override for mpd
qhwt+dragonfly-bugs at les.ath.cx
Wed Apr 7 06:19:42 PDT 2004
[switching to bugs@]
On Wed, Apr 07, 2004 at 10:39:36AM +0900, YONETANI Tomokazu wrote:
> 1. when the netgraph code tries to call a function in a module that's
> not yet loaded, it calls linker_search_path(), which then passes
> curthread to NDINIT, where KKASSERT(p != NULL) failed(p = td->td_proc).
> 2. when trying to open a pptp session with mpd, socreate() dereferences
> things via td->td_proc, but it's NULL. here's a backtrace roughly
> written down by hand:
> (sorry, I don't know how to reproduce this with ngctl yet,
> I'm still learning it). I put printf()'s in these functions and at least
> at ngc_send, curthread->td_proc was not NULL, but it's NULL in ng_add_hook.
> I know td->td_proc may be NULL, but with older kernel it doesn't panic
> in the places above. I don't know what caused this though.
After doing some binary searches, I found that backing out two changes
stopped panic situation 2 above. With these revisions backed out,
kernel from CVS tip doesn't panic when using pptp on mpd. I don't quite
understand what's wrong about this.
As for the backtrace, savecore keeps failing for dumps from older kernels.
I'm doing buildkernel from newer source with gcc2 and no CPU optimization
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