Re: Panic: vrelel: bad ref count (9.99.54)

[Yorick Hardy <yorickhardy%gmail.com@localhost>]

Dear Andrew,

On 2020-04-19, Andrew Doran wrote:
> Hi Yorick.
> 
> On Sat, Apr 18, 2020 at 11:00:02AM +0200, Yorick Hardy wrote:
> 
> > > I just had the same panic with 9.99.55:
> > > 
> > >   Crash version 9.99.55, image version 9.99.55.
> > >   crash: _kvm_kvatop(0)
> > >   Kernel compiled without options LOCKDEBUG.
> > >   System panicked: vrelel: bad ref count
> > >   Backtrace from time of crash is available.
> > >   crash> bt
> > >   _KERNEL_OPT_NAGR() at 0
> > >   ?() at 7f7ff7ecf000
> > >   sys_reboot() at sys_reboot
> > >   vpanic() at vpanic+0x181
> > >   vtryrele() at vtryrele
> > >   vcache_dealloc() at vcache_dealloc
> > >   uvm_unmap_detach() at uvm_unmap_detach+0x76
> > >   uvm_unmap1() at uvm_unmap1+0x4e
> > >   uvm_mremap() at uvm_mremap+0x36b
> > >   sys_mremap() at sys_mremap+0x68
> > >   syscall() at syscall+0x227
> > >   --- syscall (number 411) ---
> > >   797459842e9a:
> > >   crash>
> > 
> > The same just happened on 9.99.56 while fetching (POP) mail using mail/fdm.
> 
> Could you file a PR please?  If this panics again could you please run the
> "dmesg" command in crash and find out what it printed about the vnode?  That
> would be very useful.
> 
> Thanks,
> Andrew

I will do so (... perhaps only this weekend).

-- 
Kind regards,

Yorick Hardy