BUG: unable to handle page fault for address: ffff8880bfffd000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 10601067 P4D 10601067 PUD 23ffff067 PMD 23fffe067 PTE 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 22599 Comm: syz-executor.4 Not tainted 5.14.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:do_csum+0x17f/0x400 arch/x86/lib/csum-partial_64.c:72 Code: 04 24 e8 04 b8 80 fd 45 85 ed 74 4e 4d 89 e6 e8 b7 b0 80 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 5e 30 49 13 5e 38 48 11 RSP: 0018:ffffc9000207f420 EFLAGS: 00010286 RAX: 0000000000000000 RBX: c8a4c7169a055b48 RCX: ffffc9001278e000 RDX: 0000000000040000 RSI: 00000000018447e2 RDI: 0000000000000000 RBP: 00000000ffffffec R08: 0000000000000000 R09: 0000000000000060 R10: ffffffff83f4f87b R11: 0000000000000060 R12: ffff88802111c8e8 R13: 00000000018447e2 R14: ffff8880bfffcfe8 R15: 0000000000000000 FS: 00007f6ad258f700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880bfffd000 CR3: 000000008ea9a000 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:4662 [inline] gre_build_header include/net/gre.h:139 [inline] __gre_xmit+0x879/0x970 net/ipv4/ip_gre.c:467 ipgre_xmit+0x679/0x830 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+0x1eb/0x920 net/core/dev.c:3675 __dev_queue_xmit+0x2988/0x3620 net/core/dev.c:4285 packet_snd net/packet/af_packet.c:3016 [inline] packet_sendmsg+0x22fc/0x52b0 net/packet/af_packet.c:3044 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 sock_no_sendpage+0xf3/0x130 net/core/sock.c:2959 kernel_sendpage.part.0+0x1a0/0x340 net/socket.c:3673 kernel_sendpage net/socket.c:3670 [inline] sock_sendpage+0xe5/0x140 net/socket.c:1002 pipe_to_sendpage+0x2ad/0x380 fs/splice.c:364 splice_from_pipe_feed fs/splice.c:418 [inline] __splice_from_pipe+0x43e/0x8a0 fs/splice.c:562 splice_from_pipe fs/splice.c:597 [inline] generic_splice_sendpage+0xd4/0x140 fs/splice.c:746 do_splice_from fs/splice.c:767 [inline] do_splice+0xb7e/0x1960 fs/splice.c:1079 __do_splice+0x134/0x250 fs/splice.c:1144 __do_sys_splice fs/splice.c:1350 [inline] __se_sys_splice fs/splice.c:1332 [inline] __x64_sys_splice+0x198/0x250 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: 0033:0x4665e9 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:00007f6ad258f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665e9 RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 00000000ffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007fff7e884d6f R14: 00007f6ad258f300 R15: 0000000000022000 Modules linked in: CR2: ffff8880bfffd000 ---[ end trace ca94b8051d736303 ]--- RIP: 0010:do_csum+0x17f/0x400 arch/x86/lib/csum-partial_64.c:72 Code: 04 24 e8 04 b8 80 fd 45 85 ed 74 4e 4d 89 e6 e8 b7 b0 80 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 5e 30 49 13 5e 38 48 11 RSP: 0018:ffffc9000207f420 EFLAGS: 00010286 RAX: 0000000000000000 RBX: c8a4c7169a055b48 RCX: ffffc9001278e000 RDX: 0000000000040000 RSI: 00000000018447e2 RDI: 0000000000000000 RBP: 00000000ffffffec R08: 0000000000000000 R09: 0000000000000060 R10: ffffffff83f4f87b R11: 0000000000000060 R12: ffff88802111c8e8 R13: 00000000018447e2 R14: ffff8880bfffcfe8 R15: 0000000000000000 FS: 00007f6ad258f700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff8880bfffd000 CR3: 000000008ea9a000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 04 24 add $0x24,%al 2: e8 04 b8 80 fd callq 0xfd80b80b 7: 45 85 ed test %r13d,%r13d a: 74 4e je 0x5a c: 4d 89 e6 mov %r12,%r14 f: e8 b7 b0 80 fd callq 0xfd80b0cb 14: 41 83 ed 01 sub $0x1,%r13d 18: 31 ff xor %edi,%edi 1a: 31 c0 xor %eax,%eax 1c: 44 89 ee mov %r13d,%esi 1f: 49 03 1e add (%r14),%rbx 22: 49 13 5e 08 adc 0x8(%r14),%rbx 26: 49 13 5e 10 adc 0x10(%r14),%rbx * 2a: 49 13 5e 18 adc 0x18(%r14),%rbx <-- trapping instruction 2e: 49 13 5e 20 adc 0x20(%r14),%rbx 32: 49 13 5e 28 adc 0x28(%r14),%rbx 36: 49 13 5e 30 adc 0x30(%r14),%rbx 3a: 49 13 5e 38 adc 0x38(%r14),%rbx 3e: 48 rex.W 3f: 11 .byte 0x11