[Varnish] #534: Threads stuck in trunk

[Varnish]

#534: Threads stuck in trunk
---------------------------+------------------------------------------------
 Reporter:  anders         |        Owner:  phk  
     Type:  defect         |       Status:  new  
 Priority:  high           |    Milestone:       
Component:  varnishd       |      Version:  trunk
 Severity:  critical       |   Resolution:       
 Keywords:  threads stuck  |  
---------------------------+------------------------------------------------
Comment (by anders):

 Running varnish trunk/4080 the same issue happened. This time I set
 diag_bitmap to 0x7f to see if I could get any more info. Varnishlog shows:

 {{{
     0 Debug        -
 "MTX_LOCK(wrk_decimate_flock,cache_pool.c,529,&wq[u]->mtx)"
     0 Debug        -
 "MTX_UNLOCK(wrk_decimate_flock,cache_pool.c,542,&wq[u]->mtx)"
     0 Debug        -
 "MTX_LOCK(wrk_decimate_flock,cache_pool.c,529,&wq[u]->mtx)"
     0 Debug        -
 "MTX_UNLOCK(wrk_decimate_flock,cache_pool.c,542,&wq[u]->mtx)"
     0 Debug        - "MTX_LOCK(SES_New,cache_session.c,180,&ses_mem_mtx)"
     0 Debug        -
 "MTX_UNLOCK(SES_New,cache_session.c,182,&ses_mem_mtx)"
     0 Debug        - "WS_Init(0x1ab89a2078, "sess", 0x1ab89a2808, 16384)"
     0 Debug        - "WS(0x1ab89a2078 = (sess, 0x1ab89a2808 0 0 16384)"
     0 Debug        - "MTX_LOCK(WRK_Queue,cache_pool.c,417,&wq[u]->mtx)"
     0 Debug        - "MTX_UNLOCK(WRK_Queue,cache_pool.c,432,&wq[u]->mtx)"
  7057 SessionClose - dropped
  7057 StatSess     - (null) (null) 1250081073 0 0 0 0 0 0 0
     0 Debug        -
 "MTX_LOCK(SES_Delete,cache_session.c,230,&ses_mem_mtx)"
     0 Debug        -
 "MTX_UNLOCK(SES_Delete,cache_session.c,232,&ses_mem_mtx)"
     0 Debug        -
 "MTX_LOCK(wrk_decimate_flock,cache_pool.c,529,&wq[u]->mtx)"
     0 Debug        -
 "MTX_UNLOCK(wrk_decimate_flock,cache_pool.c,542,&wq[u]->mtx)"
     0 Debug        -
 "MTX_LOCK(wrk_decimate_flock,cache_pool.c,529,&wq[u]->mtx)"
     0 Debug        -
 "MTX_UNLOCK(wrk_decimate_flock,cache_pool.c,542,&wq[u]->mtx)"
 }}}

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Ticket URL: <http://varnish.projects.linpro.no/ticket/534#comment:2>
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