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: 12710 Comm: syz.3.5222 Not tainted 6.1.99-syzkaller-00049-g1fe91f863a7f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:bq_flush_to_queue+0x47/0x6e0 kernel/bpf/cpumap.c:713
Code: df e8 3d 89 dd ff 49 8d 5f 50 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 b3 ca 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:ffffc90000bd78b8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90000f69000 RSI: 000000000000007b RDI: 000000000000007c
RBP: ffffc90000bd7948 R08: ffffffff819818d8 R09: ffffffff83201ec2
R10: 0000000000000002 R11: ffff888111a65100 R12: dffffc0000000000
R13: ffff8881f6f34440 R14: ffff8881f6f34440 R15: ffff8881f7f000e0
FS:  00007f98b81a16c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020002342 CR3: 000000011669b000 CR4: 00000000003526a0
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:4176
 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+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: 0033:0x7f98b737cadf
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 c9 8d 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 1c 8e 02 00 48
RSP: 002b:00007f98b81a1000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f98b7535f80 RCX: 00007f98b737cadf
RDX: 000000000000003e RSI: 0000000020002340 RDI: 00000000000000c8
RBP: 00007f98b73f0296 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000003e R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f98b7535f80 R15: 00007fffd48081a8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bq_flush_to_queue+0x47/0x6e0 kernel/bpf/cpumap.c:713
Code: df e8 3d 89 dd ff 49 8d 5f 50 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 b3 ca 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:ffffc90000bd78b8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000040000
RDX: ffffc90000f69000 RSI: 000000000000007b RDI: 000000000000007c
RBP: ffffc90000bd7948 R08: ffffffff819818d8 R09: ffffffff83201ec2
R10: 0000000000000002 R11: ffff888111a65100 R12: dffffc0000000000
R13: ffff8881f6f34440 R14: ffff8881f6f34440 R15: ffff8881f7f000e0
FS:  00007f98b81a16c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020002342 CR3: 000000011669b000 CR4: 00000000003526a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	df e8                	fucomip %st(0),%st
   2:	3d 89 dd ff 49       	cmp    $0x49ffdd89,%eax
   7:	8d 5f 50             	lea    0x50(%rdi),%ebx
   a:	48 89 d8             	mov    %rbx,%rax
   d:	48 c1 e8 03          	shr    $0x3,%rax
  11:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  16:	74 08                	je     0x20
  18:	48 89 df             	mov    %rbx,%rdi
  1b:	e8 b3 ca 24 00       	call   0x24cad3
  20:	48 8b 1b             	mov    (%rbx),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 cd 04 00 00    	jne    0x504
  37:	48 89 5d 80          	mov    %rbx,-0x80(%rbp)
  3b:	44 8b 33             	mov    (%rbx),%r14d
  3e:	4d                   	rex.WRB
  3f:	8d                   	.byte 0x8d