bisecting fixing commit since 14b58326976de6ef3998eefec1dd7f8b38b97a75 building syzkaller on 7adc7b652ac0426d2f2006dda89a021bb1747e7f testing commit 14b58326976de6ef3998eefec1dd7f8b38b97a75 with gcc (GCC) 8.1.0 kernel signature: f3cc846264be146d4741f18fc99068cfbf706adee283f18d4912dd72d0e1dd4e all runs: crashed: INFO: trying to register non-static key in skb_dequeue testing current HEAD bae31eef2a167ef160ab2703b6a2f5bbecd98d92 testing commit bae31eef2a167ef160ab2703b6a2f5bbecd98d92 with gcc (GCC) 8.1.0 kernel signature: 2aa1b004f3feaa24459b3f45ffee7c90ecc1bced52d4010250cf81a214450af5 all runs: crashed: INFO: trying to register non-static key in skb_dequeue revisions tested: 2, total time: 24m40.411803863s (build: 17m46.137340454s, test: 6m2.349904811s) the crash still happens on HEAD commit msg: Linux 4.14.200 crash: INFO: trying to register non-static key in skb_dequeue IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes 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 IPv6: ADDRCONF(NETDEV_UP): veth1_to_batadv: link is not ready INFO: trying to register non-static key. the code is fine but needs lockdep annotation. turning off the locking correctness validator. CPU: 0 PID: 7804 Comm: syz-executor.2 Not tainted 4.14.200-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x14b/0x1f1 lib/dump_stack.c:58 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 register_lock_class+0x3bd/0x19a0 kernel/locking/lockdep.c:768 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! __lock_acquire+0x18b/0x42d0 kernel/locking/lockdep.c:3378 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 lock_acquire+0x17e/0x3e0 kernel/locking/lockdep.c:3998 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:160 skb_dequeue+0x20/0x1f0 net/core/skbuff.c:2816 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 skb_queue_purge+0x1a/0x30 net/core/skbuff.c:2854 l2cap_chan_del+0x4c6/0x790 net/bluetooth/l2cap_core.c:637 l2cap_chan_close+0x338/0x7e0 net/bluetooth/l2cap_core.c:757 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! l2cap_sock_shutdown+0x7ab/0xbb0 net/bluetooth/l2cap_sock.c:1160 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 l2cap_sock_release+0x60/0x230 net/bluetooth/l2cap_sock.c:1203 __sock_release+0xc2/0x2a0 net/socket.c:602 sock_close+0x10/0x20 net/socket.c:1139 __fput+0x232/0x740 fs/file_table.c:210 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! ____fput+0x9/0x10 fs/file_table.c:244 task_work_run+0xe5/0x170 kernel/task_work.c:113 batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3d) already exists on: batadv_slave_0 get_signal+0x1460/0x1ab0 kernel/signal.c:2234 do_signal+0x7f/0x18b0 arch/x86/kernel/signal.c:814 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! exit_to_usermode_loop+0x11e/0x190 arch/x86/entry/common.c:160 IPv6: ADDRCONF(NETDEV_UP): batadv_slave_0: link is not ready prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x416/0x5b0 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45ce69 RSP: 002b:00007fa325ae6c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 0000000000002100 RCX: 000000000045ce69 RDX: 000000000000000e RSI: 0000000020000040 RDI: 0000000000000004 RBP: 000000000118c000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bfcc R13: 00007ffc0f353e7f R14: 00007fa325ae79c0 R15: 000000000118bfcc batman_adv: batadv0: Interface activated: batadv_slave_0 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 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 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 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 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 batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems! IPv6: ADDRCONF(NETDEV_UP): batadv_slave_1: link is not ready batman_adv: batadv0: Interface activated: batadv_slave_1 IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready Bluetooth: hci0 command 0x0409 tx timeout Bluetooth: hci1 command 0x0409 tx timeout Bluetooth: hci3 command 0x0409 tx timeout Bluetooth: hci2 command 0x0409 tx timeout Bluetooth: hci0 command 0x041b tx timeout Bluetooth: hci5 command 0x0409 tx timeout Bluetooth: hci4 command 0x0409 tx timeout Bluetooth: hci1 command 0x041b tx timeout Bluetooth: hci2 command 0x041b tx timeout Bluetooth: hci3 command 0x041b tx timeout Bluetooth: hci4 command 0x041b tx timeout Bluetooth: hci5 command 0x041b tx timeout Bluetooth: hci0 command 0x040f tx timeout Bluetooth: hci1 command 0x040f tx timeout Bluetooth: hci3 command 0x040f tx timeout Bluetooth: hci2 command 0x040f tx timeout Bluetooth: hci0 command 0x0419 tx timeout Bluetooth: hci5 command 0x040f tx timeout Bluetooth: hci4 command 0x040f tx timeout Bluetooth: hci1 command 0x0419 tx timeout