On (09/04/19 15:41), Sergey Senozhatsky wrote: > But the thing is different in case of dump_stack() + show_mem() + > some other output. Because now we ratelimit not a single printk() line, > but hundreds of them. The ratelimit becomes - 10 * $$$ lines in 5 seconds > (IOW, now we talk about thousands of lines). And on devices with slow serial consoles this can be somewhat close to "no ratelimit". *Suppose* that warn_alloc() adds 700 lines each time. Within 5 seconds we can call warn_alloc() 10 times, which will add 7000 lines to the logbuf. If printk() can evict only 6000 lines in 5 seconds then we have a growing number of pending logbuf messages. -ss
