BUG: unable to handle page fault for address: ffffed102d27dc86
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 7ffd5067 P4D 7ffd5067 PUD 3fffa067 PMD 0 
Oops: Oops: 0000 [#1] SMP KASAN NOPTI
CPU: 3 UID: 0 PID: 8108 Comm: syz.6.569 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__tcp_hdrlen include/linux/tcp.h:31 [inline]
RIP: 0010:qdisc_pkt_len_segs_init+0x37e/0xb30 net/core/dev.c:4193
Code: 03 80 3c 02 00 0f 85 de 06 00 00 48 b8 00 00 00 00 00 fc ff df 44 89 e5 48 03 ab d8 00 00 00 48 8d 7d 0c 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 b5
RSP: 0018:ffffc900005e8708 EFLAGS: 00010a03
RAX: dffffc0000000000 RBX: ffff888028faf680 RCX: 0000000000000101
RDX: 1ffff1102d27dc86 RSI: ffffffff89909dd2 RDI: ffff8881693ee434
RBP: ffff8881693ee428 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000030 R11: 0000000000000001 R12: 00000000fffffffc
R13: ffff888028faf6a8 R14: 0000000000000010 R15: ffff888028faf6f4
FS:  0000000000000000(0000) GS:ffff888096ca9000(0063) knlGS:00000000f542cb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffed102d27dc86 CR3: 00000000145fd000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 sch_handle_ingress net/core/dev.c:4530 [inline]
 __netif_receive_skb_core.constprop.0+0x1132/0x3530 net/core/dev.c:6115
 __netif_receive_skb_list_core+0x353/0x940 net/core/dev.c:6339
 __netif_receive_skb_list net/core/dev.c:6406 [inline]
 netif_receive_skb_list_internal+0x722/0xd40 net/core/dev.c:6497
 gro_normal_list include/net/gro.h:523 [inline]
 gro_normal_list include/net/gro.h:519 [inline]
 gro_flush_normal include/net/gro.h:531 [inline]
 napi_complete_done+0x221/0x940 net/core/dev.c:6865
 gro_cell_poll+0x4d0/0x6c0 net/core/gro_cells.c:74
 __napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7787
 napi_poll net/core/dev.c:7850 [inline]
 net_rx_action+0xa40/0xf20 net/core/dev.c:8007
 handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645
 do_softirq kernel/softirq.c:546 [inline]
 do_softirq+0xaf/0xf0 kernel/softirq.c:533
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xff/0x120 kernel/softirq.c:473
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 tun_rx_batched.isra.0+0x407/0x750 drivers/net/tun.c:1596
 tun_get_user+0x1f53/0x3cc0 drivers/net/tun.c:2045
 tun_chr_write_iter+0xdc/0x200 drivers/net/tun.c:2091
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6af/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline]
 __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291
 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf705efec
Code: Unable to access opcode bytes at 0xf705efc2.
RSP: 002b:00000000f542c50c EFLAGS: 00000292 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 0000000080000040
RDX: 000000000000fdef RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
CR2: ffffed102d27dc86
---[ end trace 0000000000000000 ]---
RIP: 0010:__tcp_hdrlen include/linux/tcp.h:31 [inline]
RIP: 0010:qdisc_pkt_len_segs_init+0x37e/0xb30 net/core/dev.c:4193
Code: 03 80 3c 02 00 0f 85 de 06 00 00 48 b8 00 00 00 00 00 fc ff df 44 89 e5 48 03 ab d8 00 00 00 48 8d 7d 0c 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 b5
RSP: 0018:ffffc900005e8708 EFLAGS: 00010a03
RAX: dffffc0000000000 RBX: ffff888028faf680 RCX: 0000000000000101
RDX: 1ffff1102d27dc86 RSI: ffffffff89909dd2 RDI: ffff8881693ee434
RBP: ffff8881693ee428 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000030 R11: 0000000000000001 R12: 00000000fffffffc
R13: ffff888028faf6a8 R14: 0000000000000010 R15: ffff888028faf6f4
FS:  0000000000000000(0000) GS:ffff888096ca9000(0063) knlGS:00000000f542cb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f705f000 CR3: 00000000145fd000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   4:	0f 85 de 06 00 00    	jne    0x6e8
   a:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  11:	fc ff df
  14:	44 89 e5             	mov    %r12d,%ebp
  17:	48 03 ab d8 00 00 00 	add    0xd8(%rbx),%rbp
  1e:	48 8d 7d 0c          	lea    0xc(%rbp),%rdi
  22:	48 89 fa             	mov    %rdi,%rdx
  25:	48 c1 ea 03          	shr    $0x3,%rdx
* 29:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx <-- trapping instruction
  2d:	48 89 f8             	mov    %rdi,%rax
  30:	83 e0 07             	and    $0x7,%eax
  33:	83 c0 01             	add    $0x1,%eax
  36:	38 d0                	cmp    %dl,%al
  38:	7c 08                	jl     0x42
  3a:	84 d2                	test   %dl,%dl
  3c:	0f                   	.byte 0xf
  3d:	85                   	.byte 0x85
  3e:	b5                   	.byte 0xb5