8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000008 when read
[00000008] *pgd=852ba003, *pmd=fe575003
Internal error: Oops: 205 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 UID: 0 PID: 7667 Comm: syz.1.882 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 : [<8053a94c>]    lr : [<8054d0e8>]    psr: 80000013
sp : e0331e80  ip : 85008c00  fp : e0331ec4
r10: 85008c00  r9 : 00000005  r8 : 84dc7780
r7 : 82cab250  r6 : 85008c00  r5 : 00000000  r4 : 84396de8
r3 : e0331ecc  r2 : 00000008  r1 : 82c99800  r0 : 00000008
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 84170900  DAC: fffffffd
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 0xe0330000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2781
Register r4 information: slab anon_vma_chain start 84396de8 pointer offset 0 size 40
Register r5 information: NULL pointer
Register r6 information: slab task_struct start 85008c00 pointer offset 0 size 3072
Register r7 information: slab mnt_cache start 82cab240 pointer offset 16 size 184
Register r8 information: slab filp start 84dc7780 pointer offset 0 size 160
Register r9 information: non-paged memory
Register r10 information: slab task_struct start 85008c00 pointer offset 0 size 3072
Register r11 information: 2-page vmalloc region starting at 0xe0330000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2781
Register r12 information: slab task_struct start 85008c00 pointer offset 0 size 3072
Process syz.1.882 (pid: 7667, stack limit = 0xe0330000)
Stack: (0xe0331e80 to 0xe0332000)
1e80: 80551fd8 85008c00 e0331ebc e0331e98 8027c9dc 802ac4a4 00000000 84396de8
1ea0: 00000000 85008c00 8500e880 84dc7780 00000005 85008c00 e0331ef4 e0331ec8
1ec0: 8054d0e8 8053a93c e0331ef4 00000000 00000000 85822929 84396de8 84396de8
1ee0: 8500e000 00000008 e0331f14 e0331ef8 80552110 8054d0b0 0000ff07 00000000
1f00: 84dc7780 00000000 e0331fa4 e0331f18 8051a1e8 80551f98 85008c00 00000001
1f20: ecac8b10 85008c00 e0331f44 e0331f38 8190dd14 8190dbe4 e0331f5c e0331f48
1f40: 8024b594 8027af5c 40000000 e0331fb0 e0331f84 e0331f60 80202dd8 8024b550
1f60: 8261c90c e0331fb0 0014b0d0 ecac8b10 80202cc0 85822929 e0331fac 00000000
1f80: 00000000 002662e0 00000036 8020029c 85008c00 00000036 00000000 e0331fa8
1fa0: 80200060 8051a0c0 00000000 00000000 00000005 0000ff07 00000000 00000000
1fc0: 00000000 00000000 002662e0 00000036 7efda766 7efda767 003d0f00 76bcc0bc
1fe0: 76bcbec8 76bcbeb8 00018258 00130c20 60000010 00000005 00000000 00000000
Call trace: 
[<8053a930>] (path_from_stashed) from [<8054d0e8>] (open_namespace+0x44/0xbc fs/nsfs.c:102)
 r10:85008c00 r9:00000005 r8:84dc7780 r7:8500e880 r6:85008c00 r5:00000000
 r4:84396de8
[<8054d0a4>] (open_namespace) from [<80552110>] (pidfd_ioctl+0x184/0x4c4 fs/pidfs.c:196)
 r6:00000008 r5:8500e000 r4:84396de8
[<80551f8c>] (pidfd_ioctl) from [<8051a1e8>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<80551f8c>] (pidfd_ioctl) from [<8051a1e8>] (do_vfs_ioctl fs/ioctl.c:861 [inline])
[<80551f8c>] (pidfd_ioctl) from [<8051a1e8>] (__do_sys_ioctl fs/ioctl.c:905 [inline])
[<80551f8c>] (pidfd_ioctl) from [<8051a1e8>] (sys_ioctl+0x134/0xda4 fs/ioctl.c:893)
 r7:00000000 r6:84dc7780 r5:00000000 r4:0000ff07
[<8051a0b4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xe0331fa8 to 0xe0331ff0)
1fa0:                   00000000 00000000 00000005 0000ff07 00000000 00000000
1fc0: 00000000 00000000 002662e0 00000036 7efda766 7efda767 003d0f00 76bcc0bc
1fe0: 76bcbec8 76bcbeb8 00018258 00130c20
 r10:00000036 r9:85008c00 r8:8020029c r7:00000036 r6:002662e0 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