8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000008 when read
[00000008] *pgd=85329003, *pmd=fedd1003
Internal error: Oops: 205 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 UID: 0 PID: 3977 Comm: syz.1.79 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 : [<8053a98c>]    lr : [<8054d128>]    psr: 80000013
sp : dfaede80  ip : 845ee000  fp : dfaedec4
r10: 845ee000  r9 : 00000005  r8 : 8437f840
r7 : 82cab250  r6 : 845ee000  r5 : 00000000  r4 : 83fc5898
r3 : dfaedecc  r2 : 00000008  r1 : 82c99800  r0 : 00000008
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 84c00400  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 0xdfaec000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2781
Register r4 information: slab anon_vma_chain start 83fc5898 pointer offset 0 size 40
Register r5 information: NULL pointer
Register r6 information: slab task_struct start 845ee000 pointer offset 0 size 3072
Register r7 information: slab mnt_cache start 82cab240 pointer offset 16 size 184
Register r8 information: slab filp start 8437f840 pointer offset 0 size 160
Register r9 information: non-paged memory
Register r10 information: slab task_struct start 845ee000 pointer offset 0 size 3072
Register r11 information: 2-page vmalloc region starting at 0xdfaec000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2781
Register r12 information: slab task_struct start 845ee000 pointer offset 0 size 3072
Process syz.1.79 (pid: 3977, stack limit = 0xdfaec000)
Stack: (0xdfaede80 to 0xdfaee000)
de80: 80552018 845ee000 dfaedebc dfaede98 8027c9dc 802ac4a4 00000000 83fc5898
dea0: 00000000 845ee000 845e9480 8437f840 00000005 845ee000 dfaedef4 dfaedec8
dec0: 8054d128 8053a97c dfaedef4 00000000 00000000 35506a9f 83fc5898 83fc5898
dee0: 845e8c00 00000008 dfaedf14 dfaedef8 80552150 8054d0f0 0000ff08 00000000
df00: 8437f841 00000000 dfaedfa4 dfaedf18 8051a228 80551fd8 845ee000 00000001
df20: ecac8b10 845ee000 dfaedf44 dfaedf38 8190de40 8190dd10 dfaedf5c dfaedf48
df40: 8024b594 8027af5c 40000000 dfaedfb0 dfaedf84 dfaedf60 80202dd8 8024b550
df60: 8261c90c dfaedfb0 0014b0b0 ecac8b10 80202cc0 35506a9f dfaedfac 00000000
df80: 00000000 002662dc 00000036 8020029c 845ee000 00000036 00000000 dfaedfa8
dfa0: 80200060 8051a100 00000000 00000000 00000005 0000ff08 00000000 00000000
dfc0: 00000000 00000000 002662dc 00000036 7e884766 7e884767 003d0f00 76b5d0bc
dfe0: 76b5cec8 76b5ceb8 00018238 00130c00 60000010 00000005 00000000 00000000
Call trace: 
[<8053a970>] (path_from_stashed) from [<8054d128>] (open_namespace+0x44/0xbc fs/nsfs.c:102)
 r10:845ee000 r9:00000005 r8:8437f840 r7:845e9480 r6:845ee000 r5:00000000
 r4:83fc5898
[<8054d0e4>] (open_namespace) from [<80552150>] (pidfd_ioctl+0x184/0x4c4 fs/pidfs.c:196)
 r6:00000008 r5:845e8c00 r4:83fc5898
[<80551fcc>] (pidfd_ioctl) from [<8051a228>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<80551fcc>] (pidfd_ioctl) from [<8051a228>] (do_vfs_ioctl fs/ioctl.c:861 [inline])
[<80551fcc>] (pidfd_ioctl) from [<8051a228>] (__do_sys_ioctl fs/ioctl.c:905 [inline])
[<80551fcc>] (pidfd_ioctl) from [<8051a228>] (sys_ioctl+0x134/0xda4 fs/ioctl.c:893)
 r7:00000000 r6:8437f841 r5:00000000 r4:0000ff08
[<8051a0f4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfaedfa8 to 0xdfaedff0)
dfa0:                   00000000 00000000 00000005 0000ff08 00000000 00000000
dfc0: 00000000 00000000 002662dc 00000036 7e884766 7e884767 003d0f00 76b5d0bc
dfe0: 76b5cec8 76b5ceb8 00018238 00130c00
 r10:00000036 r9:845ee000 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