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: 11087 Comm: syz.0.3800 Tainted: G        W          6.1.84-syzkaller-00005-g96d66062d076 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:bq_flush_to_queue+0x47/0x6e0 kernel/bpf/cpumap.c:713
Code: df e8 6d 8d dd ff 49 8d 5f 50 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 03 9a 24 00 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 cd 04 00 00 48 89 5d 80 44 8b 33 4d 8d
RSP: 0018:ffffc900029578d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90002cb9000 RSI: 0000000000000076 RDI: 0000000000000077
RBP: ffffc90002957968 R08: ffffffff8197f738 R09: ffffffff831f7dd2
R10: 0000000000000002 R11: ffff88811b025100 R12: dffffc0000000000
R13: ffff8881f7134440 R14: ffff8881f7134440 R15: ffff8881f7100000
FS:  00007f85a09ad6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f859fd04030 CR3: 000000012d67c000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __cpu_map_flush+0xab/0x130 kernel/bpf/cpumap.c:804
 xdp_do_flush+0x13/0x20 net/core/filter.c:4168
 tun_build_skb drivers/net/tun.c:1723 [inline]
 tun_get_user+0x1e4e/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+0x902/0xeb0 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
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f859fb7475f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 29 8c 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 7c 8c 02 00 48
RSP: 002b:00007f85a09ad010 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f859fd03f60 RCX: 00007f859fb7475f
RDX: 0000000000000019 RSI: 0000000020000000 RDI: 00000000000000c8
RBP: 00007f859fbe4e60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000019 R11: 0000000000000293 R12: 0000000000000000
R13: 000000000000000b R14: 00007f859fd03f60 R15: 00007fff1b80c278
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bq_flush_to_queue+0x47/0x6e0 kernel/bpf/cpumap.c:713
Code: df e8 6d 8d dd ff 49 8d 5f 50 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 03 9a 24 00 48 8b 1b 48 89 d8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 cd 04 00 00 48 89 5d 80 44 8b 33 4d 8d
RSP: 0018:ffffc900029578d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90002cb9000 RSI: 0000000000000076 RDI: 0000000000000077
RBP: ffffc90002957968 R08: ffffffff8197f738 R09: ffffffff831f7dd2
R10: 0000000000000002 R11: ffff88811b025100 R12: dffffc0000000000
R13: ffff8881f7134440 R14: ffff8881f7134440 R15: ffff8881f7100000
FS:  00007f85a09ad6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f859fd04030 CR3: 000000012d67c000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	e8 6d 8d dd ff       	call   0xffdd8d72
   5:	49 8d 5f 50          	lea    0x50(%r15),%rbx
   9:	48 89 d8             	mov    %rbx,%rax
   c:	48 c1 e8 03          	shr    $0x3,%rax
  10:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  15:	74 08                	je     0x1f
  17:	48 89 df             	mov    %rbx,%rdi
  1a:	e8 03 9a 24 00       	call   0x249a22
  1f:	48 8b 1b             	mov    (%rbx),%rbx
  22:	48 89 d8             	mov    %rbx,%rax
  25:	48 c1 e8 03          	shr    $0x3,%rax
* 29:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 cd 04 00 00    	jne    0x503
  36:	48 89 5d 80          	mov    %rbx,-0x80(%rbp)
  3a:	44 8b 33             	mov    (%rbx),%r14d
  3d:	4d                   	rex.WRB
  3e:	8d                   	.byte 0x8d