netdev - Re: random crashes, kdump and so on

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Date:   Tue, 9 Apr 2019 04:22:52 +0200
From:   Reindl Harald <h.reindl@...lounge.net>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: random crashes, kdump and so on



Am 25.03.19 um 23:10 schrieb Reindl Harald:
>>> fact is that around 4.19.x the kernel had a ton of issues starting with
>>> conncount broken over months (again: with a simple method get the
>>> stacktrace it would have been easily discovered), the scheduler issue in
>>> 4.19.x eating peoples data and so on
>>
>> If kexec-tools doesn't work for you, try something else like netconsole
>> to save the stack traces. Again, depends on the type of crash, just stack
>> trace may not even be enough to debugging it. Of course, having a
>> stack trace is still much better than having nothing.
> 
> for now it looks that the tonights 5.0.4 F29 build works without the
> random crashes, kdump this time also didn't refuse to start and
> /var/crash is now a dedicated virtual disk with 3 GB
> 
> fingers crossing, after the last days this looks good at fierst sight,
> on the oher hand there where days up to weeks with no panic, so god knows

after two weeks and 27 Mio. accepted connections 5.0.4 crashed too

"vmcore-dmesg" piped through "sort | uniq" is reduced to 399 lines
containing just rate-limited "-j LOG" iptables events and nothing else
repeatet 32487 times until the dedicated virtual disk was full

what a mess.....

-rw------- 1 harry verwaltung    0 2019-04-09 03:01 vmcore-incomplete
-rw-r----- 1 harry verwaltung  93K 2019-04-09 03:09 filtered.txt
-rw-r----- 1 harry verwaltung 2,9G 2019-04-09 03:01
vmcore-dmesg-incomplete.txt

cat vmcore-dmesg-incomplete.txt | grep "1248098\.543887" | wc -l
32487