[issue568] ACPI(?) double-free on shutdown (More K9AGM fun)

YONETANI Tomokazu qhwt+dfly at les.ath.cx
Sat Mar 10 22:16:32 PST 2007

On Sun, Mar 11, 2007 at 04:23:03AM -0000, Joe Floid Kanowitz wrote:
> Joe "Floid" Kanowitz <jkanowitz at snet.net> added the comment:
> @ Tomokazu,
> Unfortunately your patch doesn't seem to be changing the behavior.  
> http://bugs.dragonflybsd.org/file216/3-08-2007%20qwht%20patch%20panic%201.png and
> http://bugs.dragonflybsd.org/file217/3-08-2007%20qwht%20patch%20panic%202.png
> show the result with a SMP kernel built from today's sources (+ patch); UP did
> basically the same thing with some other quirks.  (I use gdm, and for some
> inexplicable reason moving the mouse causes it to freeze with the UP kernel.)

I was under the impression that just going to single-user mode and
type `reboot' could trigger the panic, no?

> @ Matt,
> Since Tomokazu's patch showed up before I could test, I still haven't tried
> yours and will do so next just to prove it.  This bug obviously sucks for anyone
> with a need to reboot remotely,

Unfortunately I can't reproduce the same panic on both UP and SMP kernels
here.  Can you try attached patch?  This is a slightly modified version of
Matt's patch but can print the function and the line number of the previous
caller of AcpiOsReleaseCache().  To build the acpi driver, revert previous
patches, then
(for SMP kernel, you also need "export CFLAGS='-O -pipe -DSMP=1'")
$ cd /sys/dev/acpica5
$ make cleandir; make cleandir
$ make -s obj && make -s depend && make -s
$ su
# make install && reboot

You don't need to try this for both UP and SMP kernels, as either of them
can trigger the panic.  Note that this patch avoids the double-free panic
so you need to use `shutdown -p' or `shutdown -h' instead of `reboot'
(unless dmesg survives across reboot).

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