syzbot

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=00000000428a7000
[ffffffffc0000000] pgd=1000000042dd7003, p4d=0000000042ce4403, pud=0000000042ce5403, pmd=0000000000000000
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 UID: 0 PID: 3722 Comm: syz.1.115 Not tainted 6.14.0-rc1-syzkaller-00235-g9946eaf552b1 #0
Hardware name: linux,dummy-virt (DT)
pstate: 81402009 (Nzcv daif +PAN -UAO -TCO +DIT -SSBS BTYPE=--)
pc : copy_pud arch/arm64/mm/trans_pgd.c:129 [inline]
pc : copy_p4d arch/arm64/mm/trans_pgd.c:171 [inline]
pc : copy_page_tables arch/arm64/mm/trans_pgd.c:190 [inline]
pc : trans_pgd_create_copy+0x214/0x844 arch/arm64/mm/trans_pgd.c:217
lr : trans_alloc arch/arm64/mm/trans_pgd.c:31 [inline]
lr : trans_pgd_create_copy+0x34/0x844 arch/arm64/mm/trans_pgd.c:210
sp : ffff80008a7e3c20
x29: ffff80008a7e3c20 x28: fff0ffffffffffff x27: ffff80008a7e3d68
x26: ffff80008a7e3d68 x25: ffffffffc0000000 x24: fff000007fdff000
x23: fff1000000000000 x22: ffff800082b33000 x21: fff0000000000000
x20: fff0008000000000 x19: ffff800000000000 x18: 0000000000000000
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000001
x14: 0000000000000000 x13: 0000000000000002 x12: 000000000007046a
x11: 0000000000000000 x10: 1eebec1a6a53c7e1 x9 : 00000000000000f2
x8 : f2f000000cf04000 x7 : 0000000000000000 x6 : 000000004cf03fff
x5 : 000000004cf03000 x4 : ffff7fffffffffff x3 : f2f000000cf03000
x2 : 00000000bfdff000 x1 : fff0ffffffffffff x0 : 18000000bfdfe403
Call trace:
 copy_p4d arch/arm64/mm/trans_pgd.c:169 [inline] (P)
 copy_page_tables arch/arm64/mm/trans_pgd.c:190 [inline] (P)
 trans_pgd_create_copy+0x214/0x844 arch/arm64/mm/trans_pgd.c:217 (P)
 machine_kexec_post_load+0x158/0x2c0 arch/arm64/kernel/machine_kexec.c:135
 do_kexec_load+0x28c/0x2e4 kernel/kexec.c:162
 __do_sys_kexec_load kernel/kexec.c:261 [inline]
 __se_sys_kexec_load kernel/kexec.c:242 [inline]
 __arm64_sys_kexec_load+0x9c/0xe8 kernel/kexec.c:242
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49
 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151
 el0_svc+0x30/0xe0 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x10c/0x138 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x1a4/0x1a8 arch/arm64/kernel/entry.S:600
Code: f900031b a94153f3 14000182 b4000820 (f9400320) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	f900031b 	str	x27, [x24]
   4:	a94153f3 	ldp	x19, x20, [sp, #16]
   8:	14000182 	b	0x610
   c:	b4000820 	cbz	x0, 0x110
* 10:	f9400320 	ldr	x0, [x25] <-- trapping instruction