> > 0xcb893424  6379        4  4         0xc04023d0 cron (flt_pmfail2)
> > 0xcb6997c0  6377     4006  4         0xc04023d0 pax (uvn_fp1)
> > 0xcb893244  6349    20204  3         0xc07460d4 raidio0 (raidiow)
> > 0xcb7fc998  6348    20204  3         0xc04023d0 raid0 (km_getwait2)
> 
> This looks like an "out of kernel memory" problem.

More strictly, a backend requires memory to clean dirty page which
needs to be cleand to get free memroy, I guess.

> PR#12384 seems to be completely unrelated, so I"m guessing you had a
> different PR in mind :-)

Probably, it is 123 *48*.

enami.