FAT-fs (loop1): Invalid FSINFO signature: 0x00fffff8, 0x00000000 (sector = 1)
Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4161 Comm: syz.1.7 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 : fat_generic_ioctl+0x4b8/0xeac fs/fat/file.c:167
lr : sign_extend64 include/linux/bitops.h:183 [inline]
lr : __uaccess_mask_ptr arch/arm64/include/asm/uaccess.h:244 [inline]
lr : fat_ioctl_get_volume_id fs/fat/file.c:122 [inline]
lr : fat_generic_ioctl+0x484/0xeac fs/fat/file.c:167
sp : ffff800020117a80
x29: ffff800020117ba0 x28: ffff0000ce6f1b40 x27: dfff800000000000
x26: dfff800000000000 x25: ffff700004022f54 x24: 00000000fffffdfd
x23: ffff800020117aa0 x22: ffff0000dc6f0000 x21: 0000000000000000
x20: 0000000000000000 x19: ffff0000dc6f0258 x18: 0000000000000000
x17: 0000000000000002 x16: ffff800008e46470 x15: 00000000c0185879
x14: 0000000000ff0100 x13: 1ffff0000282e06b x12: 0000000000080000
x11: 0000000000000e83 x10: 1fffe0001b8de04b x9 : 00000000fffffff2
x8 : 0000000000000000 x7 : ffff800008750ed4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 fat_ioctl_get_volume_id fs/fat/file.c:122 [inline]
 fat_generic_ioctl+0x4b8/0xeac fs/fat/file.c:167
 fat_dir_ioctl+0x184/0x36c fs/fat/dir.c:804
 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: 35004568 2a1f03e9 b9400268 b8000aa8 (93407d20) 
---[ end trace e0d1d76b54c67be4 ]---
----------------
Code disassembly (best guess):
   0:	35004568 	cbnz	w8, 0x8ac
   4:	2a1f03e9 	mov	w9, wzr
   8:	b9400268 	ldr	w8, [x19]
   c:	b8000aa8 	sttr	w8, [x21]
* 10:	93407d20 	sxtw	x0, w9 <-- trapping instruction