Re: kern/42455: tstile hang with nfs

[yamt%mwd.biglobe.ne.jp@localhost (YAMAMOTO Takashi)]

The following reply was made to PR kern/42455; it has been noted by GNATS.

From: yamt%mwd.biglobe.ne.jp@localhost (YAMAMOTO Takashi)
To: Christoph_Egger%gmx.de@localhost
Cc: gnats-bugs%NetBSD.org@localhost, netbsd-bugs%netbsd.org@localhost, 
gnats-admin%netbsd.org@localhost,
        kern-bug-people%netbsd.org@localhost, rmind%netbsd.org@localhost, 
ad%netbsd.org@localhost,
        enami%netbsd.org@localhost
Subject: Re: kern/42455: tstile hang with nfs
Date: Tue, 26 Oct 2010 09:36:53 +0000 (UTC)

 hi,
 
 >>  >  I added some more debug lines and figured out that the macro
 >>  >  nfsm_wcc_data() drops the mbuf chain w/o decreasing
 >>  >  ctxt.nwc_mbufcount.
 >>  
 >>  The nfsm_wcc_data() macro calls the nfsm_postop_attr() macro.
 >>  The nfsm_postop_attr() macro calls nfsm_loadattrcache() function.
 >>  The nfsm_loadattrcache() function calls nfsm_disct() function.
 >>  
 >>  nfsm_disct() is the function in error which drops the mbuf chain.
 
 are you sure?
 iirc, nwc_mbufcount is about sending mbuf.  otoh, nfsm_disct is for
 received mbuf.  i guess that the ancient macros confused you.
 
 YAMAMOTO Takashi