kern/47739: tmpfs panic: kernel diagnostic assertion "(node)->tn_spec.tn_dir.tn_readdir_lastp == NULL..."

[Thomas Klausner <wiz%NetBSD.org@localhost>]

>Number:         47739
>Category:       kern
>Synopsis:       tmpfs panic: kernel diagnostic assertion 
>"(node)->tn_spec.tn_dir.tn_readdir_lastp == NULL..."
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Apr 13 10:45:00 +0000 2013
>Originator:     Thomas Klausner
>Release:        NetBSD 6.99.19
>Organization:
Curiosity is the very basis of education and if you tell me that 
curiosity killed the cat, I say only that the cat died nobly.
- Arnold Edinborough
>Environment:
        
        
System: NetBSD yt.nih.at 6.99.19 NetBSD 6.99.19 (KVOTHE) #0: Sun Apr 7 19:52:05 
CEST 2013 
wiz%yt.nih.at@localhost:/archive/foreign/src/sys/arch/amd64/compile/obj/KVOTHE 
amd64
Architecture: x86_64
Machine: amd64
>Description:
My machine just paniced from X, so no backtrace.
savecore reported:
Checking for core dump...
savecore: kvm_read: invalid translation (invalid level 2 PDE)
savecore: reboot after panic: kernel diagnostic assertion 
"(node)->tn_spec.tn_dir.tn_readdir_lastp == NULL || 
tmpfs_dircookie((node)->tn_spec.tn_dir.tn_readdir_lastp) == 
(node)->tn_spec.tn_dir.tn_readdir_lastn" failed: file 
"/archive/foreign/src/sys/fs/tmpfs/tmpfs_subr.c", line 610
savecore: system went down at Sat Apr 13 12:15:32 2013

savecore: writing compressed core to /var/crash/netbsd.12.core.gz

>How-To-Repeat:
Run a bulk build inside tmpfs, get unlucky.
Previously happened on March 3, so it's not exactly common.
>Fix:
Not known.

>Unformatted: