New subject: [Bug 693912] system freeze during open('/dev/rfcomm0')

15 May 2011

      https://bugzilla.novell.com/show_bug.cgi?id=693912

https://bugzilla.novell.com/show_bug.cgi?id=693912#c0

           Summary: system freeze during open('/dev/rfcomm0')
    Classification: openSUSE
           Product: openSUSE 11.4
           Version: Final
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Kernel
        AssignedTo: kernel-maintainers@forge.provo.novell.com
        ReportedBy: jw@novell.com
         QAContact: qa@suse.de
          Found By: ---
           Blocker: ---

I have set up tethering via bluetooth. The connect script uses cinternet,
smpppd, to talk to my telephone modem through /dev/rfcomm0
Works usually fine.

When the bluetooth connection cannot be establised, (too far away, phone
switched off, ...) the system freezes until the open() syscall times out.

I can reproduce with a simple 
  strace dd if=/dev/rfcomm0
..
open("/dev/rfcomm0", O_RDONLY|O_LARGEFILE) = 
-1 EHOSTDOWN (Host is down)
..

While the process hangs in open, I can move the mouse. As soon as I type
anything, the system freezes. No mouse movement, the typed characters are lost.
The system resumes normal operation, as soon as the open call returns.

In 11.3 such freezes were not encountered.

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[Bug 693912] New: system freeze during open('/dev/rfcomm0')

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