On Thu, Sep 28, 2017 at 02:19:46AM -0700, Sasha Levin wrote: > Hi all, > > I seem to be hitting the following warning when offlining CPUs on the > latest -next kernel: > > [289683102.607076] Unregister pv shared memory for cpu 8 > [289683102.622922] select_fallback_rq: 3 callbacks suppressed
This is because you hit a printk() from the scheduler, that's known broken (along with the rest of printk). You forgot to actually include that printk() though I suspect it reads like: "process %d (%s) no longer affine to cpu%d\n" Now that uses printk_deferred() which _should_ work lots better, but clearly the printk() stuff went wobbly again. > [289683102.626292] vprintk_emit (kernel/printk/printk.c:1876) > [289683102.626294] vprintk_default (kernel/printk/printk.c:1918) > [289683102.626295] vprintk_func (kernel/printk/printk_safe.c:382) > [289683102.626297] printk (kernel/printk/printk.c:1943) > [289683102.626299] ? show_regs_print_info (kernel/printk/printk.c:1943) > [289683102.626301] ? lock_acquire (kernel/locking/lockdep.c:4004) > [289683102.626306] ___ratelimit (lib/ratelimit.c:52) > [289683102.626309] __printk_ratelimit (kernel/printk/printk.c:2874) > [289683102.626311] select_fallback_rq (kernel/sched/core.c:1525 > (discriminator 1)) > [289683102.626313] sched_cpu_dying (kernel/sched/core.c:5500 > kernel/sched/core.c:5687) Also, could you pretty please not line wrap logs?
