8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read
[0000000e] *pgd=8547e003, *pmd=df977003
Internal error: Oops: 205 [#1] SMP ARM
Modules linked in:
CPU: 0 UID: 0 PID: 8506 Comm: syz.2.1179 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 : [<80889aac>]    lr : [<81a4c2d4>]    psr: 20000013
sp : e00d9de8  ip : e00d9da8  fp : e00d9e04
r10: 8375a000  r9 : 00000000  r8 : 80000001
r7 : e00d9e20  r6 : 00000000  r5 : 85104100  r4 : 85d85000
r3 : 00000001  r2 : 00000000  r1 : 84cc9e80  r0 : 00000000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 85315d40  DAC: fffffffd
Register r0 information: NULL pointer
Register r1 information: slab kmalloc-64 start 84cc9e80 pointer offset 0 size 64
Register r2 information: NULL pointer
Register r3 information: non-paged memory
Register r4 information: slab io_kiocb start 85d85000 pointer offset 0 size 192
Register r5 information: slab kmalloc-2k start 85104000 pointer offset 256 size 2048
Register r6 information: NULL pointer
Register r7 information: 2-page vmalloc region starting at 0xe00d8000 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 8375a000 pointer offset 0 size 576
Register r11 information: 2-page vmalloc region starting at 0xe00d8000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Register r12 information: 2-page vmalloc region starting at 0xe00d8000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Process syz.2.1179 (pid: 8506, stack limit = 0xe00d8000)
Stack: (0xe00d9de8 to 0xe00da000)
9de0:                   85d85000 8592ef00 00000000 00000040 e00d9e54 e00d9e08
9e00: 80892dd8 80889a68 85104128 000000e8 858c0000 00000001 01000000 00000000
9e20: 00000000 32079387 e00d9e54 85d85000 81cf0bd4 00000000 00000000 00000000
9e40: 80000001 83252400 e00d9e7c e00d9e58 8088225c 80892bb4 85d85000 80000001
9e60: 0000000a 81cf0b5c 859bea80 00000000 e00d9ebc e00d9e80 80886d2c 8088221c
9e80: 00000000 00000000 00000000 81cf0bd4 00000000 85104000 85d8506c 85d85000
9ea0: 858c0000 00000000 00000000 83252400 e00d9f14 e00d9ec0 80887844 80886cf0
9ec0: 8088e200 81a4c278 00000000 00000000 00000001 00000001 81cf0b5c 00000001
9ee0: 85104000 32079387 859be9c0 00000000 85104000 00005b43 859be9c0 00000000
9f00: 83252400 00000000 e00d9fa4 e00d9f18 808882ec 80887644 ecac8b10 85104040
9f20: 00000000 00000000 81a50050 81a4ff20 e00d9f54 e00d9f40 8026b438 8029ce24
9f40: e00d9fb0 40000000 e00d9f84 e00d9f58 802229dc 8026b3f4 00000000 8281d05c
9f60: e00d9fb0 0014c490 ecac8b10 80222930 00000000 32079387 e00d9fac 00000000
9f80: 00000000 002e630c 000001aa 8020029c 83252400 000001aa 00000000 e00d9fa8
9fa0: 80200060 808881c0 00000000 00000000 00000003 00005b43 00000000 00000000
9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76be30bc
9fe0: 76be2ec0 76be2eb0 0001939c 00131f30 60000010 00000003 00000000 00000000
Call trace: 
[<80889a5c>] (io_buffer_select) from [<80892dd8>] (io_recvmsg+0x230/0x420 io_uring/net.c:988)
 r7:00000040 r6:00000000 r5:8592ef00 r4:85d85000
[<80892ba8>] (io_recvmsg) from [<8088225c>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734)
 r10:83252400 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0bd4
 r4:85d85000
[<80882210>] (__io_issue_sqe) from [<80886d2c>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757)
 r9:00000000 r8:859bea80 r7:81cf0b5c r6:0000000a r5:80000001 r4:85d85000
[<80886ce4>] (io_issue_sqe) from [<80887844>] (io_queue_sqe io_uring/io_uring.c:1963 [inline])
[<80886ce4>] (io_issue_sqe) from [<80887844>] (io_submit_sqe io_uring/io_uring.c:2219 [inline])
[<80886ce4>] (io_issue_sqe) from [<80887844>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2336)
 r10:83252400 r9:00000000 r8:00000000 r7:858c0000 r6:85d85000 r5:85d8506c
 r4:85104000
[<80887638>] (io_submit_sqes) from [<808882ec>] (__do_sys_io_uring_enter io_uring/io_uring.c:3396 [inline])
[<80887638>] (io_submit_sqes) from [<808882ec>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3330)
 r10:00000000 r9:83252400 r8:00000000 r7:859be9c0 r6:00005b43 r5:85104000
 r4:00000000
[<808881b4>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xe00d9fa8 to 0xe00d9ff0)
9fa0:                   00000000 00000000 00000003 00005b43 00000000 00000000
9fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76be30bc
9fe0: 76be2ec0 76be2eb0 0001939c 00131f30
 r10:000001aa r9:83252400 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