[DragonFlyBSD - Bug #3320] vtnet: Panic when setting MTU to 16384

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #3320 has been updated by daftaupe.


I did mention the commit in golang's github issue too.

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Bug #3320: vtnet: Panic when setting MTU to 16384
http://bugs.dragonflybsd.org/issues/3320#change-14449

* Author: tuxillo
* Status: Resolved
* Priority: High
* Assignee: tuxillo
* Category: Driver
* Target version: 6.4
* Start date: 2022-07-30
----------------------------------------
As reported "here":https://github.com/golang/go/issues/23060#issuecomment-1191718492 , a kernel panic is triggered when trying to set MTU to 16384 for vtnet:

<pre>
root at buildlet:~ # ifconfig vtnet0 mtu 16384
panic: overflowed mbuf 0xfffff8037c5bec00
cpuid = 8
Trace beginning at frame 0xfffff8037cf9c6e8
m_free() at m_free+0x351 0xffffffff806be5c1 
m_free() at m_free+0x351 0xffffffff806be5c1 
m_freem() at m_freem+0x15 0xffffffff806be845 
vtnet_newbuf() at vtnet_newbuf+0x4b 0xffffffff80a71e9b 
vtnet_init() at vtnet_init+0x108 0xffffffff80a73848 
vtnet_ioctl() at vtnet_ioctl+0x213 0xffffffff80a73d23 
Debugger("panic")

CPU8 stopping CPUs: 0x0000feff
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbcc819(%rip)
db> 
db>
</pre>





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