8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read
[0000000e] *pgd=84913003, *pmd=df8f4003
Internal error: Oops: 205 [#1] SMP ARM
Modules linked in:
CPU: 1 UID: 0 PID: 6817 Comm: syz.2.831 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 : [<80889bf4>]    lr : [<81a4c414>]    psr: 20000013
sp : dfa6dde8  ip : dfa6dda8  fp : dfa6de04
r10: 837d6c80  r9 : 00000000  r8 : 80000001
r7 : dfa6de20  r6 : 00000000  r5 : 85056100  r4 : 8491a000
r3 : 00000001  r2 : 00000000  r1 : 84b99e40  r0 : 00000000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 84b99f40  DAC: 00000000
Register r0 information: NULL pointer
Register r1 information: slab kmalloc-64 start 84b99e40 pointer offset 0 size 64
Register r2 information: NULL pointer
Register r3 information: non-paged memory
Register r4 information: slab io_kiocb start 8491a000 pointer offset 0 size 192
Register r5 information: slab kmalloc-2k start 85056000 pointer offset 256 size 2048
Register r6 information: NULL pointer
Register r7 information: 2-page vmalloc region starting at 0xdfa6c000 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 837d6c80 pointer offset 0 size 576
Register r11 information: 2-page vmalloc region starting at 0xdfa6c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Register r12 information: 2-page vmalloc region starting at 0xdfa6c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Process syz.2.831 (pid: 6817, stack limit = 0xdfa6c000)
Stack: (0xdfa6dde8 to 0xdfa6e000)
dde0:                   8491a000 84b87900 00000000 00000040 dfa6de54 dfa6de08
de00: 80892f20 80889bb0 dfa6debc dfa6de18 80200bcc 00000001 01000000 00000000
de20: 00000000 c48b69de dfa6de54 8491a000 81cf0bd4 00000000 00000000 00000000
de40: 80000001 83a6b000 dfa6de7c dfa6de58 808823a4 80892cfc 8491a000 80000001
de60: 0000000a 81cf0b5c 853d1c00 00000000 dfa6debc dfa6de80 80886e74 80882364
de80: 00000000 00000000 00000000 81cf0bd4 00000000 85056000 8491a06c 8491a000
dea0: 849d0000 00000000 00000000 83a6b000 dfa6df14 dfa6dec0 8088798c 80886e38
dec0: 8088e348 81a4c3b8 00000000 00000000 00000001 00000001 81cf0b5c 00000001
dee0: 85056000 c48b69de 853d1300 00000000 85056000 000027e2 853d1300 00000000
df00: 83a6b000 00000000 dfa6dfa4 dfa6df18 80888434 8088778c ecac8b10 85056040
df20: 00000000 00000000 81a50190 81a50060 dfa6df54 dfa6df40 8026b438 8029ce24
df40: dfa6dfb0 40000000 dfa6df84 dfa6df58 802229dc 8026b3f4 00000000 8281d05c
df60: dfa6dfb0 0014c490 ecac8b10 80222930 00000000 c48b69de dfa6dfac 00000000
df80: 00000000 002e630c 000001aa 8020029c 83a6b000 000001aa 00000000 dfa6dfa8
dfa0: 80200060 80888308 00000000 00000000 00000003 000027e2 00000000 00000000
dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bfa0bc
dfe0: 76bf9ec0 76bf9eb0 0001939c 00131f30 60000010 00000003 00000000 00000000
Call trace: 
[<80889ba4>] (io_buffer_select) from [<80892f20>] (io_recvmsg+0x230/0x420 io_uring/net.c:988)
 r7:00000040 r6:00000000 r5:84b87900 r4:8491a000
[<80892cf0>] (io_recvmsg) from [<808823a4>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734)
 r10:83a6b000 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0bd4
 r4:8491a000
[<80882358>] (__io_issue_sqe) from [<80886e74>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757)
 r9:00000000 r8:853d1c00 r7:81cf0b5c r6:0000000a r5:80000001 r4:8491a000
[<80886e2c>] (io_issue_sqe) from [<8088798c>] (io_queue_sqe io_uring/io_uring.c:1963 [inline])
[<80886e2c>] (io_issue_sqe) from [<8088798c>] (io_submit_sqe io_uring/io_uring.c:2219 [inline])
[<80886e2c>] (io_issue_sqe) from [<8088798c>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2336)
 r10:83a6b000 r9:00000000 r8:00000000 r7:849d0000 r6:8491a000 r5:8491a06c
 r4:85056000
[<80887780>] (io_submit_sqes) from [<80888434>] (__do_sys_io_uring_enter io_uring/io_uring.c:3396 [inline])
[<80887780>] (io_submit_sqes) from [<80888434>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3330)
 r10:00000000 r9:83a6b000 r8:00000000 r7:853d1300 r6:000027e2 r5:85056000
 r4:00000000
[<808882fc>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfa6dfa8 to 0xdfa6dff0)
dfa0:                   00000000 00000000 00000003 000027e2 00000000 00000000
dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bfa0bc
dfe0: 76bf9ec0 76bf9eb0 0001939c 00131f30
 r10:000001aa r9:83a6b000 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