bisecting fixing commit since f8788d86ab28f61f7b46eb6be375f8a726783636 building syzkaller on 59b57593586656c1d5be820aeed0e751087e6ac6 testing commit f8788d86ab28f61f7b46eb6be375f8a726783636 with gcc (GCC) 8.1.0 kernel signature: be5de52df7cd81282790fb99352d16fe5c8c28d41c394d1cbc37fc58edfc6393 all runs: crashed: general protection fault in ipvlan_hard_header testing current HEAD c85fb28b6f999db9928b841f63f1beeb3074eeca testing commit c85fb28b6f999db9928b841f63f1beeb3074eeca with gcc (GCC) 8.1.0 kernel signature: c01212cecc69c7c1da9b9307c8ca791098f9d5755969d1fefa2c5bb8fb14129b all runs: crashed: BUG: unable to handle kernel paging request in ipvlan_hard_header revisions tested: 2, total time: 18m58.411955866s (build: 11m39.134844787s, test: 6m6.72621212s) the crash still happens on HEAD commit msg: Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux 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 10c1ab067 P4D 10c1ab067 PUD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 1 PID: 8253 Comm: syz-executor.1 Not tainted 5.9.0-rc8-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:ffffc90000d08be0 EFLAGS: 00010246 RAX: ffffffff82243a00 RBX: ffff88810c1a4138 RCX: ffff88810c1a41a0 RDX: 00000000000086dd RSI: 00000000ffffffff RDI: ffff88812251e100 RBP: ffffc90000d08c10 R08: 0000000000000000 R09: 0000000000000060 R10: 0000000000000001 R11: 6f25d9049b473387 R12: ffff888116b55000 R13: ffff88812251e100 R14: ffff88810c1a4000 R15: 0000000000000000 FS: 00007f28d87fb700(0000) GS:ffff88812c100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000010000035f CR3: 000000010c1aa000 CR4: 00000000001506e0 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+0x39f/0xa00 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+0xa7/0x320 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers kernel/time/timer.c:1755 [inline] run_timer_softirq+0x218/0x5a0 kernel/time/timer.c:1768 __do_softirq+0xe9/0x558 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+0x77/0x90 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+0x128/0x130 kernel/softirq.c:195 local_bh_enable include/linux/bottom_half.h:32 [inline] get_next_corpse net/netfilter/nf_conntrack_core.c:2226 [inline] nf_ct_iterate_cleanup+0xf8/0x280 net/netfilter/nf_conntrack_core.c:2249 nf_ct_iterate_cleanup_net+0x6e/0xa0 net/netfilter/nf_conntrack_core.c:2334 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 kernel/notifier.c:361 [inline] raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:368 call_netdevice_notifiers_info+0x4b/0x80 net/core/dev.c:2033 call_netdevice_notifiers_extack net/core/dev.c:2045 [inline] call_netdevice_notifiers net/core/dev.c:2059 [inline] dev_close_many+0xe9/0x140 net/core/dev.c:1634 dev_close.part.106+0x61/0xa0 net/core/dev.c:1656 dev_close+0x13/0x20 net/core/dev.c:1651 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:5563 netlink_rcv_skb+0x47/0x110 net/netlink/af_netlink.c:2470 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:5581 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:00007f28d87fac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f28d87fb6d4 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 2d6c26251671419a ]--- 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:ffffc90000d08be0 EFLAGS: 00010246 RAX: ffffffff82243a00 RBX: ffff88810c1a4138 RCX: ffff88810c1a41a0 RDX: 00000000000086dd RSI: 00000000ffffffff RDI: ffff88812251e100 RBP: ffffc90000d08c10 R08: 0000000000000000 R09: 0000000000000060 R10: 0000000000000001 R11: 6f25d9049b473387 R12: ffff888116b55000 R13: ffff88812251e100 R14: ffff88810c1a4000 R15: 0000000000000000 FS: 00007f28d87fb700(0000) GS:ffff88812c100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000010000035f CR3: 000000010c1aa000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400