kasan: CONFIG_KASAN_INLINE enabled batman_adv: batadv0: Interface activated: batadv_slave_1 kasan: GPF could be caused by NULL-ptr deref or user memory access IPv6: ADDRCONF(NETDEV_UP): macvlan1: link is not ready IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready general protection fault: 0000 [#1] PREEMPT SMP KASAN IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready Modules linked in: IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready CPU: 1 PID: 384 Comm: kworker/u4:3 Not tainted 4.14.307-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Workqueue: writeback wb_workfn (flush-7:3) task: ffff8880b48a6580 task.stack: ffff8880b48a8000 RIP: 0010:lbmStartIO+0x14a/0x490 fs/jfs/jfs_logmgr.c:2143 RSP: 0018:ffff8880b48af800 EFLAGS: 00010202 IPv6: ADDRCONF(NETDEV_UP): veth0_macvtap: link is not ready RAX: dffffc0000000000 RBX: ffff88809bf79600 RCX: 0000000000000003 IPv6: ADDRCONF(NETDEV_UP): veth1_macvtap: link is not ready RDX: 000000000000001c RSI: 0000000000000000 RDI: 00000000000000e0 RBP: ffff8880af1d65c0 R08: 0000000000000001 R09: ffff8880af1d65c0 R10: ffff8880af1d6647 R11: 0000000000000000 R12: ffff8880b36fb680 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fee73313000 CR3: 00000000aee67000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: device veth0_macvtap entered promiscuous mode lbmWrite+0x254/0x380 fs/jfs/jfs_logmgr.c:2092 lmGCwrite+0x3d4/0x4d0 fs/jfs/jfs_logmgr.c:806 jfs_flush_journal.part.0+0x3e6/0x600 fs/jfs/jfs_logmgr.c:1570 IPv6: ADDRCONF(NETDEV_UP): macvtap0: link is not ready device veth1_macvtap entered promiscuous mode IPv6: ADDRCONF(NETDEV_UP): macsec0: link is not ready IPv6: ADDRCONF(NETDEV_UP): veth0_to_batadv: link is not ready jfs_flush_journal+0x23/0x30 fs/jfs/jfs_logmgr.c:1537 jfs_write_inode+0x13c/0x190 fs/jfs/inode.c:140 write_inode fs/fs-writeback.c:1241 [inline] __writeback_single_inode+0x6a4/0x1010 fs/fs-writeback.c:1439 writeback_sb_inodes+0x48b/0xd30 fs/fs-writeback.c:1645 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 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 wb_writeback+0x243/0xb80 fs/fs-writeback.c:1820 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 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! wb_do_writeback fs/fs-writeback.c:1952 [inline] wb_workfn+0x2bd/0xf50 fs/fs-writeback.c:1988 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0 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 batman_adv: batadv0: Interface activated: batadv_slave_0 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 Code: 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:3f) already exists on: batadv_slave_1 c1 ea 03 80 3c 02 00 0f 85 06 03 00 00 48 b8 00 00 00 00 00 fc ff df 4d 8b 6c 24 20 49 8d bd e0 00 00 00 48 89 fa batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! 48 c1 ea 03 <80> 3c 02 00 0f 85 d5 02 00 00 4d 8b ad e0 00 00 00 4d 39 ee 74 RIP: lbmStartIO+0x14a/0x490 fs/jfs/jfs_logmgr.c:2143 RSP: ffff8880b48af800 ---[ end trace 087f99713f418219 ]--- batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1