# [OmniOS-discuss] itadm delete-tpg hang

Alexandre Lecuyer alexandre.lecuyer at gmail.com
Wed Oct 8 16:08:44 UTC 2014

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    I have seen this happen twice :

    "/usr/sbin/itadm delete-tpg <tpg>" hangs.

    The stack :

    [ ffffff002d2c9930 _resume_from_idle+0xf4() ]
      ffffff002d2c9960 swtch+0x141()
      ffffff002d2c99a0 cv_wait+0x70(ffffff1724512ba8, ffffff1724512ba0)
      ffffff002d2c99e0 idm_refcnt_wait_ref+0x7b(ffffff1724512b88)
      ffffff002d2c9a20 iscsit_config_destroy_tpgs+0x4d(ffffff002d2c9a90)
      ffffff002d2c9ae0 iscsit_config_merge+0xfb(ffffff486c690c70)
      ffffff002d2c9c80 iscsit_drv_ioctl+0x3d6(10800000000, 1, 8047cf8, 100403,
    ffffff295594dc48, ffffff002d2c9e68)
      ffffff002d2c9cc0 cdev_ioctl+0x39(10800000000, 1, 8047cf8, 100403,
    ffffff295594dc48, ffffff002d2c9e68)
      ffffff002d2c9d10 spec_ioctl+0x60(ffffff2847bbca00, 1, 8047cf8, 100403,
    ffffff295594dc48, ffffff002d2c9e68, 0)
      ffffff002d2c9da0 fop_ioctl+0x55(ffffff2847bbca00, 1, 8047cf8, 100403,
    ffffff295594dc48, ffffff002d2c9e68, 0)
      ffffff002d2c9ec0 ioctl+0x9b(4, 1, 8047cf8)
      ffffff002d2c9f10 sys_syscall32+0xff()

    idm_refcnt_wait wants refcount to be 0, but that doesn't happen.
    > ffffff1724512b88::print -t idm_refcnt_t
    idm_refcnt_t {
        int ir_refcnt = 0x1
    [..]

    I found only two places where ir_refcnt is decremented :
    idm_refcnt_rele
    idm_refcnt_rele_and_destroy

    They seem likely to be called from iscsit_config_merge_tpg or
    iscsit_portal_offline
    But at this point I don't really know what to look for.

    Has anyone already seen this ?

    cheers,
    alex
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