linux-kernel - Re: UBSAN: Undefined behaviour in net/ipv4/fib_trie.c:1397:22 and UBSAN: Undefined behaviour in ./arch/x86/include/asm/atomic.h:156:2

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Message-ID: <1453844178.11327.40.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 26 Jan 2016 13:36:18 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Toralf Förster <toralf.foerster@....de>,
	Alexander Duyck <alexander.duyck@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: UBSAN: Undefined behaviour in net/ipv4/fib_trie.c:1397:22 and
 UBSAN: Undefined behaviour in ./arch/x86/include/asm/atomic.h:156:2

On Tue, 2016-01-26 at 20:45 +0100, Toralf Förster wrote:
> at a 32 nbit KVM image of a Gentoo Linux runniogn v4.5-rc1 - attached is /var/log/messages
> 

Jan 26 20:40:04 n22kvm-clone kernel: ================================================================================
Jan 26 20:40:04 n22kvm-clone kernel: UBSAN: Undefined behaviour in net/ipv4/fib_trie.c:1397:22
Jan 26 20:40:04 n22kvm-clone kernel: shift exponent 32 is too large for 32-bit type 'long unsigned int'
Jan 26 20:40:04 n22kvm-clone kernel: CPU: 1 PID: 2050 Comm: dhcpcd Not tainted 4.5.0-rc1 #1
Jan 26 20:40:04 n22kvm-clone kernel: Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.8.2-0-g33fbe13 by qemu-project.org 04/01/2014

Thanks for the report.

CC netdev and Alexander

Commit 79e5ad2ceb006
("fib_trie: Remove leaf_info ")