Re: "sleeping without a mutex" panic with FixitCD from today's SNAP

Dmitry Morozovsky wrote:
> On Sun, 11 Apr 2004, Scott Long wrote:
> 
> [snip]
> 
> SL> > SL> > <panic: sleeping without a mutex
> SL> > SL> > at line 144 in file /usr/src/sys/kern/kern_synch.c>
> SL> > SL> >
> SL> > SL> > The panic is 100% reproducible.
> SL> > SL>
> SL> > SL> Providing a backtrace from the debugger here is very important.  Any
> SL> > SL> chance that you could do that?
> SL> >
> SL> > My chances are pretty low, as I have no -current systems runnning. I cat write
> SL> > ddb's traceback though if it's helpful (supposedly, I also can make serial
> SL> > console for that).
> SL>
> SL> DDB traceback is fine.  Without some sort of traceback, it's impossible
> SL> to know what is triggering the message in msleep that you are seeing.
> 
> Well, here it is (via serial console):
> 
> RockRidge Extension
> panic: sleeping without a mutex
> at line 144 in file /usr/src/sys/kern/kern_synch.c
> cpuid = 0;
> Debugger("panic")
> Stopped at      Debugger+0x46:  xchgl   %ebx,in_Debugger.0
> db> tr
> Debugger(c07bf6c1) at Debugger+0x46
> __panic(c07bfedf,90,c07bfeb7,653,c08aee6c) at __panic+0x13d
> msleep(c0875ae0,0,1a0,c07d3d27,0) at msleep+0xc2
> random_read(c087b3dc,d7618c88,20000,c07fc6e0,74) at random_read+0x41
> spec_read(d7618bec,d7618c38,c063b84d,d7618bec,d7618c88) at spec_read+0x12c
> spec_vnoperate(d7618bec) at spec_vnoperate+0x13
> vn_read(c47d9330,d7618c88,c1d19600,0,c464b690) at vn_read+0x185
> dofileread(c464b690,c47d9330,4,bfbfe4dc,74) at dofileread+0xb0
> read(c464b690,d7618d14,3,1,296) at read+0x3b
> syscall(2f,2f,2f,855b000,3e) at syscall+0x217
> Xint0x80_syscall() at Xint0x80_syscall+0x1d
> --- syscall (3, FreeBSD ELF32, read), eip = 0x82776ab, esp = 0xbfbfe49c, ebp =
> 0xbfbfe568 ---
> db>
> 
> Combination to reproduce:
> - boot from fixit CD
> - select fixit, live CD
> - Enter to confirm mount
> 
> Any other info we need? (again, it's -current snapshot from 20040410 made on
> 4.9p4)

Excellent, it's exactly the information that is needed.  Thanks!

Scott