On Sun, 27 Jan 2013, Patrick Welche wrote:
>
> More details - so we now know that the page is BUSY. Sadly an
> attempt at a core dump to a separate disk failed and this is
> before I connect the serial port block to the motherboard...
>
> Cheers,
>
> Patrick
>
>
> PID LID S CPU FLAGS STRUCT LWP * NAME WAIT
> 13322 6 3 3 0 ffff fe82 013f 42c0 vlc uvn_fp2
>
> vlc: proc ffff fe81 702c 4cf8 vmspace/map ffff fe81 c79f e5c8 flags 4000
> lwp 6 ffff fe82 013f 42c0 pcb ffff fe81 21ff 5d80
> stat 3 flags 0 cpu 3 pri 43
> wmesg uvn_fp2 wchan ffff 8000 0827 2390
>
> PAGE 0xffff 8000 0827 2390:
> flags=0x4f<BUSY,WANTED,TABLED,CLEAN,FAKE>, pqflags=0x0, wire_count=0,
> pa=0x4468 8000
> uobject=0xffff fe81 8ef3 9270, uanon=0x0, offset=0x8ee 0000 loan_count=0
> [page ownership tracking disabled]
> checking object list
> page found on object list
Hm. BUSY usually means I/O in progress, and FAKE indicates the page is
still being initialized, probably reading data from disk.
WANTED was probably set by the thread in uvn_fp2 state so it'll get woken up.
TABLED means it's on an object's list.
>
> OBJECT 0xffff fe81 8ef3 9270:
> locked=0, pgops=0xffff ffff 808f d9e0, npages=38064, refs=1
>
> VNODE flags 0x30<MPSAFE,LOCKSWORK>
> mp 0xffff fe81 0e37 a008 numoutput 0 size 0x1fe3d08f writesize 0x1fe3d08f
> data 0xffff fe81 5ea4 4900 writecount 0 holdcnt 6
> tag VT_UFS(1) type VREG(1)
> mount 0xffff fe81 0e37 a008
> typedata 0xffff fe81 8a0f 74c8
> v_lock 0xffff fe81 8ef3 9380
Let's see.
VREG and VT_UFS indicate it's a normal file on a UFS filesystem.
numoutput of 0 means there are no pending writes on this vnode.
Isn't there a /f flag to dump more vnode information?
If we had the inode number, we could hunt it down from the mountpoint to
figure out which file this is.
>
> v_uobj.vmobjlock lock details:
> lock address : 0xffff fe80 5d68 6640 type: sleep/adaptive
> initialized : 0xffff ffff 8046 52a5
> shared holds = shared wanted = current cpu = 0
> current lwp : 0xffff fe82 1f55 3840 last held : 0 <--- LWP different...
> last locked : 0xffff ffff 8074 a6d2 unlocked*: 0xffff ffff 8074 a708
> owner field : 0 wait/spin : 0/0
Looks like the lock is free at the moment.
>
> Turnstile chain at 0xffff ffff 80c4 7e40
> => No active turnstile for this lock.
>
>
> lwp_t ffff fe82 1f55 3840
> system: pid 0 proc ffff ffff 80c3 1000 vmspace/map ffff ffff 80c6 a980 flags
> 20002
> lwp 2 [idle/0] ffff fe82 1f55 3840 pcb ffff fe81 0e07 8d80
> stat 7 flags 201 cpu 0 pri 0
>
> mount:
> flag=MNT_LOG,MNT_LOCAL
> iflag=IMNT_MPSAFE,IMNT_HAS_TRANS,IMNT_DTYPE
> locked vnodes = 0xffff fe81 8ef3 9270
>
> db{0}> show ncache fffffe818ef39270
> name not found
>
> lock address : 0xffff fe81 8ef3 9380 type: sleep/adaptive
> initialized : 0xffff ffff 8077 c329
> shared holds : 1 exclusive : 0
> shared wanted: 0 exclusive : 0
> current cpu : 0 last held : 3
> current lwp : 0xffff fe82 1f55 3840 last held : 0xffff fe82 013f 42c0
> last locked : 0xffff ffff 802a b74c unlocked* : 0xffff ffff 802a b7bd
> owner/count : 0x10 flags: 0
>
> Turnstile chain at 0xffff ffff 80c4 80c0
> => No active turnstile for this lock.
>
>
> db{0}> reboot 0x104
> usbd_do_request: not in process context
> usbd_do_request: not in process context
> usbd_do_request: not in process context
>