Hrmmm, there may be a logic problem here. Try this (apply it manually,
as I am not able to produce a diff at this time):
change:
if ((__mcnt == NULL) (m_alloc_ref(1) == 0))
panic("mbuf subsystem: out of ref counts!");
to:
if (__mcnt == NULL) {
if (m_alloc_ref(1) != 0)
__mcnt = mext_refcnt_free;
else
panic("mbuf subsystem: out of ref counts!");
}
It could be that the m_alloc_ref(1) doesn't fail, but that __mcnt
is still NULL, it's missing that __mcnt = mext_refcnt_free assignment.
This is most probably a BUG, so please commit the fix...
If this does not solve the problem, we may be looking at a newly
uncovered problem in fxp, although I doubt this.
-Bosko
[EMAIL PROTECTED]
- Original Message -
From: "John Polstra" [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
Sent: Saturday, August 19, 2000 6:21 PM
Subject: Instant panic in _MEXT_ALLOC_CNT
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
[EMAIL PROTECTED]:/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=0x183f9ffFPU,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
0xe000-0xefff 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
0xdf00-0xdf0f,0xdf80-0xdf800fff 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 0xf, 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: movl0(%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
