panic: sleeping without a mutex (acd related)

Pawel Jakub Dawidek nick at
Tue Nov 25 05:52:27 PST 2003

On Tue, Nov 25, 2003 at 11:21:03AM +0100, Christian Laursen wrote:
+> I have been experiencing some random lockups after upgrading from
+> 5.1-RELEASE to 5.2-BETA.
+> I then wen on and enabled all the debug options in my kernel config
+> hoping to be able to find the cause.
+> But now I cannot boot at all. In the end of the boot process when
+> detecting ATA drives, I get this:
+> ad0: 76319MB <ST380011A> [155061/16/63] at ata0-master UDMA100                  
+> acd0-5: CDROM with 6 CD changer <CD-C68E> at ata1-master PIO4                   
+> acd6: DVDROM <CREATIVEDVD5240E-1> at ata1-slave PIO4                            
+> panic: sleeping without a mutex                                                 
+> Debugger("panic")                                                               
+> Stopped at      Debugger+0x54:  xchgl   %ebx,in_Debugger.0                      
+> db>                                                                             
+> db> trace                                                                       
+> Debugger(c06e3744,c07549a0,c06e3ec9,d861ab60,100) at Debugger+0x54              
+> panic(c06e3ec9,0,c06e3eb8,c06d6584,10) at panic+0xd5                            
+> msleep(c45173d8,0,4c,c06d6584,0) at msleep+0x505                                
+> acd_geom_access(c452de00,1,0,0,0) at acd_geom_access+0x115                      

Yeah. There are two calls of tsleep(9) without timeout set
(in line 499, 509), so this KASSERT is reached:

	KASSERT(timo != 0 || mtx_owned(&Giant) || mtx != NULL,
	    ("sleeping without a mutex"));

Pawel Jakub Dawidek                       pawel at
UNIX Systems Programmer/Administrator
Am I Evil? Yes, I Am!           
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