8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000000 when read
[00000000] *pgd=83f6c003, *pmd=fe704003
Internal error: Oops: 205 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 16515 Comm: syz.1.3334 Not tainted 6.10.0-rc6-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at page_zonenum include/linux/mmzone.h:1102 [inline]
PC is at __kmap_local_page_prot+0xc/0x74 mm/highmem.c:573
LR is at kmap_local_page include/linux/highmem-internal.h:73 [inline]
LR is at copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360
pc : [<804810d0>]    lr : [<808067d4>]    psr: 60000013
sp : dfb6dca0  ip : dfb6dcb0  fp : dfb6dcac
r10: 00000018  r9 : 8285f4e8  r8 : 00000000
r7 : 00000000  r6 : 00000000  r5 : 00000000  r4 : 84586000
r3 : 00c00000  r2 : 0000071f  r1 : 00000000  r0 : 00000000
Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 84d2b600  DAC: fffffffd
Register r0 information: NULL pointer
Register r1 information: NULL pointer
Register r2 information: non-paged memory
Register r3 information: non-paged memory
Register r4 information: slab kmalloc-1k start 84586000 pointer offset 0 size 1024
Register r5 information: NULL pointer
Register r6 information: NULL pointer
Register r7 information: NULL pointer
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 0xdfb6c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797
Register r12 information: 2-page vmalloc region starting at 0xdfb6c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2797
Process syz.1.3334 (pid: 16515, stack limit = 0xdfb6c000)
Stack: (0xdfb6dca0 to 0xdfb6e000)
dca0: dfb6dce4 dfb6dcb0 808067d4 804810d0 dfb6dcd4 dfb6df48 8024d29c 84586000
dcc0: 84586000 00000000 00000001 00000000 000000c7 00000018 dfb6dd34 dfb6dce8
dce0: 81461fc4 808066e8 00000000 9810de58 850e7a00 850e7ae0 85176400 850e7ae8
dd00: dfb6df48 00000002 dfb6dd8c 85176400 000000c7 850e7a00 83485400 00000000
dd20: 00000102 00000000 dfb6dda4 dfb6dd38 81689af0 81461ee0 00000102 00000000
dd40: 00000000 00000000 00000000 00000000 85176488 850e7afc 85176634 dfb6df38
dd60: 00000000 9810de58 818f6a18 821cb998 00000102 9810de58 dfb6df38 816899a0
dd80: dfb6df38 833a7180 00000102 00000000 00000102 dfb6ddf4 dfb6ddc4 dfb6dda8
dda0: 81688838 816899ac 00000000 00000102 00000000 81688800 dfb6dde4 dfb6ddc8
ddc0: 813d1084 8168880c dfb6df38 200004c0 833a7180 00000000 dfb6dea4 dfb6dde8
dde0: 813d1288 813d1040 00000001 00000000 dfb6de34 00000000 00000000 00000000
de00: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
de20: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
de40: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
de60: 00000000 00000000 00000000 00000000 00000000 9810de58 00000000 00000000
de80: dfb6df38 200004c0 00000102 833a7180 83485400 00000129 dfb6df24 dfb6dea8
dea0: 813d436c 813d1204 00000102 00000000 802873d4 00000000 00000000 200002c0
dec0: 000000c7 00000000 00000000 00000000 00000000 00000000 00000000 00000000
dee0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 9810de58
df00: dfb6df24 833a7180 00000000 200004c0 00000102 8020029c dfb6dfa4 dfb6df28
df20: 813d4b4c 813d42f0 00000000 dfb6df38 00000001 fffffff7 dfb6ddf4 00000000
df40: 00000000 00000000 00000000 00000001 200002c0 000000c6 00000001 00000000
df60: 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000
df80: 8020c910 9810de58 00000000 00000000 002642e0 00000129 00000000 dfb6dfa8
dfa0: 80200060 813d4ae4 00000000 00000000 00000003 200004c0 00000102 00000000
dfc0: 00000000 00000000 002642e0 00000129 7efe8776 7efe8777 003d0f00 76bb00bc
dfe0: 76bafec8 76bafeb8 00017ecc 00130aa0 60000010 00000003 00000000 00000000
Call trace: 
[<804810c4>] (__kmap_local_page_prot) from [<808067d4>] (kmap_local_page include/linux/highmem-internal.h:73 [inline])
[<804810c4>] (__kmap_local_page_prot) from [<808067d4>] (copy_page_to_iter+0xf8/0x184 lib/iov_iter.c:360)
[<808066dc>] (copy_page_to_iter) from [<81461fc4>] (sk_msg_recvmsg+0xf0/0x3cc net/core/skmsg.c:437)
 r10:00000018 r9:000000c7 r8:00000000 r7:00000001 r6:00000000 r5:84586000
 r4:84586000
[<81461ed4>] (sk_msg_recvmsg) from [<81689af0>] (unix_bpf_recvmsg net/unix/unix_bpf.c:73 [inline])
[<81461ed4>] (sk_msg_recvmsg) from [<81689af0>] (unix_bpf_recvmsg+0x150/0x444 net/unix/unix_bpf.c:50)
 r10:00000000 r9:00000102 r8:00000000 r7:83485400 r6:850e7a00 r5:000000c7
 r4:85176400
[<816899a0>] (unix_bpf_recvmsg) from [<81688838>] (unix_dgram_recvmsg+0x38/0x4c net/unix/af_unix.c:2488)
 r10:dfb6ddf4 r9:00000102 r8:00000000 r7:00000102 r6:833a7180 r5:dfb6df38
 r4:816899a0
[<81688800>] (unix_dgram_recvmsg) from [<813d1084>] (sock_recvmsg_nosec net/socket.c:1046 [inline])
[<81688800>] (unix_dgram_recvmsg) from [<813d1084>] (sock_recvmsg+0x50/0x78 net/socket.c:1068)
 r4:81688800
[<813d1034>] (sock_recvmsg) from [<813d1288>] (____sys_recvmsg+0x90/0x184 net/socket.c:2804)
 r7:00000000 r6:833a7180 r5:200004c0 r4:dfb6df38
[<813d11f8>] (____sys_recvmsg) from [<813d436c>] (___sys_recvmsg+0x88/0xbc net/socket.c:2846)
 r10:00000129 r9:83485400 r8:833a7180 r7:00000102 r6:200004c0 r5:dfb6df38
 r4:00000000
[<813d42e4>] (___sys_recvmsg) from [<813d4b4c>] (__sys_recvmsg net/socket.c:2876 [inline])
[<813d42e4>] (___sys_recvmsg) from [<813d4b4c>] (__do_sys_recvmsg net/socket.c:2886 [inline])
[<813d42e4>] (___sys_recvmsg) from [<813d4b4c>] (sys_recvmsg+0x74/0xb8 net/socket.c:2883)
 r8:8020029c r7:00000102 r6:200004c0 r5:00000000 r4:833a7180
[<813d4ad8>] (sys_recvmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfb6dfa8 to 0xdfb6dff0)
dfa0:                   00000000 00000000 00000003 200004c0 00000102 00000000
dfc0: 00000000 00000000 002642e0 00000129 7efe8776 7efe8777 003d0f00 76bb00bc
dfe0: 76bafec8 76bafeb8 00017ecc 00130aa0
 r7:00000129 r6:002642e0 r5:00000000 r4:00000000
Code: eaffffe8 e1a0c00d e92dd800 e24cb004 (e5901000) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	eaffffe8 	b	0xffffffa8
   4:	e1a0c00d 	mov	ip, sp
   8:	e92dd800 	push	{fp, ip, lr, pc}
   c:	e24cb004 	sub	fp, ip, #4
* 10:	e5901000 	ldr	r1, [r0] <-- trapping instruction