8021q: adding VLAN 0 to HW filter on device batadv0 kauditd_printk_skb: 3 callbacks suppressed audit: type=1400 audit(1546592293.799:31): lsm=SMACK fn=smack_socket_sock_rcv_skb action=denied subject="_" object="keyring" requested=w pid=8624 comm="syz-executor4" saddr=::1 src=20000 daddr=::1 dest=54218 netif=lo kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 8625 Comm: syz-executor4 Not tainted 4.20.0+ #8 kobject: 'loop2' (0000000074315c28): kobject_uevent_env Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:dev_net include/linux/netdevice.h:2169 [inline] RIP: 0010:icmp6_send+0x116/0x2d30 net/ipv6/icmp.c:426 Code: e8 03 42 80 3c 20 00 0f 85 95 26 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 63 10 49 8d bc 24 80 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 53 26 00 00 48 8d 8b b4 00 00 00 4d 8b bc 24 80 kobject: 'loop2' (0000000074315c28): fill_kobj_path: path = '/devices/virtual/block/loop2' RSP: 0018:ffff8880905ef340 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff888090850500 RCX: 0000000000000000 RDX: 00000000000000b0 RSI: ffffffff86d564cf RDI: 0000000000000580 RBP: ffff8880905ef5e0 R08: 0000000000000000 R09: ffffed1015cc5b90 R10: ffff8880905ef5f8 R11: ffff8880ae62dc7b R12: 0000000000000000 R13: ffff888090850500 R14: 0000000000000000 R15: 0000000000000001 FS: 00007f335502b700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000606ed8 CR3: 000000009db2a000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 kobject: 'loop5' (0000000081efd7ba): kobject_uevent_env Call Trace: kobject: 'loop5' (0000000081efd7ba): fill_kobj_path: path = '/devices/virtual/block/loop5' kobject: 'loop2' (0000000074315c28): kobject_uevent_env kobject: 'loop2' (0000000074315c28): fill_kobj_path: path = '/devices/virtual/block/loop2' ------------[ cut here ]------------ downgrading a read lock WARNING: CPU: 1 PID: 8651 at kernel/locking/lockdep.c:3553 __lock_downgrade kernel/locking/lockdep.c:3553 [inline] WARNING: CPU: 1 PID: 8651 at kernel/locking/lockdep.c:3553 lock_downgrade+0x4d2/0x910 kernel/locking/lockdep.c:3816