8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read
[0000000e] *pgd=856c8003, *pmd=df55a003
Internal error: Oops: 205 [#1] SMP ARM
Modules linked in:
CPU: 0 UID: 0 PID: 4447 Comm: syz.0.164 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 : dfba1de8  ip : dfba1da8  fp : dfba1e04
r10: 8379b180  r9 : 00000000  r8 : 80000001
r7 : dfba1e20  r6 : 00000000  r5 : 85022100  r4 : 856c1300
r3 : 00000001  r2 : 00000000  r1 : 856c4a80  r0 : 00000000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 856c4cc0  DAC: fffffffd
Register r0 information: NULL pointer
Register r1 information: slab kmalloc-64 start 856c4a80 pointer offset 0 size 64
Register r2 information: NULL pointer
Register r3 information: non-paged memory
Register r4 information: slab io_kiocb start 856c1300 pointer offset 0 size 192
Register r5 information: slab kmalloc-2k start 85022000 pointer offset 256 size 2048
Register r6 information: NULL pointer
Register r7 information: 2-page vmalloc region starting at 0xdfba0000 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 8379b180 pointer offset 0 size 576
Register r11 information: 2-page vmalloc region starting at 0xdfba0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Register r12 information: 2-page vmalloc region starting at 0xdfba0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Process syz.0.164 (pid: 4447, stack limit = 0xdfba0000)
Stack: (0xdfba1de8 to 0xdfba2000)
1de0:                   856c1300 85075700 00000000 00000040 dfba1e54 dfba1e08
1e00: 80892f20 80889bb0 85022128 000000e8 8551c000 00000001 01000000 00000000
1e20: 00000000 5ec2d99d dfba1e54 856c1300 81cf0bd4 00000000 00000000 00000000
1e40: 80000001 84f3bc00 dfba1e7c dfba1e58 808823a4 80892cfc 856c1300 80000001
1e60: 0000000a 81cf0b5c 8527fcc0 00000000 dfba1ebc dfba1e80 80886e74 80882364
1e80: 00000000 00000000 00000000 81cf0bd4 00000000 85022000 856c136c 856c1300
1ea0: 8551c000 00000000 00000000 84f3bc00 dfba1f14 dfba1ec0 8088798c 80886e38
1ec0: 8088e348 81a4c3b8 dfba1f24 dfba1ed8 00000001 00000001 81cf0b5c 00000001
1ee0: 85022000 5ec2d99d 8527f6c0 00000000 85022000 000027e2 8527f6c0 00000000
1f00: 84f3bc00 00000000 dfba1fa4 dfba1f18 80888434 8088778c ecac8b10 85022040
1f20: 00000000 00000000 81a50190 81a50060 dfba1f54 dfba1f40 8026b438 8029ce24
1f40: dfba1fb0 40000000 dfba1f84 dfba1f58 802229dc 8026b3f4 00000000 8281d05c
1f60: dfba1fb0 0014c490 ecac8b10 80222930 00000000 5ec2d99d dfba1fac 00000000
1f80: 00000000 002e630c 000001aa 8020029c 84f3bc00 000001aa 00000000 dfba1fa8
1fa0: 80200060 80888308 00000000 00000000 00000003 000027e2 00000000 00000000
1fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bc60bc
1fe0: 76bc5ec0 76bc5eb0 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 r5:85075700 r4:856c1300
[<80892cf0>] (io_recvmsg) from [<808823a4>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734)
 r10:84f3bc00 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0bd4
 r4:856c1300
[<80882358>] (__io_issue_sqe) from [<80886e74>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757)
 r9:00000000 r8:8527fcc0 r7:81cf0b5c r6:0000000a r5:80000001 r4:856c1300
[<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)
 r10:84f3bc00 r9:00000000 r8:00000000 r7:8551c000 r6:856c1300 r5:856c136c
 r4:85022000
[<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 r9:84f3bc00 r8:00000000 r7:8527f6c0 r6:000027e2 r5:85022000
 r4:00000000
[<808882fc>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfba1fa8 to 0xdfba1ff0)
1fa0:                   00000000 00000000 00000003 000027e2 00000000 00000000
1fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76bc60bc
1fe0: 76bc5ec0 76bc5eb0 0001939c 00131f30
 r10:000001aa r9:84f3bc00 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