proxy-arp & mpd
oleksandr at samoylyk.sumy.ua
Wed Jul 23 15:20:57 UTC 2008
Damien Deville wrote:
> we are facing a similar issue with arp blocked in sbwait state.
> Here is a way to reproduce it:
> - add a bunch of arp entries in your arp table (best is around 255
> - launch two arp -a -d in parallel ('arp -a -d & arp -a -d &')
> Both processes will be in concurence to access the table. One process
> will successfully nuke all entries of the arp table, the other one will
> be blocked in rtmsg function on the read while executing a RTM_GET or
> RTM_DELETE command after some time. By instrumenting arp we noticed that
> it happened when both process access to the same entry.
> Here is a backtrace of the blocked arp on FreeBSD 7.0
> (gdb) bt
> #0 0x28158f81 in read () from /lib/libc.so.7
> #1 0x08049091 in rtmsg ()
> #2 0x08049b44 in delete ()
> #3 0x0804a1fd in nuke_entry ()
> #4 0x08049a77 in search ()
> #5 0x08049e75 in main ()
> I can reproduce this on FreeBSD 4.11, 6.2 and 6.3, and FreeBSD 7.0.
Any workaround so far?
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