Re: kern/42455: tstile hang with nfs

["Christoph Egger" <Christoph_Egger%gmx.de@localhost>]

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

From: "Christoph Egger" <Christoph_Egger%gmx.de@localhost>
To: gnats-bugs%NetBSD.org@localhost, netbsd-bugs%netbsd.org@localhost, 
gnats-admin%netbsd.org@localhost,
 kern-bug-people%netbsd.org@localhost
Cc: 
Subject: Re: kern/42455: tstile hang with nfs
Date: Tue, 04 May 2010 09:00:08 +0200

 > 
 >  I reproduced it again:
 >  
 >  db> ps /w
 >  PID   LID          COMMAND     EMUL  PRI WAIT-MSG    WAIT-CHANNEL
 >  619   732          qemu-dm   netbsd   43              0
 >  619     2          qemu-dm   netbsd   43 netio        ffffa00001310a88
 >  619     1          qemu-dm   netbsd   34 genput       ffffa00000415d40
 >  
 >  db> show lock 0xffffa00001310a88
 >  lock address : 0xffffa00001310a88 type     :               spin
 >  initialized  : 0xffffffff806449e3 interlock: 0xffffa000260da780
 >  
 >  'initialized' points to sys/kern/uipc_socket2.c:326
 >  
 >  db> show lock 0xffffa000260da780
 >  lock address : 0xffffa000260da780 type     :     sleep/adaptive
 >  initialized  : 0xffffffff80405e28
 >  shared holds :                  0 exclusive:                  0
 >  shares wanted:                  0 exclusive:                  0
 >  current cpu  :                  0 last held:                  0
 >  current lwp  : 0xffffa0002320ec00 last held: 000000000000000000
 >  last locked  : 0xffffffff8064238e unlocked : 0xffffffff803ef060
 >  owner field  : 000000000000000000 wait/spin:                0/0
 >  
 >  Turnstile chain at 0xffffffff80c385c0.
 >  => No active turnstile for this lock.
 >  
 >  'initialized' points to sys/kern/kern_mutex_obj.c:92 ,
 >  'last locked' points to sys/sys/socketvar.h:475
 >  and 'unlocked' points to sys/kern/kern_condvar.c:154
 >  
 
 some more information:
 
 db> ps /l
 PID    LID S CPU     FLAGS       STRUCT LWP *               NAME WAIT
 619    732 5   0         0   ffffa0002666d800            qemu-dm
 619      2 3   0        80   ffffa00026c24800            qemu-dm netio
 619      1 3   0         0   ffffa00026ba6c00            qemu-dm genput
 
 
 db> tr /a ffffa00026c24800
 trace: pid 619 lid 2 at 0xffffa00026c4e9f0
 sleepq_block() at netbsd:sleepq_block+0xbf
 cv_timedwait_sig() at netbsd:cv_timedwait_sig+0x10c
 sbwait() at netbsd:sbwait+0x73
 soreceive() at netbsd:soreceive+0xb0d
 dofileread() at netbsd:dofileread+0x6f
 sys_read() at netbsd:sys_read+0x73
 syscall() at netbsd:syscall+0xa8