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kern/53656: rump shmif triggers assertions

>Number:         53656
>Category:       kern
>Synopsis:       rump shmif triggers assertions
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Oct 07 09:00:00 +0000 2018
>Originator:     Martin Husemann
>Release:        NetBSD 8.99.25
The NetBSD Foundation, Inc.
System: NetBSD 8.99.25 NetBSD 8.99.25 (MODULAR) #119: Sat Oct 6 21:44:09 CEST 2018 sparc64
Architecture: sparc64
Machine: sparc64

I see spurious failures in the  fs/vfs/t_full/nfs_fillfs test case:

Termination reason

FAILED: child died
Standard output stream

rpcbind debugging enabled.
[   2.0800090] panic: kernel diagnostic assertion "sp.sp_len <= ETHERMTU + ETHER_HDR_LEN" failed: file "/usr/src/sys/rump/net/lib/libshmif/if_shmem.c", line 733 
[   2.0800090] rump kernel halting...
[   1.0900090] inaccurate wcc data (mtime) detected, disabling wcc (ctime 1538848666.919902788 1538848666.919902788, mtime 1538848666.919902788 1538848666.919902788)

Standard error stream

Getting export list.
Got line 
Got line /myexport -noresvport -noresvmnt -maproot=0:0
Making new ep fs=0xc500,0x78b
doing opt -noresvport -noresvmnt -maproot=0:0
doing opt -noresvmnt -maproot=0:0
doing opt -maproot=0:0
got host
Got line /myexport -ro -noresvport -noresvmnt -maproot=0:0
Found ep fs=0xc500,0x78b
doing opt -ro -noresvport -noresvmnt -maproot=0:0
doing opt -noresvport -noresvmnt -maproot=0:0
doing opt -noresvmnt -maproot=0:0
doing opt -maproot=0:0
got host
Getting mount list.
Here we go.
can't register with udp6 portmap
can't register with tcp6 portmap
got mount request from
-> rpcpath: /myexport
-> dirpath: /myexport
Mount successful.


Not exactly repeatable, but try a while:
cd /usr/tests/fs/vfs && atf-run t_full


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