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kern/41400: uhci_poll_hub "c->c_magic == CALLOUT_MAGIC" assertion failure

>Number:         41400
>Category:       kern
>Synopsis:       uhci_poll_hub "c->c_magic == CALLOUT_MAGIC" assertion failure
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun May 10 08:00:01 +0000 2009
>Originator:     YAMAMOTO Takashi <>
>Release:        NetBSD 5.99.11 (see below)

System: NetBSD kaeru 5.99.11
Architecture: i386
Machine: i386
        i got the following during shutdown.
        the kernel was with yamt-nfs-mp branch.
        its uhci.c is identical with rev.1.228.

scsibus1: detached
scsibus0: detached
cd0: detached
pci5: detached
pci2: detached
atapibus0: detached
wd0: detached
ppb4: detached
ppb1: detached
atabus1: detached
atabus0: detached
uhub2: at usb2 (addr 1) disconnected
uhub2: detached
usb2: detached
uhub0: at usb1 (addr 1) disconnected
uhub0: detached
usb1: detached
uhub1: at usb0 (addr 1) disconnected
uhub1: detached
panic: kernel diagnostic assertion "c->c_magic == CALLOUT_MAGIC" failed: file 
"/siro/nbsd/nfs-mp/src/sys/kern/kern_timeout.c", line 384
fatal breakpoint trap in supervisor mode
trap type 1 code 0 eip c017bc24 cs 8 eflags 246 cr2 bb95c000 ilevel 2
Stopped in pid 0.5 (system) at  netbsd:breakpoint+0x4:  popl    %ebp
db{0}> t
dc,1,c05e8300) at netbsd:breakpoint+0x4
2,c0563c54) at netbsd:panic+0x1c9
c05d9ae0,c4cf5b00) at netbsd:__kernassert+0x39
,0) at netbsd:callout_reset+0xc6
05db348,c044c6d0) at netbsd:uhci_poll_hub+0x4c
t netbsd:callout_softclock+0x368
softint_dispatch(d4f8ec80,2,0,0,0,0,d6f12d90,d6f12c64,d702099c,0) at netbsd:soft
DDB lost frame for netbsd:Xsoftintr+0x3d, trying 0xd6f12d88
Xsoftintr() at netbsd:Xsoftintr+0x3d
fatal page fault in supervisor mode
trap type 6 code 0 eip c01881e0 cs 8 eflags 10246 cr2 0 ilevel 8
kernel: supervisor trap page fault, code=0
Faulted in DDB; continuing...
db{0}> x/x c05b0bc0
netbsd:wsdisplay_noemul_ca+0x20:        0


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