5.4 panic at lockmgr

[Kris Kennaway]

On Fri, May 20, 2005 at 04:39:19PM -0700, Kachun Lee wrote:
> Hi,
> 
> I upgraded a server from 4.10 to 5.4-rel and it paniced at soon as I put 
> some load on it...
> 
> panic: lockmgr: thread 0xfffffffe, not exclusive lock holder 0x76fe0300 
> unlocking
> cpuid = 0
> KDB: enter: panic
> [thread pid 101 tid 100112 ]
> Stopped at      0x6f33c5a7:     nop
> db>
> db> trace
> Tracing pid 101 tid 100112 td 0x76fe0300
> kdb_enter(6f4af15b) at 0x6f33c5a7
> panic(6f4add4c,fffffffe,6f4add36,76fe0300,fffffffe) at 0x6f324cc7
> lockmgr(775d57e4,6,775d5738,0,bcd33a1c) at 0x6f319421
> vop_stdunlock(bcd33a4c,bcd33a28,6f2ebb6f,bcd33a4c,bcd33a68) at 0x6f3711c7
> vop_defaultop(bcd33a4c,bcd33a68,6f2ec0fc,bcd33a4c,1000) at 0x6f371077
> spec_vnoperate(bcd33a4c,1000,7f010000,7747fa00,bcd33ab4) at 0x6f2ebb6f
> spec_write(bcd33a94,bcd33ae0,6f448c7d,bcd33a94,2b3) at 0x6f2ec0fc
> spec_vnoperate(bcd33a94) at 0x6f2ebb6f
> vnode_pager_generic_putpages(775d5738,bcd33bf0,1000,0,bcd33b70) at 
> 0x6f448c7d
> vop_stdputpages(bcd33b28,bcd33b14,6f2ebb6f,bcd33b28,bcd33b54) at 0x6f37191e
> vop_defaultop(bcd33b28,bcd33b54,6f448a1a,bcd33b28,1000) at 0x6f371077
> spec_vnoperate(bcd33b28) at 0x6f2ebb6f
> vnode_pager_putpages(774dbe70,bcd33bf0,1,0,bcd33b70) at 0x6f448a1a
> vm_pageout_flush(bcd33bf0,1,0,78a2f300,bcd33bc8) at 0x6f4403e7
> vm_pageout_clean(6f8cc70c) at 0x6f440311
> vm_pageout_scan(0) at 0x6f441192
> vm_pageout(0,bcd33d48) at 0x6f441f12
> fork_exit(6f441c00,0,bcd33d48) at 0x6f30f3bd
> fork_trampoline() at 0x6f46bdcc
> --- trap 0x1, eip = 0, esp = 0xbcd33d7c, ebp = 0 ---
> 
> The hardware is a Intel 7501 with a single 3G Xeon 6G mem. I tried disable 
> option MP and made no difference. Any help or suggestion!?

Run 'show lockedvnods' and then 'trace <pid>' for each pid listed.
Also, if you can explain how to reproduce this it would be greatly
helpful.

Kris
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