bisecting fixing commit since 7472c4028e2357202949f99ad94c5a5a34f95666 building syzkaller on fd2a5f28eb5e2b7c83b5e814f53e44e2a5dde24c testing commit 7472c4028e2357202949f99ad94c5a5a34f95666 with gcc (GCC) 8.1.0 kernel signature: e106a7bd3ce325fcc87cc2ec58bb78d4c9feaabac2a6593fbbaf44ad3171dd2b all runs: crashed: WARNING in ipvlan_unregister_nf_hook testing current HEAD 84920cc7fbe10e838689e8e1437dfd18d6e54a2c testing commit 84920cc7fbe10e838689e8e1437dfd18d6e54a2c with gcc (GCC) 8.1.0 kernel signature: b400ef445fa73d2f579a273aa23d1aaf0fd44c3990c341f9748a90864d125e63 all runs: crashed: WARNING in ipvlan_unregister_nf_hook revisions tested: 2, total time: 28m6.253668464s (build: 20m8.969714553s, test: 6m49.581172023s) the crash still happens on HEAD commit msg: Linux 4.19.121 crash: WARNING in ipvlan_unregister_nf_hook hsr_slave_0: Device is already in use. hsr_slave_1: Device is already in use. device hsr_slave_0 left promiscuous mode hsr_slave_0: Device is already in use. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 8641 at drivers/net/ipvlan/ipvlan_main.c:65 ipvlan_unregister_nf_hook.cold.26+0xc/0x16 drivers/net/ipvlan/ipvlan_main.c:65 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8641 Comm: syz-executor.4 Not tainted 4.19.121-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x123/0x177 lib/dump_stack.c:118 panic+0x1cd/0x375 kernel/panic.c:186 __warn.cold.8+0x1b/0x3e kernel/panic.c:541 report_bug+0x1a4/0x200 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1037 RIP: 0010:ipvlan_unregister_nf_hook.cold.26+0xc/0x16 drivers/net/ipvlan/ipvlan_main.c:65 Code: 77 fd e9 57 f8 ff ff e8 98 b1 77 fd e9 01 f9 ff ff 4c 89 f7 e8 6b b1 77 fd e9 55 f9 ff ff 48 c7 c7 c0 4e 8e 87 e8 f9 36 34 fd <0f> 0b e9 05 d8 ff ff 90 90 90 48 b8 00 00 00 00 00 fc ff df 48 89 RSP: 0018:ffff8880828def88 EFLAGS: 00010282 RAX: 0000000000000024 RBX: ffff88809e4cbf80 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff87677900 RDI: ffffffff8a183960 RBP: ffff8880828defa0 R08: ffffed1015d45079 R09: ffffed1015d45078 R10: ffffed1015d45078 R11: ffff8880aea283c7 R12: ffff8880969d8080 R13: ffff888097326dc0 R14: ffff888088b05548 R15: 0000000000000000 ipvlan_set_port_mode+0x43b/0x560 drivers/net/ipvlan/ipvlan_main.c:106 ipvlan_link_new+0x5b0/0xb20 drivers/net/ipvlan/ipvlan_main.c:676 rtnl_newlink+0xc78/0x1310 net/core/rtnetlink.c:3141 rtnetlink_rcv_msg+0x34f/0x8f0 net/core/rtnetlink.c:4777 netlink_rcv_skb+0x142/0x390 net/netlink/af_netlink.c:2455 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:4795 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x443/0x650 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x765/0xc40 net/netlink/af_netlink.c:1909 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:632 ___sys_sendmsg+0x647/0x950 net/socket.c:2115 __sys_sendmsg+0xd9/0x180 net/socket.c:2153 __do_sys_sendmsg net/socket.c:2162 [inline] __se_sys_sendmsg net/socket.c:2160 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2160 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c4a9 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f07ac585c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f07ac5866d4 RCX: 000000000045c4a9 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000005 RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009f9 R14: 00000000004cc766 R15: 000000000076bf2c Kernel Offset: disabled Rebooting in 86400 seconds..