BUG: unable to handle page fault for address: ffff8880bfffd000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD fe01067 P4D fe01067 PUD 23ffff067 PMD 23fffe067 PTE 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 31248 Comm: syz-executor.1 Not tainted 5.11.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:do_csum+0x177/0x400 arch/x86/lib/csum-partial_64.c:72 Code: 89 ee 44 89 6c 24 04 89 04 24 e8 34 e2 96 fd 45 85 ed 74 4e 4d 89 e6 e8 a7 da 96 fd 41 83 ed 01 31 ff 31 c0 44 89 ee 49 03 1e <49> 13 5e 08 49 13 5e 10 49 13 5e 18 49 13 5e 20 49 13 5e 28 49 13 RSP: 0018:ffffc900097df638 EFLAGS: 00010282 RAX: 0000000000000000 RBX: f86e9c4c57d7ebce RCX: ffffc9000a7cd000 RDX: 0000000000040000 RSI: 0000000001838041 RDI: 0000000000000000 RBP: 00000000ffffffec R08: 0000000000000000 R09: 0000000000000060 R10: ffffffff83dbee0b R11: 0000000000000060 R12: ffff888020dfe0b8 R13: 0000000001838041 R14: ffff8880bfffcff8 R15: 0000000000000000 FS: 00007f79a762d700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880bfffd000 CR3: 000000001c26c000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: csum_partial+0x1c/0x30 arch/x86/lib/csum-partial_64.c:136 lco_csum include/linux/skbuff.h:4594 [inline] gre_checksum include/net/gre.h:114 [inline] gre_build_header include/net/gre.h:149 [inline] __gre_xmit+0x867/0x8f0 net/ipv4/ip_gre.c:462 ipgre_xmit+0x679/0x830 net/ipv4/ip_gre.c:648 __netdev_start_xmit include/linux/netdevice.h:4758 [inline] netdev_start_xmit include/linux/netdevice.h:4772 [inline] xmit_one net/core/dev.c:3574 [inline] dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3590 __dev_queue_xmit+0x21db/0x2dd0 net/core/dev.c:4151 packet_snd net/packet/af_packet.c:3006 [inline] packet_sendmsg+0x2406/0x52a0 net/packet/af_packet.c:3031 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 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 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f79a762cc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000000080 RSI: 0000000020000440 RDI: 0000000000000003 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fff6dd14c3f R14: 00007f79a762d9c0 R15: 000000000119bf8c Modules linked in: CR2: ffff8880bfffd000 ---[ end trace fb2046d902b852b8 ]--- RIP: 0010:do_csum+0x177/0x400 arch/x86/lib/csum-partial_64.c:72 Code: 89 ee 44 89 6c 24 04 89 04 24 e8 34 e2 96 fd 45 85 ed 74 4e 4d 89 e6 e8 a7 da 96 fd 41 83 ed 01 31 ff 31 c0 44 89 ee 49 03 1e <49> 13 5e 08 49 13 5e 10 49 13 5e 18 49 13 5e 20 49 13 5e 28 49 13 RSP: 0018:ffffc900097df638 EFLAGS: 00010282 RAX: 0000000000000000 RBX: f86e9c4c57d7ebce RCX: ffffc9000a7cd000 RDX: 0000000000040000 RSI: 0000000001838041 RDI: 0000000000000000 RBP: 00000000ffffffec R08: 0000000000000000 R09: 0000000000000060 R10: ffffffff83dbee0b R11: 0000000000000060 R12: ffff888020dfe0b8 R13: 0000000001838041 R14: ffff8880bfffcff8 R15: 0000000000000000 FS: 00007f79a762d700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880bfffd000 CR3: 000000001c26c000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400