8<--- cut here ---
Unable to handle kernel NULL pointer dereference at virtual address 00000008 when read
[00000008] *pgd=847cd003, *pmd=fe51e003
Internal error: Oops: 205 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 1 PID: 12295 Comm: syz.1.1918 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 : dfb75e80  ip : 84ccec00  fp : dfb75ec4
r10: 84ccec00  r9 : 00000003  r8 : 846b5240
r7 : 82caa250  r6 : 84ccec00  r5 : 00000000  r4 : 84cee578
r3 : dfb75ecc  r2 : 00000008  r1 : 82c95800  r0 : 00000008
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 30c5387d  Table: 85101540  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 0xdfb74000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2780
Register r4 information: slab anon_vma_chain start 84cee578 pointer offset 0 size 40
Register r5 information: NULL pointer
Register r6 information: slab task_struct start 84ccec00 pointer offset 0 size 3072
Register r7 information: slab mnt_cache start 82caa240 pointer offset 16 size 184
Register r8 information: slab filp start 846b5240 pointer offset 0 size 160
Register r9 information: non-paged memory
Register r10 information: slab task_struct start 84ccec00 pointer offset 0 size 3072
Register r11 information: 2-page vmalloc region starting at 0xdfb74000 allocated at kernel_clone+0xac/0x3e4 kernel/fork.c:2780
Register r12 information: slab task_struct start 84ccec00 pointer offset 0 size 3072
Process syz.1.1918 (pid: 12295, stack limit = 0xdfb74000)
Stack: (0xdfb75e80 to 0xdfb76000)
5e80: 84ccbc00 00000008 dfb75eb4 dfb75e98 806e6544 804065ac 00000009 84cee578
5ea0: 00000000 84ccec00 84ccc480 846b5240 00000003 84ccec00 dfb75ef4 dfb75ec8
5ec0: 8054d6f8 8053af44 dfb75ef4 00000000 00000000 8d5f3a89 84cee578 84cee578
5ee0: 84ccbc00 00000008 dfb75f14 dfb75ef8 8055271c 8054d6c0 0000ff07 00000000
5f00: 846b5241 00000000 dfb75fa4 dfb75f18 8051a7f0 805525a4 84ccec00 00000001
5f20: ecac8b10 84ccec00 dfb75f44 dfb75f38 81903eac 81903d7c dfb75f5c dfb75f48
5f40: 8024b544 8027aebc 40000000 dfb75fb0 dfb75f84 dfb75f60 80202dd8 8024b500
5f60: 8261c90c dfb75fb0 0014aa30 ecac8b10 80202cc0 8d5f3a89 dfb75fac 00000000
5f80: 00000000 002642dc 00000036 8020029c 84ccec00 00000036 00000000 dfb75fa8
5fa0: 80200060 8051a6c8 00000000 00000000 00000003 0000ff07 00000000 00000000
5fc0: 00000000 00000000 002642dc 00000036 7e8a8766 7e8a8767 003d0f00 76b800bc
5fe0: 76b7fec8 76b7feb8 000183ec 00130580 60000010 00000003 00000000 00000000
Call trace: 
[<8053af38>] (path_from_stashed) from [<8054d6f8>] (open_namespace+0x44/0xbc fs/nsfs.c:102)
 r10:84ccec00 r9:00000003 r8:846b5240 r7:84ccc480 r6:84ccec00 r5:00000000
 r4:84cee578
[<8054d6b4>] (open_namespace) from [<8055271c>] (pidfd_ioctl+0x184/0x4c4 fs/pidfs.c:196)
 r6:00000008 r5:84ccbc00 r4:84cee578
[<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 r6:846b5241 r5:00000000 r4:0000ff07
[<8051a6bc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67)
Exception stack(0xdfb75fa8 to 0xdfb75ff0)
5fa0:                   00000000 00000000 00000003 0000ff07 00000000 00000000
5fc0: 00000000 00000000 002642dc 00000036 7e8a8766 7e8a8767 003d0f00 76b800bc
5fe0: 76b7fec8 76b7feb8 000183ec 00130580
 r10:00000036 r9:84ccec00 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