IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready
==================================================================
BUG: KASAN: null-ptr-deref in memset include/linux/string.h:333 [inline]
BUG: KASAN: null-ptr-deref in choke_reset+0x208/0x340 net/sched/sch_choke.c:330
Write of size 8 at addr 0000000000000000 by task syz-executor.0/25335

CPU: 0 PID: 25335 Comm: syz-executor.0 Not tainted 4.19.121-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x188/0x20d lib/dump_stack.c:118
 kasan_report_error mm/kasan/report.c:352 [inline]
 kasan_report mm/kasan/report.c:412 [inline]
 kasan_report.cold+0x194/0x2b9 mm/kasan/report.c:396
 memset+0x20/0x40 mm/kasan/kasan.c:285
 memset include/linux/string.h:333 [inline]
 choke_reset+0x208/0x340 net/sched/sch_choke.c:330
 qdisc_reset+0x6b/0x4c0 net/sched/sch_generic.c:933
 dev_deactivate_queue.constprop.0+0x138/0x220 net/sched/sch_generic.c:1132
 netdev_for_each_tx_queue include/linux/netdevice.h:2107 [inline]
 dev_deactivate_many+0xe2/0xb30 net/sched/sch_generic.c:1189
 dev_deactivate+0xfe/0x1d0 net/sched/sch_generic.c:1222
 dev_qdisc_change_tx_queue_len+0x213/0x2f0 net/sched/sch_generic.c:1245
 dev_change_tx_queue_len+0x190/0x1d0 net/core/dev.c:7853
 do_setlink+0xa6e/0x3510 net/core/rtnetlink.c:2471
 rtnl_group_changelink net/core/rtnetlink.c:2925 [inline]
 rtnl_newlink+0xc7e/0x1440 net/core/rtnetlink.c:3083
 rtnetlink_rcv_msg+0x453/0xaf0 net/core/rtnetlink.c:4777
 netlink_rcv_skb+0x160/0x410 net/netlink/af_netlink.c:2455
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x4d7/0x6a0 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x80b/0xcd0 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:622 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:632
 ___sys_sendmsg+0x803/0x920 net/socket.c:2115
 __sys_sendmsg+0xec/0x1b0 net/socket.c:2153
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c829
Code: 0d b7 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 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbbe7729c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000500ce0 RCX: 000000000045c829
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000006
RBP: 000000000078c040 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000a04 R14: 00000000004ccbcc R15: 00007fbbe772a6d4
==================================================================