syzbot

loop0: detected capacity change from 0 to 2048
EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue. Quota mode: none.
fs-verity: sha512 using implementation "sha512-ce"
Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:
CPU: 0 PID: 4209 Comm: syz.0.17 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 42400405 (nZcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=jc)
pc : fsverity_ioctl_measure+0x1b4/0x564 fs/verity/measure.c:42
lr : fsverity_ioctl_measure+0x190/0x564 fs/verity/measure.c:42
sp : ffff80001fc677e0
x29: ffff80001fc67860 x28: ffff800014448ec0 x27: 1ffff00003f8cf00
x26: dfff800000000000 x25: 0000000000000200 x24: 0000000000000000
x23: 00000000fffffff2 x22: ffff0000ccc69b64 x21: ffff0000ccc69b40
x20: 0000000000000000 x19: ffff0000dd7d9000 x18: 0000000000000000
x17: 0000000000000000 x16: ffff800008a41fdc x15: 00000000c0c0583b
x14: 0000000000ff0100 x13: 1ffff0000282e06b x12: 0000000000ff0100
x11: 0000000000000000 x10: 0000000000000002 x9 : 0000ffffffffffff
x8 : 0000000000000002 x7 : ffff800008750ed4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 fsverity_ioctl_measure+0x1b4/0x564 fs/verity/measure.c:42
 __ext4_ioctl fs/ext4/ioctl.c:1264 [inline]
 ext4_ioctl+0x10d0/0x3614 fs/ext4/ioctl.c:1282
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: d503229f 2a1f03f7 2a1f03e0 78400958 (2a1703e1) 
---[ end trace e711ce646d396779 ]---
----------------
Code disassembly (best guess):
   0:	d503229f 	csdb
   4:	2a1f03f7 	mov	w23, wzr
   8:	2a1f03e0 	mov	w0, wzr
   c:	78400958 	ldtrh	w24, [x10]
* 10:	2a1703e1 	mov	w1, w23 <-- trapping instruction