Re: kern/42455: tstile hang with nfs

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

Some information about the nfsmblk process:

db> tr /a ffffa000260cdc00
trace: pid 0 lid 47 at 0xffffa00026110980
sleepq_block() at netbsd:sleepq_block+0xbf
cv_wait() at netbsd:cv_wait+0x106
nfs_writerpc() at netbsd:nfs_writerpc+0xda1
nfs_doio() at netbsd:nfs_doio+0x4c2
nfssvc_iod() at netbsd:nfssvc_iod+0x17b

db> ps /w
PID   LID          COMMAND     EMUL  PRI WAIT-MSG    WAIT-CHANNEL
0      47           system   netbsd   96 nfsmblk      ffffa00026110a88

db> show lock ffffa00026110a88
lock address : 0xffffa00026110a88 type     :               spin
initialized  : 0xffffffff804da720 interlock: 0xffffa00026110a80

db> show lock 0xffffa00026110a80
lock address : 0xffffa00026110a80 type     :               spin
initialized  : 0xffffffff804da709
shared holds :                  0 exclusive:                  0
shares wanted:                  0 exclusive:                  0
current cpu  :                  0 last held:                  0
current lwp  : 0xffffa0002320ec00 last held: 000000000000000000
last locked  : 0xffffffff804db406 unlocked : 0xffffffff803eeae7
owner field  : 0x0000000000000600 wait/spin:                0/1

'last locked' points to sys/nfs/nfs_vnops.c:1468
'unlocked' points to sys/kern/kern_condvar.c:154