allocate all driver descriptors
<p>
Make slip_tramp conditional in slip_close
<p>
Version the mconsole and uml_router interfaces
<p>
Implement thread_saved_pc
<p>
many du / causes slab cache corruption
<p>
ddd doesn't work with gdb-pid
<p>
Removing a block device with the mconsole doesn't remove its entry in
/proc/partitions
<p>
Adding an eth device via the mconsole (and probably the command line)
won't necessarily configure the device that was named
<p>
Figure out why running a properly built UML under UML doesn't work
<p>
Figure out why init/version.c, init/main.c, and arch/um/main.c don't
get coverage data.
<p>
Figure out why leaning on the space bar when top is running causes an FPE.
<p>
'i reg' to gdb inside UML doesn't print the fp registers
<p>
Get the fp registers in core files correctly.
<p>
Fix the ubd rounding bug spotted by Steve Schmidtke and Roman Zippel.
<p>
Byte-swap the ubd bitmap (Roman Zippel)
<p>
gdb should be the last thing to be shut down so that breakpoints can
be set late in the shutdown process.
<p>
The register state in the sigcontext passed in to a signal handler should
be copied into the process registers when the handler returns.
<p>
Have the __uml_exitcall handlers check to see if they need to do anything.
<p>
Using strace as an external debugger doesn't work. strace sees no system
calls starting at the delay calibration.
</blockquote>
<br>
<b>Confirm fix</b>
<br>
<blockquote>
<p>
Get either Myrtal Meep or Matt Clay
to confirm (or not) that they can no longer crash UML with
Apache/Perl/MySQL. This will probably be fixed with the new network drivers.
<p>
Someone needs to try booting UML as a diskless client via bootp and
make sure that it works.
<p>
I have a bug that says that diskless booting doesn't work because it's
impossible to assign an address to a network interface from the
command line. However, I've heard of someone booting diskless
successfully, so this needs to be cleared up.
<p>
I have an old bug that claims that UML can be crashed with a ping
flood. I haven't seen this happen recently, so if anyone else has,
you'd better let me know.
</blockquote>
<table width="100%" bgcolor="#e0e0e0">
<tr>
<td>
<b>
<font color="black"> Done </font>
</b>
</td>
</tr>
</table>
<br>
<b>Packaging</b>
<br>
<blockquote>
<p>
Put together a UML deb builder
<p>
Figure out how to make a module tar
file with the right structure
<p>
It currently sucks. What I want is an RPM and a deb for each release
containing:
<ul>
<li>the kernel</li>
<li>HOWTO</li>
<li>user-mode network tools</li>
<li>test harness</li>
<li>test suite</li>
<li>maybe a small root filesystem like the tomsrtbt</li>
<li>modules</li>
<li>mkrootfs</li>
</ul>
Anything else? I also need suggestions for locations for all these things.
</blockquote>
<br>
<b>Functionality</b>
<br>
<blockquote>
<p>
Integrate Greg Lonnon's I/O space emulation
<p>
Make the socket channel work
<p>
Figure out what to do
about the network driver. There are duelling drivers from Jim Leu and
Lennert Buytenhek, and I need to figure out how to merge the best bits from
them into a single driver, or split them into two very distinct drivers.
<p>
Remove the tty mode save/restore from main and put it in the file descriptor
channel code. (Boria Feigin)
<p>
Added more stuff to
/proc/cpuinfo (mistral)
<p>
Allow gdb to be attached to a
host device in the same way that consoles and serial lines can
<p>
modify_ldt implemented
(patch from Lennert Buytenhek)
<p>
Add support for root hostfs
<p>
Added --help (patch from
Yves Rougy)
</blockquote>
<br>
<b>Bugs</b>
<br>
<blockquote>
<p>
I occasionally see one of the loggers
dying from a SIGTERM during boot because of a kill that's somehow directed
at the wrong process.
<p>
Implement copy_{from,to}_user using
setjmp/longjmp.
<p>
Fix gcov and gprof support
<p>
Figure out why the umn device won't serve more than one packet to remote machines.
<p>
Figure out how to make
-D_FILE_OFFSET_BITS=64 work with modules (fix from Lennert which explicitly
uses the *64 interfaces)
<p>
Figure out why ^S and ^Q don't work on the console (patch from Livio)
<p>
Stop the hangs caused by someone disconnecting from a virtual console
<p>
umn needs to destroy the slip device
when it's no longer needed (JS)
<p>
clean up the umn_set_addr logic
<p>
Make sure that readonly hostfs really
is readonly (James McMechan)
<p>
Figure out the wait_for_page hangs
<p>
I used to see syslog ocassionally hang,
but haven't in a long time. It happened again, and it turns out I was
enabling signals when they shouldn't be, allowing the timer to interrupt a
sensitive part of do_IRQ.
<p>
gdb doesn't find the kernel if it isn't
called 'linux' (Brian J. Murrell)
<p>
Have the ubd driver figure out the
block device size with BLKGETSIZE if necessary (Lennert Buytenhek, marc)
<p>
Make sure it boots in the presence of IO
redirection and piping (JS)
<p>
Rebooting a UML under debug won't kill the
old gdb
<p>
Remove assumption that argv is
contiguous (Boria Feigin)
<p>
Have hostfs copy user data with
copy_{to,from}_user.
<p>
Put in Lennert's utsname patch
(Lennert Buytenhek)
<p>
Put in Lennert's ubd LFS patch
(Lennert Buytenhek)
<p>
The kernel shouldn't hang when debug is
requested and it wasn't compiled with CONFIG_PT_PROXY.
<p>
Make empty_zero_page and empty_bad_page
reserved (Rik)
<p>
Increase COMMAND_LINE_SIZE to something
bigger (JS)
<p>
Put breakpoints on panic and stop
<p>
Make hostfs figure out external filenames
by walking up the dentry->parent tree rather than having inodes store them.
<p>
Figure out why hostfs misses files in large
directories
<p>
Make sure init can exec (Al Viro)
<p>
Fix the problems that mistral is
seeing. This is three bugs - the sleep hang, a bug in
sigio_handler (both fixed), plus the sigreturn bug.
<p>
Reimplement process signal delivery to
eliminate the race when the process handler returns
<p>
Various fixes and cleanups in hostfs (Al Viro)
<p>
Remove real_mm from thread and replace
it with some unused pte bits
<p>
Fix /proc/cmdline
(prose from Henrik Nordstrom, code from Greg Lonnon)
<p>
drivers Makefile cleanup
(patch from Greg Lonnon)
<p>
tty_flip_buffer_push fixlet patch
from (Gordon McNutt)
<p>
The ubd device should reset openflags
between mounts (jfreak)
<p>
Figure out the sleep hang. It
happens rarely. Somehow, irq_desc[0].flags gets stuck at 5 which tells do_IRQ
that the interrupt is already being handled.
<p>
Stop ^C in gdb from segfaulting processes if it hits in userspace.
<p>
Figure out why swapping causes
process segfaults and nasty mm messages.
<p>
Fix the build so that modules_install
drops modules in the proper hierarchy (fix from Henrik Nordstrom)
<p>
Got rid of hostfs_llseek (patch from
stewart and Henrik Nordstrom)
<p>
gdb now ignores SIGWINCH. (patch
from James Stevenson)
<p>
Fixed ubd stats (patch from James
Stevenson)
<p>
UML should run on kernels with
a 2G/2G address space split (blinky) <p>
Fix the segv bug where
a --x page is never fixed because thread.starting_exec is set (mistral) -
mistral hasn't complained about this in ages
<p>
Fix 'cat /proc/kmsg' (Torsten Fink)
<p>
Fix crash if someone types at
the console too soon (patch from mistral)
<p>
Change __SMP__ to CONFIG_SMP
(Niels Kristian Bech Jensen)
<p>
Include config.h where necessary
(Niels Kristian Bech Jensen)
<p>
Fix a couple allocation buglets
in hostfs (Henrik Nordstrom)
<p>
Implement internal system calls
correctly (Roman Zippel)
<p>
Allow the time to be changed
(Frank Klingenhoefer) (patch from Livio Soares)
<p>
Figure out why UML flunks the f00f test
<p>
Make the build work when CONFIG_MCONSOLE is
off
<p>
Provide some kind of reasonable error
message when the root filesystem isn't writable.
<p>
Remove the chdir from the umid setup
<p>
Figure out why the .deb build fails
checksumming - it was because hostfs reads went through the page cache
and writes bypassed it
<p>
Figure out why diffing identical kernel
pools produces diffs - can't reproduce this, so I have to assume that it's
fixed somehow
<p>
Make sure that gdbs get killed properly
<p>
Stop dev_ip_addr from crashing if the
interface has no IP addresses
<p>
set_umid should only set the umid
<p>
COW headers should have absolute pathnames
in them or backing file path names should be possibly relative to the COW
file's directory
<p>
Figure out why some early breakpoints don't
work. I.e. Setting a bp in do_initcalls or bdflush and continuing from
start_kernel misses the bp, but continuing from rest_init hits it.
<p>
Print out a decent error message when mcast setup fails because there
are no multicast devices on the host
<p>
Suppress the error message from uml_net when route fails because
there's no eth0 on the host
<p>
See if it's possible to have uml_net know
when an eth device changes its IP address
<p>
Figure out why apt-get install ntp crashes UML.
<p>
Fix the error messages when a backing file doesn't exist, and also when the
COW file exists, but is empty.
<p>
Put -fno-common back
<p>
Fix gdb
<p>
Fix daemonized operation
<p>
Run sysrq stuff in interrupt context
<p>
Make it possible to ^Z and bg UML
<p>
Make core dumping work
<p>
many du / causes process segfaults
<p>
Removing ethertap or TUN/TAP eth devices produces odd error messages in
UML
<p>
Figure out why running UML under an identical UML hangs the outer one
<p>
gdbs aren't getting killed properly again
<p>
Setting up a tuntap interface with no gate address will hang UML when
the interface is brought up
<p>
Figure why processes segfault under extreme load, like a 'make -j'
kernel build
<p>
Figure out how to let arches ifdef out PTRACE_[SG]ETREGS
<p>
Put UML temporary files (except maybe the mmap files) in the user's
home directory.
<p>
Fix the bogomips calculation.
<p>
Figure out how to implement thread private pages.
<p>
Figure out why ^S and ^Q don't work on the console (phillips)
<p>
When a non-root ubd device is COWed, the bitmap isn't mapped in for some
reason.
<p>
The mconsole driver should support C-A-D if it doesn't already.
<p>
Improve the formatting when a error message is returned from uml_net,
i.e. when TUN/TAP is requested, but uml_net doesn't support TUN/TAP.
<p>
gdb should be able to see ^C immediately
<p>
When UML halts, any external debugger needs to be told that it exited so
it doesn't get confused about the child suddenly disappearing.
<p>
setup_stack should use copy_to_user.
</blockquote>
<br>
<b>Confirm fix</b>
<br>
<blockquote>
<p>
Larent Bonnaud claimed a while ago that upgrading a Debian filesystem
hung the kernel. I need to know if this is still a problem.
<p>
Get Rik van Riel to confirm that UML no longer loses
characters that he types at the console. Rik says he hasn't seen it
in a while, mistral confirms.
</blockquote>
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