BUG: unable to handle page fault for address: ffff8880bfffd000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD f601067 P4D f601067 PUD 23ffff067 PMD 23fffe067 PTE 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 10220 Comm: syz-executor.2 Not tainted 5.14.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:do_csum+0xc8/0x2e0 arch/x86/lib/csum-partial_64.c:72 Code: 8b 17 83 e8 01 83 ee 04 48 83 c7 04 48 01 d3 89 c1 c1 e8 04 d1 e9 85 c0 0f 84 cd 01 00 00 48 c1 e0 06 31 d2 48 01 f8 48 03 1f <48> 13 5f 08 48 13 5f 10 48 13 5f 18 48 13 5f 20 48 13 5f 28 48 13 RSP: 0018:ffffc9000b367498 EFLAGS: 00010292 RAX: ffff8881163ae878 RBX: cf9a6c46502c8210 RCX: 000000001ffffffd RDX: 0000000000000000 RSI: ffffffffffffffec RDI: ffff8880bfffcff8 RBP: 0000000000000000 R08: 0000000000000008 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88801bbd6000 R13: ffff8880163ae8a4 R14: ffff8880163ae8b8 R15: ffff8880163ae8a4 FS: 00007f62bbbe5700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880bfffd000 CR3: 0000000026e06000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: csum_partial+0x8/0x10 arch/x86/lib/csum-partial_64.c:136 lco_csum include/linux/skbuff.h:4662 [inline] gre_build_header include/net/gre.h:139 [inline] __gre_xmit+0x7a0/0x940 net/ipv4/ip_gre.c:467 ipgre_xmit+0x5bf/0x790 net/ipv4/ip_gre.c:653 __netdev_start_xmit include/linux/netdevice.h:4944 [inline] netdev_start_xmit include/linux/netdevice.h:4958 [inline] xmit_one net/core/dev.c:3659 [inline] dev_hard_start_xmit+0x1a5/0x700 net/core/dev.c:3675 __dev_queue_xmit+0x212f/0x2de0 net/core/dev.c:4285 packet_snd net/packet/af_packet.c:3016 [inline] packet_sendmsg+0x1d16/0x48a0 net/packet/af_packet.c:3044 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xab/0xe0 net/socket.c:723 sock_no_sendpage+0xe7/0x120 net/core/sock.c:2959 kernel_sendpage.part.0+0x11e/0x240 net/socket.c:3673 kernel_sendpage net/socket.c:3670 [inline] sock_sendpage+0xc7/0x1a0 net/socket.c:1002 pipe_to_sendpage+0x245/0x410 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x362/0x810 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xba/0x120 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0x9ef/0x1b30 fs/splice.c:1079 __do_splice+0xf4/0x1b0 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x14a/0x200 fs/splice.c:1332 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f62bbbe5188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9 RDX: 0000000000000006 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00000000004bfcb9 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffcd52f278f R14: 00007f62bbbe5300 R15: 0000000000022000 Modules linked in: CR2: ffff8880bfffd000 ---[ end trace 64b20a91b5ed22e3 ]--- RIP: 0010:do_csum+0xc8/0x2e0 arch/x86/lib/csum-partial_64.c:72 Code: 8b 17 83 e8 01 83 ee 04 48 83 c7 04 48 01 d3 89 c1 c1 e8 04 d1 e9 85 c0 0f 84 cd 01 00 00 48 c1 e0 06 31 d2 48 01 f8 48 03 1f <48> 13 5f 08 48 13 5f 10 48 13 5f 18 48 13 5f 20 48 13 5f 28 48 13 RSP: 0018:ffffc9000b367498 EFLAGS: 00010292 RAX: ffff8881163ae878 RBX: cf9a6c46502c8210 RCX: 000000001ffffffd RDX: 0000000000000000 RSI: ffffffffffffffec RDI: ffff8880bfffcff8 RBP: 0000000000000000 R08: 0000000000000008 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88801bbd6000 R13: ffff8880163ae8a4 R14: ffff8880163ae8b8 R15: ffff8880163ae8a4 FS: 00007f62bbbe5700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880bfffd000 CR3: 0000000026e06000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 8b 17 mov (%rdi),%edx 2: 83 e8 01 sub $0x1,%eax 5: 83 ee 04 sub $0x4,%esi 8: 48 83 c7 04 add $0x4,%rdi c: 48 01 d3 add %rdx,%rbx f: 89 c1 mov %eax,%ecx 11: c1 e8 04 shr $0x4,%eax 14: d1 e9 shr %ecx 16: 85 c0 test %eax,%eax 18: 0f 84 cd 01 00 00 je 0x1eb 1e: 48 c1 e0 06 shl $0x6,%rax 22: 31 d2 xor %edx,%edx 24: 48 01 f8 add %rdi,%rax 27: 48 03 1f add (%rdi),%rbx 2a: 48 13 5f 08 adc 0x8(%rdi),%rbx <-- trapping instruction 2e: 48 13 5f 10 adc 0x10(%rdi),%rbx 32: 48 13 5f 18 adc 0x18(%rdi),%rbx 36: 48 13 5f 20 adc 0x20(%rdi),%rbx 3a: 48 13 5f 28 adc 0x28(%rdi),%rbx 3e: 48 rex.W 3f: 13 .byte 0x13