kern/79058: floppy umount crash

Kyryll A Mirnenko mirya at innovativemarketing.com.ua
Sun Mar 20 11:50:03 PST 2005


>Number:         79058
>Category:       kern
>Synopsis:       floppy umount crash
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Mar 20 19:50:02 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Kyryll A Mirnenko
>Release:        5.4-PRERELEASE
>Organization:
IMU
>Environment:
FreeBSD localhost 5.4-PRERELEASE FreeBSD 5.4-PRERELEASE #20: Sun Mar 13 19:07:18 EET 2005     root at localhost:/usr/src/sys/i386/compile/MY-O3  i386
>Description:
before umounting the floppy i have accidently removed it from the drive, then put it back & tried to umount (there were no attempts to flush disk buffers there while it was out of the drive). Got this:

fsync: giving up on dirty.
0xc16a5948: tag devfs, type VCHP, usecount 2, writecount 0, refcount 8
lock type devfs: EXCL (count 1)
by thread 0xc13e6960 (pid 557)
dev fd0

Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x64
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc0548077
stack pointer = 0x10:0xc7fdcc60
frame pointer = 0x10:0xc1650e10
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 = 561 (umount)
trap number = 12
panic: page fault

Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x64
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc0548077
stack pointer = 0x10:0xc7fdcaec
frame pointer = 0x10:0x0
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 = 561 (umount)
trap number = 12
panic: page fault

More info:
CPU: Pentium II/Pentium II Xeon/Celeron (400.91-MHz 686-class CPU)
  Origin = "GenuineIntel"  Id = 0x665  Stepping = 5
  Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>
fdc0: <Enhanced floppy controller> at port 0x3f0-0x3f5 irq 6 drq 2 on isa0
fd0: <1440-KB 3.5" drive> on fdc0 drive 0
>How-To-Repeat:
as described above

>Fix:
      
>Release-Note:
>Audit-Trail:
>Unformatted:


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