8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000008 when read
[00000008] *pgd=8528a003, *pmd=fee7f003
Internal error: Oops: 205 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 5314 Comm: syz.1.237 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 : dfa85e80  ip : 836e6c00  fp : dfa85ec4
r10: 836e6c00  r9 : 00000005  r8 : 8422ae40
r7 : 82caa250  r6 : 836e6c00  r5 : 00000000  r4 : 84412f50
r3 : dfa85ecc  r2 : 00000008  r1 : 82c95800  r0 : 00000008
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 8461dec0  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 0xdfa84000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2780
Register r4 information: slab anon_vma_chain start 84412f50 pointer offset 0 size 40
Register r5 information: NULL pointer
Register r6 information: slab task_struct start 836e6c00 pointer offset 0 size 3072
Register r7 information: slab mnt_cache start 82caa240 pointer offset 16 size 184
Register r8 information: slab filp start 8422ae40 pointer offset 0 size 160
Register r9 information: non-paged memory
Register r10 information: slab task_struct start 836e6c00 pointer offset 0 size 3072
Register r11 information: 2-page vmalloc region starting at 0xdfa84000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2780
Register r12 information: slab task_struct start 836e6c00 pointer offset 0 size 3072
Process syz.1.237 (pid: 5314, stack limit = 0xdfa84000)
Stack: (0xdfa85e80 to 0xdfa86000)
5e80: 805525e4 836e6c00 dfa85ebc dfa85e98 8027c93c 802ac404 00000000 84412f50
5ea0: 00000000 836e6c00 83cbf480 8422ae40 00000005 836e6c00 dfa85ef4 dfa85ec8
5ec0: 8054d6f8 8053af44 dfa85ef4 00000000 00000000 b8a6f9fc 84412f50 84412f50
5ee0: 83cbec00 00000008 dfa85f14 dfa85ef8 8055271c 8054d6c0 0000ff08 00000000
5f00: 8422ae41 00000000 dfa85fa4 dfa85f18 8051a7f0 805525a4 836e6c00 00000001
5f20: ecac8b10 836e6c00 dfa85f44 dfa85f38 81903eac 81903d7c dfa85f5c dfa85f48
5f40: 8024b544 8027aebc 40000000 dfa85fb0 dfa85f84 dfa85f60 80202dd8 8024b500
5f60: 8261c90c dfa85fb0 0014aa30 ecac8b10 80202cc0 b8a6f9fc dfa85fac 00000000
5f80: 00000000 002642e0 00000036 8020029c 836e6c00 00000036 00000000 dfa85fa8
5fa0: 80200060 8051a6c8 00000000 00000000 00000005 0000ff08 00000000 00000000
5fc0: 00000000 00000000 002642e0 00000036 7e948766 7e948767 003d0f00 76be00bc
5fe0: 76bdfec8 76bdfeb8 000183ec 00130580 60000010 00000005 00000000 00000000
Call trace: 
[<8053af38>] (path_from_stashed) from [<8054d6f8>] (open_namespace+0x44/0xbc fs/nsfs.c:102)
 r10:836e6c00 r9:00000005 r8:8422ae40 r7:83cbf480 r6:836e6c00 r5:00000000
 r4:84412f50
[<8054d6b4>] (open_namespace) from [<8055271c>] (pidfd_ioctl+0x184/0x4c4 fs/pidfs.c:196)
 r6:00000008 r5:83cbec00 r4:84412f50
[<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 r6:8422ae41 r5:00000000 r4:0000ff08
[<8051a6bc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfa85fa8 to 0xdfa85ff0)
5fa0:                   00000000 00000000 00000005 0000ff08 00000000 00000000
5fc0: 00000000 00000000 002642e0 00000036 7e948766 7e948767 003d0f00 76be00bc
5fe0: 76bdfec8 76bdfeb8 000183ec 00130580
 r10:00000036 r9:836e6c00 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