syzbot

Unable to handle kernel paging request at virtual address dfff800000000004
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000004] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4163 Comm: syz.0.16 Not tainted 5.15.187-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : qdisc_tree_reduce_backlog+0x1e8/0x410 net/sched/sch_api.c:794
lr : qdisc_tree_reduce_backlog+0x19c/0x410 net/sched/sch_api.c:786
sp : ffff80001f576d20
x29: ffff80001f576d20 x28: 0000000000000004 x27: dfff800000000000
x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000020
x23: 00000000000afff2 x22: ffff8000162edce0 x21: ffff0000d7608000
x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000201
x17: 0000000000000000 x16: ffff8000082bf708 x15: 00000000ffffffff
x14: 0000000000ff0100 x13: ffffffffffffffff x12: 0000000000ff0100
x11: 0000000000000201 x10: 0000000000000000 x9 : ffff0000d395b680
x8 : 0000000000000000 x7 : ffff80000f8d3b08 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000008 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 qdisc_tree_reduce_backlog+0x1e8/0x410 net/sched/sch_api.c:794
 fq_codel_change+0x8b0/0xcf8 net/sched/sch_fq_codel.c:438
 fq_codel_init+0x25c/0x768 net/sched/sch_fq_codel.c:475
 qdisc_create+0x6e4/0xf24 net/sched/sch_api.c:1260
 tc_modify_qdisc+0x8bc/0x1308 net/sched/sch_api.c:-1
 rtnetlink_rcv_msg+0x9d4/0xd04 net/core/rtnetlink.c:5650
 netlink_rcv_skb+0x208/0x3c4 net/netlink/af_netlink.c:2489
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:5668
 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
 netlink_unicast+0x60c/0x89c net/netlink/af_netlink.c:1337
 netlink_sendmsg+0x6e8/0x9cc net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x61c/0x920 net/socket.c:2436
 ___sys_sendmsg+0x1d0/0x240 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg net/socket.c:2526 [inline]
 __arm64_sys_sendmsg+0x1a8/0x254 net/socket.c:2526
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: 14000020 f9400339 91008338 d343ff1c (387b6b88) 
---[ end trace bf1ac32b6530d0b8 ]---
----------------
Code disassembly (best guess):
   0:	14000020 	b	0x80
   4:	f9400339 	ldr	x25, [x25]
   8:	91008338 	add	x24, x25, #0x20
   c:	d343ff1c 	lsr	x28, x24, #3
* 10:	387b6b88 	ldrb	w8, [x28, x27] <-- trapping instruction