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Date:      Wed, 24 Mar 2004 11:04:03 -0500
From:      Don Bowman <don@sandvine.com>
To:        Don Bowman <don@sandvine.com>, "'current@freebsd.org'" <current@freebsd.org>
Subject:   RE: LOR on current
Message-ID:  <FE045D4D9F7AED4CBFF1B3B813C85337045D86EA@mail.sandvine.com>

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From: Don Bowman [mailto:don@sandvine.com]
> So my machine which has been locking up daily under current
> (cvs up from saturday) this time showed this message to 
> serial before locking up:

And I got another, but this one it recovered from after a ~20s
hang.

machine has 4GB ram, adaptec ASR raid, 2 2.8GHz xeon with
symmetric multi threading yielding 4 processor contexts.
The only process it runs (other than system related stuff)
is postgresql.

lock order reversal
 1st 0xc8eed4a4 vm object (vm object) @ /usr/src/sys/vm/swap_pager.c:1313
 2nd 0xc07738c0 swap_pager swhash (swap_pager swhash) @
/usr/src/sys/vm/swap_pager.c:1803
 3rd 0xc8beb294 vm object (vm object) @ /usr/src/sys/vm/uma_core.c:886
Stack backtrace:
backtrace(0,1,c07422e8,c0743490,c06feafc) at backtrace+0x12
witness_checkorder(c8beb294,9,c06d7841,376) at witness_checkorder+0x593
_mtx_lock_flags(c8beb294,0,c06d7841,376,c8bcb8d4) at _mtx_lock_flags+0x67
obj_alloc(c8bcb8c0,1000,ebefda3b,101,c8bcb8d4) at obj_alloc+0x31
slab_zalloc(c8bcb8c0,1,c8bcb8c0,c8bcb8d4,1) at slab_zalloc+0x82
uma_zone_slab(c8bcb8c0,1,c8bcb8d4,0,c06d7841,68f) at uma_zone_slab+0xb5
uma_zalloc_internal(c8bcb8c0,0,1,c8bcb8d4,0) at uma_zalloc_internal+0x28
uma_zalloc_arg(c8bcb8c0,0,1) at uma_zalloc_arg+0x2f8
swp_pager_meta_build(c8eed4a4,9,0,2,0) at swp_pager_meta_build+0x108
swap_pager_putpages(c8eed4a4,ebefdc00,1,0,ebefdb70) at
swap_pager_putpages+0x2b4
default_pager_putpages(c8eed4a4,ebefdc00,1,0,ebefdb70) at
default_pager_putpages+0x18
vm_pageout_flush(ebefdc00,1,0,c06dcb0c,ca) at vm_pageout_flush+0x11e
vm_pageout_clean(c467c478) at vm_pageout_clean+0x2a5
vm_pageout_scan(0) at vm_pageout_scan+0x54b
vm_pageout(0,ebefdd48,0,c0644404,0) at vm_pageout+0x2d2
fork_exit(c0644404,0,ebefdd48) at fork_exit+0xa8
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xebefdd7c, ebp = 0 ---



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