Crashed with cdrom umount -f (reproducable)

From: Fabian, Kai <kai.fabian(at)epost.de>
Date: Wed Jan 15 2003 - 13:37:37 EST

Hi,

I am using 3.2 generic kernel. The following commands are used to crash the system:

mkdir /mnt/cdrom
mount /dev/cd0a /mnt/cdrom
cd /mnt/cdrom
umount -f /mnt/cdrom
cd ..

After ENTER the system is killed. No linefeed is showing...

On the console the following messages appear:   uvm_fault(0xd6822ac4, 0x0, 0, 1) -> e
  kernel: page fault trap, code=0
  Stopped at _lookup+0x1ee: movl 0x10(%eax),%edi

This is dmesg:

OpenBSD 3.2 (GENERIC) #25: Thu Oct 3 19:51:53 MDT 2002

    deraadt@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC

cpu0: F00F bug workaround installed
cpu0: Intel Pentium (P54C) ("GenuineIntel" 586-class) 100 MHz
cpu0: FPU,V86,DE,PSE,TSC,MSR,MCE,CX8

real mem = 66695168 (65132K)
avail mem = 56303616 (54984K)
using 839 buffers containing 3436544 bytes (3356K) of memory mainbus0 (root)
bios0 at mainbus0: AT/286+(27) BIOS, date 10/24/96, BIOS32 rev. 0 @ 0xfb380 apm0 at bios0: Power Management spec V1.2 apm0: AC on, battery charge unknown
pcibios0 at bios0: rev. 2.1 @ 0xf0000/0xb92c

pcibios0: PCI BIOS has 5 Interrupt Routing table entries
pcibios0: PCI Interrupt Router at 000:07:0 ("Intel 82371SB PCI-ISA" rev 0x00)
pcibios0: PCI bus #0 is the last bus

bios0: ROM list: 0xc0000/0x8000 0xc8000/0x4000 pci0 at mainbus0 bus 0: configuration mode 1 (bios) pchb0 at pci0 dev 0 function 0 "Intel 82437VX" rev 0x02 pcib0 at pci0 dev 7 function 0 "Intel 82371SB PCI-ISA" rev 0x01 pciide0 at pci0 dev 7 function 1 "Intel 82371SB IDE" rev 0x00: DMA, channel 0 wired to compatibility, channel 1 wired to compatibility wd0 at pciide0 channel 0 drive 0: <QUANTUM FIREBALL SE2.1A> wd0: 16-sector PIO, LBA, 2014MB, 4092 cyl, 16 head, 63 sec, 4124736 sectors wd0(pciide0:0:0): using PIO mode 4, DMA mode 2 siop0 at pci0 dev 10 function 0 "Symbios Logic 53c810" rev 0x12 irq 11 siop0: scsi bus reset
scsibus0 at siop0: 8 targets
siop0: target 6 now using 8 bit 10.0 MHz 8 REQ/ACK offset xfers cd0 at scsibus0 targ 6 lun 0: <PLEXTOR, CD-ROM PX-32TS, 1.01> SCSI2 5/cdrom removable vga1 at pci0 dev 11 function 0 "ATI Mach64 VT" rev 0x40 wsdisplay0 at vga1: console (80x25, vt100 emulation) wsdisplay0: screen 1-5 added (80x25, vt100 emulation) isa0 at pcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5
pckbd0 at pckbc0 (kbd slot)
pckbc0: using irq 1 for kbd slot
wskbd0 at pckbd0: console keyboard, using wsdisplay0 ep0 at isa0 port 0x300/16 irq 12: address 00:20:af:c1:5f:90, utp/aui/bnc (default utp) pcppi0 at isa0 port 0x61
midi0 at pcppi0: <PC speaker>
sysbeep0 at pcppi0
lpt0 at isa0 port 0x378/4 irq 7
npx0 at isa0 port 0xf0/16: using exception 16 pccom0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo pccom1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo fdc0 at isa0 port 0x3f0/6 irq 6 drq 2
fd0 at fdc0 drive 0: 1.44MB 80 cyl, 2 head, 18 sec biomask 4840 netmask 5840 ttymask 58c2
pctr: 586-class performance counters and user-level cycle counter enabled dkcsum: wd0 matched BIOS disk 80
root on wd0a
rootdev=0x0 rrootdev=0x300 rawdev=0x302

Hope that helps.
  Kai Received on Wed Jan 15 13:41:26 2003