bisecting fixing commit since f8788d86ab28f61f7b46eb6be375f8a726783636 building syzkaller on 59b57593586656c1d5be820aeed0e751087e6ac6 testing commit f8788d86ab28f61f7b46eb6be375f8a726783636 with gcc (GCC) 8.1.0 kernel signature: 26d6ed08feba1b81c7c225d5435aebc7f0b3263fb28736d5827e18efdbf0183c all runs: crashed: general protection fault in ipvlan_hard_header testing current HEAD 0477e92881850d44910a7e94fc2c46f96faa131f testing commit 0477e92881850d44910a7e94fc2c46f96faa131f with gcc (GCC) 8.1.0 kernel signature: 432439bb7bed5fd1b634aa8d265db3801b1e927f77f255de2656df5c1c7b0afb all runs: crashed: BUG: unable to handle kernel paging request in ipvlan_hard_header revisions tested: 2, total time: 18m34.154517854s (build: 11m32.562711678s, test: 5m55.685808791s) the crash still happens on HEAD commit msg: Linux 5.10-rc7 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 118fc8067 P4D 118fc8067 PUD 0 Oops: 0000 [#1] PREEMPT SMP CPU: 0 PID: 7427 Comm: syz-executor.0 Not tainted 5.10.0-rc7-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: ffffffff82226a50 RBX: 0000000000000000 RCX: ffff888119d305a8 RDX: 00000000000086dd RSI: 00000000ffffffff RDI: ffff88810b9cdf00 RBP: ffffc90000003c20 R08: 0000000000000000 R09: 0000000000000060 R10: 00000000000069b1 R11: 0000000000000001 R12: ffff888119d30400 R13: ffff88810b9cdf00 R14: ffff888116ca1000 R15: ffff888119d30538 FS: 00007fc3fbd9c700(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000010000035f CR3: 0000000118fc9000 CR4: 0000000000350ef0 Call Trace: neigh_output include/net/neighbour.h:510 [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 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0xef/0x120 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x5d/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:should_resched arch/x86/include/asm/preempt.h:102 [inline] RIP: 0010:__local_bh_enable_ip+0xbf/0x150 kernel/softirq.c:202 Code: 00 ff ff 00 74 7a bf 01 00 00 00 e8 8b 01 03 00 e8 76 e3 10 00 48 83 3d a6 35 0f 03 00 0f 84 96 00 00 00 fb 66 0f 1f 44 00 00 <65> 8b 05 ba f0 e3 7e 85 c0 75 05 e8 38 b8 e2 ff 5b 41 5c 5d c3 65 RSP: 0018:ffffc900023a32f8 EFLAGS: 00000282 RAX: 0000000000032de7 RBX: 0000000000000200 RCX: 0000000000000006 RDX: 0000000000000000 RSI: ffffffff83f2ad63 RDI: ffffffff83f67aae RBP: ffffc900023a3308 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000002996 R11: 0000000000000001 R12: ffffffff829ade43 R13: ffff88810aed6e40 R14: 000000000001945b R15: ffffffff829ac4b0 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:00007fc3fbd9bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fc3fbd9c6d4 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 63015d48d9330723 ]--- 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: ffffffff82226a50 RBX: 0000000000000000 RCX: ffff888119d305a8 RDX: 00000000000086dd RSI: 00000000ffffffff RDI: ffff88810b9cdf00 RBP: ffffc90000003c20 R08: 0000000000000000 R09: 0000000000000060 R10: 00000000000069b1 R11: 0000000000000001 R12: ffff888119d30400 R13: ffff88810b9cdf00 R14: ffff888116ca1000 R15: ffff888119d30538 FS: 00007fc3fbd9c700(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000010000035f CR3: 0000000118fc9000 CR4: 0000000000350ef0