8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000008 when read
[00000008] *pgd=8515f003, *pmd=fe4ff003
Internal error: Oops: 205 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 UID: 0 PID: 4249 Comm: syz.0.119 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 : dfb21e80  ip : 8451a400  fp : dfb21ec4
r10: 8451a400  r9 : 00000005  r8 : 8435c300
r7 : 82cab250  r6 : 8451a400  r5 : 00000000  r4 : 82ccf870
r3 : dfb21ecc  r2 : 00000008  r1 : 82c99800  r0 : 00000008
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 84bccc80  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 0xdfb20000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2781
Register r4 information: slab anon_vma_chain start 82ccf870 pointer offset 0 size 40
Register r5 information: NULL pointer
Register r6 information: slab task_struct start 8451a400 pointer offset 0 size 3072
Register r7 information: slab mnt_cache start 82cab240 pointer offset 16 size 184
Register r8 information: slab filp start 8435c300 pointer offset 0 size 160
Register r9 information: non-paged memory
Register r10 information: slab task_struct start 8451a400 pointer offset 0 size 3072
Register r11 information: 2-page vmalloc region starting at 0xdfb20000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2781
Register r12 information: slab task_struct start 8451a400 pointer offset 0 size 3072
Process syz.0.119 (pid: 4249, stack limit = 0xdfb20000)
Stack: (0xdfb21e80 to 0xdfb22000)
1e80: 80552018 8451a400 dfb21ebc dfb21e98 8027c9dc 802ac4a4 00000000 82ccf870
1ea0: 00000000 8451a400 8490a080 8435c300 00000005 8451a400 dfb21ef4 dfb21ec8
1ec0: 8054d128 8053a97c dfb21ef4 00000000 00000000 b92da1f6 82ccf870 82ccf870
1ee0: 84909800 00000008 dfb21f14 dfb21ef8 80552150 8054d0f0 0000ff08 00000000
1f00: 8435c301 00000000 dfb21fa4 dfb21f18 8051a228 80551fd8 8451a400 00000001
1f20: ecac8b10 8451a400 dfb21f44 dfb21f38 8190de40 8190dd10 dfb21f5c dfb21f48
1f40: 8024b594 8027af5c 40000000 dfb21fb0 dfb21f84 dfb21f60 80202dd8 8024b550
1f60: 8261c90c dfb21fb0 0014b0b0 ecac8b10 80202cc0 b92da1f6 dfb21fac 00000000
1f80: 00000000 002662dc 00000036 8020029c 8451a400 00000036 00000000 dfb21fa8
1fa0: 80200060 8051a100 00000000 00000000 00000005 0000ff08 00000000 00000000
1fc0: 00000000 00000000 002662dc 00000036 7e8eb766 7e8eb767 003d0f00 76bc90bc
1fe0: 76bc8ec8 76bc8eb8 00018238 00130c00 60000010 00000005 00000000 00000000
Call trace: 
[<8053a970>] (path_from_stashed) from [<8054d128>] (open_namespace+0x44/0xbc fs/nsfs.c:102)
 r10:8451a400 r9:00000005 r8:8435c300 r7:8490a080 r6:8451a400 r5:00000000
 r4:82ccf870
[<8054d0e4>] (open_namespace) from [<80552150>] (pidfd_ioctl+0x184/0x4c4 fs/pidfs.c:196)
 r6:00000008 r5:84909800 r4:82ccf870
[<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 r6:8435c301 r5:00000000 r4:0000ff08
[<8051a0f4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfb21fa8 to 0xdfb21ff0)
1fa0:                   00000000 00000000 00000005 0000ff08 00000000 00000000
1fc0: 00000000 00000000 002662dc 00000036 7e8eb766 7e8eb767 003d0f00 76bc90bc
1fe0: 76bc8ec8 76bc8eb8 00018238 00130c00
 r10:00000036 r9:8451a400 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