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

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

Dear Andrew,

On 2020-04-08, Yorick Hardy wrote:
> Dear Andrew,
> 
> On 2020-04-07, Yorick Hardy wrote:
> > Dear Andrew,
> > 
> > On 2020-04-07, Andrew Doran wrote:
> > > Hi Yorick.
> > > 
> > > On Mon, Apr 06, 2020 at 11:16:37PM +0200, Yorick Hardy wrote:
> > > 
> > > >    Crash version 9.99.54, image version 9.99.54.
> > > >    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) ---
> > > >    7f0af7842e9a:
> > > 
> > > Were you running anything noteworthy at the time?  There is a very good
> > > chance that is fixed by revision 1.217 of src/sys/kern/vfs_lookup.c.
> > > 
> > > Thanks,
> > > Andrew
> > 
> > Thanks! It happens often when running wip/urlwatch, which keeps
> > the disk quite busy. I will try a new kernel as soon as I can free
> > up my computer!
> 
> Initial tests are unable to trigger the panic, so it looks promising!
> Let's assume it is fixed, I will continue to use this kernel and report
> back if necessary.
> 
> Thanks again!

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>

but I am not sure what caused it. I will update and try again.

-- 
Kind regards,

Yorick Hardy