general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 17084 Comm: syz.1.7065 Not tainted 6.1.128-syzkaller-00014-g33c9d4844afc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:bq_flush_to_queue+0x47/0x6e0 kernel/bpf/cpumap.c:713
Code: df e8 9d 64 dd ff 49 8d 5f 50 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 23 03 25 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:ffffc90000c478b8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90007549000 RSI: 0000000000000078 RDI: 0000000000000079
RBP: ffffc90000c47948 R08: ffffffff819830c8 R09: ffffffff83215df2
R10: 0000000000000002 R11: ffff88811a005100 R12: dffffc0000000000
R13: ffff8881f6e34440 R14: ffff8881f6e34440 R15: ffff8881f6e00000
FS: 00007fa68a87f6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000400000001840 CR3: 0000000119bc7000 CR4: 00000000003506b0
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:4208
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: 0033:0x7fa68998bc1f
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:00007fa68a87f000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fa689ba5fa0 RCX: 00007fa68998bc1f
RDX: 000000000000007e RSI: 0000400000000300 RDI: 00000000000000c8
RBP: 00007fa689a0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000007e R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa689ba5fa0 R15: 00007ffceabce618
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bq_flush_to_queue+0x47/0x6e0 kernel/bpf/cpumap.c:713
Code: df e8 9d 64 dd ff 49 8d 5f 50 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 23 03 25 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:ffffc90000c478b8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90007549000 RSI: 0000000000000078 RDI: 0000000000000079
RBP: ffffc90000c47948 R08: ffffffff819830c8 R09: ffffffff83215df2
R10: 0000000000000002 R11: ffff88811a005100 R12: dffffc0000000000
R13: ffff8881f6e34440 R14: ffff8881f6e34440 R15: ffff8881f6e00000
FS: 00007fa68a87f6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000400000001840 CR3: 0000000119bc7000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: df e8 fucomip %st(0),%st
2: 9d popf
3: 64 dd ff fs (bad)
6: 49 8d 5f 50 lea 0x50(%r15),%rbx
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 23 03 25 00 call 0x250343
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