8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read
[0000000e] *pgd=85d25003, *pmd=ed92f003
Internal error: Oops: 205 [#1] SMP ARM
Modules linked in:
CPU: 0 UID: 0 PID: 10842 Comm: syz.2.1703 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 : dfa2de18  ip : dfa2ddd8  fp : dfa2de34
r10: 84c70a00  r9 : 00000000  r8 : 80000001
r7 : dfa2de50  r6 : 00000000  r5 : 85ea4900  r4 : 85995000
r3 : 00000001  r2 : 00000000  r1 : 8521a6c0  r0 : 00000000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 84831140  DAC: fffffffd
Register r0 information: NULL pointer
Register r1 information: slab kmalloc-64 start 8521a6c0 pointer offset 0 size 64
Register r2 information: NULL pointer
Register r3 information: non-paged memory
Register r4 information: slab io_kiocb start 85995000 pointer offset 0 size 192
Register r5 information: slab kmalloc-2k start 85ea4800 pointer offset 256 size 2048
Register r6 information: NULL pointer
Register r7 information: 2-page vmalloc region starting at 0xdfa2c000 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 84c70a00 pointer offset 0 size 576
Register r11 information: 2-page vmalloc region starting at 0xdfa2c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Register r12 information: 2-page vmalloc region starting at 0xdfa2c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Process syz.2.1703 (pid: 10842, stack limit = 0xdfa2c000)
Stack: (0xdfa2de18 to 0xdfa2e000)
de00:                                                       85995000 85809f00
de20: 00000000 00000040 dfa2de84 dfa2de38 80892dd4 80889a64 8057abbc 8030cb0c
de40: 85995000 00000001 01995000 00000000 00000000 c1066573 80886ad8 85995000
de60: 81cf0bd4 00000000 80000001 81cf0b5c 0000000a 8390c800 dfa2debc dfa2de88
de80: 80886e8c 80892bb0 00000000 00000000 00000000 85ea4800 8599506c 85995000
dea0: 85d80000 00000000 00000000 8390c800 dfa2df14 dfa2dec0 80887840 80886c14
dec0: 8088e1fc 81a4c0d8 00000000 00000000 00000001 00000001 81cf0b5c 00000001
dee0: 85ea4800 c1066573 8471fc00 00000000 85ea4800 000027e2 8471fc00 00000000
df00: 8390c800 00000000 dfa2dfa4 dfa2df18 808882e8 80887640 ecac8b10 85ea4840
df20: 00000000 00000000 81a4feb0 81a4fd80 dfa2df54 dfa2df40 8026b438 8029ce1c
df40: dfa2dfb0 40000000 dfa2df84 dfa2df58 802229dc 8026b3f4 00000000 8281d05c
df60: dfa2dfb0 0014c490 ecac8b10 80222930 00000000 c1066573 dfa2dfac 00000000
df80: 00000000 002e630c 000001aa 8020029c 8390c800 000001aa 00000000 dfa2dfa8
dfa0: 80200060 808881bc 00000000 00000000 00000003 000027e2 00000000 00000000
dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b8f0bc
dfe0: 76b8eec0 76b8eeb0 0001939c 00131f30 60000010 00000003 00000000 00000000
Call trace: 
[<80889a58>] (io_buffer_select) from [<80892dd4>] (io_recvmsg+0x230/0x420 io_uring/net.c:988)
 r7:00000040 r6:00000000 r5:85809f00 r4:85995000
[<80892ba4>] (io_recvmsg) from [<80886e8c>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline])
[<80892ba4>] (io_recvmsg) from [<80886e8c>] (io_issue_sqe+0x284/0x658 io_uring/io_uring.c:1759)
 r10:8390c800 r9:0000000a r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0bd4
 r4:85995000
[<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)
 r10:8390c800 r9:00000000 r8:00000000 r7:85d80000 r6:85995000 r5:8599506c
 r4:85ea4800
[<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 r9:8390c800 r8:00000000 r7:8471fc00 r6:000027e2 r5:85ea4800
 r4:00000000
[<808881b0>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfa2dfa8 to 0xdfa2dff0)
dfa0:                   00000000 00000000 00000003 000027e2 00000000 00000000
dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b8f0bc
dfe0: 76b8eec0 76b8eeb0 0001939c 00131f30
 r10:000001aa r9:8390c800 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