8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000008 when read
[00000008] *pgd=85346003, *pmd=fed4c003
Internal error: Oops: 205 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 4909 Comm: syz.0.126 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 : [<8053b05c>]    lr : [<8054d800>]    psr: 80000013
sp : dfae5e80  ip : 837dc800  fp : dfae5ec4
r10: 837dc800  r9 : 00000003  r8 : 84a4d0c0
r7 : 82caa250  r6 : 837dc800  r5 : 00000000  r4 : 85197bb8
r3 : dfae5ecc  r2 : 00000008  r1 : 82c95800  r0 : 00000008
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 8538edc0  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 0xdfae4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2780
Register r4 information: slab anon_vma_chain start 85197bb8 pointer offset 0 size 40
Register r5 information: NULL pointer
Register r6 information: slab task_struct start 837dc800 pointer offset 0 size 3072
Register r7 information: slab mnt_cache start 82caa240 pointer offset 16 size 184
Register r8 information: slab filp start 84a4d0c0 pointer offset 0 size 160
Register r9 information: non-paged memory
Register r10 information: slab task_struct start 837dc800 pointer offset 0 size 3072
Register r11 information: 2-page vmalloc region starting at 0xdfae4000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2780
Register r12 information: slab task_struct start 837dc800 pointer offset 0 size 3072
Process syz.0.126 (pid: 4909, stack limit = 0xdfae4000)
Stack: (0xdfae5e80 to 0xdfae6000)
5e80: 837da400 00000008 dfae5eb4 dfae5e98 806e6a64 804065ac 00000009 85197bb8
5ea0: 00000000 837dc800 837dac80 84a4d0c0 00000003 837dc800 dfae5ef4 dfae5ec8
5ec0: 8054d800 8053b04c dfae5ef4 00000000 00000000 8dfedb04 85197bb8 85197bb8
5ee0: 837da400 00000008 dfae5f14 dfae5ef8 80552824 8054d7c8 0000ff07 00000000
5f00: 84a4d0c1 00000000 dfae5fa4 dfae5f18 8051a8f8 805526ac 837dc800 00000001
5f20: ecac8b10 837dc800 dfae5f44 dfae5f38 8190639c 8190626c dfae5f5c dfae5f48
5f40: 8024b544 8027aebc 40000000 dfae5fb0 dfae5f84 dfae5f60 80202dd8 8024b500
5f60: 8261c90c dfae5fb0 0014ab60 ecac8b10 80202cc0 8dfedb04 dfae5fac 00000000
5f80: 00000000 002662dc 00000036 8020029c 837dc800 00000036 00000000 dfae5fa8
5fa0: 80200060 8051a7d0 00000000 00000000 00000003 0000ff07 00000000 00000000
5fc0: 00000000 00000000 002662dc 00000036 7ef17766 7ef17767 003d0f00 76b420bc
5fe0: 76b41ec8 76b41eb8 00018444 001306b0 60000010 00000003 00000000 00000000
Call trace: 
[<8053b040>] (path_from_stashed) from [<8054d800>] (open_namespace+0x44/0xbc fs/nsfs.c:102)
 r10:837dc800 r9:00000003 r8:84a4d0c0 r7:837dac80 r6:837dc800 r5:00000000
 r4:85197bb8
[<8054d7bc>] (open_namespace) from [<80552824>] (pidfd_ioctl+0x184/0x4c4 fs/pidfs.c:196)
 r6:00000008 r5:837da400 r4:85197bb8
[<805526a0>] (pidfd_ioctl) from [<8051a8f8>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<805526a0>] (pidfd_ioctl) from [<8051a8f8>] (do_vfs_ioctl fs/ioctl.c:861 [inline])
[<805526a0>] (pidfd_ioctl) from [<8051a8f8>] (__do_sys_ioctl fs/ioctl.c:905 [inline])
[<805526a0>] (pidfd_ioctl) from [<8051a8f8>] (sys_ioctl+0x134/0xda4 fs/ioctl.c:893)
 r7:00000000 r6:84a4d0c1 r5:00000000 r4:0000ff07
[<8051a7c4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfae5fa8 to 0xdfae5ff0)
5fa0:                   00000000 00000000 00000003 0000ff07 00000000 00000000
5fc0: 00000000 00000000 002662dc 00000036 7ef17766 7ef17767 003d0f00 76b420bc
5fe0: 76b41ec8 76b41eb8 00018444 001306b0
 r10:00000036 r9:837dc800 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