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batman-adv checks in different situation if a new device is already on top
of a different batman-adv device. This is done by getting the iflink of a
device and all its parent. It assumes that this iflink is always a parent
device in an acyclic graph. But this assumption is broken by devices like
veth which are actually a pair of two devices linked to each other. The
recursive check would therefore get veth0 when calling dev_get_iflink on
veth1. And it gets veth0 when calling dev_get_iflink with veth1.
Creating a veth pair and loading batman-adv freezes parts of the system
ip link add veth0 type veth peer name veth1
modprobe batman-adv
An RCU stall will be detected on the system which cannot be fixed.
INFO: rcu_sched self-detected stall on CPU
1: (5264 ticks this GP) idle=3e9/140000000000001/0
softirq=144683/144686 fqs=5249
(t=5250 jiffies g=46 c=45 q=43)
Task dump for CPU 1:
insmod R running task 0 247 245 0x00000008
ffffffff8151f140 ffffffff8107888e ffff88000fd141c0 ffffffff8151f140
0000000000000000 ffffffff81552df0 ffffffff8107b420 0000000000000001
ffff88000e3fa700 ffffffff81540b00 ffffffff8107d667 0000000000000001
Call Trace:
<IRQ> [<ffffffff8107888e>] ? rcu_dump_cpu_stacks+0x7e/0xd0
[<ffffffff8107b420>] ? rcu_check_callbacks+0x3f0/0x6b0
[<ffffffff8107d667>] ? hrtimer_run_queues+0x47/0x180
[<ffffffff8107cf9d>] ? update_process_times+0x2d/0x50
[<ffffffff810873fb>] ? tick_handle_periodic+0x1b/0x60
[<ffffffff810290ae>] ? smp_trace_apic_timer_interrupt+0x5e/0x90
[<ffffffff813bbae2>] ? apic_timer_interrupt+0x82/0x90
<EOI> [<ffffffff812c3fd7>] ? __dev_get_by_index+0x37/0x40
[<ffffffffa0031f3e>] ? batadv_hard_if_event+0xee/0x3a0 [batman_adv]
[<ffffffff812c5801>] ? register_netdevice_notifier+0x81/0x1a0
[...]
This can be avoided by checking if two devices are each others parent and
stopping the check in this situation.
Fixes:
|
||
|---|---|---|
| .. | ||
| bat_algo.h | ||
| bat_iv_ogm.c | ||
| bitarray.c | ||
| bitarray.h | ||
| bridge_loop_avoidance.c | ||
| bridge_loop_avoidance.h | ||
| debugfs.c | ||
| debugfs.h | ||
| distributed-arp-table.c | ||
| distributed-arp-table.h | ||
| fragmentation.c | ||
| fragmentation.h | ||
| gateway_client.c | ||
| gateway_client.h | ||
| gateway_common.c | ||
| gateway_common.h | ||
| hard-interface.c | ||
| hard-interface.h | ||
| hash.c | ||
| hash.h | ||
| icmp_socket.c | ||
| icmp_socket.h | ||
| Kconfig | ||
| main.c | ||
| main.h | ||
| Makefile | ||
| multicast.c | ||
| multicast.h | ||
| network-coding.c | ||
| network-coding.h | ||
| originator.c | ||
| originator.h | ||
| packet.h | ||
| routing.c | ||
| routing.h | ||
| send.c | ||
| send.h | ||
| soft-interface.c | ||
| soft-interface.h | ||
| sysfs.c | ||
| sysfs.h | ||
| translation-table.c | ||
| translation-table.h | ||
| types.h | ||