8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read
[0000000e] *pgd=879d2003, *pmd=df898003
Internal error: Oops: 205 [#1] SMP ARM
Modules linked in:
CPU: 0 UID: 0 PID: 8018 Comm: syz.3.912 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 : [<80889aac>]    lr : [<81a4c2d4>]    psr: 20000013
sp : dfe95dd0  ip : dfe95d90  fp : dfe95dec
r10: 40000240  r9 : 80000001  r8 : 00000000
r7 : dfe95e10  r6 : 00000000  r5 : 84dc3100  r4 : 8790fd80
r3 : 00000001  r2 : 00000000  r1 : 8797fe80  r0 : 00000000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 85533680  DAC: fffffffd
Register r0 information: NULL pointer
Register r1 information: slab kmalloc-64 start 8797fe80 pointer offset 0 size 64
Register r2 information: NULL pointer
Register r3 information: non-paged memory
Register r4 information: slab io_kiocb start 8790fd80 pointer offset 0 size 192
Register r5 information: slab kmalloc-2k start 84dc3000 pointer offset 256 size 2048
Register r6 information: NULL pointer
Register r7 information: 2-page vmalloc region starting at 0xdfe94000 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 0xdfe94000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Register r12 information: 2-page vmalloc region starting at 0xdfe94000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Process syz.3.912 (pid: 8018, stack limit = 0xdfe94000)
Stack: (0xdfe95dd0 to 0xdfe96000)
5dc0:                                     848e1900 8790fd80 858cd000 00000000
5de0: dfe95e54 dfe95df0 80893314 80889a68 00000000 dfe95dd8 858cd000 08ce6a2e
5e00: 00010001 00000001 84dc3128 00000000 00000000 0000001b 00000000 852e0c00
5e20: dfe95e4c 08ce6a2e dfe95e54 8790fd80 81cf0ca0 00000000 00000000 00000000
5e40: 80000001 852e0c00 dfe95e7c dfe95e58 8088225c 80892fd4 8790fd80 80000001
5e60: 0000001b 81cf0b5c 84de2540 00000000 dfe95ebc dfe95e80 80886d2c 8088221c
5e80: 8790f000 8790f0c0 8790f180 81cf0ca0 8790f300 84dc3000 8790fdec 8790fd80
5ea0: 87a00000 00000000 00000000 852e0c00 dfe95f14 dfe95ec0 80887844 80886cf0
5ec0: 8088e200 81a4c278 00000000 00000000 00000001 00000001 81cf0b5c 00000001
5ee0: 84dc3000 08ce6a2e 84de2840 00000000 84dc3000 00003516 84de2840 00000000
5f00: 852e0c00 00000000 dfe95fa4 dfe95f18 808882ec 80887644 ecac8b10 84dc3040
5f20: 00000000 00000000 81a50050 81a4ff20 dfe95f54 dfe95f40 8026b438 8029ce24
5f40: dfe95fb0 40000000 dfe95f84 dfe95f58 802229dc 8026b3f4 00000000 8281d05c
5f60: dfe95fb0 0014c490 ecac8b10 80222930 00000000 08ce6a2e dfe95fac 00000000
5f80: 00000000 002e630c 000001aa 8020029c 852e0c00 000001aa 00000000 dfe95fa8
5fa0: 80200060 808881c0 00000000 00000000 00000004 00003516 00000000 00000000
5fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b810bc
5fe0: 76b80ec0 76b80eb0 0001939c 00131f30 60000010 00000004 00000000 00000000
Call trace: 
[<80889a5c>] (io_buffer_select) from [<80893314>] (io_recv_buf_select io_uring/net.c:1098 [inline])
[<80889a5c>] (io_buffer_select) from [<80893314>] (io_recv+0x34c/0x46c io_uring/net.c:1138)
 r7:00000000 r6:858cd000 r5:8790fd80 r4:848e1900
[<80892fc8>] (io_recv) from [<8088225c>] (__io_issue_sqe+0x4c/0x1c0 io_uring/io_uring.c:1734)
 r10:852e0c00 r9:80000001 r8:00000000 r7:00000000 r6:00000000 r5:81cf0ca0
 r4:8790fd80
[<80882210>] (__io_issue_sqe) from [<80886d2c>] (io_issue_sqe+0x48/0x59c io_uring/io_uring.c:1757)
 r9:00000000 r8:84de2540 r7:81cf0b5c r6:0000001b r5:80000001 r4:8790fd80
[<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)
 r10:852e0c00 r9:00000000 r8:00000000 r7:87a00000 r6:8790fd80 r5:8790fdec
 r4:84dc3000
[<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 r9:852e0c00 r8:00000000 r7:84de2840 r6:00003516 r5:84dc3000
 r4:00000000
[<808881b4>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfe95fa8 to 0xdfe95ff0)
5fa0:                   00000000 00000000 00000004 00003516 00000000 00000000
5fc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b810bc
5fe0: 76b80ec0 76b80eb0 0001939c 00131f30
 r10:000001aa r9:852e0c00 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