Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] CPU: 1 UID: 0 PID: 10045 Comm: syz.2.1121 Not tainted 6.16.0-rc5-syzkaller-00038-g733923397fd9 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:qdisc_tree_reduce_backlog+0x1cb/0x500 net/sched/sch_api.c:806 Code: 4d 8b 67 18 49 8d 7c 24 08 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 ff 02 00 00 4d 8b 74 24 08 4d 8d 66 20 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 0f 85 1a 03 00 00 49 83 7e 20 00 74 48 e8 cf cf 36 f8 RSP: 0018:ffffc90005f77348 EFLAGS: 00010202 RAX: 0000000000000004 RBX: dffffc0000000000 RCX: ffffc90007571000 RDX: 0000000000080000 RSI: ffffffff898526ec RDI: ffffffff90aa1808 RBP: 00000000000afff2 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000020 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88802c441800 FS: 00007f72c05ad6c0(0000) GS:ffff8880d6816000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f72c05acf98 CR3: 000000005c5cc000 CR4: 0000000000352ef0 Call Trace: codel_change+0x6d9/0xc90 net/sched/sch_codel.c:153 codel_init+0x2e6/0x430 net/sched/sch_codel.c:172 qdisc_create+0x457/0xfc0 net/sched/sch_api.c:1324 __tc_modify_qdisc net/sched/sch_api.c:1749 [inline] tc_modify_qdisc+0x12bb/0x2130 net/sched/sch_api.c:1813 rtnetlink_rcv_msg+0x3c9/0xe90 net/core/rtnetlink.c:6953 netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0xa95/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 __sys_sendmsg+0x16d/0x220 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f72bf78e929 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f72c05ad038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f72bf9b5fa0 RCX: 00007f72bf78e929 RDX: 0000000000000800 RSI: 0000200000000100 RDI: 0000000000000004 RBP: 00007f72bf810b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f72bf9b5fa0 R15: 00007ffc26635778 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:qdisc_tree_reduce_backlog+0x1cb/0x500 net/sched/sch_api.c:806 Code: 4d 8b 67 18 49 8d 7c 24 08 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 ff 02 00 00 4d 8b 74 24 08 4d 8d 66 20 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 0f 85 1a 03 00 00 49 83 7e 20 00 74 48 e8 cf cf 36 f8 RSP: 0018:ffffc90005f77348 EFLAGS: 00010202 RAX: 0000000000000004 RBX: dffffc0000000000 RCX: ffffc90007571000 RDX: 0000000000080000 RSI: ffffffff898526ec RDI: ffffffff90aa1808 RBP: 00000000000afff2 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000020 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88802c441800 FS: 00007f72c05ad6c0(0000) GS:ffff8880d6816000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f72c05acf98 CR3: 000000005c5cc000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 4d 8b 67 18 mov 0x18(%r15),%r12 4: 49 8d 7c 24 08 lea 0x8(%r12),%rdi 9: 48 89 f8 mov %rdi,%rax c: 48 c1 e8 03 shr $0x3,%rax 10: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 14: 0f 85 ff 02 00 00 jne 0x319 1a: 4d 8b 74 24 08 mov 0x8(%r12),%r14 1f: 4d 8d 66 20 lea 0x20(%r14),%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 0f 85 1a 03 00 00 jne 0x34e 34: 49 83 7e 20 00 cmpq $0x0,0x20(%r14) 39: 74 48 je 0x83 3b: e8 cf cf 36 f8 call 0xf836d00f