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

[Andrew Doran <ad%netbsd.org@localhost>]

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