8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read
[0000000e] *pgd=8660a003, *pmd=eef7e003
Internal error: Oops: 205 [#1] SMP ARM
Modules linked in:
CPU: 1 UID: 0 PID: 17366 Comm: syz.6.1815 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 : [<80889a10>]    lr : [<81a4be34>]    psr: 20000013
sp : dfc21e00  ip : dfc21dc0  fp : dfc21e1c
r10: 00000240  r9 : 80000001  r8 : 00000000
r7 : dfc21e40  r6 : 00000000  r5 : 85494900  r4 : 85a35180
r3 : 00000001  r2 : 00000000  r1 : 86da0dc0  r0 : 00000000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 8542d080  DAC: 00000000
Register r0 information: NULL pointer
Register r1 information: slab kmalloc-64 start 86da0dc0 pointer offset 0 size 64
Register r2 information: NULL pointer
Register r3 information: non-paged memory
Register r4 information: slab io_kiocb start 85a35180 pointer offset 0 size 192
Register r5 information: slab kmalloc-2k start 85494800 pointer offset 256 size 2048
Register r6 information: NULL pointer
Register r7 information: 2-page vmalloc region starting at 0xdfc20000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Register r8 information: NULL pointer
Register r9 information: non-slab/vmalloc memory
Register r10 information: non-paged memory
Register r11 information: 2-page vmalloc region starting at 0xdfc20000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Register r12 information: 2-page vmalloc region starting at 0xdfc20000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Process syz.6.1815 (pid: 17366, stack limit = 0xdfc20000)
Stack: (0xdfc21e00 to 0xdfc22000)
1e00: 84820c80 85a35180 8464d600 80000001 dfc21e84 dfc21e20 80893278 808899cc
1e20: dfc21e4c dfc21e30 8089ec2c 8050a4c4 00010001 00000001 8057abbc 00000000
1e40: 00000000 00000006 85a35180 80000001 dfc21e84 6feef604 80886a40 85a35180
1e60: 81cf0ca0 00000000 80000001 81cf0b5c 0000001b 87918000 dfc21ebc dfc21e88
1e80: 80886bd8 80892f38 85a35d80 85a35cc0 85a35b40 85494800 85a351ec 85a35180
1ea0: 88720000 00000000 00000000 87918000 dfc21f14 dfc21ec0 808877a8 80886b7c
1ec0: 8088e164 81a4bdd8 00000000 00000000 00000800 00000800 81cf0b5c 00000800
1ee0: 85494800 6feef604 84408780 00000000 85494800 00003516 84408780 00000000
1f00: 87918000 00000000 dfc21fa4 dfc21f18 80888250 808875a8 ecac8b10 85494840
1f20: 00000000 00000000 81a4fbb0 81a4fa80 dfc21f54 dfc21f40 8026b438 8029ce1c
1f40: dfc21fb0 40000000 dfc21f84 dfc21f58 802229dc 8026b3f4 00000000 8281d05c
1f60: dfc21fb0 0014c490 ecac8b10 80222930 00000000 6feef604 dfc21fac 00000000
1f80: 00000000 002e643c 000001aa 8020029c 87918000 000001aa 00000000 dfc21fa8
1fa0: 80200060 80888124 00000000 00000000 00000007 00003516 00000000 00000000
1fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76baa0bc
1fe0: 76ba9ec0 76ba9eb0 0001939c 00131f30 60000010 00000007 00000000 00000000
Call trace: 
[<808899c0>] (io_buffer_select) from [<80893278>] (io_recv_buf_select io_uring/net.c:1098 [inline])
[<808899c0>] (io_buffer_select) from [<80893278>] (io_recv+0x34c/0x46c io_uring/net.c:1138)
 r7:80000001 r6:8464d600 r5:85a35180 r4:84820c80
[<80892f2c>] (io_recv) from [<80886bd8>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline])
[<80892f2c>] (io_recv) from [<80886bd8>] (io_issue_sqe+0x68/0x658 io_uring/io_uring.c:1759)
 r10:87918000 r9:0000001b r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0ca0
 r4:85a35180
[<80886b70>] (io_issue_sqe) from [<808877a8>] (io_queue_sqe io_uring/io_uring.c:1975 [inline])
[<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqe io_uring/io_uring.c:2231 [inline])
[<80886b70>] (io_issue_sqe) from [<808877a8>] (io_submit_sqes+0x20c/0x938 io_uring/io_uring.c:2348)
 r10:87918000 r9:00000000 r8:00000000 r7:88720000 r6:85a35180 r5:85a351ec
 r4:85494800
[<8088759c>] (io_submit_sqes) from [<80888250>] (__do_sys_io_uring_enter io_uring/io_uring.c:3408 [inline])
[<8088759c>] (io_submit_sqes) from [<80888250>] (sys_io_uring_enter+0x138/0x780 io_uring/io_uring.c:3342)
 r10:00000000 r9:87918000 r8:00000000 r7:84408780 r6:00003516 r5:85494800
 r4:00000000
[<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfc21fa8 to 0xdfc21ff0)
1fa0:                   00000000 00000000 00000007 00003516 00000000 00000000
1fc0: 00000000 00000000 002e643c 000001aa 002d0000 00000000 00006364 76baa0bc
1fe0: 76ba9ec0 76ba9eb0 0001939c 00131f30
 r10:000001aa r9:87918000 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