Date: Tue, 17 Apr 2007 17:26:15 +0200 From: Andre Oppermann <andre@freebsd.org> To: Kris Kennaway <kris@obsecurity.org> Cc: current@FreeBSD.org, net@FreeBSD.org Subject: Re: Page fault in syncache_drop Message-ID: <4624E717.1040208@freebsd.org> In-Reply-To: <20070416193727.GA66684@xor.obsecurity.org> References: <20070416193727.GA66684@xor.obsecurity.org>
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Kris Kennaway wrote: > 8-core amd64, up-to-date CVS sources > > Fatal trap 12: page fault while in kernel mode > cpuid = 0; apic id = 00 > fault virtual address = 0x0 > fault code = supervisor read data, page not present > instruction pointer = 0x8:0xffffffff803134b4 > stack pointer = 0x10:0xffffffffabe09890 > frame pointer = 0x10:0xffffffffabe098a0 > code segment = base 0x0, limit 0xfffff, type 0x1b > = DPL 0, pres 1, long 1, def32 0, gran 1 > processor eflags = interrupt enabled, resume, IOPL = 0 > current process = 37 (irq31: bge0) > [thread pid 37 tid 100043 ] > Stopped at syncache_drop+0x4: cmpq $0,(%rdi) > db> wh > Tracing pid 37 tid 100043 td 0xffffff00b9409580 > syncache_drop() at syncache_drop+0x4 > syncache_add() at syncache_add+0x263 > tcp_input() at tcp_input+0x7e0 > ip_input() at ip_input+0x69d > netisr_dispatch() at netisr_dispatch+0x51 > ether_demux() at ether_demux+0x19f > ether_input() at ether_input+0x3a8 > bge_rxeof() at bge_rxeof+0x3ad > bge_intr() at bge_intr+0x11b > ithread_execute_handlers() at ithread_execute_handlers+0x15d > ithread_loop() at ithread_loop+0x69 > fork_exit() at fork_exit+0x93 > fork_trampoline() at fork_trampoline+0xe > --- trap 0, rip = 0, rsp = 0xffffffffabe09d30, rbp = 0 --- Fixed in rev. 1.110 of sys/netinet/tcp_syncache.c. -- Andre
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