ubt0, Bluetooth and kernel memory leaking

[Maksim Yevmenkin]

Hello Gary,
 
> It seems when using rfcomm_pppd (at least) as a Bluetooth <-> LAN
> gateway there is a fairly large memory leak which eventually crashes
> the box running the ppp server.  To track down where, I recorded the
> output of kern.malloc every minute until the box crashed.  At the
> start of the debugging run, I saw:
> 
>        devbuf   441  2650K   2861K     2504 
> 16,32,64,128,256,512,1024,2048,4096,8192,16384,65536
> 
> A mere 32 minutes later (right before it crashed), it was up a
> considerable ammount:
> 
>        devbuf 89943184451K 184451K    92399 
> 16,32,64,128,256,512,1024,2048,4096,8192,16384,65536
> 
> I'm pretty sure that kernel virtual memory got exhausted and the
> machine paniced and rebooted.

hmmm... please correct me if i wrong, but devbuf means memory allocated 
with M_DEVBUF. if that is true then ng_ubt(4) is likely not a problem as
it never allocated memory from M_DEVBUF.
 
> I'm not even sure where to start looking for this. I'm using a MSI USB
> dongle:

[...]

this all looks normal to me. i seem to recall very similar discussion. 
someone else had exactly the same problem. i think last time it was tracked
back to USB code memory leak.

> This is on -current from approx. Aug 14 2003.

i just quickly checked the CVS. according to your -current date you should
have this fix. can you double check? perhaps there is another bug somewhere.

i will take close look at ng_ubt(4) today once again.

=================================================

CVS log for src/sys/dev/usb/usb_mem.c

Revision 1.4 / (download) - annotate - [select for diffs], Tue Jul 29 05:07:37
2003 UTC (7 weeks, 4 days ago) by jmg
Branch: MAIN
CVS Tags: HEAD
Changes since 1.3: +2 -0 lines
Diff to previous 1.3 (colored)

fix another bus_dma leak due to not having a size param for our bus_dma
allocation function.  With this patch, it prevents continous growth of
the devbuf memory pool.

Tested with ssh <host> dd of=/dev/null < /dev/zero and vmstat -m | grep devbuf

======================================================

thanks,
max


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