Date: Wed, 30 Jun 2004 16:56:05 GMT From: Nokilai Saoukh <nms@nns.ru> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/68523: WITNESS Report: lock order reversal Message-ID: <200406301656.i5UGu56V019463@www.freebsd.org> Resent-Message-ID: <200406301700.i5UH0ilQ061117@freefall.freebsd.org>
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>Number: 68523
>Category: kern
>Synopsis: WITNESS Report: lock order reversal
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Jun 30 17:00:44 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator: Nokilai Saoukh
>Release: FreeBSD 5.2-CURRENT
>Organization:
none
>Environment:
FreeBSD xxx.org 5.2-CURRENT FreeBSD 5.2-CURRENT #1: Wed Jun 30 13:25:36 MSD 2004 nms@xxx.org:/usr/obj/usr/src/sys/C2 i386
>Description:
lock order reversal
1st 0xc22dc6b4 vm object (vm object) @ /usr/src/sys/vm/swap_pager.c:1311
2nd 0xc069c5a0 swap_pager swhash (swap_pager swhash) @ /usr/src/sys/vm/swap_pager.c:1797
3rd 0xc21c1bdc vm object (vm object) @ /usr/src/sys/vm/uma_core.c:923
Stack backtrace:
backtrace(0,1,c0667cd8,c0668f20,c063585c) at backtrace+0x12
witness_checkorder(c21c1bdc,9,c061cd34,39b) at witness_checkorder+0x53b
_mtx_lock_flags(c21c1bdc,0,c061cd34,39b,c21a1288) at _mtx_lock_flags+0x57
obj_alloc(c2198dc0,1000,dc8c8a1f,101,dc8c8a2c) at obj_alloc+0x31
slab_zalloc(c2198dc0,1,c2198dc0,c2198dc0,c21a1280) at slab_zalloc+0x87
uma_zone_slab(c2198dc0,1,c21a1288,0,c061cd34,798) at uma_zone_slab+0xb0
uma_zalloc_internal(c2198dc0,0,1,c21a1288,0) at uma_zalloc_internal+0x29
uma_zalloc_arg(c2198dc0,0,1) at uma_zalloc_arg+0x2a2
swp_pager_meta_build(c22dc6b4,5,0,2,0) at swp_pager_meta_build+0x108
swap_pager_putpages(c22dc6b4,dc8c8bf0,4,0,dc8c8b60) at swap_pager_putpages+0x2a8
default_pager_putpages(c22dc6b4,dc8c8bf0,4,0,dc8c8b60) at default_pager_putpages+0x18
vm_pageout_flush(dc8c8bf0,4,0,c0667540,2ff) at vm_pageout_flush+0x112
vm_pageout_clean(c19b2bb8) at vm_pageout_clean+0x2a5
vm_pageout_scan(0,c069caa0,0,c061cb28,5a7) at vm_pageout_scan+0x543
vm_pageout(0,dc8c8d48,0,c05a016c,0) at vm_pageout+0x2cf
fork_exit(c05a016c,0,dc8c8d48) at fork_exit+0x98
fork_trampoline() at fork_trampoline+0x8
--- trap 0x1, eip = 0, esp = 0xdc8c8d7c, ebp = 0 ---
E
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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