stable/10 r258317 - UFS lock problem

[Peter Holm]

On Sat, Dec 07, 2013 at 08:24:32AM +0200, Özkan KIRIK wrote:
> Hi,
> 
> I'm trying to compile a debug kernel with these options :
> 
> makeoptions DEBUG=-g
> options INVARIANTS
>  options INVARIANT_SUPPORT
> options WITNESS
>  options DEBUG_LOCKS
> options DEBUG_VFS_LOCKS
>  options DIAGNOSTIC
> 
> While compiling; compilations fails due to this error :
> /usr/src/sys/kern/subr_vmem.c:1357:1: error: unused function 'vmem_dump'
>     [-Werror, -Wunused-function]
> 

Did you forget "options DDB" ?

- Peter

> 
> I'll comment out this function and recompiled kernel.
> Now, while booting, kernel panics. Error line is below;  KDB stack
> backtrace is attached as PNG screenshot.
> 
> "panic: mtx_lock_spin: recursed on non-recursive mutex cnput_mtx @
> /usr/src/sys/kern/kern_cons.c:500"
> 
> I think, i hit an other bug.
> 
> Best wishes,
> 
> Ozkan KIRIK
> ePati Information Technologies
> http://www.epati.com.tr/
> 
> 
> On Fri, Dec 6, 2013 at 10:13 PM, Konstantin Belousov <kostikbel at gmail.com>wrote:
> 
> > On Fri, Dec 06, 2013 at 08:10:55PM +0200, ?zkan KIRIK wrote:
> > > Hi,
> > >
> > > I am using FreeBSD 10.0-BETA3 r258317 GENERIC kernel.
> > >
> > > I run "portsnap fetch extract".
> > > While extracting files, extracting operation hangs, and i cant kill
> > process.
> > >
> > > Output of : "ps ax | grep D+"  ( uninterruptable process list )
> > > % ps ax | grep D+
> > > 28933  0  D+    0:00.01 tar -xz --numeric-owner -f
> > >
> > /var/db/portsnap/files/77d41f10d2832f8450e4e02a4db5c0a6131c97d15076ed0c76e761c9ce58338d.gz
> > > -C /usr/ports/emulators/qemu/ (bsdtar)
> > > 29051  1  S+    0:00.00 grep D+
> > > %
> > >
> > >
> > > Because of D flag, process cannot be interrupted even by SIGKILL.
> > > I cannot remove usr/ports folder while this process on D+ state.
> > > If I run rm -r /usr/ports, rm process is flagged as D+ also.
> > >
> > > I tested this situation on both vmware workstation and different real
> > > hardware installations. ( Sun Fire X4150, HP DL380G4, Sun X3 servers. )
> > >
> > > Problem is repeatable. If you install FreeBSD on ZFS root, problem
> > doesn't
> > > occur.
> > >
> > >
> > > # mount
> > > /dev/da0p2 on / (ufs, local, journaled soft-updates)
> > > devfs on /dev (devfs, local, multilabel)
> >
> > See
> >
> > http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug-deadlocks.html
> >
> _______________________________________________