Date: Sat, 11 Sep 2004 03:06:19 -0700 From: Julian Elischer <julian@elischer.org> To: Don Lewis <truckman@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: page fault in sched_pin() Message-ID: <4142CE1B.3000100@elischer.org> In-Reply-To: <200409110959.i8B9xj01048328@gw.catspoiler.org> References: <200409110959.i8B9xj01048328@gw.catspoiler.org>
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yeah we know and are just committing the fix.. Don Lewis wrote: > I just cvsup'ed a few hours ago and I'm getting a page fault in > sched_pin() early in the boot process. It looks like a NULL pointer > dereference. I'm using SCHED_4BSD+PREEMPTION. > > It looks like the problem is that proc0_init() (which calls schedinit()) > needs to be called before kmeminit(), so that the thread0->td_sched is > initialized before it is dereferenced in sched_pin(). > > The SYSINIT for kmeminit() is SI_SUB_KMEM, which is defined as > 0x1800000, while the SYSINIT for proc0_init() is SI_SUB_INTRINSIC, which > is defined as 0x2200000. > > An alternative would be to make sched_pin() a no-op this early in the > boot process. > > > Copyright (c) 1992-2004 The FreeBSD Project. > Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 > The Regents of the University of California. All rights reserved. > FreeBSD 6.0-CURRENT #241: Sat Sep 11 02:23:16 PDT 2004 > dl@scratch.catspoiler.org:/usr/obj/usr/src/sys/GENERICSMB > WARNING: WITNESS option enabled, expect reduced performance. > kernel trap 12 with interrupts disabled > > > Fatal trap 12: page fault while in kernel mode > cpuid = 0; apic id = 00 > fault virtual address = 0x30 > fault code = supervisor write, page not present > instruction pointer = 0x8:0xc0620c47 > stack pointer = 0x10:0xc0c21cc0 > frame pointer = 0x10:0xc0c21cc0 > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, def32 1, gran 1 > processor eflags = resume, IOPL = 0 > current process = 0 () > [thread 0] > Stopped at sched_pin+0xf: incl 0x30(%eax) > db> tr > sched_pin(c0c21cdc,c07a0edc,c1047828,bfeff000,c103a000) at sched_pin+0xf > pmap_zero_page(c1047828,bfeff000,c103a000,c0c21cf4,c075f724) at pmap_zero_page+0x35 > pmap_growkernel(d6247000) at pmap_growkernel+0xf4 > vm_map_findspace(c103a000,bfeff000,14000000,c08d3c3c) at vm_map_findspace+0x118 > vm_map_find(c103a000,0,0,0,c08d3c3c,14000000,1,7,7,0) at vm_map_find+0x41 > kmem_suballoc(c103a000,c08d3c3c,c08d3c40,14000000,14000) at kmem_suballoc+0x36 > kmeminit(0,c1ec00,c1e000,0,c0440b85) at kmeminit+0xe5 > mi_startup() at mi_startup+0x96 > begin() at begin+0x2c > db> > > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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