>Number:         19613
>Category:       kern
>Synopsis:       Locking problem in uvm_map_clip_start
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Dec 30 13:20:01 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Juergen Hannken-Illjes
>Release:        NetBSD 1.6K
>Organization:
	
>Environment:
	
	
System: NetBSD dancer 1.6K NetBSD 1.6K (CUSTOM) #173: Fri Dec 27 09:57:23 MET 2002 hannken@dancer:/usr/obj/kern.i386/CUSTOM i386
Architecture: i386
Machine: i386
>Description:
A LOCKDEBUG enabled kernel under high pressure (dbench 96 -- 96 processes
stressing one file system) gives:

pool_get(PR_WAITOK) with held simple_lock 0xc03dbcb8 CPU 0 /sys/kern/vfs_subr.c:462
pool_get(c041e8e0,2,3da,c02a355c,c105b780) at pool_get+0x57
uvm_map_clip_start(c03f0a40,c105b780,e4ae1000,c02a4755,c03f0b20) at uvm_map_clip_start+0xe2
uvm_unmap_remove(c03f0a40,e4ae1000,e4ae2000,e41dca0c,0) at uvm_unmap_remove+0x5d
uvm_unmap(c03f0a40,e4ae1000,e4ae2000,601727,0) at uvm_unmap+0x10e
uvm_km_kmemalloc(c03f0a40,c03f0940,1000,600000,0) at uvm_km_kmemalloc+0x141
uvm_km_alloc_poolpage1(c03f0a40,c03f0940,0,c023025b,c1162e18) at uvm_km_alloc_poolpage1+0x3b
pool_page_alloc_nointr(c041cd80,0,0,c01edaa6,0) at pool_page_alloc_nointr+0x23
pool_allocator_alloc(c041cd80,0,e41dcb30,c02418a2,c041cdec) at pool_allocator_alloc+0x1f
pool_get(c041cd80,0,1ce,c0209e5e,e41dcbbc) at pool_get+0x1eb
getnewvnode(1,c1162e00,c0f77200,e41dcbbc,8000) at getnewvnode+0xbb
ffs_vget(c1162e00,551de,e41dcc74,ffffffff,e49de99c) at ffs_vget+0x4f
ffs_valloc(e41dcc2c,e49de99c,200,c0269fae,8180) at ffs_valloc+0xef
VOP_VALLOC(e49de99c,8180,c11aa280,e41dcc74,e41dcddc) at VOP_VALLOC+0x3b
ufs_makeinode(8180,e49de99c,e41dcef0,e41dcf04,e49de99c) at ufs_makeinode+0x5c
ufs_create(e41dcddc,3e109ea7,e41dce00,c026a18b,e41dce3c) at ufs_create+0x2c
VOP_CREATE(e49de99c,e41dcef0,e41dcf04,e41dce3c,e49de99c) at VOP_CREATE+0x3b
vn_open(e41dcee0,203,180,e41d9000,e41dcf80) at vn_open+0xad
sys_open(e4137df0,e41dcf80,e41dcf78,e4137df0,0) at sys_open+0xc5
syscall_plain(1f,1f,bfbf001f,1f,bfbfb762) at syscall_plain+0xa7
	
>How-To-Repeat:
dbench 96
	
>Fix:
	
>Release-Note:
>Audit-Trail:
>Unformatted: