[syzbot] [arm?] BUG: unable to handle kernel paging request in huge_pte_alloc

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 2c71fdf02a95 Merge tag 'drm-fixes-2024-04-09' of https://g..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16b397ad180000
kernel config: https://syzkaller.appspot.com/x/.config?x=3b59c588989b5f9a
dashboard link: https://syzkaller.appspot.com/bug?extid=8b093786303cd0c2041d
compiler: aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16f55d29180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a32e75180000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-2c71fdf0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/627c4a5b3fcb/vmlinux-2c71fdf0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/39628cd13511/Image-2c71fdf0.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8b0937...@syzkaller.appspotmail.com

Unable to handle kernel paging request at virtual address ffffffffc0000000
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, ISS2 = 0x00000000
CM = 0, WnR = 0, TnD = 0, TagAccess = 0
GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
swapper pgtable: 4k pages, 52-bit VAs, pgdp=00000000425f4000
[ffffffffc0000000] pgd=1000000042ac9003, p4d=00000000429e0003, pud=00000000429e1003, pmd=0000000000000000
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 3176 Comm: syz-executor300 Not tainted 6.9.0-rc3-syzkaller-00023-g2c71fdf02a95 #0
Hardware name: linux,dummy-virt (DT)
pstate: 01400009 (nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
pc : pud_alloc include/linux/mm.h:2819 [inline]
pc : huge_pte_alloc+0xd4/0x358 arch/arm64/mm/hugetlbpage.c:280
lr : copy_hugetlb_page_range+0x108/0x924 mm/hugetlb.c:5423
sp : ffff8000890e3810
x29: ffff8000890e3810 x28: ffff80008283c358 x27: fcf0000005e14980
x26: 0000000000000000 x25: fbf0000005e15300 x24: f8f0000006360780
x23: f8f0000006360780 x22: fcf0000005e14980 x21: 0000000021000000
x20: 0000000020400000 x19: ffffffffc0000000 x18: ffff8000890e3ba8
x17: 0000000000000000 x16: 1ede000000c4c181 x15: 0000000000000001
x14: ffffffffffffffff x13: 0000000000000000 x12: ffff8000890e3ac8
x11: 0000000020400000 x10: ffff8000890e3ba8 x9 : 0000000020400000
x8 : 0000000000000000 x7 : 0000000000000102 x6 : 0000000040000000
x5 : 0000000000000000 x4 : ffffffffc0000000 x3 : 0000000000200000
x2 : f3f0000005f34f80 x1 : 0000000000000000 x0 : 0000000040000000
Call trace:
p4d_offset_lockless arch/arm64/include/asm/pgtable.h:965 [inline]
p4d_offset arch/arm64/include/asm/pgtable.h:971 [inline]
huge_pte_alloc+0xd4/0x358 arch/arm64/mm/hugetlbpage.c:279
copy_hugetlb_page_range+0x108/0x924 mm/hugetlb.c:5423
copy_page_range+0x1a0c/0x1a58 mm/memory.c:1355
dup_mmap kernel/fork.c:747 [inline]
dup_mm kernel/fork.c:1687 [inline]
copy_mm+0x62c/0x7ac kernel/fork.c:1736
copy_process+0xc30/0x1484 kernel/fork.c:2389
kernel_clone+0x64/0x360 kernel/fork.c:2796
__do_sys_clone+0x70/0xa8 kernel/fork.c:2939
__se_sys_clone kernel/fork.c:2907 [inline]
__arm64_sys_clone+0x20/0x2c kernel/fork.c:2907
__invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:48
el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:133
do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:152
el0_svc+0x34/0xf8 arch/arm64/kernel/entry-common.c:712
el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730
el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598
Code: aa010084 cb000084 b24c2c84 8b130c93 (f9400260)
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: aa010084 orr x4, x4, x1
4: cb000084 sub x4, x4, x0
8: b24c2c84 orr x4, x4, #0xfff0000000000000
c: 8b130c93 add x19, x4, x19, lsl #3
* 10: f9400260 ldr x0, [x19] <-- trapping instruction


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup