8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 0000000e when read
[0000000e] *pgd=855f9003, *pmd=df57c003
Internal error: Oops: 205 [#1] SMP ARM
Modules linked in:
CPU: 1 UID: 0 PID: 3962 Comm: syz.0.51 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 : dfb8de18  ip : dfb8ddd8  fp : dfb8de34
r10: 85006500  r9 : 00000000  r8 : 80000001
r7 : dfb8de50  r6 : 00000000  r5 : 849c6900  r4 : 855fe000
r3 : 00000001  r2 : 00000000  r1 : 855335c0  r0 : 00000000
Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 855ccf40  DAC: 00000000
Register r0 information: NULL pointer
Register r1 information: slab kmalloc-64 start 855335c0 pointer offset 0 size 64
Register r2 information: NULL pointer
Register r3 information: non-paged memory
Register r4 information: slab io_kiocb start 855fe000 pointer offset 0 size 192
Register r5 information: slab kmalloc-2k start 849c6800 pointer offset 256 size 2048
Register r6 information: NULL pointer
Register r7 information: 2-page vmalloc region starting at 0xdfb8c000 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 85006500 pointer offset 0 size 576
Register r11 information: 2-page vmalloc region starting at 0xdfb8c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Register r12 information: 2-page vmalloc region starting at 0xdfb8c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2844
Process syz.0.51 (pid: 3962, stack limit = 0xdfb8c000)
Stack: (0xdfb8de18 to 0xdfb8e000)
de00:                                                       855fe000 8555c500
de20: 00000000 00000040 dfb8de84 dfb8de38 80892d3c 808899cc 8057abbc 8030cb0c
de40: 855fe000 00000001 015fe000 00000000 00000000 ff34fc24 80886a40 855fe000
de60: 81cf0bd4 00000000 80000001 81cf0b5c 0000000a 833ac800 dfb8debc dfb8de88
de80: 80886df4 80892b18 00000000 00000022 00000000 849c6800 855fe06c 855fe000
dea0: 85780000 00000000 00000000 833ac800 dfb8df14 dfb8dec0 808877a8 80886b7c
dec0: 8088e164 81a4bdf8 00000000 00000000 00000001 00000001 81cf0b5c 00000001
dee0: 849c6800 ff34fc24 8477c180 00000000 849c6800 000027e2 8477c180 00000000
df00: 833ac800 00000000 dfb8dfa4 dfb8df18 80888250 808875a8 ecac8b10 849c6840
df20: 00000000 00000000 81a4fbd0 81a4faa0 dfb8df54 dfb8df40 8026b438 8029ce1c
df40: dfb8dfb0 40000000 dfb8df84 dfb8df58 802229dc 8026b3f4 00000000 8281d05c
df60: dfb8dfb0 0014c490 ecac8b10 80222930 00000000 ff34fc24 dfb8dfac 00000000
df80: 00000000 002e630c 000001aa 8020029c 833ac800 000001aa 00000000 dfb8dfa8
dfa0: 80200060 80888124 00000000 00000000 00000006 000027e2 00000000 00000000
dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b3c0bc
dfe0: 76b3bec0 76b3beb0 0001939c 00131f30 60000010 00000006 00000000 00000000
Call trace: 
[<808899c0>] (io_buffer_select) from [<80892d3c>] (io_recvmsg+0x230/0x420 io_uring/net.c:988)
 r7:00000040 r6:00000000 r5:8555c500 r4:855fe000
[<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)
 r10:833ac800 r9:0000000a r8:81cf0b5c r7:80000001 r6:00000000 r5:81cf0bd4
 r4:855fe000
[<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)
 r10:833ac800 r9:00000000 r8:00000000 r7:85780000 r6:855fe000 r5:855fe06c
 r4:849c6800
[<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 r9:833ac800 r8:00000000 r7:8477c180 r6:000027e2 r5:849c6800
 r4:00000000
[<80888118>] (sys_io_uring_enter) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfb8dfa8 to 0xdfb8dff0)
dfa0:                   00000000 00000000 00000006 000027e2 00000000 00000000
dfc0: 00000000 00000000 002e630c 000001aa 002d0000 00000000 00006364 76b3c0bc
dfe0: 76b3bec0 76b3beb0 0001939c 00131f30
 r10:000001aa r9:833ac800 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