iSCSI initiator: iscontrol cannot be stopped or killed

[Mark Martinec]

Initially reported to freebsd-current, but was suggested
to repost here:

Problem: the iscontrol process starts normally and establishes
a session and brings up a device, but it cannot be stopped.
It does not react to a HUP signal, and neither to KILL.

The /dev/da0 device is operational and the remote disk remains
normally accessible, regardless of how I try to (unsuccessfully)
shutdown the iscontrol process. The ps reports the state of the
process as "Ds", mwchan "ffp", not doing anything. A ktrace does
not show any reaction to a received signal. A machine restart
seems to be necessary to break the iSCSI session.

Using FreeBSD 9.0-rc2, amd64, also tried with 9.0-PRERELEASE.
This used to work normally as documented on the same host with
the same iscsi.conf config file before upgrading from 8.2 to 9.0.

Anybody else experiencing this problem? Suggestions welcome.


Freshly installed from a FreeBSD 9.0-RC2 amd64 ISO image:

# uname -a
FreeBSD neli-virtual 9.0-RC2 FreeBSD 9.0-RC2 #0: Sat Nov 12 18:35:25 UTC 2011
  root at farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64

# ps axl | grep isc
    0   986     0   0 -16  0      0     16 isc_pr DL    ??   0:00.24 [isc_out 0]
    0   987     0   0 -16  0      0     16 sbwait SL    ??   0:00.24 [isc_in 0]
    0   988     1   0  20  0  16420   1644 ffp    Ds    ??   0:00.09 iscontrol -v -c /etc/iscsi.conf -n xxx

# procstat -k -k 988
  PID    TID COMM             TDNAME           KSTACK                       
  988 100071 iscontrol        -                mi_switch+0x174
    sleepq_timedwait+0x42 _sleep+0x301 ic_init+0x2f1 iscsi_ioctl+0x525
    devfs_ioctl_f+0x7b kern_ioctl+0x115 sys_ioctl+0xfd amd64_syscall+0x450
    Xfast_syscall+0xf7

# cat /etc/iscsi.conf
xxx {
  AuthMethod    = CHAP
  ChapIName     = markxxx
  ChapSecret    = xxxxx
  InitiatorName = iqn.2011-05.si.ijs.neli:storage.disk1
  TargetName    = iqn.1986-03.com.sun:02:f5db11a2-14d7-ceaf-ab13-8bdb51619dda
  TargetAddress = xxx.xxx.xxx.xxx:3260,1
}

# sysctl net.iscsi_initiator
net.iscsi_initiator.driver_version: 2.2.4.2
net.iscsi_initiator.isid: DIB00
net.iscsi_initiator.sessions: 1
net.iscsi_initiator.0.targetname:
  iqn.1986-03.com.sun:02:f5db11a2-14d7-ceaf-ab13-8bdb51619dda
net.iscsi_initiator.0.targeaddress: xxx.xxx.xxx.xxx
net.iscsi_initiator.0.stats:
  recv=7295 sent=7281 flags=0x0000059f pdus-alloc=0 pdus-max=7
  cws=1024 cmd=1c03 exp=1c03 max=2002 stat=1c08 itt=1c03
net.iscsi_initiator.0.douio: 0


  Mark