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: 4716 Comm: syz-executor.1 Not tainted 6.1.78-syzkaller-00017-g12709c5c1ed2 #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:ffffc90000a5f6c0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000040000 RDX: ffffc9000158d000 RSI: 000000000000041a RDI: 000000000000041b RBP: ffffc90000a5f818 R08: 0000000000000005 R09: ffffffff8411e3d3 R10: 0000000000000004 R11: ffff888115198000 R12: dffffc0000000000 R13: ffff888139c0f280 R14: 1ffff9200014bee4 R15: 0000000000000000 FS: 00007f2698a2a6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020010000 CR3: 0000000115d85000 CR4: 00000000003506b0 Call Trace: 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 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: 0033:0x7f2697c7bc6f Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 b9 80 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 0c 81 02 00 48 RSP: 002b:00007f2698a2a090 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f2697db3f80 RCX: 00007f2697c7bc6f RDX: 000000000000fdef RSI: 0000000020000780 RDI: 00000000000000c8 RBP: 00007f2697cec074 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000fdef R11: 0000000000000293 R12: 0000000000000000 R13: 000000000000000b R14: 00007f2697db3f80 R15: 00007ffe1a787958 Modules linked in: ---[ end trace 0000000000000000 ]--- 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:ffffc90000a5f6c0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000040000 RDX: ffffc9000158d000 RSI: 000000000000041a RDI: 000000000000041b RBP: ffffc90000a5f818 R08: 0000000000000005 R09: ffffffff8411e3d3 R10: 0000000000000004 R11: ffff888115198000 R12: dffffc0000000000 R13: ffff888139c0f280 R14: 1ffff9200014bee4 R15: 0000000000000000 FS: 00007f2698a2a6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020010000 CR3: 0000000115d85000 CR4: 00000000003506b0 ---------------- 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