general protection fault, probably for non-canonical address 0xdffffc000000001a: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000d0-0x00000000000000d7]
CPU: 1 PID: 6537 Comm: syz.1.2638 Not tainted 6.1.129-syzkaller-00055-gca24c52e3c25 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__xdp_enqueue kernel/bpf/devmap.c:481 [inline]
RIP: 0010:dev_map_enqueue+0x72/0x340 kernel/bpf/devmap.c:534
Code: 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 83 a0 25 00 48 8b 03 48 89 45 c8 4d 8d ae d0 00 00 00 4c 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ef e8 5f a0 25 00 bb 20 02 00 00 49 03
RSP: 0018:ffffc90002a3f7a0 EFLAGS: 00010202
RAX: 000000000000001a RBX: ffff8881260b4c20 RCX: 0000000000080000
RDX: ffffc90002abb000 RSI: 00000000000000be RDI: 00000000000000bf
RBP: ffffc90002a3f7e0 R08: ffffffff841583cd R09: ffffffff84158302
R10: 0000000000000004 R11: ffff88812bf9bcc0 R12: dffffc0000000000
R13: 00000000000000d0 R14: 0000000000000000 R15: ffff888116910000
FS:  00007f9d3d8456c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe55253e38 CR3: 00000001158aa000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __xdp_do_redirect_frame net/core/filter.c:4319 [inline]
 xdp_do_redirect+0x5ed/0xc60 net/core/filter.c:4367
 tun_xdp_act+0xdb/0xc00 drivers/net/tun.c:1625
 tun_build_skb drivers/net/tun.c:1715 [inline]
 tun_get_user+0xb35/0x3a90 drivers/net/tun.c:1818
 tun_chr_write_iter+0x129/0x210 drivers/net/tun.c:2044
 call_write_iter include/linux/fs.h:2274 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0xaf6/0xed0 fs/read_write.c:584
 ksys_write+0x199/0x2c0 fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:646
 x64_sys_call+0x2f/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f9d3c98bc1f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007f9d3d845000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9d3cba5fa0 RCX: 00007f9d3c98bc1f
RDX: 000000000000006a RSI: 0000200000000180 RDI: 00000000000000c8
RBP: 00007f9d3ca0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000006a R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9d3cba5fa0 R15: 00007fff8f07f628
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__xdp_enqueue kernel/bpf/devmap.c:481 [inline]
RIP: 0010:dev_map_enqueue+0x72/0x340 kernel/bpf/devmap.c:534
Code: 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 83 a0 25 00 48 8b 03 48 89 45 c8 4d 8d ae d0 00 00 00 4c 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 ef e8 5f a0 25 00 bb 20 02 00 00 49 03
RSP: 0018:ffffc90002a3f7a0 EFLAGS: 00010202
RAX: 000000000000001a RBX: ffff8881260b4c20 RCX: 0000000000080000
RDX: ffffc90002abb000 RSI: 00000000000000be RDI: 00000000000000bf
RBP: ffffc90002a3f7e0 R08: ffffffff841583cd R09: ffffffff84158302
R10: 0000000000000004 R11: ffff88812bf9bcc0 R12: dffffc0000000000
R13: 00000000000000d0 R14: 0000000000000000 R15: ffff888116910000
FS:  00007f9d3d8456c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe55253e38 CR3: 00000001158aa000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 d8                	mov    %ebx,%eax
   2:	48 c1 e8 03          	shr    $0x3,%rax
   6:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
   b:	74 08                	je     0x15
   d:	48 89 df             	mov    %rbx,%rdi
  10:	e8 83 a0 25 00       	call   0x25a098
  15:	48 8b 03             	mov    (%rbx),%rax
  18:	48 89 45 c8          	mov    %rax,-0x38(%rbp)
  1c:	4d 8d ae d0 00 00 00 	lea    0xd0(%r14),%r13
  23:	4c 89 e8             	mov    %r13,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ef             	mov    %r13,%rdi
  34:	e8 5f a0 25 00       	call   0x25a098
  39:	bb 20 02 00 00       	mov    $0x220,%ebx
  3e:	49                   	rex.WB
  3f:	03                   	.byte 0x3