Hi,

I'm having panic about mutex lock for a while with netbsd
current and Xen 3.1.  I reported it to port-xen.  Christoph
suggested me that is NetBSD bug, so I'm sending a problem
report to here this time.

I'm having this problem only while I am using WinXp as domU,
so not sure though.

Is it possible to check following trace?  Thanks.

   On Jul 30,  8:45, Christoph Egger wrote:
   > Subject: Re: mutex fault and no symbol table on recent Dom0 and Xen
   > 
   > The mutex error is a bug in NetBSD.
   > 
   > The missing symbol table is a regression in Xen 3.1.
   > (The symbol table is there with Xen 3.0.4). I am already
   > working on fixing this.
   > 
   > Christoph
   > 
   > 
   > On Sunday 29 July 2007 17:13:15 Kazushi Marukawa wrote:
   > >    On Jul 3,  9:45, Kazushi (Jam) Marukawa wrote:
   > >    > Subject: mutex fault and no symbol table on recent Dom0 and Xen
   > >    > Hi,
   > >    >
   > >    > I'm having difficulties with recent Dom0 kernel.  It crashes
   > >    > with following message.
   > >    >
   > >    >    Mutex error: mutex_vector_exit: exiting unheld spin mutex
   > >    >
   > >    > I tried Dom0 from both 20070627 and 20070701.  Both crashed
   > >    > because of mutex error.  Here is a crash log from 0627.  Not
   > >    > sure why, but db didn't show symbol table.
   > >
   > > I tried recent kernel, 2007/07/26 source codes, and got the
   > > same problem.
   > >
   > > This time, I konw db doesn't work with Xen 3.1, so I hand-
   > > translated addresses to symbol name.  Can someone inspect
   > > this problem?  Thanks.
   > >
   > > -----
   > > Mutex error: mutex_vector_exit: exiting unheld spin mutex
   > >
   > > lock address : 0x00000000c0978280
   > > current cpu  :                  0
   > > current lwp  : 0x00000000cae21e00
   > > owner field  : 0x0000000000000b00 wait/spin: 0/1
   > >
   > > panic: lock error
   > > Stopped in pid 0.2 (system) at  0xc04bbe14:     popl    %ebp
   > > db> trace
   > > ?(c085f60d,cae4eee4,cae4eed8,c0439717,b) at 0xc04bbe14
   > > ?(c083d699,c083c34b,c06ef970,c083c2e7,c0978280) at 0xc04396a5
   > > ?(0,c0978280,c08d198c,c06ef970,c083c2e7) at 0xc0434d21
   > > ?(c0978280,c06ef970,c083c2e7,0,0) at 0xc0414c2c
   > > ?(c0978280,ca003b9a,cae4ef78,e1894609,c0914520) at 0xc0414e0f
   > > ?(0,0,cae4efb8,c04cc0b6,0) at 0xc042b8e0
   > > ?(0,cae4efa8,0,f,fffff000) at 0xc04f42af
   > > ?(0,cad9cbdc,3,1,c04f42bb) at 0xc0103dfd
   > > ?(f,cad9cbdc,cad9cb94,0,0) at 0xc04cc6b7
   > > --- switch to interrupt stack ---
   > > ?(cad9cbdc,0,11,31,ca000011) at 0xc0102550
   > > ?(c040bd50,cae21e00,cad9cc6c,c040bdfe,cae21e00) at 0xc0104323
   > > ?(cae21e00,cad9cc68,c0413b6e,0,cae21e00) at 0xc04be545
   > > ?(cae21e00,0,c01001e7,c01001df,c01001e7) at 0xc040bdfe
   > > db>
   > > -----
   > >
   > > NetBSD's DB cannot read symbol table on Xen 3.1.  Therefore,
   > > I translated it to name by hand.
   > >
   > > -----
   > > Mutex error: mutex_vector_exit: exiting unheld spin mutex
   > >
   > > lock address : 0x00000000c0978280 (sched_mutex)
   > > current cpu  :                  0
   > > current lwp  : 0x00000000cae21e00
   > > owner field  : 0x0000000000000b00 wait/spin: 0/1
   > >
   > > panic: lock error
   > > Stopped in pid 0.2 (system) at  cpu_Debugger+0x4:     popl    %ebp
   > > db> trace
   > > db> trace
   > > cpu_Debugger(c085f60d,cae4eee4,cae4eed8,c0439717,b) at cpu_Debugger+0x4
   > > panic(c083d699,c083c34b,c06ef970,c083c2e7,c0978280) at panic+0x155
   > > lockdebug_abort(0,c0978280,c08d198c,c06ef970,c083c2e7) at
   > > lockdebug_abort+0x61 mutex_abort(c0978280,c06ef970,c083c2e7,0,0) at
   > > mutex_abort+0x3c
   > > mutex_vector_exit(c0978280,ca003b9a,cae4ef78,e1894609,c0914520) at
   > > mutex_vector_exit+0xcf callout_softclock(0,0,cae4efb8,c04cc0b6,0) at
   > > callout_softclock+0x240 softintr_dispatch(0,cae4efa8,0,f,fffff000) at
   > > softintr_dispatch+0x3f Xsoftclock(0,cad9cbdc,3,1,c04f42bb) at
   > > Xsoftclock+0x39
   > > evtchn_do_event(f,cad9cbdc,cad9cb94,0,0) at evtchn_do_event+0xf7
   > > --- switch to interrupt stack ---
   > > call_evtchn_do_event(cad9cbdc,0,11,31,ca000011) at
   > > call_evtchn_do_event+0x1c
   > > hypervisor_callback(c040bd50,cae21e00,cad9cc6c,c040bdfe,cae21e00) at
   > > hypervisor_callback+0x63 cpu_idle(cae21e00,cad9cc68,c0413b6e,0,cae21e00) at
   > > cpu_idle+0x25
   > > idle_loop(cae21e00,0,c01001e7,c01001df,c01001e7) at idle_loop+0xae
   > > db>
   > > -----
   > >
   > > -- Kazushi
   >-- End of excerpt from Christoph Egger

-- Kazushi
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