Messages in this thread | | | From | Sergey Senozhatsky <> | Date | Fri, 10 Apr 2020 12:07:04 +0900 | Subject | Re: [PATCHv2] printk: queue wake_up_klogd irq_work only if per-CPU areas are ready |
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On (20/04/09 12:25), Simon Kirby wrote: > This causes "dmesg -w" or "cat /dev/kmsg" to not print new messages after > dumping the current ring. I hit this on v5.5.9, v5.5.15, v5.6.3, and > Linus HEAD. This prints no "hi": > > (sleep 1;echo hi > /dev/kmsg)& dmesg -w > > ...curiously, "strace dmesg -w" shows the data received once ^C is hit. > > Jann pointed me to this patch. Applying it or reverting 1b710b1b10eff9d4 > does fix it for me. However, Linus HEAD is still broken and, AFAICS, > remains unreverted and unfixed in stable/linux-5.4.y through linux-5.6.y. > It was introduced in 5.6 but backported to those, not just the LTS above.
I'm trying to land this patch. Give me a moment, I'll come back to you shortly.
-ss
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