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Fri, 05 Apr 2019 00:00:34 -0700 (PDT) MIME-Version: 1.0 References: <000000000000e02450058593df62@google.com> <000000000000db3c59058595f0ac@google.com> In-Reply-To: <000000000000db3c59058595f0ac@google.com> From: Krzysztof Kozlowski Date: Fri, 5 Apr 2019 09:00:23 +0200 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: BUG: using __this_cpu_read() in preemptible code in ip6_finish_output To: syzbot Cc: alexander.h.duyck@intel.com, amritha.nambiar@intel.com, ast@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, davem@davemloft.net, ecree@solarflare.com, fw@strlen.de, idosch@mellanox.com, jiri@mellanox.com, kafai@fb.com, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, lirongqing@baidu.com, netdev@vger.kernel.org, petrm@mellanox.com, sd@queasysnail.net, songliubraving@fb.com, syzkaller-bugs@googlegroups.com, yhs@fb.com, yoshfuji@linux-ipv6.org Content-Type: text/plain; charset="UTF-8" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Wed, 3 Apr 2019 at 03:14, syzbot wrote: > > syzbot has bisected this bug to: > > commit 97cdcf37b57e3f204be3000b9eab9686f38b4356 > Author: Florian Westphal > Date: Mon Apr 1 14:42:13 2019 +0000 > > net: place xmit recursion in softnet data I am seeing this as well on ARMv7 board booted from NFS root (exynos_defconfig): [ 30.221238] BUG: using __this_cpu_read() in preemptible [00000000] code: systemd-network/236 [ 30.228576] caller is ip6_output+0x68/0x3e8 [ 30.232578] CPU: 1 PID: 236 Comm: systemd-network Not tainted 5.1.0-rc3-next-20190405 #2 [ 30.240657] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) [ 30.246719] [] (unwind_backtrace) from [] (show_stack+0x10/0x14) [ 30.254447] [] (show_stack) from [] (dump_stack+0x98/0xc4) [ 30.261638] [] (dump_stack) from [] (__this_cpu_preempt_check+0x124/0x128) [ 30.270238] [] (__this_cpu_preempt_check) from [] (ip6_output+0x68/0x3e8) [ 30.278730] [] (ip6_output) from [] (ip6_send_skb+0x30/0x1d0) [ 30.286180] [] (ip6_send_skb) from [] (rawv6_sendmsg+0x824/0x9c0) [ 30.294005] [] (rawv6_sendmsg) from [] (sock_sendmsg+0x14/0x24) [ 30.301628] [] (sock_sendmsg) from [] (___sys_sendmsg+0x230/0x244) [ 30.309514] [] (___sys_sendmsg) from [] (__sys_sendmsg+0x50/0x8c) [ 30.317316] [] (__sys_sendmsg) from [] (__sys_trace_return+0x0/0x14) [ 30.325376] Exception stack(0xe79f9fa8 to 0xe79f9ff0) [ 30.330377] 9fa0: 00000000 b6f3da58 0000000b beeb2a6c 00000000 00000000 [ 30.338560] 9fc0: 00000000 b6f3da58 004015ce 00000128 004b10c8 00000000 020d28f9 00000000 [ 30.346708] 9fe0: 004aeee0 beeb2a40 0047cbdc b6d27684 Full log: https://krzk.eu/#/builders/22/builds/1055/steps/13/logs/serial0 Best regards, Krzysztof Kozlowski