batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
kasan: GPF could be caused by NULL-ptr deref or user memory access
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
general protection fault: 0000 [#1] PREEMPT SMP KASAN
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
Modules linked in:
CPU: 1 PID: 7789 Comm: syz-executor.0 Not tainted 4.14.197-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888055792200 task.stack: ffff888055798000
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
RIP: 0010:__rb_erase_augmented include/linux/rbtree_augmented.h:167 [inline]
RIP: 0010:rb_erase+0x29/0x1290 lib/rbtree.c:459
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
RSP: 0018:ffff88805579fa68 EFLAGS: 00010292
RAX: dffffc0000000000 RBX: ffff888056c93270 RCX: ffffc90005cfb000
RDX: 0000000000000001 RSI: ffffffff8a67afa0 RDI: 0000000000000008
RBP: 0000000000000000 R08: ffffffff8a0b9788 R09: 00000000000403ed
R10: ffff888055792ab0 R11: ffff888055792200 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888056c9b338 R15: ffffffff8a67afa0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
FS:  00007f98db595700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005581e23ded48 CR3: 0000000097265000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 integrity_inode_free+0x119/0x300 security/integrity/iint.c:146
 security_inode_free+0x14/0x80 security/security.c:443
batman_adv: batadv0: Interface activated: batadv_slave_0
 __destroy_inode+0x1e8/0x4d0 fs/inode.c:238
 destroy_inode+0x49/0x110 fs/inode.c:265
 iput_final fs/inode.c:1524 [inline]
 iput+0x458/0x7e0 fs/inode.c:1551
IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready
 swap_inode_boot_loader fs/ext4/ioctl.c:197 [inline]
 ext4_ioctl+0x16c5/0x3870 fs/ext4/ioctl.c:924
IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_1
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
RIP: 0033:0x45d5b9
batman_adv: batadv0: Interface activated: batadv_slave_1
RSP: 002b:00007f98db594c78 EFLAGS: 00000246
IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready
 ORIG_RAX: 0000000000000010
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
RAX: ffffffffffffffda RBX: 000000000000dac0 RCX: 000000000045d5b9
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
RDX: 0000000000000000 RSI: 0000000000006611 RDI: 0000000000000003
RBP: 000000000118d018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cfec
R13: 00007ffcd3fb8baf R14: 00007f98db5959c0 R15: 000000000118cfec
Code: 
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
ff 
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
ff 48 b8 00 00 00 00 00 fc ff df 41 57 49 89 f7 41 
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
56 41 55 41 54 49 89 fc 48 83 c7 08 48 89 fa 55 
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
48 
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
c1 ea 03 53 48 83 ec 18 <80> 3c 02 00 0f 85 f2 0c 
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
00 
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0
00 
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
49 8d 7c 24 10 4d 8b 74 24 08 48 
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready
batman_adv: batadv0: Interface activated: batadv_slave_0
RIP: __rb_erase_augmented include/linux/rbtree_augmented.h:167 [inline] RSP: ffff88805579fa68
RIP: rb_erase+0x29/0x1290 lib/rbtree.c:459 RSP: ffff88805579fa68
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready
---[ end trace 4fe9a6517a94cdcc ]---