Arch Linux

Description:
When trying to use tc to add filters to any network device that is managed by NetworkManager the interface goes down. Dmesg shows:

[ 1684.445228] NetworkManager[2868]: segfault at 0 ip 00007f7bac9b8eb1 sp 00007ffc63b78068 error 4 in libc-2.26.so[7f7bac862000+1ae000]

The bug has been confirmed by others here:
https://github.com/magnific0/wondershaper/issues/16

Another user has provided the following stacktrace:

Thread 1 "NetworkManager" received signal SIGSEGV, Segmentation fault.
0x00007ffff5277496 in __strlen_sse2 () from /usr/lib/libc.so.6

heres the stacktrace of the failure :

#0 0x00007ffff5277496 in __strlen_sse2 () at /usr/lib/libc.so.6
#1 0x000055555563480a in ()
#2 0x0000555555642126 in ()
#3 0x00005555555bc577 in ()
#4 0x00007ffff675bcf4 in g_hash_table_lookup () at /usr/lib/libglib-2.0.so.0
#5 0x00005555555bcf4a in ()
#6 0x00005555555bd0d4 in ()
#7 0x00005555555bd497 in ()
#8 0x00005555556423f2 in ()
#9 0x00005555556447c9 in ()
#10 0x0000555555622c03 in ()
#11 0x000055555562419d in ()
#12 0x0000555555625131 in ()
#13 0x0000555555625381 in ()
#14 0x00007ffff677c0be in g_main_context_dispatch ()
at /usr/lib/libglib-2.0.so.0
#15 0x00007ffff677df69 in () at /usr/lib/libglib-2.0.so.0
#16 0x00007ffff677ef42 in g_main_loop_run () at /usr/lib/libglib-2.0.so.0
#17 0x000055555558036e in ()
#18 0x00007ffff5201f4a in __libc_start_main () at /usr/lib/libc.so.6
#19 0x00005555555809da in ()


Additional info:
* extra/networkmanager 1.10.2-1
* core/iproute2 4.14.1-2
* core/linux 4.14.12-1


Steps to reproduce:
1. Make sure interface is managed by NetworkManager. eth0 in example taken from: https://wiki.archlinux.org/index.php/advanced_traffic_control
2. Add qdisc
tc qdisc add dev eth0 root handle 1: htb default 30
3. Add filter
tc filter add dev eth0 protocol ip parent 1: prio 1 u32 match ip dport 22 0xffff flowid 1:10
4. Observe that NetworkManager has segfaulted:
dmesg