[syzbot] [mm?] general protection fault in __pte_offset_map_lock

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    6a71d2909427 Merge branch 'for-next/core' into for-kernelci
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=12fa897f180000
kernel config:  https://syzkaller.appspot.com/x/.config?x=fca646cf17cc616b
dashboard link: https://syzkaller.appspot.com/bug?extid=f96e045d95fe10c0e800
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=159169df180000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15396354980000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c77d21fa1405/disk-6a71d290.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/429fcd369816/vmlinux-6a71d290.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d3d8a4b85112/Image-6a71d290.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+f96e045d95fe10c0e800@xxxxxxxxxxxxxxxxxxxxxxxxx

Unable to handle kernel paging request at virtual address ffff7fbff7e00005
KASAN: probably wild-memory-access in range [0xfffffdffbf000028-0xfffffdffbf00002f]
Mem abort info:
  ESR = 0x0000000096000007
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x07: level 3 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000007, ISS2 = 0x00000000
  CM = 0, WnR = 0, TnD = 0, TagAccess = 0
  GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001ad5bd000
[ffff7fbff7e00005] pgd=0000000000000000, p4d=1000000233f68003, pud=1000000233f67003, pmd=1000000233f66003, pte=0000000000000000
Internal error: Oops: 0000000096000007 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 9675 Comm: syz-executor299 Not tainted 6.9.0-rc4-syzkaller-g6a71d2909427 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
pstate: 80401005 (Nzcv daif +PAN -UAO -TCO -DIT +SSBS BTYPE=--)
pc : ptlock_ptr include/linux/mm.h:2889 [inline]
pc : pte_lockptr include/linux/mm.h:2913 [inline]
pc : __pte_offset_map_lock+0x15c/0x2ac mm/pgtable-generic.c:372
lr : __pte_offset_map_lock+0xe0/0x2ac
sp : ffff80009ff26ea0
x29: ffff80009ff26f60 x28: fffeffffc0000000 x27: 0000000020e00000
x26: fffffdffbf000028 x25: ffff700013fe4ddc x24: ffff80009ff26f00
x23: 1ffff00013fe4de4 x22: ffff80009ff26f20 x21: ffff0000d0854838
x20: dfff800000000000 x19: 0000000000000000 x18: 1fffe00018c6a29c
x17: ffff80008ee7d000 x16: ffff80008ae725bc x15: 0000000000000002
x14: ffff80008ee80668 x13: dfff800000000000 x12: 00000000afeb9c68
x11: 1fffe0001a10a907 x10: ffffc1ffc0000000 x9 : 0000000000000000
x8 : 1fffffbff7e00005 x7 : ffff800080952aac x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000002
x2 : 0000000000000008 x1 : 0000000000000000 x0 : ffff80008e8179a0
Call trace:
 ptlock_ptr include/linux/mm.h:2889 [inline]
 pte_lockptr include/linux/mm.h:2913 [inline]
 __pte_offset_map_lock+0x15c/0x2ac mm/pgtable-generic.c:372
 pte_offset_map_lock include/linux/mm.h:2978 [inline]
 zap_pte_range mm/memory.c:1584 [inline]
 zap_pmd_range mm/memory.c:1722 [inline]
 zap_pud_range mm/memory.c:1751 [inline]
 zap_p4d_range mm/memory.c:1772 [inline]
 unmap_page_range+0x8a8/0x2f5c mm/memory.c:1793
 unmap_single_vma mm/memory.c:1839 [inline]
 unmap_vmas+0x378/0x598 mm/memory.c:1883
 exit_mmap+0x214/0xd74 mm/mmap.c:3267
 __mmput+0xec/0x390 kernel/fork.c:1345
 mmput+0x70/0xac kernel/fork.c:1367
 exit_mm+0x148/0x210 kernel/exit.c:569
 do_exit+0x468/0x1ac8 kernel/exit.c:865
 do_group_exit+0x194/0x22c kernel/exit.c:1027
 get_signal+0x1414/0x1530 kernel/signal.c:2911
 do_signal+0x238/0x3e8c arch/arm64/kernel/signal.c:1308
 do_notify_resume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148
 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline]
 el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:713
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598
Code: aa09a908 8b481b48 9100a11a d343ff48 (38746908) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	aa09a908 	orr	x8, x8, x9, lsl #42
   4:	8b481b48 	add	x8, x26, x8, lsr #6
   8:	9100a11a 	add	x26, x8, #0x28
   c:	d343ff48 	lsr	x8, x26, #3
* 10:	38746908 	ldrb	w8, [x8, x20] <-- trapping instruction


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