[REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero

From	Oleksandr Natalenko <oleksandr@natalenko.name>
Newsgroups	linux.kernel
Subject	[REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero
Date	2015-12-21 21:40 +0100
Message-ID	<qIfpn-2P6-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Commit 3759824da87b30ce7a35b4873b62b0ba38905ef5 (tcp: PRR uses CRB mode by 
default and SS mode conditionally) introduced changes to net/ipv4/tcp_input.c 
tcp_cwnd_reduction() that, possibly, cause division by zero, and therefore, 
kernel panic in interrupt handler [1].

Reverting 3759824da87b30ce7a35b4873b62b0ba38905ef5 seems to fix the issue.

I'm able to reproduce the issue on 4.3.0–4.3.3 once per several day 
(occasionally).

What could be done to help in debugging this issue?

Regards,
  Oleksandr.

[1] http://i.piccy.info/
i9/6f5cb187c4ff282d189f78c63f95af43/1450729403/283985/951663/panic.jpg
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[REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero Oleksandr Natalenko <oleksandr@natalenko.name> - 2015-12-21 21:40 +0100
  Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible)  division by zero Yuchung Cheng <ycheng@google.com> - 2015-12-22 03:20 +0100
    Re: [REGRESSION] tcp/ipv4: kernel panic because of (possible) division by zero Oleksandr Natalenko <oleksandr@natalenko.name> - 2015-12-22 21:20 +0100

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