bisecting fixing commit since f8788d86ab28f61f7b46eb6be375f8a726783636 building syzkaller on 59b57593586656c1d5be820aeed0e751087e6ac6 testing commit f8788d86ab28f61f7b46eb6be375f8a726783636 with gcc (GCC) 8.1.0 kernel signature: 4358157a2a94f821e0f629f68a25881539a46f343e00064c0e671c37467c6481 all runs: crashed: general protection fault in ipvlan_hard_header testing current HEAD ae83d0b416db002fe95601e7f97f64b59514d936 testing commit ae83d0b416db002fe95601e7f97f64b59514d936 with gcc (GCC) 8.1.0 kernel signature: dede28992829c7d48f1c0a9b98617aacc51fac8158ad23c1c0dec10500995cbf 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 revisions tested: 2, total time: 29m13.404317248s (build: 13m33.447926733s, test: 15m8.950450755s) the crash still happens on HEAD commit msg: Linux 5.7-rc2 crash: general protection fault in ipvlan_hard_header general protection fault, probably for non-canonical address 0xdffffc0020000069: 0000 [#1] PREEMPT SMP KASAN KASAN: probably user-memory-access in range [0x0000000100000348-0x000000010000034f] CPU: 1 PID: 8611 Comm: syz-executor.1 Not tainted 5.7.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ipvlan_hard_header+0xbf/0x1a0 drivers/net/ipvlan/ipvlan_main.c:358 Code: c4 20 5b 41 5c 5d c3 48 83 c4 20 31 c0 5b 41 5c 5d c3 48 8d be 50 03 00 00 48 b8 00 00 00 00 00 fc ff df 49 89 f8 49 c1 e8 03 <41> 80 3c 00 00 0f 85 9f 00 00 00 4c 8b 86 50 03 00 00 e9 67 ff ff RSP: 0018:ffffc90000da8790 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff88809889b138 RCX: ffff88809889b1a0 RDX: 00000000000086dd RSI: 00000000ffffffff RDI: 000000010000034f RBP: ffffc90000da87c0 R08: 0000000020000069 R09: 0000000000000038 R10: 1ffff110124c9984 R11: 0000000000000000 R12: ffff88809448aac0 R13: ffff88809889b130 R14: ffff88809448aac0 R15: ffff88809889b000 FS: 00007ff98990d700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fae2edfa000 CR3: 00000000a812f000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: dev_hard_header include/linux/netdevice.h:2997 [inline] neigh_resolve_output+0x452/0x800 net/core/neighbour.c:1484 neigh_output include/net/neighbour.h:510 [inline] ip6_finish_output2+0xcc4/0x2340 net/ipv6/ip6_output.c:117 __ip6_finish_output+0x36c/0x930 net/ipv6/ip6_output.c:143 ip6_finish_output+0x27/0x170 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x1e4/0x750 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:435 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ndisc_send_skb+0xcac/0x12a0 net/ipv6/ndisc.c:506 ndisc_send_rs+0x116/0x620 net/ipv6/ndisc.c:700 addrconf_rs_timer+0x25c/0x600 net/ipv6/addrconf.c:3889 call_timer_fn+0x171/0x580 kernel/time/timer.c:1405 expire_timers kernel/time/timer.c:1450 [inline] __run_timers kernel/time/timer.c:1774 [inline] run_timer_softirq+0xd58/0x1330 kernel/time/timer.c:1787 __do_softirq+0x262/0xa02 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19a/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x1a6/0x5f0 arch/x86/kernel/apic/apic.c:1140 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline] RIP: 0010:console_unlock+0x8a1/0xbd0 kernel/printk/printk.c:2506 Code: 60 69 14 89 48 89 f8 48 c1 e8 03 42 80 3c 38 00 0f 85 fa 01 00 00 48 83 3d 3b e2 bd 07 00 0f 84 0a 01 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 e9 b6 f8 ff ff 49 8d 7e 08 48 89 f8 48 c1 e8 03 42 RSP: 0018:ffffc90004c96e60 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1228d2c RBX: 0000000000000200 RCX: 0000000000000006 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000282 RBP: ffffc90004c96ed8 R08: 0000000000000006 R09: fffffbfff154bd35 R10: ffffffff8aa5e9a7 R11: fffffbfff154bd34 R12: 0000000000000000 R13: ffffffff8992cf08 R14: 0000000000000000 R15: dffffc0000000000 vprintk_emit+0x19a/0x560 kernel/printk/printk.c:2021 vprintk_default+0x1a/0x20 kernel/printk/printk.c:2048 vprintk_func+0x49/0x12c kernel/printk/printk_safe.c:385 printk+0x9a/0xc0 kernel/printk/printk.c:2081 validate_nla lib/nlattr.c:178 [inline] __nla_validate_parse.cold.8+0x58/0x81 lib/nlattr.c:381 __nla_parse+0x22/0x30 lib/nlattr.c:478 __nlmsg_parse include/net/netlink.h:666 [inline] nlmsg_parse_deprecated include/net/netlink.h:706 [inline] __rtnl_newlink+0x1ca/0x1480 net/core/rtnetlink.c:3149 rtnl_newlink+0x61/0x90 net/core/rtnetlink.c:3391 rtnetlink_rcv_msg+0x34a/0x8d0 net/core/rtnetlink.c:5454 netlink_rcv_skb+0x13c/0x380 net/netlink/af_netlink.c:2469 rtnetlink_rcv+0x10/0x20 net/core/rtnetlink.c:5472 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x474/0x6c0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x7ab/0xd50 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xb5/0xf0 net/socket.c:672 ____sys_sendmsg+0x609/0x950 net/socket.c:2362 ___sys_sendmsg+0xe4/0x160 net/socket.c:2416 __sys_sendmsg+0xd9/0x180 net/socket.c:2449 __do_sys_sendmsg net/socket.c:2458 [inline] __se_sys_sendmsg net/socket.c:2456 [inline] __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2456 do_syscall_64+0xca/0x630 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c449 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:00007ff98990cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ff98990d6d4 RCX: 000000000045c449 RDX: 0000000000000000 RSI: 0000000020001640 RDI: 0000000000000006 RBP: 000000000076c060 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000009f2 R14: 00000000004cc687 R15: 000000000076c06c Modules linked in: ---[ end trace 2c7964b31e9c194b ]--- RIP: 0010:ipvlan_hard_header+0xbf/0x1a0 drivers/net/ipvlan/ipvlan_main.c:358 Code: c4 20 5b 41 5c 5d c3 48 83 c4 20 31 c0 5b 41 5c 5d c3 48 8d be 50 03 00 00 48 b8 00 00 00 00 00 fc ff df 49 89 f8 49 c1 e8 03 <41> 80 3c 00 00 0f 85 9f 00 00 00 4c 8b 86 50 03 00 00 e9 67 ff ff RSP: 0018:ffffc90000da8790 EFLAGS: 00010207 RAX: dffffc0000000000 RBX: ffff88809889b138 RCX: ffff88809889b1a0 RDX: 00000000000086dd RSI: 00000000ffffffff RDI: 000000010000034f RBP: ffffc90000da87c0 R08: 0000000020000069 R09: 0000000000000038 R10: 1ffff110124c9984 R11: 0000000000000000 R12: ffff88809448aac0 R13: ffff88809889b130 R14: ffff88809448aac0 R15: ffff88809889b000 FS: 00007ff98990d700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fae2edfa000 CR3: 00000000a812f000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400