bisecting fixing commit since f8788d86ab28f61f7b46eb6be375f8a726783636 building syzkaller on 59b57593586656c1d5be820aeed0e751087e6ac6 testing commit f8788d86ab28f61f7b46eb6be375f8a726783636 with gcc (GCC) 8.1.0 kernel signature: 5fbcda1e8c7b8e2a7fd719b41fb56809e558c5174a455d2313721692454e5a51 all runs: crashed: general protection fault in ipvlan_hard_header testing current HEAD 06a81c1c7db9bd5de0bd38cd5acc44bb22b99150 testing commit 06a81c1c7db9bd5de0bd38cd5acc44bb22b99150 with gcc (GCC) 8.1.0 kernel signature: 000b5fc183e8b4cc0dd2b8a4d4c26f53dda2b6c0b561f2f075f9527aa8139bc2 all runs: crashed: BUG: unable to handle kernel paging request in ipvlan_hard_header revisions tested: 2, total time: 18m25.40176325s (build: 11m10.526820111s, test: 6m10.579380803s) 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: 000000010000034f #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 10cae2067 P4D 10cae2067 PUD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 1 PID: 8252 Comm: syz-executor.1 Not tainted 5.8.0-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:360 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 50 03 00 00 eb d5 66 0f 1f 84 00 00 00 00 00 8b 87 68 0c RSP: 0018:ffffc90000d08be0 EFLAGS: 00010246 RAX: ffffffff82235940 RBX: ffff88811f5a4900 RCX: ffff888121bec9a0 RDX: 00000000000086dd RSI: 00000000ffffffff RDI: ffff88811f5a4900 RBP: ffffc90000d08c10 R08: 0000000000000000 R09: 0000000000000060 R10: 0000000000000001 R11: 229b4b35e8865661 R12: ffff88810e000000 R13: ffff888121bec938 R14: ffff888121bec800 R15: 0000000000000000 FS: 00007f2b41efb700(0000) GS:ffff88812c100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000010000034f CR3: 000000010cb24000 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+0x3a9/0x9e0 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_initial_cr.part.33+0x84/0xa0 net/ipv6/mcast.c:2096 mld_send_initial_cr net/ipv6/mcast.c:2080 [inline] mld_dad_timer_expire+0x22/0xb0 net/ipv6/mcast.c:2115 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+0xf1/0x508 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x79/0x90 arch/x86/kernel/irq_64.c:77 do_softirq.part.15+0x9a/0xb0 kernel/softirq.c:343 do_softirq kernel/softirq.c:335 [inline] __local_bh_enable_ip+0xf5/0x100 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+0x102/0x260 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.101+0x61/0xa0 net/core/dev.c:1656 dev_close+0x13/0x20 net/core/dev.c:1651 __bond_release_one.cold.92+0x22d/0x373 drivers/net/bonding/bond_main.c:2168 bond_release+0xd/0x10 drivers/net/bonding/bond_main.c:2195 do_set_master+0x40/0xa0 net/core/rtnetlink.c:2503 do_setlink+0x329/0x1060 net/core/rtnetlink.c:2713 rtnl_group_changelink net/core/rtnetlink.c:3225 [inline] __rtnl_newlink+0x464/0x9a0 net/core/rtnetlink.c:3379 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:2359 ___sys_sendmsg+0x77/0xb0 net/socket.c:2413 __sys_sendmsg+0x5d/0xb0 net/socket.c:2446 __do_sys_sendmsg net/socket.c:2455 [inline] __se_sys_sendmsg net/socket.c:2453 [inline] __x64_sys_sendmsg+0x1a/0x20 net/socket.c:2453 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:00007f2b41efac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f2b41efb6d4 RCX: 000000000045c4c9 RDX: 0000000000000084 RSI: 0000000020000140 RDI: 0000000000000005 RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009f9 R14: 00000000004cc77a R15: 000000000076bfcc Modules linked in: CR2: 000000010000034f ---[ end trace 9163ca5a554ec8de ]--- RIP: 0010:ipvlan_hard_header+0x2e/0x40 drivers/net/ipvlan/ipvlan_main.c:360 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 50 03 00 00 eb d5 66 0f 1f 84 00 00 00 00 00 8b 87 68 0c RSP: 0018:ffffc90000d08be0 EFLAGS: 00010246 RAX: ffffffff82235940 RBX: ffff88811f5a4900 RCX: ffff888121bec9a0 RDX: 00000000000086dd RSI: 00000000ffffffff RDI: ffff88811f5a4900 RBP: ffffc90000d08c10 R08: 0000000000000000 R09: 0000000000000060 R10: 0000000000000001 R11: 229b4b35e8865661 R12: ffff88810e000000 R13: ffff888121bec938 R14: ffff888121bec800 R15: 0000000000000000 FS: 00007f2b41efb700(0000) GS:ffff88812c100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000010000034f CR3: 000000010cb24000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400