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=000000004279a000
[ffffffffc0000000] pgd=1000000042c7a003, p4d=0000000042b87003, pud=0000000042b88003, pmd=0000000000000000
Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 UID: 0 PID: 3268 Comm: syz-executor210 Tainted: G    B              6.12.0-rc5-syzkaller-00005-ge42b1a9a2557 #0
Tainted: [B]=BAD_PAGE
Hardware name: linux,dummy-virt (DT)
pstate: 81400009 (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+0x21c/0x828 arch/arm64/mm/trans_pgd.c:217
lr : trans_alloc arch/arm64/mm/trans_pgd.c:31 [inline]
lr : trans_pgd_create_copy+0x34/0x828 arch/arm64/mm/trans_pgd.c:210
sp : ffff8000894dbc30
x29: ffff8000894dbc30 x28: fff0008000000000 x27: ffff80008259a000
x26: fff000007fdff000 x25: fff1000000000000 x24: 0000000000000001
x23: ffff800000000000 x22: fff0000000000000 x21: ffff8000894dbd68
x20: f6f00000070dc000 x19: ffff800000000000 x18: 0000000000000000
x17: ffff80008017b950 x16: ffff80008017b630 x15: 0000000000000001
x14: 0000000000000000 x13: 0000000000000002 x12: 00000000000702df
x11: 0000000000000001 x10: 0000000000000001 x9 : 0000000000000000
x8 : f6f00000070dd000 x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : 0000000000000000 x3 : fff000007fdff000
x2 : ffffffffc0000000 x1 : fff0ffffffffffff x0 : 18000000bfdfe003
Call trace:
 copy_p4d arch/arm64/mm/trans_pgd.c:169 [inline]
 copy_page_tables arch/arm64/mm/trans_pgd.c:190 [inline]
 trans_pgd_create_copy+0x21c/0x828 arch/arm64/mm/trans_pgd.c:217
 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+0x34/0xec 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: f900027c a94573fb 14000179 b40007c0 (f9400040) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	f900027c 	str	x28, [x19]
   4:	a94573fb 	ldp	x27, x28, [sp, #80]
   8:	14000179 	b	0x5ec
   c:	b40007c0 	cbz	x0, 0x104
* 10:	f9400040 	ldr	x0, [x2] <-- trapping instruction