Date: Sat, 19 Aug 2000 15:21:11 -0700 (PDT) From: John Polstra <jdp@polstra.com> To: current@freebsd.org Subject: Instant panic in _MEXT_ALLOC_CNT Message-ID: <XFMail.000819152111.jdp@polstra.com>
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With sources from this morning I am getting an instant kernel-mode page fault in the new mbuf cluster reference counting code. It is failing in this statement of _MEXT_ALLOC_CNT (sys/mbuf.h), as far as I can tell: #define _MEXT_ALLOC_CNT(m_cnt) MBUFLOCK( \ union mext_refcnt *__mcnt; \ \ __mcnt = mext_refcnt_free; \ if ((__mcnt == NULL) && (m_alloc_ref(1) == 0)) \ panic("mbuf subsystem: out of ref counts!"); \ mext_refcnt_free = __mcnt->next_ref; \ [*crash*] Here is the console output and a stack trace from DDB: Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 The Regents of the University of California. All rights reserved. FreeBSD 5.0-CURRENT #0: Sat Aug 19 14:49:39 PDT 2000 jdp@blake.polstra.com:/local0/obj/local0/src/sys/BLAKE Timecounter "i8254" frequency 1193163 Hz Timecounter "TSC" frequency 400902857 Hz CPU: Pentium II/Pentium II Xeon/Celeron (400.90-MHz 686-class CPU) Origin = "GenuineIntel" Id = 0x653 Stepping = 3 Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36 ,MMX,FXSR> real memory = 134205440 (131060K bytes) avail memory = 127336448 (124352K bytes) Preloaded elf kernel "kernel" at 0xc034b000. Pentium Pro MTRR support enabled npx0: <math processor> on motherboard npx0: INT 16 interface pcib0: <Intel 82443BX (440 BX) host to PCI bridge> on motherboard pci0: <PCI bus> on pcib0 pci0: <Intel 82443BX (440 BX) host to PCI bridge> at 0.0 pcib1: <Intel 82443BX (440 BX) PCI-PCI (AGP) bridge> at device 1.0 on pci0 pci1: <PCI bus> on pcib1 pci1: <Matrox MGA G400 AGP graphics accelerator> at 0.0 irq 11 isab0: <Intel 82371AB PCI to ISA bridge> at device 4.0 on pci0 isa0: <ISA bus> on isab0 pci0: <Intel PIIX4 ATA controller> at 4.1 pci0: <Intel 82371AB/EB (PIIX4) USB controller> at 4.2 intpm0: <Intel 82371AB Power management controller> port 0xe800-0xe80f irq 9 at device 4.3 on pci0 intpm0: I/O mapped e800 intpm0: intr IRQ 9 enabled revision 0 smbus0: <System Management Bus> on intsmb0 smb0: <SMBus general purpose I/O> on smbus0 intpm0: PM I/O mapped e400 ahc0: <Adaptec aic7890/91 Ultra2 SCSI adapter> port 0xd000-0xd0ff mem 0xe0000000-0xe0000fff irq 5 at device 6.0 on pci0 ahc0: aic7890/91 Wide Channel A, SCSI Id=7, 32/255 SCBs fxp0: <Intel Pro 10/100B/100+ Ethernet> port 0xb800-0xb83f mem 0xdf000000-0xdf0fffff,0xdf800000-0xdf800fff irq 12 at device 10. 0 on pci0 Fatal trap 12: page fault while in kernel mode fault virtual address = 0x0 fault code = supervisor read, page not present instruction pointer = 0x8:0xc02126ac stack pointer = 0x10:0xc035fea8 frame pointer = 0x10:0xc035febc code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, def32 1, gran 1 processor eflags = interrupt enabled, resume, IOPL = 0 current process = 0 (swapper) interrupt mask = net tty bio cam kernel: type 12 trap, code=0 Stopped at fxp_add_rfabuf+0x170: movl 0(%ebx),%eax db> trace fxp_add_rfabuf(c0a52c00,0) at fxp_add_rfabuf+0x170 fxp_attach_common(c0a52c00,c0a52cd8) at fxp_attach_common+0xb8 fxp_attach(c0a4ad80,c0a4ad80,c0a49600,c0a49580,0) at fxp_attach+0x1ad device_probe_and_attach(c0a4ad80) at device_probe_and_attach+0x8e bus_generic_attach(c0a49580,c0a49580,c0a49700,c0a49600,0) at bus_generic_attach+0x16 device_probe_and_attach(c0a49580) at device_probe_and_attach+0x8e bus_generic_attach(c0a49600,c0a49600,c071b680,c0a49700,0) at bus_generic_attach+0x16 device_probe_and_attach(c0a49600) at device_probe_and_attach+0x8e bus_generic_attach(c0a49700,c0a35080,c035ffc0,c0170c46,c0a49700) at bus_generic_attach+0x16 nexus_attach(c0a49700,c0a49700,c02c0e10,364000,0) at nexus_attach+0xd device_probe_and_attach(c0a49700) at device_probe_and_attach+0x8e root_bus_configure(c071b680,c029bacc,0) at root_bus_configure+0x16 configure(0,35dc00,364000,0,c011dc09) at configure+0x33 mi_startup(0,0,0,0,0) at mi_startup+0x68 begin() at begin+0x30 John -- John Polstra jdp@polstra.com John D. Polstra & Co., Inc. Seattle, Washington USA "Disappointment is a good sign of basic intelligence." -- Chögyam Trungpa To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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