Unable to handle kernel paging request at virtual address dfff80000000000a
KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057]
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
[dfff80000000000a] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 6371 Comm: syz.0.485 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : dummy_queue+0x16c/0x74c drivers/usb/gadget/udc/dummy_hcd.c:736
lr : gadget_to_dummy_hcd drivers/usb/gadget/udc/dummy_hcd.c:317 [inline]
lr : dummy_queue+0x138/0x74c drivers/usb/gadget/udc/dummy_hcd.c:735
sp : ffff8000080075b0
x29: ffff8000080075e0 x28: 1fffe0001a3dd048 x27: ffff0000c3df4600
x26: ffff0000d1ee8c00 x25: dfff800000000000 x24: ffff0000d1ee8240
x23: dfff800000000000 x22: 1fffe000187be8c0 x21: 0000000000000050
x20: ffff0000d1ee8248 x19: ffff0000c3df4610 x18: 0000000000000000
x17: 0000000000a000ae x16: ffff8000082dd25c x15: 0000000000000000
x14: 0000000000000001 x13: 1fffe00019d3319b x12: 0000000000000000
x11: ff0080000dcf3194 x10: 0000000000000000 x9 : 0000000000000658
x8 : 000000000000000a x7 : ffff80000dddcdc8 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000a20 x1 : 0000000000000003 x0 : 0000000000000005
Call trace:
 dummy_queue+0x16c/0x74c drivers/usb/gadget/udc/dummy_hcd.c:736
 usb_ep_queue+0xe4/0x494 drivers/usb/gadget/udc/core.c:305
 eth_start_xmit+0x6b0/0xc5c drivers/usb/gadget/function/u_ether.c:590
 __netdev_start_xmit include/linux/netdevice.h:4889 [inline]
 netdev_start_xmit include/linux/netdevice.h:4903 [inline]
 xmit_one net/core/dev.c:3695 [inline]
 dev_hard_start_xmit+0x234/0x8c8 net/core/dev.c:3711
 sch_direct_xmit+0x234/0x4ac net/sched/sch_generic.c:345
 __dev_xmit_skb net/core/dev.c:3932 [inline]
 __dev_queue_xmit+0x1394/0x3154 net/core/dev.c:4337
 dev_queue_xmit include/linux/netdevice.h:3051 [inline]
 lapbeth_data_transmit+0x1f4/0x290 drivers/net/wan/lapbether.c:259
 lapb_data_transmit+0x8c/0xb0 net/lapb/lapb_iface.c:447
 lapb_transmit_buffer+0x160/0x200 net/lapb/lapb_out.c:149
 lapb_send_control+0x228/0x324 net/lapb/lapb_subr.c:251
 lapb_t1timer_expiry+0x458/0x808 net/lapb/lapb_timer.c:-1
 call_timer_fn+0x1b8/0x96c kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x478/0x6d8 kernel/time/timer.c:2023
 run_timer_softirq+0x7c/0x114 kernel/time/timer.c:2036
 handle_softirqs+0x318/0xc90 kernel/softirq.c:596
 __do_softirq+0x14/0x20 kernel/softirq.c:630
 ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:80
 call_on_irq_stack+0x30/0x48 arch/arm64/kernel/entry.S:897
 do_softirq_own_stack+0x20/0x2c arch/arm64/kernel/irq.c:85
 invoke_softirq kernel/softirq.c:477 [inline]
 __irq_exit_rcu+0x23c/0x430 kernel/softirq.c:679
 irq_exit_rcu+0x14/0x84 kernel/softirq.c:691
 __el1_irq arch/arm64/kernel/entry-common.c:472 [inline]
 el1_interrupt+0x38/0x54 arch/arm64/kernel/entry-common.c:486
 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:491
 el1h_64_irq+0x64/0x68 arch/arm64/kernel/entry.S:581
 arch_local_irq_restore arch/arm64/include/asm/irqflags.h:122 [inline]
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
 _raw_spin_unlock_irqrestore+0x58/0xac kernel/locking/spinlock.c:194
 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
 __wake_up_common_lock kernel/sched/wait.c:140 [inline]
 __wake_up_sync_key+0x120/0x184 kernel/sched/wait.c:208
 __unix_dgram_recvmsg+0x38c/0xb24 net/unix/af_unix.c:2480
 unix_dgram_recvmsg+0xd0/0xe8 net/unix/af_unix.c:2550
 ____sys_recvmsg+0x270/0x754 net/socket.c:-1
 ___sys_recvmsg net/socket.c:2780 [inline]
 do_recvmmsg+0x36c/0x9d8 net/socket.c:2874
 __sys_recvmmsg net/socket.c:2953 [inline]
 __do_sys_recvmmsg net/socket.c:2976 [inline]
 __se_sys_recvmmsg net/socket.c:2969 [inline]
 __arm64_sys_recvmmsg+0x184/0x244 net/socket.c:2969
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
Code: 96b0088e f94002a8 91014115 d343fea8 (38f96908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	96b0088e 	bl	0xfffffffffac02238
   4:	f94002a8 	ldr	x8, [x21]
   8:	91014115 	add	x21, x8, #0x50
   c:	d343fea8 	lsr	x8, x21, #3
* 10:	38f96908 	ldrsb	w8, [x8, x25] <-- trapping instruction