BUG: unable to handle page fault for address: ffff8880bfffd000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD fc01067 P4D fc01067 PUD 23ffff067 PMD 23fffe067 PTE 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8691 Comm: syz-executor957 Not tainted 5.10.0-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 04 14 9a fd 45 85 ed 74 4e 4d 89 e6 e8 77 0c 9a 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:ffffc90001dff420 EFLAGS: 00010296 RAX: 0000000000000000 RBX: e87b8fb6a788da1b RCX: 0000000000000000 RDX: ffff888010ef9bc0 RSI: 00000000016ea4e1 RDI: 0000000000000000 RBP: 00000000ffffffec R08: 0000000000000000 R09: 0000000000000060 R10: ffffffff83d7506b R11: 0000000000000060 R12: ffff88801ba908b8 R13: 00000000016ea4e1 R14: ffff8880bfffcff8 R15: 0000000000000000 FS: 00007f56fd0c3700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880bfffd000 CR3: 00000000206f6000 CR4: 00000000001506e0 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:4584 [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:4776 [inline] netdev_start_xmit include/linux/netdevice.h:4790 [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+0x2413/0x52b0 net/packet/af_packet.c:3031 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 sock_no_sendpage+0xee/0x130 net/core/sock.c:2846 kernel_sendpage.part.0+0x1ab/0x350 net/socket.c:3636 kernel_sendpage net/socket.c:3633 [inline] sock_sendpage+0xe5/0x140 net/socket.c:945 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x439/0x8a0 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:743 do_splice_from fs/splice.c:764 [inline] do_splice+0xba4/0x1a90 fs/splice.c:1059 __do_splice+0x134/0x250 fs/splice.c:1137 __do_sys_splice fs/splice.c:1343 [inline] __se_sys_splice fs/splice.c:1325 [inline] __x64_sys_splice+0x198/0x250 fs/splice.c:1325 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x448dc9 Code: e8 ac 12 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 1b 0c fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f56fd0c2d88 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00000000006dec78 RCX: 0000000000448dc9 RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000006dec70 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dec7c R13: 00316c6e747a7973 R14: 0000000000000000 R15: 0000000030657267 Modules linked in: CR2: ffff8880bfffd000 ---[ end trace 5a003039afae783b ]--- 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 04 14 9a fd 45 85 ed 74 4e 4d 89 e6 e8 77 0c 9a 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:ffffc90001dff420 EFLAGS: 00010296 RAX: 0000000000000000 RBX: e87b8fb6a788da1b RCX: 0000000000000000 RDX: ffff888010ef9bc0 RSI: 00000000016ea4e1 RDI: 0000000000000000 RBP: 00000000ffffffec R08: 0000000000000000 R09: 0000000000000060 R10: ffffffff83d7506b R11: 0000000000000060 R12: ffff88801ba908b8 R13: 00000000016ea4e1 R14: ffff8880bfffcff8 R15: 0000000000000000 FS: 00007f56fd0c3700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880bfffd000 CR3: 00000000206f6000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400