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

From: Scott Long (scottl_at_freebsd.org)
Date: 04/11/04

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    Date: Sun, 11 Apr 2004 12:42:30 -0600
To: Dmitry Morozovsky <marck@rinet.ru>

    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

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