BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor instruction fetch in kernel mode #PF: error_code(0x0010) - not-present page PGD 2147f067 P4D 2147f067 PUD 7fc0b067 PMD 0 Oops: 0010 [#1] PREEMPT SMP KASAN CPU: 0 PID: 7202 Comm: syz-executor.4 Not tainted 6.7.0-rc8-next-20240105-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0018:ffffc90016097408 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88802505f000 RCX: ffffc9000b4a0000 RDX: 0000000000000000 RSI: 000000000000fff2 RDI: ffff88802505f000 RBP: ffffffff8f3b9260 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff889a45ad R12: ffff888031c5c000 R13: ffffffff8beef640 R14: 0000000000000001 R15: ffffffff8f3b9260 FS: 00007f27d41d16c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000029fde000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> qdisc_block_add_dev net/sched/sch_api.c:1219 [inline] qdisc_create+0x6c0/0x1440 net/sched/sch_api.c:1419 tc_modify_qdisc+0x4d5/0x1c30 net/sched/sch_api.c:1817 rtnetlink_rcv_msg+0x3c7/0xe00 net/core/rtnetlink.c:6615 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x53b/0x810 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x8b4/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xd5/0x180 net/socket.c:745 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2584 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638 __sys_sendmsg+0x117/0x1e0 net/socket.c:2667 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd0/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x62/0x6a RIP: 0033:0x7f27d347cce9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f27d41d10c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f27d359bf80 RCX: 00007f27d347cce9 RDX: 0000000000000000 RSI: 00000000200012c0 RDI: 0000000000000003 RBP: 00007f27d34c947a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f27d359bf80 R15: 00007fffc5fd1958 </TASK> Modules linked in: CR2: 0000000000000000 ---[ end trace 0000000000000000 ]--- RIP: 0010:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 0018:ffffc90016097408 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88802505f000 RCX: ffffc9000b4a0000 RDX: 0000000000000000 RSI: 000000000000fff2 RDI: ffff88802505f000 RBP: ffffffff8f3b9260 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff889a45ad R12: ffff888031c5c000 R13: ffffffff8beef640 R14: 0000000000000001 R15: ffffffff8f3b9260 FS: 00007f27d41d16c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffffffffd6 CR3: 0000000029fde000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400