B.A.T.M.A.N May 2020

b.a.t.m.a.n@lists.open-mesh.org

14 participants
22 discussions

INFO: rcu detected stall in netlink_sendmsg (4)
by syzbot 24 Jul '20

24 Jul '20

Hello, syzbot found the following crash on: HEAD commit: ae661dec Merge branch 'ifla_xdp_expected_fd' git tree: bpf-next console output: https://syzkaller.appspot.com/x/log.txt?x=12245647e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=b5acf5ac38a50651 dashboard link: https://syzkaller.appspot.com/bug?extid=0fb70e87d8e0ac278fe9 compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+0fb70e87d8e0ac278fe9(a)syzkaller.appspotmail.com rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=5c2/1/0x4000000000000002 softirq=376075/376076 fqs=5176 (t=10500 jiffies g=506061 q=176208) NMI backtrace for cpu 0 CPU: 0 PID: 17281 Comm: syz-executor.5 Not tainted 5.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x169/0x1b3 kernel/rcu/tree_stall.h:254 print_cpu_stall kernel/rcu/tree_stall.h:475 [inline] check_cpu_stall kernel/rcu/tree_stall.h:549 [inline] rcu_pending kernel/rcu/tree.c:3030 [inline] rcu_sched_clock_irq.cold+0x518/0xc55 kernel/rcu/tree.c:2276 update_process_times+0x25/0x60 kernel/time/timer.c:1726 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:171 tick_sched_timer+0x4e/0x140 kernel/time/tick-sched.c:1314 __run_hrtimer kernel/time/hrtimer.c:1517 [inline] __hrtimer_run_queues+0x32c/0xdd0 kernel/time/hrtimer.c:1579 hrtimer_interrupt+0x312/0x770 kernel/time/hrtimer.c:1641 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline] smp_apic_timer_interrupt+0x15b/0x600 arch/x86/kernel/apic/apic.c:1144 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 </IRQ> RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline] RIP: 0010:lock_release+0x45f/0x7c0 kernel/locking/lockdep.c:4505 Code: 94 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 d0 02 00 00 48 83 3d 6d 1d 1b 08 00 0f 84 71 01 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00 RSP: 0018:ffffc90003d9ec30 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff12e7698 RBX: 1ffff920007b3d89 RCX: 1ffff110098769b9 RDX: dffffc0000000000 RSI: 1ffff110098769c5 RDI: 0000000000000282 RBP: ffff88804c3b4540 R08: 0000000000000004 R09: fffffbfff14cc269 R10: fffffbfff14cc268 R11: ffffffff8a661347 R12: bc95c6993a9665e0 R13: ffffffff87a36fb1 R14: ffff88804c3b4dd0 R15: 0000000000000003 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:174 [inline] _raw_spin_unlock_bh+0x12/0x30 kernel/locking/spinlock.c:207 spin_unlock_bh include/linux/spinlock.h:383 [inline] batadv_tt_local_purge_pending_clients+0x2a1/0x3b0 net/batman-adv/translation-table.c:3914 batadv_tt_local_resize_to_mtu+0x96/0x130 net/batman-adv/translation-table.c:4198 batadv_update_min_mtu net/batman-adv/hard-interface.c:626 [inline] batadv_hardif_activate_interface.part.0.cold+0xc6/0x294 net/batman-adv/hard-interface.c:653 batadv_hardif_activate_interface net/batman-adv/hard-interface.c:800 [inline] batadv_hardif_enable_interface+0x9f2/0xaa0 net/batman-adv/hard-interface.c:792 batadv_softif_slave_add+0x92/0x150 net/batman-adv/soft-interface.c:859 do_set_master net/core/rtnetlink.c:2470 [inline] do_set_master+0x1d7/0x230 net/core/rtnetlink.c:2443 do_setlink+0xaa2/0x3680 net/core/rtnetlink.c:2605 __rtnl_newlink+0xad5/0x1590 net/core/rtnetlink.c:3266 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3391 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5454 netlink_rcv_skb+0x15a/0x410 net/netlink/af_netlink.c:2478 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x537/0x740 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x882/0xe10 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6b9/0x7d0 net/socket.c:2343 ___sys_sendmsg+0x100/0x170 net/socket.c:2397 __sys_sendmsg+0xec/0x1b0 net/socket.c:2430 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c849 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f043b72fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f043b7306d4 RCX: 000000000045c849 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009f5 R14: 00000000004ccac9 R15: 000000000076bf0c --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller(a)googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

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Network stops passing traffic randomly
by smartwires＠gmail.com 03 Jun '20

03 Jun '20

I have been battling a weird problem recently, I have this problem occurring on two (2) separate networks, one with 2 nodes and the other with 3 nodes. What happens is the network is fine and all of a sudden the clients can not reach the Internet, This what I have observed. on both Openwrt 19.07, 18.07. A reboot of the gateway corrects the problem. 1. Gateway is up and running and able the reach the internet. 2. batctl o show the neighbor/s 3. batctl ping [MAC] fails root@Main-GW:~# batctl o [B.A.T.M.A.N. adv openwrt-2018.1-5, MainIF/MAC: mesh0/e8:5b:b7:00:10:73 (bat0/22:55:4d:3e:5f:8f BATMAN_IV)] Originator last-seen (#/255) Nexthop [outgoingIF] * e8:5b:b7:00:10:6b 0.880s (255) e8:5b:b7:00:10:6b [ mesh0] root@Main-GW:~# batctl ping e8:5b:b7:00:10:6b PING e8:5b:b7:00:10:6b (e8:5b:b7:00:10:6b) 20(48) bytes of data Reply from host e8:5b:b7:00:10:6b timed out Reply from host e8:5b:b7:00:10:6b timed out Reply from host e8:5b:b7:00:10:6b timed out Reply from host e8:5b:b7:00:10:6b timed out

4 18

QoS over batman-adv
by Xuebing Wang 29 May '20

29 May '20

Hi Simon and community, We have been using batman-adv on OpenWRT 15.05 + ath9k chips for over 3 years and it works great. We are exploring the idea of QoS over batman-adv to transmit small quantity of high priority data. Any suggestions? Thanks. Xuebing Wang

2 2

Re: Network stops passing traffic randomly
by Sven Eckelmann 28 May '20

28 May '20

[please don't send me private mails about batman-adv - unless you have a really good reason to do so. And if not stated otherwise, I must assume that you actually wanted to send you message to the mailing list] On Thursday, 28 May 2020 21:18:36 CEST Steve Newcomb wrote: > > My first guess is that the underlying interfaces (mesh0) stopped to transport > > unicast frames. Did you check this by setting an IP on mesh0 and ping between > > these devices using the IPv4 ping? > Not sure what the phrase "to set an IP on mesh0" means, if not simply to > endow the corresponding bridge with a static IP. Which is what I'm doing. > > Not sure what "IPv4 ping" means. I've disabled IPv6, so I'm not using > anything but IPv4. I am assuming that mesh0 is the device which was added to bat0 as slave. Please replace this with whatever you are using # on device 1 ip addr add 192.168.23.1/24 dev mesh0 # on device 2 ip addr add 192.168.23.2/24 dev mesh0 > If "IPv4 ping" means "the ordinary Linux ping command", then, yes, I've > tried that. The IPv4 ping was just a placeholder for "not batman-adv ping packets". So you can also use ICMPv6 if you prefer. Just make sure to send it over the underlying ("slave") interface of batman-adv. And not on bat0 or any higher layer bridge/vlan/... interface. With the addresses mentioned earlier: # on device 1 ping 192.168.23.2 # on device 2 ping 192.168.23.1 And also observe with tcpdump what is received by the other end. > 100% packet loss when the offline condition occurs. Batctl > o, on the other hand, looks just fine. Sounds to me like "mesh0" is still able to transport broadcast frames (which are used for the OGMs - which "create" the originator lists in `batctl o`). And if you cannot send unicast frames anymore on mesh0 then something is wrong with the unicast part. For example, when you are using encryption for the mesh0 link, maybe the group key is still set correctly but something happened with the pairwise key and it is now "corrupted". Kind regards, Sven

2 1

[PATCH] alfred: Switch mailing list subscription page
by Sven Eckelmann 27 May '20

27 May '20

The mailman installation on lists.open-mesh.org was switched from mailman2 to mailman3. The URL to the subscription webpage changed in this process. Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- README.rst | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.rst b/README.rst index d7446a3..76664ee 100644 --- a/README.rst +++ b/README.rst @@ -329,7 +329,7 @@ IRC: #batman on irc.freenode.org Mailing-list: b.a.t.m.a.n(a)open-mesh.org (optional subscription at - https://lists.open-mesh.org/mm/listinfo/b.a.t.m.a.n) + https://lists.open-mesh.org/mailman3/postorius/lists/b.a.t.m.a.n.lists.open…) If you have test reports/patches/ideas, please read the wiki for further instruction on how to contribute: -- 2.20.1

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[PATCH] batman-adv: Switch mailing list subscription page
by Sven Eckelmann 27 May '20

27 May '20

The mailman installation on lists.open-mesh.org was switched from mailman2 to mailman3. The URL to the subscription webpage changed in this process. Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- Documentation/networking/batman-adv.rst | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Documentation/networking/batman-adv.rst b/Documentation/networking/batman-adv.rst index 18020943..02af49b0 100644 --- a/Documentation/networking/batman-adv.rst +++ b/Documentation/networking/batman-adv.rst @@ -160,7 +160,7 @@ IRC: #batman on irc.freenode.org Mailing-list: b.a.t.m.a.n(a)open-mesh.org (optional subscription at - https://lists.open-mesh.org/mm/listinfo/b.a.t.m.a.n) + https://lists.open-mesh.org/mailman3/postorius/lists/b.a.t.m.a.n.lists.open…) You can also contact the Authors: -- 2.20.1

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[PATCH 0/3] pull request for net-next: batman-adv 2020-05-26
by Simon Wunderlich 26 May '20

26 May '20

Hi David, here is a small cleanup pull request of batman-adv to go into net-next. Please pull or let me know of any problem! Thank you, Simon The following changes since commit 1a33e10e4a95cb109ff1145098175df3113313ef: net: partially revert dynamic lockdep key changes (2020-05-04 12:05:56 -0700) are available in the Git repository at: git://git.open-mesh.org/linux-merge.git tags/batadv-next-for-davem-20200526 for you to fetch changes up to 9ad346c90509ebd983f60da7d082f261ad329507: batman-adv: Revert "disable ethtool link speed detection when auto negotiation off" (2020-05-26 09:23:33 +0200) ---------------------------------------------------------------- This cleanup patchset includes the following patches: - Fix revert dynamic lockdep key changes for batman-adv, by Sven Eckelmann - use rcu_replace_pointer() where appropriate, by Antonio Quartulli - Revert "disable ethtool link speed detection when auto negotiation off", by Sven Eckelmann ---------------------------------------------------------------- Antonio Quartulli (1): batman-adv: use rcu_replace_pointer() where appropriate Sven Eckelmann (2): batman-adv: Revert "Drop lockdep.h include for soft-interface.c" batman-adv: Revert "disable ethtool link speed detection when auto negotiation off" net/batman-adv/bat_v_elp.c | 15 +-------------- net/batman-adv/gateway_client.c | 4 ++-- net/batman-adv/hard-interface.c | 4 ++-- net/batman-adv/routing.c | 4 ++-- net/batman-adv/soft-interface.c | 1 + 5 files changed, 8 insertions(+), 20 deletions(-)

2 4

Batman-adv packet retranslation
by Alexey Ermakov 25 May '20

25 May '20

Hi, All. There is a problem with retranslating packets in B.A.T.M.A.N. V mode. I have 3 stations, st1, st2 and st3 with one active network interface. This interface is configured so that st1 and st3 can see only st2. I expect that if I join these stations in a bat0 network, then station 2 will act as a repeater and all three stations will be visible in the bat0 network. This works fine if I selecting B.A.T.M.A.N. IV algorithm, but doesn't work in B.A.T.M.A.N.V. -- Ermakov Alexey.

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Re: Network stops passing traffic randomly
by Sven Eckelmann 25 May '20

25 May '20

On Monday, 25 May 2020 15:19:22 CEST Daniel Ghansah wrote: > [B.A.T.M.A.N. adv openwrt-2018.1-5, MainIF/MAC: mesh0/e8:5b:b7:00:10:73 Just noticed another thing - why is your revision of batman-adv so low? The OpenWrt 18.06.x version of batman-adv is already at 2018.1-11. Kind regards, Sven

1 0

Re: Network stops passing traffic randomly
by Sven Eckelmann 25 May '20

25 May '20

On Monday, 25 May 2020 15:19:22 CEST Daniel Ghansah wrote: > Hi Sven, > Yes I did ping via the IP, there is no response, I am using IPV4 Ok, when your underlying layer (mesh0) is not working then you should not expect batman-adv to work. Btw. the `batctl dc` output doesn't look like your tested the IPv4 ping on mesh0 but on bat0 - not what I've asked for. Kind regards, Sven

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B.A.T.M.A.N May 2020