IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready
Process accounting resumed
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready
------------[ cut here ]------------
IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready
kernel BUG at fs/fat/inode.c:161!
IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 9360 Comm: syz-executor.0 Not tainted 4.14.302-syzkaller #0
device veth0_macvtap entered promiscuous mode
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready
task: ffff88804c160500 task.stack: ffff88804c1b8000
RIP: 0010:__fat_get_block fs/fat/inode.c:161 [inline]
RIP: 0010:fat_get_block+0x647/0x750 fs/fat/inode.c:176
RSP: 0018:ffff88804c1bf5f0 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff88804dca3a80 RCX: ffffc90005c8a000
RDX: 000000000000a259 RSI: ffffffff81d001f7 RDI: ffff88804dca5ae8
RBP: ffff88804dca5ba0 R08: ffff88804c1bf688 R09: 0000000000000000
device veth1_macvtap entered promiscuous mode
R10: 0000000000000000 R11: ffff88804c160500 R12: ffff88804c2b0000
IPv6: ADDRCONF(NETDEV_UP): macsec0: link is not ready
R13: 0000000000000000 R14: 000000000000000b R15: 0000000000000001
FS:  00007fa07efed700(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc5a3aef000 CR3: 000000009f68a000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0
 __block_write_begin_int+0x35c/0x11d0 fs/buffer.c:2038
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_0
 __block_write_begin fs/buffer.c:2088 [inline]
 block_write_begin+0x58/0x270 fs/buffer.c:2147
 cont_write_begin+0x4a3/0x740 fs/buffer.c:2497
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 fat_write_begin+0x89/0x170 fs/fat/inode.c:222
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0
 generic_perform_write+0x1d5/0x430 mm/filemap.c:3055
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 __generic_file_write_iter+0x227/0x590 mm/filemap.c:3180
 generic_file_write_iter+0x36f/0x650 mm/filemap.c:3208
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0
 call_write_iter include/linux/fs.h:1780 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x44c/0x630 fs/read_write.c:482
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready
 __kernel_write+0xf5/0x330 fs/read_write.c:501
 do_acct_process+0xba6/0xfe0 kernel/acct.c:520
batman_adv: batadv0: Interface activated: batadv_slave_0
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1
 acct_pin_kill+0x27/0x100 kernel/acct.c:174
 pin_kill+0x14a/0x650 fs/fs_pin.c:50
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:3f) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
 SYSC_acct kernel/acct.c:291 [inline]
 SyS_acct+0x5e9/0x850 kernel/acct.c:273
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fa080a7b0c9
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
RSP: 002b:00007fa07efed168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a3
RAX: ffffffffffffffda RBX: 00007fa080b9af80 RCX: 00007fa080a7b0c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1
RBP: 00007fa080ad6ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda71acc8f R14: 00007fa07efed300 R15: 0000000000022000
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
Code: 19 
IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready
af ff e9 bd fa ff ff 
batman_adv: batadv0: Interface activated: batadv_slave_1
48 8b 7c 24 20 e8 82 18 af ff e9 f4 fb ff ff 48 8b 7c 24 38 e8 83 17 af ff e9 52 fe ff ff e8 49 58 85 ff <0f> 0b e8 42 58 85 ff 0f 0b e8 3b 19 af ff e9 b1 fa ff ff 48 8b 
RIP: __fat_get_block fs/fat/inode.c:161 [inline] RSP: ffff88804c1bf5f0
RIP: fat_get_block+0x647/0x750 fs/fat/inode.c:176 RSP: ffff88804c1bf5f0
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0
---[ end trace 7ddc3ce5663b2aed ]---