8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read
[0000000e] *pgd=850ef003, *pmd=eabcd003
Internal error: Oops: 205 [#1] SMP ARM
Modules linked in:
CPU: 1 UID: 0 PID: 26256 Comm: syz.2.5644 Not tainted 6.15.0-rc5-syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
PC is at io_ring_buffer_select io_uring/kbuf.c:163 [inline]
PC is at io_buffer_select+0x50/0x18c io_uring/kbuf.c:207
LR is at rcu_read_unlock include/linux/rcupdate.h:873 [inline]
LR is at xa_load+0x68/0xa4 lib/xarray.c:1621
pc : [<80889aa8>]    lr : [<81a4c134>]    psr: 20000013
sp : dfa9de00  ip : dfa9ddc0  fp : dfa9de1c
r10: 00000240  r9 : 80000001  r8 : 00000000
r7 : dfa9de40  r6 : 00000000  r5 : 85c3f100  r4 : 85687000
r3 : 00000001  r2 : 00000000  r1 : 8556be00  r0 : 00000000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 8529ca00  DAC: 00000000
Register r0 information: NULL pointer
Register r1 information: slab kmalloc-64 start 8556be00 pointer offset 0 size 64
Register r2 information: NULL pointer
Register r3 information: non-paged memory
Register r4 information: slab io_kiocb start 85687000 pointer offset 0 size 192
Register r5 information: slab kmalloc-2k start 85c3f000 pointer offset 256 size 2048
Register r6 information: NULL pointer
Register r7 information: 2-page vmalloc region starting at 0xdfa9c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Register r8 information: NULL pointer
Register r9 information: non-slab/vmalloc memory
Register r10 information: non-paged memory
Register r11 information: 2-page vmalloc region starting at 0xdfa9c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Register r12 information: 2-page vmalloc region starting at 0xdfa9c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Process syz.2.5644 (pid: 26256, stack limit = 0xdfa9c000)
Stack: (0xdfa9de00 to 0xdfa9e000)
de00: 83686500 85687000 84ce8600 80000001 dfa9de84 dfa9de20 80893310 80889a64
de20: 00000000 0000001b 85687000 84ce8600 00010001 00000001 8057abbc 00000000
de40: 00000000 00000005 85687000 80000001 dfa9de84 12855057 80886ad8 85687000
de60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 84e7a400 dfa9debc dfa9de88
de80: 80886c70 80892fd0 856873c0 85687480 85687540 85c3f000 8568706c 85687000
dea0: 85dc0000 00000000 00000000 84e7a400 dfa9df14 dfa9dec0 80887840 80886c14
dec0: 8088e1fc 81a4c0d8 00000000 00000000 00000800 00000800 81cf0b5c 00000800
dee0: 85c3f000 12855057 85265e40 00000000 85c3f000 00003516 85265e40 00000000
df00: 84e7a400 00000000 dfa9dfa4 dfa9df18 808882e8 80887640 ecac8b10 85c3f040
df20: 00000000 00000000 81a4feb0 81a4fd80 dfa9df54 dfa9df40 8026b438 8029ce1c
df40: dfa9dfb0 40000000 dfa9df84 dfa9df58 802229dc 8026b3f4 00000000 8281d05c
df60: dfa9dfb0 0014c490 ecac8b10 80222930 00000000 12855057 dfa9dfac 00000000
df80: 00000000 002e630c 000001aa 8020029c 84e7a400 000001aa 00000000 dfa9dfa8
dfa0: 80200060 808881bc 00000000 00000000 00000006 00003516 00000000 00000000
dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bc80bc
dfe0: 76bc7ec0 76bc7eb0 0001939c 00131f30 60000010 00000006 00000000 00000000
Call trace: 
[<80889a58>] (io_buffer_select) from [<80893310>] (io_recv_buf_select io_uring/net.c:1098 [inline])
[<80889a58>] (io_buffer_select) from [<80893310>] (io_recv+0x34c/0x46c io_uring/net.c:1138)
 r7:80000001 r6:84ce8600 r5:85687000 r4:83686500
[<80892fc4>] (io_recv) from [<80886c70>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline])
[<80892fc4>] (io_recv) from [<80886c70>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759)
 r10:84e7a400 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0
 r4:85687000
[<80886c08>] (io_issue_sqe) from [<80887840>] (io_queue_sqe io_uring/io_uring.c:1975 [inline])
[<80886c08>] (io_issue_sqe) from [<80887840>] (io_submit_sqe io_uring/io_uring.c:2231 [inline])
[<80886c08>] (io_issue_sqe) from [<80887840>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2348)
 r10:84e7a400 r9:00000000 r8:00000000 r7:85dc0000 r6:85687000 r5:8568706c
 r4:85c3f000
[<80887634>] (io_submit_sqes) from [<808882e8>] (__do_sys_io_uring_enter io_uring/io_uring.c:3408 [inline])
[<80887634>] (io_submit_sqes) from [<808882e8>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3342)
 r10:00000000 r9:84e7a400 r8:00000000 r7:85265e40 r6:00003516 r5:85c3f000
 r4:00000000
[<808881b0>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfa9dfa8 to 0xdfa9dff0)
dfa0:                   00000000 00000000 00000006 00003516 00000000 00000000
dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bc80bc
dfe0: 76bc7ec0 76bc7eb0 0001939c 00131f30
 r10:000001aa r9:84e7a400 r8:8020029c r7:000001aa r6:002e630c r5:00000000
 r4:00000000
Code: e3130001 0a00002f e5910000 e1d120be (e1d030be) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e3130001 	tst	r3, #1
   4:	0a00002f 	beq	0xc8
   8:	e5910000 	ldr	r0, [r1]
   c:	e1d120be 	ldrh	r2, [r1, #14]
* 10:	e1d030be 	ldrh	r3, [r0, #14] <-- trapping instruction