Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f] CPU: 1 UID: 0 PID: 7812 Comm: syz.1.479 Not tainted 6.16.0-rc4-syzkaller-00991-g6b9fd8857b9f #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__list_del_entry_valid_or_report+0x25/0x190 lib/list_debug.c:49 Code: 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 41 54 53 48 89 fb 49 bd 00 00 00 00 00 fc ff df 48 83 c7 08 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 ff ea 5b fd 4c 8b 7b 08 48 89 d8 48 c1 e8 RSP: 0018:ffffc9001d22ef80 EFLAGS: 00010202 RAX: 000000000000000b RBX: 0000000000000050 RCX: ffff88807a265a00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000058 RBP: dffffc0000000000 R08: ffff88807a265a00 R09: 0000000000000002 R10: 00000000ffffffff R11: ffffffff89871920 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000050 R15: ffff888058d81800 FS: 00007f0d7ce986c0(0000) GS:ffff888125d16000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30e20220 CR3: 0000000079048000 CR4: 00000000003526f0 Call Trace: __list_del_entry_valid include/linux/list.h:124 [inline] __list_del_entry include/linux/list.h:215 [inline] list_del_init include/linux/list.h:287 [inline] drr_qlen_notify+0x2c/0xf0 net/sched/sch_drr.c:238 qdisc_tree_reduce_backlog+0x299/0x480 net/sched/sch_api.c:811 fq_change+0x1519/0x1f50 net/sched/sch_fq.c:1147 fq_init+0x699/0x960 net/sched/sch_fq.c:1201 qdisc_create+0x7a9/0xea0 net/sched/sch_api.c:1324 __tc_modify_qdisc net/sched/sch_api.c:1749 [inline] tc_modify_qdisc+0x1426/0x2010 net/sched/sch_api.c:1813 rtnetlink_rcv_msg+0x77c/0xb70 net/core/rtnetlink.c:6955 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2534 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0d7bf8e929 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:00007f0d7ce98038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0d7c1b6080 RCX: 00007f0d7bf8e929 RDX: 0000000000004000 RSI: 0000200000000280 RDI: 0000000000000004 RBP: 00007f0d7c010b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0d7c1b6080 R15: 00007ffd51f8df38 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__list_del_entry_valid_or_report+0x25/0x190 lib/list_debug.c:49 Code: 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 41 55 41 54 53 48 89 fb 49 bd 00 00 00 00 00 fc ff df 48 83 c7 08 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 05 e8 ff ea 5b fd 4c 8b 7b 08 48 89 d8 48 c1 e8 RSP: 0018:ffffc9001d22ef80 EFLAGS: 00010202 RAX: 000000000000000b RBX: 0000000000000050 RCX: ffff88807a265a00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000058 RBP: dffffc0000000000 R08: ffff88807a265a00 R09: 0000000000000002 R10: 00000000ffffffff R11: ffffffff89871920 R12: 0000000000000000 R13: dffffc0000000000 R14: 0000000000000050 R15: ffff888058d81800 FS: 00007f0d7ce986c0(0000) GS:ffff888125d16000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30e20220 CR3: 0000000079048000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: f3 0f 1e fa endbr64 9: 41 57 push %r15 b: 41 56 push %r14 d: 41 55 push %r13 f: 41 54 push %r12 11: 53 push %rbx 12: 48 89 fb mov %rdi,%rbx 15: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 1c: fc ff df 1f: 48 83 c7 08 add $0x8,%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 05 je 0x36 31: e8 ff ea 5b fd call 0xfd5beb35 36: 4c 8b 7b 08 mov 0x8(%rbx),%r15 3a: 48 89 d8 mov %rbx,%rax 3d: 48 rex.W 3e: c1 .byte 0xc1 3f: e8 .byte 0xe8