kern/104406: [ufs] Processes get stuck in "ufs" state
underpersistent CPU load
oleg at vsi.ru
Sat Oct 20 01:45:19 PDT 2007
> > > Can anyone take a look on PR kern/104406 ? I got repeatable hang
> > > but I can't obtain a kernel dump to get result of all show commands
> > > here:
> > >
> > >
> > >
> > > After my break to debugger using Ctrl+Alt+Esc sequence and entering a
> > > "panic" command kernel does not wrote a kernel dump but seems to hang.
> > > anyone describe how to obtain a kernel dump in this situation, or at
> > > say - which output of show commands need in first place to debug this
> > > Output of all suggested commands is huge and I afraid of making
> > > when carrying this output from screen to list of paper and back :-)
> This very easy to reproduce [ufs] uninterruptable deadlock
> for both of RELENG_6 and RELENG_7. Look at this PR:
> The PR is closed but the problem is still here with 7.0-PRERELEASE
> and, perhaps, CURRENT.
This is probably another bug because:
1. I built kernel with INVARIANTS as described in on "Debugging Deadlocks"
page of FreeBSD Developers' Handbook and got no panic, but only deadlock;
2. I have no NTFS filesystem at all and just do a copy of file(s) from FTP
to local UFS using mc. In this PR panic occured when NTFS mounted r/w (and
NOT occured when the same NTFS mounted r/o).
Oleg Derevenetz <oleg at vsi.ru> OOD3-RIPE
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