8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000008 when read
[00000008] *pgd=84801003, *pmd=fe51b003
Internal error: Oops: 205 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 UID: 0 PID: 6330 Comm: syz.0.320 Not tainted 6.10.0-syzkaller #0
Hardware name: ARM-Versatile Express
PC is at path_from_stashed+0x1c/0x308 fs/libfs.c:2204
LR is at open_namespace+0x44/0xbc fs/nsfs.c:102
pc : [<8053a974>]    lr : [<8054d110>]    psr: 80000013
sp : dfa55e80  ip : 843ebc00  fp : dfa55ec4
r10: 843ebc00  r9 : 00000004  r8 : 848d80c0
r7 : 82cab250  r6 : 843ebc00  r5 : 00000000  r4 : 84df4578
r3 : dfa55ecc  r2 : 00000008  r1 : 82c99800  r0 : 00000008
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 84fdde00  DAC: 00000000
Register r0 information: non-paged memory
Register r1 information: slab kmalloc-1k start 82c99800 pointer offset 0 size 1024
Register r2 information: non-paged memory
Register r3 information: 2-page vmalloc region starting at 0xdfa54000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2781
Register r4 information: slab anon_vma_chain start 84df4578 pointer offset 0 size 40
Register r5 information: NULL pointer
Register r6 information: slab task_struct start 843ebc00 pointer offset 0 size 3072
Register r7 information: slab mnt_cache start 82cab240 pointer offset 16 size 184
Register r8 information: slab filp start 848d80c0 pointer offset 0 size 160
Register r9 information: non-paged memory
Register r10 information: slab task_struct start 843ebc00 pointer offset 0 size 3072
Register r11 information: 2-page vmalloc region starting at 0xdfa54000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2781
Register r12 information: slab task_struct start 843ebc00 pointer offset 0 size 3072
Process syz.0.320 (pid: 6330, stack limit = 0xdfa54000)
Stack: (0xdfa55e80 to 0xdfa56000)
5e80: 80552000 843ebc00 dfa55ebc dfa55e98 8027c9dc 802ac4a4 00000000 84df4578
5ea0: 00000000 843ebc00 84062c80 848d80c0 00000004 843ebc00 dfa55ef4 dfa55ec8
5ec0: 8054d110 8053a964 dfa55ef4 00000000 00000000 b5f9070d 84df4578 84df4578
5ee0: 84062400 00000008 dfa55f14 dfa55ef8 80552138 8054d0d8 0000ff08 00000000
5f00: 848d80c1 00000000 dfa55fa4 dfa55f18 8051a210 80551fc0 843ebc00 00000001
5f20: ecac8b10 843ebc00 dfa55f44 dfa55f38 8190dda0 8190dc70 dfa55f5c dfa55f48
5f40: 8024b594 8027af5c 40000000 dfa55fb0 dfa55f84 dfa55f60 80202dd8 8024b550
5f60: 8261c90c dfa55fb0 0014ab60 ecac8b10 80202cc0 b5f9070d dfa55fac 00000000
5f80: 00000000 002662dc 00000036 8020029c 843ebc00 00000036 00000000 dfa55fa8
5fa0: 80200060 8051a0e8 00000000 00000000 00000004 0000ff08 00000000 00000000
5fc0: 00000000 00000000 002662dc 00000036 7ec43766 7ec43767 003d0f00 76b400bc
5fe0: 76b3fec8 76b3feb8 00018444 001306b0 60000010 00000004 00000000 00000000
Call trace: 
[<8053a958>] (path_from_stashed) from [<8054d110>] (open_namespace+0x44/0xbc fs/nsfs.c:102)
 r10:843ebc00 r9:00000004 r8:848d80c0 r7:84062c80 r6:843ebc00 r5:00000000
 r4:84df4578
[<8054d0cc>] (open_namespace) from [<80552138>] (pidfd_ioctl+0x184/0x4c4 fs/pidfs.c:196)
 r6:00000008 r5:84062400 r4:84df4578
[<80551fb4>] (pidfd_ioctl) from [<8051a210>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<80551fb4>] (pidfd_ioctl) from [<8051a210>] (do_vfs_ioctl fs/ioctl.c:861 [inline])
[<80551fb4>] (pidfd_ioctl) from [<8051a210>] (__do_sys_ioctl fs/ioctl.c:905 [inline])
[<80551fb4>] (pidfd_ioctl) from [<8051a210>] (sys_ioctl+0x134/0xda4 fs/ioctl.c:893)
 r7:00000000 r6:848d80c1 r5:00000000 r4:0000ff08
[<8051a0dc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfa55fa8 to 0xdfa55ff0)
5fa0:                   00000000 00000000 00000004 0000ff08 00000000 00000000
5fc0: 00000000 00000000 002662dc 00000036 7ec43766 7ec43767 003d0f00 76b400bc
5fe0: 76b3fec8 76b3feb8 00018444 001306b0
 r10:00000036 r9:843ebc00 r8:8020029c r7:00000036 r6:002662dc r5:00000000
 r4:00000000
Code: e24dd01c e1a07001 e5911004 ee1dcf70 (e5905000) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	e24dd01c 	sub	sp, sp, #28
   4:	e1a07001 	mov	r7, r1
   8:	e5911004 	ldr	r1, [r1, #4]
   c:	ee1dcf70 	mrc	15, 0, ip, cr13, cr0, {3}
* 10:	e5905000 	ldr	r5, [r0] <-- trapping instruction