Possible hammer problem

[Matthew Dillon]

:The lighttpd process got stuck in the select state unkillably. I decided to 
:reboot and got a panic.
:
:syncing disks... 87 87 87 87 87 87 87 87 87 87 87 87 87 87 87 87 87 87 87 87
:giving up on 1 buffers
:Debugger("busy buffer problem")
:Stopped at      Debugger+0x34:  movb    $0,in_Debugger.3949
:db> trace
:Debugger(c05382b5,c053829c,1,0,0) at Debugger+0x34
:boot(0,caf18d34,c04d2fdd,caf18cf0,6) at boot+0x1e2
:sys_reboot(caf18cf0,6,55d93,0,c9708c58) at sys_reboot+0x23
:syscall2(caf18d40) at syscall2+0x1e9
:Xint0x80_syscall() at Xint0x80_syscall+0x36
:db>
:
:Needless to say, lighttpd serves from a hammer partition and also runs from 
:another. Kernel and vmcore are also available:
:
:http://160.114.134.7/~szg/crash081111/ 

    Excellent core dump, I have downloaded it and tracked the problem down
    to a deadlock in the HAMMER code.  I am working on a patch now.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>