system map mutex and zone mutex witness warning

[suresh gumpula]

Thanks Mark and Bryan.  I will apply this change and see if it goes away.

Thanks
Suresh

On Thu, Sep 24, 2015 at 1:41 PM, Mark Johnston <markj at freebsd.org> wrote:

> On Wed, Sep 23, 2015 at 11:04:19PM -0400, suresh gumpula wrote:
> > Hi,
> >      I am seeing the following witness warning while booting on 8.1.
> Is
> > it a known issue and
> > resolved in later kernels ?  Can somebody please comment on this ?
>
> I've seen this occur when multiple threads race to establish a lock
> order: https://svnweb.freebsd.org/changeset/base/284127
>
> The change should apply to 8.1, but there may be other relevant bug
> fixes missing.
>
> >
> > isitmychild: rmatrix mismatch between system map (index 43) and UMA zone
> > (index 57): w_rmatrix[43][57] == 1 but w_rmatrix[57][43] == 0
> > KDB: stack backtrace:
> > kdb_backtrace() at kdb_backtrace+0x3e
> > witness_line() at witness_line+0xca4
> > witness_line() at witness_line+0xcf9
> > witness_releaseok() at witness_releaseok+0x1623
> > witness_checkorder() at witness_checkorder+0x37e
> > _mtx_lock_flags() at _mtx_lock_flags+0x113
> > uma_zalloc_arg() at uma_zalloc_arg+0x1449
> > vmspace_swap_count() at vmspace_swap_count+0xc52
> > uma_zalloc_arg() at uma_zalloc_arg+0x10e6
> > uma_zalloc_arg() at uma_zalloc_arg+0x5ef
> > vmspace_alloc() at vmspace_alloc+0x180
> > vm_map_init() at vm_map_init+0xec
> > vm_map_insert() at vm_map_insert+0x4cb
> > kmem_malloc() at kmem_malloc+0x3de
> > zone_drain() at zone_drain+0x822
> > uma_large_malloc() at uma_large_malloc+0x4e
> > malloc() at malloc+0x251
> > swap_pager_swap_init() at swap_pager_swap_init+0x219
> > vm_pageout_oom() at vm_pageout_oom+0x952
> > fork_exit() at fork_exit+0x185
> > fork_trampoline() at fork_trampoline+0xe
> > --- trap 0, rip = 0, rsp = 0xffffff806bb61d30, rbp = 0 ---
> > Witness disabled.
> >
> >
> > Thanks
> > Suresh
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