8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read
[0000000e] *pgd=84a5e003, *pmd=ee888003
Internal error: Oops: 205 [#1] SMP ARM
Modules linked in:
CPU: 0 UID: 0 PID: 21072 Comm: syz.0.4152 Not tainted 6.15.0-rc6-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 : [<80889b04>]    lr : [<81a4c354>]    psr: 20000013
sp : dfa25de8  ip : dfa25da8  fp : dfa25e04
r10: 83522c80  r9 : 00000000  r8 : 80000001
r7 : dfa25e20  r6 : 00000000  r5 : 85813900  r4 : 85a7b000
r3 : 00000001  r2 : 00000000  r1 : 85196440  r0 : 00000000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 85196fc0  DAC: fffffffd
Register r0 information: NULL pointer
Register r1 information: slab kmalloc-64 start 85196440 pointer offset 0 size 64
Register r2 information: NULL pointer
Register r3 information: non-paged memory
Register r4 information: slab io_kiocb start 85a7b000 pointer offset 0 size 192
Register r5 information: slab kmalloc-2k start 85813800 pointer offset 256 size 2048
Register r6 information: NULL pointer
Register r7 information: 2-page vmalloc region starting at 0xdfa24000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Register r8 information: non-slab/vmalloc memory
Register r9 information: NULL pointer
Register r10 information: slab sock_inode_cache start 83522c80 pointer offset 0 size 576
Register r11 information: 2-page vmalloc region starting at 0xdfa24000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Register r12 information: 2-page vmalloc region starting at 0xdfa24000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Process syz.0.4152 (pid: 21072, stack limit = 0xdfa24000)
Stack: (0xdfa25de8 to 0xdfa26000)
5de0:                   85a7b000 85439600 00000000 00000040 dfa25e54 dfa25e08
5e00: 80892e30 80889ac0 85813928 000000e8 85b40000 00000001 01000000 00000000
5e20: 00000000 bff356f3 dfa25e54 85a7b000 81cf0bd4 00000000 00000000 00000000
5e40: 80000001 83ae6c00 dfa25e7c dfa25e58 808822b4 80892c0c 85a7b000 80000001
5e60: 0000000a 81cf0b5c 842aec00 00000000 dfa25ebc dfa25e80 80886d84 80882274
5e80: 00000000 00000000 00000000 81cf0bd4 00000000 85813800 85a7b06c 85a7b000
5ea0: 85b40000 00000000 00000000 83ae6c00 dfa25f14 dfa25ec0 8088789c 80886d48
5ec0: 8088e258 81a4c2f8 00000000 00000000 00000001 00000001 81cf0b5c 00000001
5ee0: 85813800 bff356f3 842ae9c0 00000000 85813800 00005b43 842ae9c0 00000000
5f00: 83ae6c00 00000000 dfa25fa4 dfa25f18 80888344 8088769c ecac8b10 85813840
5f20: 00000000 00000000 81a500d0 81a4ffa0 dfa25f54 dfa25f40 8026b438 8029ce24
5f40: dfa25fb0 40000000 dfa25f84 dfa25f58 802229dc 8026b3f4 00000000 8281d05c
5f60: dfa25fb0 0014c490 ecac8b10 80222930 00000000 bff356f3 dfa25fac 00000000
5f80: 00000000 002e643c 000001aa 8020029c 83ae6c00 000001aa 00000000 dfa25fa8
5fa0: 80200060 80888218 00000000 00000000 00000007 00005b43 00000000 00000000
5fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76b490bc
5fe0: 76b48ec0 76b48eb0 0001939c 00131f30 60000010 00000007 00000000 00000000
Call trace: 
[<80889ab4>] (io_buffer_select) from [<80892e30>] (io_recvmsg+0x230/0x420 io_uring/net.c:988)
 r7:00000040 r6:00000000 r5:85439600 r4:85a7b000
[<80892c00>] (io_recvmsg) from [<808822b4>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734)
 r10:83ae6c00 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0bd4
 r4:85a7b000
[<80882268>] (__io_issue_sqe) from [<80886d84>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757)
 r9:00000000 r8:842aec00 r7:81cf0b5c r6:0000000a r5:80000001 r4:85a7b000
[<80886d3c>] (io_issue_sqe) from [<8088789c>] (io_queue_sqe io_uring/io_uring.c:1963 [inline])
[<80886d3c>] (io_issue_sqe) from [<8088789c>] (io_submit_sqe io_uring/io_uring.c:2219 [inline])
[<80886d3c>] (io_issue_sqe) from [<8088789c>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2336)
 r10:83ae6c00 r9:00000000 r8:00000000 r7:85b40000 r6:85a7b000 r5:85a7b06c
 r4:85813800
[<80887690>] (io_submit_sqes) from [<80888344>] (__do_sys_io_uring_enter io_uring/io_uring.c:3396 [inline])
[<80887690>] (io_submit_sqes) from [<80888344>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3330)
 r10:00000000 r9:83ae6c00 r8:00000000 r7:842ae9c0 r6:00005b43 r5:85813800
 r4:00000000
[<8088820c>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfa25fa8 to 0xdfa25ff0)
5fa0:                   00000000 00000000 00000007 00005b43 00000000 00000000
5fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76b490bc
5fe0: 76b48ec0 76b48eb0 0001939c 00131f30
 r10:000001aa r9:83ae6c00 r8:8020029c r7:000001aa r6:002e643c 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