[DragonFlyBSD - Bug #3170] (New) repeatable nfsd crash

bugtracker-admin at leaf.dragonflybsd.org bugtracker-admin at leaf.dragonflybsd.org
Sat Jan 26 13:39:53 PST 2019

Issue #3170 has been reported by tse.

Bug #3170: repeatable nfsd crash

* Author: tse
* Status: New
* Priority: Normal
* Assignee: 
* Category: 
* Target version: Latest stable
I created a linux vm on qemu with nfs shared from Dragonfly. Reason being so I could install the go-app-engine for google cloud. Could read/write small files to the nfs share. But running google-cloud-sdk/install.sh from the vm on the nfs share quickly causes this error:

panic: assertion "m->m_type == MT_DATA" failed in m_dup_data at /usr/src/sys/kern/uipc_mbuf.c:1820
cpuid = 1
Trace beginning at frame 0xfffff802f71bf500
m_dup_data() at m_dup_data+0x12b 0xffffffff805e8a7b 
m_dup_data() at m_dup_data+0x12b 0xffffffff805e8a7b 
nfs_realign.isra.3() at nfs_realign.isra.3+0x48 0xffffffff807177c8 
nfsrv_rcv() at nfsrv_rcv+0x490 0xffffffff8071c110 
sys_nfssvc() at sys_nfssvc+0x13e7 0xffffffff8071fcf7 
syscall2() at syscall2+0x238 0xffffffff8098c0d8

I've switched from nfsd to unfsd, and that works fine. Though it took me a day of fiddling for unfsd, just because I didn't know not to run it with mountd. Hehe, such is life :)

Sorry, I'm sure it would take me many multiple months of work to think of supplying a patch for this bug

But I'm happy. It's my first time to setup an nfs share and linux vm, and now I can use them to access things from Dragonfly like google app engine, or clang sanitizers to hold my hand when I'm writing c

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