Today's kernel hangs unmounting /mfs, then crashes during DDB "trace":
NetBSD 4.99.62 (GENERIC) #59: Sun May 11 13:09:51 EDT 2008
historically# reboot -q
syncing disks... 6 done
unmounting file systems...
unmounting /kern (kernfs)...ok,
unmounting /tmp (mfs:156)...[halt sent]
Stopped in pid 0.15 (system) at netbsd:breakpoint+0x4: popl %ebp
db{1}> trace
breakpoint(0,3f8,5,2,c0b9f360,c301850c,d132cf6c,c30ae03c,c30af000,800) at
netbsd:breakpoint+0x4
comintr(c3018400,d1320c50,deadbeef,1,46353148,9,0,0,0,0) at netbsd:comintr+0x575
DDB lost frame for netbsd:Xintr_ioapic_edge1+0xa9, trying 0xd132cf74
Xintr_ioapic_edge1() at netbsd:Xintr_ioapic_edge1+0xa9
--- interrupt ---
--- switch to interrupt stack ---
x86_pause(1,64,c01aaa60,0,104,c0b9f360,d1320d40,c04c2d33,0,cc6b09c0) at
netbsd:x86_pause+0x2
nd6_timer(0,cc6b09c0,7,d1324000,d1316074,d1324068,d1324870,d1325070,d1325870,c01aaa60)
at netbsd:nd6_timer+0x4e
callout_softclock(0,0,0,0,0,0,0,0,0,0) at netbsd:callout_softclock+0x243
softint_dispatch(cc6a9280,2,0,0,0,0,d1320d90,d1320d28,cc6b09c0,28) at
netbsd:softint_dispatch+0xb7
DDB lost frame for netbsd:Xsoftintr+0x3d, trying 0xd1320d88
Xsoftintr() at netbsd:Xsoftintr+0x3d
--- interrupt ---
Reader / writer lock error: rw_vector_enter: assertion failed: !cpu_intr_p()
lock address : 0x00000000c0baf984 type : sleep/adaptive
shared holds : 0 exclusive: 0
shares wanted: 0 exclusive: 0
current cpu : 1 last held: 1
current lwp : 0x00000000cc6b09c0 last held: 000000000000000000
last locked : 0x00000000c044a449 unlocked : 0x00000000c044d97b
initialized : 0x00000000c04497ca
owner/count : 000000000000000000 flags : 0x0000000000000008
Turnstile chain at 0xc0bb1380.
=> No active turnstile for this lock.
panic: LOCKDEBUG
Stopped in pid 0.15 (system) at netbsd:breakpoint+0x4: popl %ebp
db{1}> x/I 0x00000000c04497ca
netbsd:uvm_map_setup+0x7a: movl $0xc0a5e73e,%eax
db{1}> x/I 0x00000000c044a449
netbsd:vm_map_lock+0x69: movl 0x8(%ebx),%edx
db{1}> x/I 0x00000000c044d97b
netbsd:uvmspace_fork+0x2cb: movl 0x8(%ebp),%edx
db{1}>
--
Greg A. Woods
Planix, Inc.
<woods%planix.com@localhost> +1 416 489-5852 x122 http://www.planix.com/
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