Re: KASSERT umap->refcount != 0 failed (sys/uvm/uvm_bio.c:248)

[Nicolas Joly <njoly%pasteur.fr@localhost>]

On Fri, Apr 30, 2010 at 05:52:29PM +0100, Mindaugas Rasiukevicius wrote:
> Hello,
> 
> Nicolas Joly <njoly%pasteur.fr@localhost> wrote:
> > While stress testing the network interfaces on a new -current
> > NetBSD/amd64 server which has 64GB of ram, the following KASSERT
> > fired:
> > 
> > panic: kernel diagnostic assertion "umap->refcount != 0" failed: file
> > "/local/src/NetBSD/src/sys/uvm/uvm_bio.c", line 248 fatal breakpoint trap
> > in supervisor mode trap type 1 code 0 rip ffffffff80229d65 cs 8 rflags 246
> > cr2  ffff8000d1c21000 cpl 0 rsp ffff8000d2c87430 Stopped in pid 496.1 (dd)
> > at    netbsd:breakpoint+0x5:  leave db{0}> bt
> > breakpoint() at netbsd:breakpoint+0x5
> > panic() at netbsd:panic+0x2ba
> > kern_assert() at netbsd:kern_assert+0x2d
> > ubc_fault() at netbsd:ubc_fault+0x4c9
> > uvm_fault_internal() at netbsd:uvm_fault_internal+0x469
> > trap() at netbsd:trap+0x702
> > --- trap (number 0) ---
> 
> Weird.  What other CPUs do?

I just tested it again, but with SMP disabled (boot -1), and got the
same panic.

-- 
Nicolas Joly

Biological Software and Databanks.
Institut Pasteur, Paris.