bisecting fixing commit since f8788d86ab28f61f7b46eb6be375f8a726783636 building syzkaller on 59b57593586656c1d5be820aeed0e751087e6ac6 testing commit f8788d86ab28f61f7b46eb6be375f8a726783636 with gcc (GCC) 8.1.0 kernel signature: 332f303c1d1bc134085889d8e037e75e1f4dc40b40ae60c122ea54530782b703 run #0: crashed: general protection fault in ipvlan_hard_header run #1: crashed: general protection fault in ipvlan_hard_header run #2: crashed: general protection fault in ipvlan_hard_header run #3: crashed: general protection fault in ipvlan_hard_header run #4: crashed: general protection fault in ipvlan_hard_header run #5: crashed: general protection fault in ipvlan_hard_header run #6: crashed: general protection fault in ipvlan_hard_header run #7: crashed: general protection fault in ipvlan_hard_header run #8: crashed: general protection fault in ipvlan_hard_header run #9: boot failed: can't ssh into the instance testing current HEAD 659caaf65dc9c7150aa3e80225ec6e66b25ab3ce testing commit 659caaf65dc9c7150aa3e80225ec6e66b25ab3ce with gcc (GCC) 8.1.0 kernel signature: 8e7eb798703c5a0d92ee4d89fd9a26e7ef9d428037fdea03b133eaebbf5fa5db all runs: crashed: BUG: unable to handle kernel paging request in ipvlan_hard_header revisions tested: 2, total time: 25m22.035059162s (build: 11m20.81353978s, test: 12m55.679968004s) the crash still happens on HEAD commit msg: Merge tag 'ceph-for-5.10-rc3' of git://github.com/ceph/ceph-client crash: BUG: unable to handle kernel paging request in ipvlan_hard_header BUG: unable to handle page fault for address: 000000010000035f #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 121561067 P4D 121561067 PUD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 0 PID: 8255 Comm: syz-executor.2 Not tainted 5.10.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ipvlan_hard_header+0x2e/0x40 drivers/net/ipvlan/ipvlan_main.c:378 Code: 8b b6 20 0c 00 00 74 22 48 8b 86 10 02 00 00 48 85 c0 74 13 48 8b 00 48 85 c0 74 0b 55 0f b7 d2 48 89 e5 ff d0 5d c3 31 c0 c3 <4c> 8b 86 60 03 00 00 eb d5 66 0f 1f 84 00 00 00 00 00 8b 87 68 0c RSP: 0018:ffffc90000003bf0 EFLAGS: 00010246 RAX: ffffffff822201a0 RBX: 0000000000000000 RCX: ffff8881214d35a8 RDX: 00000000000086dd RSI: 00000000ffffffff RDI: ffff88810cf64900 RBP: ffffc90000003c20 R08: 0000000000000000 R09: 0000000000000060 R10: 00000000000070d6 R11: 0000000000000001 R12: ffff8881214d3538 R13: ffff88811e94f000 R14: ffff88810cf64900 R15: ffff8881214d3400 FS: 00007f6384b76700(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000010000035f CR3: 0000000121560000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x3aa/0x9f0 net/ipv6/ip6_output.c:117 __ip6_finish_output+0xd6/0x240 net/ipv6/ip6_output.c:143 ip6_finish_output+0x27/0xa0 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip6_output+0x7d/0x2b0 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] mld_sendpack+0x2b5/0x380 net/ipv6/mcast.c:1679 mld_send_cr net/ipv6/mcast.c:1975 [inline] mld_ifc_timer_expire+0x1c1/0x350 net/ipv6/mcast.c:2474 call_timer_fn+0xa5/0x300 kernel/time/timer.c:1410 expire_timers kernel/time/timer.c:1455 [inline] __run_timers kernel/time/timer.c:1747 [inline] run_timer_softirq+0x218/0x580 kernel/time/timer.c:1760 __do_softirq+0xeb/0x52a kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x82/0xa0 arch/x86/kernel/irq_64.c:77 do_softirq.part.16+0x9d/0xc0 kernel/softirq.c:343 do_softirq kernel/softirq.c:335 [inline] __local_bh_enable_ip+0x149/0x150 kernel/softirq.c:195 local_bh_enable include/linux/bottom_half.h:32 [inline] get_next_corpse net/netfilter/nf_conntrack_core.c:2221 [inline] nf_ct_iterate_cleanup+0x100/0x270 net/netfilter/nf_conntrack_core.c:2244 nf_ct_iterate_cleanup_net+0x6e/0xa0 net/netfilter/nf_conntrack_core.c:2329 masq_device_event+0x2f/0x40 net/netfilter/nf_nat_masquerade.c:88 notifier_call_chain+0x34/0x90 kernel/notifier.c:83 raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:410 call_netdevice_notifiers_info+0x4b/0x80 net/core/dev.c:2035 call_netdevice_notifiers_extack net/core/dev.c:2047 [inline] call_netdevice_notifiers net/core/dev.c:2061 [inline] dev_close_many+0xe9/0x140 net/core/dev.c:1636 dev_close.part.112+0x61/0xa0 net/core/dev.c:1658 dev_close+0x13/0x20 net/core/dev.c:1653 team_port_add drivers/net/team/team.c:1305 [inline] team_add_slave+0x4ad/0x690 drivers/net/team/team.c:1967 do_set_master+0x84/0xa0 net/core/rtnetlink.c:2517 do_setlink+0x329/0x1060 net/core/rtnetlink.c:2713 __rtnl_newlink+0x579/0x9a0 net/core/rtnetlink.c:3374 rtnl_newlink+0x43/0x70 net/core/rtnetlink.c:3500 rtnetlink_rcv_msg+0x171/0x480 net/core/rtnetlink.c:5562 netlink_rcv_skb+0x4f/0x100 net/netlink/af_netlink.c:2494 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:5580 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x1a0/0x270 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x256/0x480 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0x33/0x40 net/socket.c:671 ____sys_sendmsg+0x1fc/0x240 net/socket.c:2353 ___sys_sendmsg+0x77/0xb0 net/socket.c:2407 __sys_sendmsg+0x5d/0xb0 net/socket.c:2440 __do_sys_sendmsg net/socket.c:2449 [inline] __se_sys_sendmsg net/socket.c:2447 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2447 do_syscall_64+0x31/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c4c9 Code: 2d 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f6384b75c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f6384b766d4 RCX: 000000000045c4c9 RDX: 0000000000000000 RSI: 0000000020001640 RDI: 0000000000000006 RBP: 000000000076c060 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009f2 R14: 00000000004cc707 R15: 000000000076c06c Modules linked in: CR2: 000000010000035f ---[ end trace bb27f7a98b3263c4 ]--- RIP: 0010:ipvlan_hard_header+0x2e/0x40 drivers/net/ipvlan/ipvlan_main.c:378 Code: 8b b6 20 0c 00 00 74 22 48 8b 86 10 02 00 00 48 85 c0 74 13 48 8b 00 48 85 c0 74 0b 55 0f b7 d2 48 89 e5 ff d0 5d c3 31 c0 c3 <4c> 8b 86 60 03 00 00 eb d5 66 0f 1f 84 00 00 00 00 00 8b 87 68 0c RSP: 0018:ffffc90000003bf0 EFLAGS: 00010246 RAX: ffffffff822201a0 RBX: 0000000000000000 RCX: ffff8881214d35a8 RDX: 00000000000086dd RSI: 00000000ffffffff RDI: ffff88810cf64900 RBP: ffffc90000003c20 R08: 0000000000000000 R09: 0000000000000060 R10: 00000000000070d6 R11: 0000000000000001 R12: ffff8881214d3538 R13: ffff88811e94f000 R14: ffff88810cf64900 R15: ffff8881214d3400 FS: 00007f6384b76700(0000) GS:ffff88813bc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000010000035f CR3: 0000000121560000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400