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kern/55680: llentry_free panic

>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)
System: NetBSD 9.0_STABLE NetBSD 9.0_STABLE (GENERIC) #0: Sun Sep 20 10:17:44 UTC 2020 amd64
Architecture: x86_64
Machine: amd64
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 ---
cpu1: End traceback...
Reboot a router?

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