gadgetfs: bound to dummy_udc driver
Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
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, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0
user pgtable: 4k pages, 52-bit VAs, pgdp=00000000437bb500
[0000000000000000] pgd=080000004b8d6403, p4d=08000000787ab403, pud=080000004bce2403, pmd=0000000000000000
Internal error: Oops: 0000000096000006 [#1]  SMP
Modules linked in:
CPU: 1 UID: 0 PID: 26465 Comm: syz.8.16709 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: linux,dummy-virt (DT)
pstate: 81402009 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
pc : dummy_udc_start+0x2c/0x9c drivers/usb/gadget/udc/dummy_hcd.c:1022
lr : usb_gadget_udc_start_locked drivers/usb/gadget/udc/core.c:1237 [inline]
lr : gadget_bind_driver+0x140/0x284 drivers/usb/gadget/udc/core.c:1667
sp : ffff80008674ba90
x29: ffff80008674ba90 x28: f5f000000c0c3300 x27: 0000000000000000
x26: 0000000000000000 x25: f8f0000005015b68 x24: ffff800082d259a0
x23: f4f0000005d02bc8 x22: ffff800082eabb58 x21: ffff800082d25958
x20: ffff800082d25958 x19: f8f0000005015800 x18: ffff800082b8d940
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000076c30cdf
x14: 0000000000000359 x13: 00000000fa83b2da x12: 0000814559989224
x11: 00000000000000c0 x10: 0463d7d4da0f850e x9 : c3579121713e21be
x8 : f5f000000c0c4378 x7 : 0000000000000004 x6 : 0000000000000000
x5 : fff000007f8b8188 x4 : 0000000000000001 x3 : 0000000000000000
x2 : ffff8000811fbb04 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 dummy_udc_start+0x2c/0x9c drivers/usb/gadget/udc/dummy_hcd.c:1024 (P)
 usb_gadget_udc_start_locked drivers/usb/gadget/udc/core.c:1237 [inline]
 gadget_bind_driver+0x140/0x284 drivers/usb/gadget/udc/core.c:1667
 call_driver_probe drivers/base/dd.c:628 [inline]
 really_probe+0xbc/0x2bc drivers/base/dd.c:706
 __driver_probe_device+0x118/0x16c drivers/base/dd.c:868
 driver_probe_device+0x3c/0x120 drivers/base/dd.c:898
 __driver_attach+0x90/0x180 drivers/base/dd.c:1292
 bus_for_each_dev+0x7c/0xdc drivers/base/bus.c:383
 driver_attach+0x24/0x30 drivers/base/dd.c:1310
 bus_add_driver+0xe4/0x208 drivers/base/bus.c:763
 driver_register+0x68/0x130 drivers/base/driver.c:174
 usb_gadget_register_driver_owner+0x54/0xfc drivers/usb/gadget/udc/core.c:1752
 dev_config+0x214/0x484 drivers/usb/gadget/legacy/inode.c:1883
 vfs_write+0xd4/0x36c fs/read_write.c:685
 ksys_write+0x70/0x108 fs/read_write.c:739
 __do_sys_write fs/read_write.c:750 [inline]
 __se_sys_write fs/read_write.c:747 [inline]
 __arm64_sys_write+0x1c/0x30 fs/read_write.c:747
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x54/0x10c arch/arm64/kernel/syscall.c:49
 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x1c/0x34 arch/arm64/kernel/syscall.c:140
 el0_svc+0x38/0x1fc arch/arm64/kernel/entry-common.c:736
 el0t_64_sync_handler+0xa0/0xf0 arch/arm64/kernel/entry-common.c:755
 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:594
Code: 7100143f 54000220 f9482000 51000421 (f9400013) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	7100143f 	cmp	w1, #0x5
   4:	54000220 	b.eq	0x48  // b.none
   8:	f9482000 	ldr	x0, [x0, #4160]
   c:	51000421 	sub	w1, w1, #0x1
* 10:	f9400013 	ldr	x19, [x0] <-- trapping instruction