8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000008 when read
[00000008] *pgd=85042003, *pmd=fe768003
Internal error: Oops: 205 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 5981 Comm: syz.1.508 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 : [<8053af54>]    lr : [<8054d6f8>]    psr: 80000013
sp : df98de80  ip : 85566000  fp : df98dec4
r10: 85566000  r9 : 00000005  r8 : 850e56c0
r7 : 82caa250  r6 : 85566000  r5 : 00000000  r4 : 84c22078
r3 : df98decc  r2 : 00000008  r1 : 82c95800  r0 : 00000008
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 84e3c180  DAC: 00000000
Register r0 information: non-paged memory
Register r1 information: slab kmalloc-1k start 82c95800 pointer offset 0 size 1024
Register r2 information: non-paged memory
Register r3 information: 2-page vmalloc region starting at 0xdf98c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2780
Register r4 information: slab anon_vma_chain start 84c22078 pointer offset 0 size 40
Register r5 information: NULL pointer
Register r6 information: slab task_struct start 85566000 pointer offset 0 size 3072
Register r7 information: slab mnt_cache start 82caa240 pointer offset 16 size 184
Register r8 information: slab filp start 850e56c0 pointer offset 0 size 160
Register r9 information: non-paged memory
Register r10 information: slab task_struct start 85566000 pointer offset 0 size 3072
Register r11 information: 2-page vmalloc region starting at 0xdf98c000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2780
Register r12 information: slab task_struct start 85566000 pointer offset 0 size 3072
Process syz.1.508 (pid: 5981, stack limit = 0xdf98c000)
Stack: (0xdf98de80 to 0xdf98e000)
de80: 805525e4 85566000 df98debc df98de98 8027c93c 802ac404 00000000 84c22078
dea0: 00000000 85566000 85560880 850e56c0 00000005 85566000 df98def4 df98dec8
dec0: 8054d6f8 8053af44 df98def4 00000000 00000000 1e0c4c21 84c22078 84c22078
dee0: 85560000 00000008 df98df14 df98def8 8055271c 8054d6c0 0000ff07 00000000
df00: 850e56c1 00000000 df98dfa4 df98df18 8051a7f0 805525a4 85566000 00000001
df20: ecac8b10 85566000 df98df44 df98df38 81903eac 81903d7c df98df5c df98df48
df40: 8024b544 8027aebc 40000000 df98dfb0 df98df84 df98df60 80202dd8 8024b500
df60: 8261c90c df98dfb0 0014aa30 ecac8b10 80202cc0 1e0c4c21 df98dfac 00000000
df80: 00000000 002642e0 00000036 8020029c 85566000 00000036 00000000 df98dfa8
dfa0: 80200060 8051a6c8 00000000 00000000 00000005 0000ff07 00000000 00000000
dfc0: 00000000 00000000 002642e0 00000036 7ea65766 7ea65767 003d0f00 76bf80bc
dfe0: 76bf7ec8 76bf7eb8 000183ec 00130580 60000010 00000005 00000000 00000000
Call trace: 
[<8053af38>] (path_from_stashed) from [<8054d6f8>] (open_namespace+0x44/0xbc fs/nsfs.c:102)
 r10:85566000 r9:00000005 r8:850e56c0 r7:85560880 r6:85566000 r5:00000000
 r4:84c22078
[<8054d6b4>] (open_namespace) from [<8055271c>] (pidfd_ioctl+0x184/0x4c4 fs/pidfs.c:196)
 r6:00000008 r5:85560000 r4:84c22078
[<80552598>] (pidfd_ioctl) from [<8051a7f0>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<80552598>] (pidfd_ioctl) from [<8051a7f0>] (do_vfs_ioctl fs/ioctl.c:861 [inline])
[<80552598>] (pidfd_ioctl) from [<8051a7f0>] (__do_sys_ioctl fs/ioctl.c:905 [inline])
[<80552598>] (pidfd_ioctl) from [<8051a7f0>] (sys_ioctl+0x134/0xda4 fs/ioctl.c:893)
 r7:00000000 r6:850e56c1 r5:00000000 r4:0000ff07
[<8051a6bc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdf98dfa8 to 0xdf98dff0)
dfa0:                   00000000 00000000 00000005 0000ff07 00000000 00000000
dfc0: 00000000 00000000 002642e0 00000036 7ea65766 7ea65767 003d0f00 76bf80bc
dfe0: 76bf7ec8 76bf7eb8 000183ec 00130580
 r10:00000036 r9:85566000 r8:8020029c r7:00000036 r6:002642e0 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