Unable to handle kernel paging request at virtual address dfff800000000001
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
Mem abort info:
  ESR = 0x0000000096000006
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x06: level 2 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000006
  CM = 0, WnR = 0
[dfff800000000001] address between user and kernel address ranges
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 6669 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
pstate: 02400005 (nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : PageTail include/linux/page-flags.h:292 [inline]
pc : folio_flags include/linux/page-flags.h:319 [inline]
pc : folio_test_uptodate include/linux/page-flags.h:719 [inline]
pc : ext4_mb_load_buddy_gfp+0x21c/0xec0 fs/ext4/mballoc.c:1536
lr : ext4_mb_load_buddy_gfp+0x1e8/0xec0 fs/ext4/mballoc.c:1535
sp : ffff800022d66fc0
x29: ffff800022d67020 x28: 1ffff000045ace3c x27: dfff800000000000
x26: 0000000000000008 x25: 0000000000000000 x24: ffff0000d90196f0
x23: ffff0000d90196c0 x22: 0000000000000000 x21: 0000000000000001
x20: 1ffff000045ace3c x19: ffff800022d671d0 x18: 1fffe00033c2597e
x17: ffff8000163dd000 x16: ffff800011ba16d0 x15: 0000000000000000
x14: 0000000000000406 x13: 0000000000ff0100 x12: ffff800016647a88
x11: ff008000086f8b74 x10: 0000000000000000 x9 : 1eb27a788c2df000
x8 : 1eb27a788c2df000 x7 : ffff800008704dd0 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000008 x1 : 0000000000000000 x0 : 0000000000000000
Call trace:
 PageTail include/linux/page-flags.h:-1 [inline]
 folio_flags include/linux/page-flags.h:319 [inline]
 folio_test_uptodate include/linux/page-flags.h:719 [inline]
 ext4_mb_load_buddy_gfp+0x21c/0xec0 fs/ext4/mballoc.c:1536
 ext4_mb_load_buddy fs/ext4/mballoc.c:1641 [inline]
 ext4_mb_regular_allocator+0xfb4/0x2b60 fs/ext4/mballoc.c:2798
 ext4_mb_new_blocks+0xb78/0x4244 fs/ext4/mballoc.c:5793
 ext4_ext_map_blocks+0x12bc/0x5680 fs/ext4/extents.c:4369
 ext4_map_blocks+0x7b0/0x160c fs/ext4/inode.c:681
 ext4_getblk+0x178/0x680 fs/ext4/inode.c:892
 ext4_bread+0x3c/0x1a8 fs/ext4/inode.c:948
 ext4_append+0x23c/0x488 fs/ext4/namei.c:83
 ext4_init_new_dir+0x270/0x4f0 fs/ext4/namei.c:3032
 ext4_mkdir+0x3b8/0xa28 fs/ext4/namei.c:3078
 vfs_mkdir+0x314/0x4d8 fs/namei.c:4161
 do_mkdirat+0x1b8/0x3ec fs/namei.c:4186
 __do_sys_mkdirat fs/namei.c:4201 [inline]
 __se_sys_mkdirat fs/namei.c:4199 [inline]
 __arm64_sys_mkdirat+0x90/0xa8 fs/namei.c:4199
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x12c arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:589
Code: aa0003f6 d343ff55 f9000ff4 aa1c03f4 (387b6aa8) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	aa0003f6 	mov	x22, x0
   4:	d343ff55 	lsr	x21, x26, #3
   8:	f9000ff4 	str	x20, [sp, #24]
   c:	aa1c03f4 	mov	x20, x28
* 10:	387b6aa8 	ldrb	w8, [x21, x27] <-- trapping instruction