general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 2408 Comm: syz-executor.0 Not tainted 6.1.78-syzkaller-00020-gcd89d4fa0722 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:dev_map_generic_redirect+0x90/0x7d0 kernel/bpf/devmap.c:664
Code: f1 f1 00 f2 f2 f2 4b 89 04 26 43 c7 44 26 0f f3 f3 f3 f3 43 c6 44 26 13 f3 e8 ac 07 de ff 48 89 d8 48 c1 e8 03 48 89 44 24 48 <42> 80 3c 20 00 74 08 48 89 df e8 f1 04 25 00 48 89 5c 24 18 4c 8b
RSP: 0018:ffffc900095e76c0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90002fa3000 RSI: 0000000000000119 RDI: 000000000000011a
RBP: ffffc900095e7818 R08: 0000000000000005 R09: ffffffff8411e4f3
R10: 0000000000000004 R11: ffff88811b92d100 R12: dffffc0000000000
R13: ffff8881127b43c0 R14: 1ffff920012bcee4 R15: 0000000000000000
FS:  00007f944c8d96c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020002000 CR3: 0000000124988000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 xdp_do_generic_redirect_map net/core/filter.c:4355 [inline]
 xdp_do_generic_redirect+0x411/0xad0 net/core/filter.c:4412
 do_xdp_generic+0x53e/0x800 net/core/dev.c:4954
 tun_get_user+0x238a/0x3a90 drivers/net/tun.c:1919
 tun_chr_write_iter+0x129/0x210 drivers/net/tun.c:2043
 call_write_iter include/linux/fs.h:2258 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x902/0xeb0 fs/read_write.c:584
----------------
Code disassembly (best guess):
   0:	f1                   	int1
   1:	f1                   	int1
   2:	00 f2                	add    %dh,%dl
   4:	f2 f2 4b 89 04 26    	repnz repnz mov %rax,(%r14,%r12,1)
   a:	43 c7 44 26 0f f3 f3 	movl   $0xf3f3f3f3,0xf(%r14,%r12,1)
  11:	f3 f3
  13:	43 c6 44 26 13 f3    	movb   $0xf3,0x13(%r14,%r12,1)
  19:	e8 ac 07 de ff       	call   0xffde07ca
  1e:	48 89 d8             	mov    %rbx,%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
  25:	48 89 44 24 48       	mov    %rax,0x48(%rsp)
* 2a:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 f1 04 25 00       	call   0x25052a
  39:	48 89 5c 24 18       	mov    %rbx,0x18(%rsp)
  3e:	4c                   	rex.WR
  3f:	8b                   	.byte 0x8b