Re: kern/55680: llentry_free panic

[Kimmo Suominen <kim%netbsd.org@localhost>]

Hi!

> sysctl net.inet6.ip6.forwarding
net.inet6.ip6.forwarding = 0

And normally there are two routers learned by the kernel from RAs (not
running dhcpcd):

> ndp -r
fe80::822a:a8ff:fe4f:8c3a%vioif0 if=vioif0, flags=, pref=high, expire=21m43s
fe80::de9f:dbff:fe28:91fa%vioif0 if=vioif0, flags=, pref=medium, expire=28m49s

I've rebooted the same router (pref=high) two more times since without
a panic, so it would appear to be timing related.

Kind regards,
+ Kimmo

On Wed, 23 Sep 2020 at 05:55, Ryota Ozaki <ozaki-r%netbsd.org@localhost> wrote:
>
> The following reply was made to PR kern/55680; it has been noted by GNATS.
>
> From: Ryota Ozaki <ozaki-r%netbsd.org@localhost>
> To: Kimmo Suominen <kim%netbsd.org@localhost>
> Cc: "gnats-bugs%NetBSD.org@localhost" <gnats-bugs%netbsd.org@localhost>, kern-bug-people%netbsd.org@localhost,
>         gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost
> Subject: Re: kern/55680: llentry_free panic
> Date: Wed, 23 Sep 2020 11:52:36 +0900
>
>  On Wed, Sep 23, 2020 at 12:40 AM Kimmo Suominen <kim%netbsd.org@localhost> wrote:
>  >
>  > >Number:         55680
>  > >Category:       kern
>  > >Synopsis:       llentry_free panic
>  > >Confidential:   no
>  > >Severity:       non-critical
>  > >Priority:       medium
>  > >Responsible:    kern-bug-people
>  > >State:          open
>  > >Class:          sw-bug
>  > >Submitter-Id:   net
>  > >Arrival-Date:   Tue Sep 22 15:40:00 +0000 2020
>  > >Originator:     Kimmo Suominen
>  > >Release:        NetBSD 9.0_STABLE (202009201240Z)
>  > >Organization:
>  > >Environment:
>  > System: NetBSD chronologie.gw.fi 9.0_STABLE NetBSD 9.0_STABLE (GENERIC) #0: Sun Sep 20 10:17:44 UTC 2020 mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC amd64
>  > Architecture: x86_64
>  > Machine: amd64
>  > >Description:
>  > I rebooted the currently selected default router (high pref) and the system paniced.
>  >
>  > panic: pr_item_bitmap_put: [llentrypl] 0xffff88bff9db2330 already freed
>  > cpu1: Begin traceback...
>  > vpanic() at netbsd:vpanic+0x160
>  > snprintf() at netbsd:snprintf
>  > pool_put() at netbsd:pool_put+0x492
>  > llentry_free() at netbsd:llentry_free+0xad
>  > nd6_free() at netbsd:nd6_free+0x161
>  > nd6_llinfo_timer() at netbsd:nd6_llinfo_timer+0x388
>  > callout_softclock() at netbsd:callout_softclock+0xc6
>  > softint_dispatch() at netbsd:softint_dispatch+0xab
>  > DDB lost frame for netbsd:Xsoftintr+0x4f, trying 0xffffcc8031e9b0f0
>  > Xsoftintr() at netbsd:Xsoftintr+0x4f
>  > --- interrupt ---
>  > 0:
>  > cpu1: End traceback...
>  > >How-To-Repeat:
>  > Reboot a router?
>  > >Fix:
>  >
>
>  One question.  Is net.inet6.ip6.forwarding of your system 1 or 0?
>
>  Thanks,
>    ozaki-r
>