8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000008 when read
[00000008] *pgd=85223003, *pmd=fe05f003
Internal error: Oops: 205 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 5199 Comm: syz.0.397 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 : [<80539bb4>]    lr : [<8054c358>]    psr: 80000013
sp : dfbe1e80  ip : 84df0c00  fp : dfbe1ec4
r10: 84df0c00  r9 : 00000003  r8 : 84642840
r7 : 82caa250  r6 : 84df0c00  r5 : 00000000  r4 : 845a5b68
r3 : dfbe1ecc  r2 : 00000008  r1 : 82c95800  r0 : 00000008
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 30c5387d  Table: 854979c0  DAC: fffffffd
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 0xdfbe0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2777
Register r4 information: slab anon_vma_chain start 845a5b68 pointer offset 0 size 40
Register r5 information: NULL pointer
Register r6 information: slab task_struct start 84df0c00 pointer offset 0 size 3072
Register r7 information: slab mnt_cache start 82caa240 pointer offset 16 size 184
Register r8 information: slab filp start 84642840 pointer offset 0 size 160
Register r9 information: non-paged memory
Register r10 information: slab task_struct start 84df0c00 pointer offset 0 size 3072
Register r11 information: 2-page vmalloc region starting at 0xdfbe0000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2777
Register r12 information: slab task_struct start 84df0c00 pointer offset 0 size 3072
Process syz.0.397 (pid: 5199, stack limit = 0xdfbe0000)
Stack: (0xdfbe1e80 to 0xdfbe2000)
1e80: 80551244 84df0c00 dfbe1ebc dfbe1e98 8027ca9c 802ac75c 00000000 845a5b68
1ea0: 00000000 84df0c00 835b5080 84642840 00000003 84df0c00 dfbe1ef4 dfbe1ec8
1ec0: 8054c358 80539ba4 dfbe1ef4 00000000 00000000 152f251c 845a5b68 845a5b68
1ee0: 835b4800 00000008 dfbe1f14 dfbe1ef8 8055137c 8054c320 0000ff07 00000000
1f00: 84642841 00000000 dfbe1fa4 dfbe1f18 80519474 80551204 84df0c00 00000001
1f20: ecac8b10 84df0c00 dfbe1f44 dfbe1f38 818f6ee0 818f6db0 dfbe1f5c dfbe1f48
1f40: 8024b7e4 8027b09c 40000000 dfbe1fb0 dfbe1f84 dfbe1f60 80202dc4 8024b7a0
1f60: 8261c90c dfbe1fb0 0014a9d0 ecac8b10 80202cac 152f251c dfbe1fac 00000000
1f80: 00000000 002642dc 00000036 8020029c 84df0c00 00000036 00000000 dfbe1fa8
1fa0: 80200060 8051934c 00000000 00000000 00000003 0000ff07 00000000 00000000
1fc0: 00000000 00000000 002642dc 00000036 7ec77766 7ec77767 003d0f00 76b9a0bc
1fe0: 76b99ec8 76b99eb8 00018394 00130520 60000010 00000003 00000000 00000000
Call trace: 
[<80539b98>] (path_from_stashed) from [<8054c358>] (open_namespace+0x44/0xbc fs/nsfs.c:102)
 r10:84df0c00 r9:00000003 r8:84642840 r7:835b5080 r6:84df0c00 r5:00000000
 r4:845a5b68
[<8054c314>] (open_namespace) from [<8055137c>] (pidfd_ioctl+0x184/0x4c4 fs/pidfs.c:196)
 r6:00000008 r5:835b4800 r4:845a5b68
[<805511f8>] (pidfd_ioctl) from [<80519474>] (vfs_ioctl fs/ioctl.c:51 [inline])
[<805511f8>] (pidfd_ioctl) from [<80519474>] (do_vfs_ioctl fs/ioctl.c:861 [inline])
[<805511f8>] (pidfd_ioctl) from [<80519474>] (__do_sys_ioctl fs/ioctl.c:905 [inline])
[<805511f8>] (pidfd_ioctl) from [<80519474>] (sys_ioctl+0x134/0xda4 fs/ioctl.c:893)
 r7:00000000 r6:84642841 r5:00000000 r4:0000ff07
[<80519340>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfbe1fa8 to 0xdfbe1ff0)
1fa0:                   00000000 00000000 00000003 0000ff07 00000000 00000000
1fc0: 00000000 00000000 002642dc 00000036 7ec77766 7ec77767 003d0f00 76b9a0bc
1fe0: 76b99ec8 76b99eb8 00018394 00130520
 r10:00000036 r9:84df0c00 r8:8020029c r7:00000036 r6:002642dc 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