[Varnish] #516: vsl_mtx "deadlock"; child stops responding

[Varnish]

#516: vsl_mtx "deadlock"; child stops responding
----------------------+-----------------------------------------------------
 Reporter:  kb        |        Owner:  phk       
     Type:  defect    |       Status:  closed    
 Priority:  normal    |    Milestone:            
Component:  varnishd  |      Version:  2.0       
 Severity:  normal    |   Resolution:  worksforme
 Keywords:            |  
----------------------+-----------------------------------------------------

Comment(by melong001):

 sorry,I just got a error form varnish！！

 The GDB imformation as fellow!!
 could you help me!!
 #0  0xffffe424 in __kernel_vsyscall ()
 #1  0x0058f30e in __lll_mutex_lock_wait () from /lib/tls/libpthread.so.0
 #2  0x0058bf3b in _L_mutex_lock_35 () from /lib/tls/libpthread.so.0
 #3  0xbffb3498 in ?? ()
 #4  0xb77bb2e4 in ?? () from /usr/local/varnishd/lib/libvarnish.so.1
 #5  0xb760221c in ?? ()
 #6  0xbffb3f00 in ?? ()
 #7  0xbffb34b8 in ?? ()
 #8  0x0808a37a in VSL (tag=134962740, id=37, fmt=0xb77b8e88 "Unknown
 request.\nType 'help' for more info.\n")
     at shmlog.c:160
 #9  0x0808a37a in VSL (tag=SLT_CLI, id=0, fmt=0x80a2abb "Rd %s") at
 shmlog.c:160
 #10 0x0805ed31 in cli_cb_before (cli=0xb760221c) at cache_cli.c:90
 #11 0xb77adbb1 in cls_vlu2 (priv=0xb7602200, av=0x860409c0) at
 cli_serve.c:263
 #12 0xb77ae0c6 in cls_vlu (priv=0xb7602200, p=0xaea13000 "ping") at
 cli_serve.c:342
 #13 0xb77b23d7 in LineUpProcess (l=0xb7601440) at vlu.c:157
 #14 0xb77b25b8 in VLU_Fd (fd=7, l=0xb7601440) at vlu.c:182
 #15 0xb77af14e in CLS_Poll (cs=0xb7607430, timeout=-1) at cli_serve.c:532
 #16 0x0805eeb5 in CLI_Run () at cache_cli.c:116
 #17 0x0806fc2b in child_main () at cache_main.c:139
 #18 0x08082234 in start_child (cli=0xb760211c) at mgt_child.c:407
 #19 0x0808301d in mcf_server_startstop (cli=0xb760211c, av=0xb76091c0,
 priv=0x0) at mgt_child.c:658
 #20 0xb77ad920 in cls_dispatch (cli=0xb760211c, clp=0x80b5500,
 av=0xb76091c0, ac=1) at cli_serve.c:231
 #21 0xb77adcc9 in cls_vlu2 (priv=0xb7602100, av=0xb76091c0) at
 cli_serve.c:287
 #22 0xb77ae0c6 in cls_vlu (priv=0xb7602100, p=0xb7667000 "start") at
 cli_serve.c:342
 #23 0xb77b23d7 in LineUpProcess (l=0xb76012e0) at vlu.c:157
 #24 0xb77b25b8 in VLU_Fd (fd=0, l=0xb76012e0) at vlu.c:182
 #25 0xb77aee69 in CLS_PollFd (cs=0xb76073d0, fd=0, timeout=0) at
 cli_serve.c:493
 #26 0x08085a0b in mgt_cli_callback2 (e=0xb76260b0, what=1) at
 mgt_cli.c:386
 #27 0xb77b1df8 in vev_schedule_one (evb=0xb7607370) at vev.c:501

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/516#comment:3>
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