8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read
[0000000e] *pgd=84774003, *pmd=df791003
Internal error: Oops: 205 [#1] SMP ARM
Modules linked in:

CPU: 0 UID: 0 PID: 3104 Comm: syz-executor317 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 : [<81a4be54>]    psr: 20000013
sp : df971e18  ip : df971dd8  fp : df971e34
r10: 837d6500  r9 : 00000000  r8 : 80000001
r7 : df971e50  r6 : 00000000  r5 : 8423e100  r4 : 849fc000
r3 : 00000001  r2 : 00000000  r1 : 843623c0  r0 : 00000000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 849287c0  DAC: fffffffd
Register r0 information: NULL pointer
Register r1 information: slab kmalloc-64 start 843623c0 pointer offset 0 size 64
Register r2 information: NULL pointer
Register r3 information: non-paged memory
Register r4 information: slab io_kiocb start 849fc000 pointer offset 0 size 192
Register r5 information: slab kmalloc-2k start 8423e000 pointer offset 256 size 2048
Register r6 information: NULL pointer
Register r7 information: 2-page vmalloc region starting at 0xdf970000 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 837d6500 pointer offset 0 size 576
Register r11 information: 2-page vmalloc region starting at 0xdf970000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Register r12 information: 2-page vmalloc region starting at 0xdf970000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Process syz-executor317 (pid: 3104, stack limit = 0xdf970000)
Stack: (0xdf971e18 to 0xdf972000)
1e00:                                                       849fc000 8474b800
1e20: 00000000 00000040 df971e84 df971e38 80892d3c 808899cc 8057abbc 8030cb0c
1e40: 849fc000 00000001 019fc000 00000000 00000000 cce83187 80886a40 849fc000
1e60: 81cf0bd4 00000000 80000001 81cf0b5c 0000000a 8452d400 df971ebc df971e88
1e80: 80886df4 80892b18 00000000 00000000 00000000 8423e000 849fc06c 849fc000
1ea0: 84b80000 00000000 00000000 8452d400 df971f14 df971ec0 808877a8 80886b7c
1ec0: 8088e164 81a4bdf8 84584db8 849287c8 00000001 00000001 81cf0b5c 00000001
1ee0: 8423e000 cce83187 845a1000 00000000 8423e000 000027e2 845a1000 00000000
1f00: 8452d400 00000000 df971fa4 df971f18 80888250 808875a8 df971f74 8423e040
1f20: 00000000 00000000 df971fac df971f38 8022b8b8 8046ec28 df971f64 df971f48
1f40: 8057a6bc 841f1b00 00000000 8281d1f0 00000a0f 76f54000 df971fb0 80234108
1f60: 00000000 000f4240 df971fac df971f78 8023478c cce83187 000000c0 00000000
1f80: 00000000 0008e068 000001aa 8020029c 8452d400 000001aa 00000000 df971fa8
1fa0: 80200060 80888124 00000000 00000000 00000003 000027e2 00000000 00000000
1fc0: 00000000 00000000 0008e068 000001aa 00000001 00000000 000f4240 00000000
1fe0: 7ecbdc70 7ecbdc60 0001088c 0002f900 40000010 00000003 00000000 00000000
Call trace: 
[<808899c0>] (io_buffer_select) from [<80892d3c>] (io_recvmsg+0x230/0x420 io_uring/net.c:988)
 r7:00000040 r6:00000000 r5:8474b800 r4:849fc000
[<80892b0c>] (io_recvmsg) from [<80886df4>] (__io_issue_sqe io_uring/io_uring.c:1740 [inline])
[<80892b0c>] (io_recvmsg) from [<80886df4>] (io_issue_sqe+0x284/0x658 io_uring/io_uring.c:1759)
 r10:8452d400 r9:0000000a r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0bd4
 r4:849fc000
[<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)
 r10:8452d400 r9:00000000 r8:00000000 r7:84b80000 r6:849fc000 r5:849fc06c
 r4:8423e000
[<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 r9:8452d400 r8:00000000 r7:845a1000 r6:000027e2 r5:8423e000
 r4:00000000
[<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdf971fa8 to 0xdf971ff0)
1fa0:                   00000000 00000000 00000003 000027e2 00000000 00000000
1fc0: 00000000 00000000 0008e068 000001aa 00000001 00000000 000f4240 00000000
1fe0: 7ecbdc70 7ecbdc60 0001088c 0002f900
 r10:000001aa r9:8452d400 r8:8020029c r7:000001aa r6:0008e068 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