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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: dcb6fa37fd7b Linux 6.18-rc3 git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=11a79704580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b8b659f0cab27b22 dashboard link: https://syzkaller.appspot.com/bug?extid=d4ab35af21e99d07ce67 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=115fdf34580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1441d258580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ae6bec0d0398/disk-dcb6fa37.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/dcc732da66c3/vmlinux-dcb6fa37.xz kernel image: https://storage.googleapis.com/syzbot-assets/301d1bbdecc2/Image-dcb6fa37.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d4ab35af21e99d07ce67@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: CPU: 0 PID: 6720 at arch/arm64/kernel/fpsimd.c:370 task_fpsimd_load arch/arm64/kernel/fpsimd.c:370 [inline] WARNING: CPU: 0 PID: 6720 at arch/arm64/kernel/fpsimd.c:370 fpsimd_restore_current_state+0x4cc/0x708 arch/arm64/kernel/fpsimd.c:1746 Modules linked in: CPU: 0 UID: 0 PID: 6720 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : task_fpsimd_load arch/arm64/kernel/fpsimd.c:370 [inline] pc : fpsimd_restore_current_state+0x4cc/0x708 arch/arm64/kernel/fpsimd.c:1746 lr : task_fpsimd_load arch/arm64/kernel/fpsimd.c:370 [inline] lr : fpsimd_restore_current_state+0x4cc/0x708 arch/arm64/kernel/fpsimd.c:1746 sp : ffff8000a1047de0 x29: ffff8000a1047de0 x28: ffff0000dcfd9ec0 x27: 0000000000000000 x26: 0000000000000000 x25: 0000000000000008 x24: 0000000000000040 x23: 00000000000020ff x22: dfff800000000000 x21: 1fffe0001b9fb3d8 x20: 0000000000000000 x19: ffff0000dcfd9ec0 x18: 1fffe000337db690 x17: ffff80008ae011f8 x16: ffff80008052ae04 x15: 0000000000000001 x14: 1fffe0001b9fb3d8 x13: 0000000000000000 x12: 0000000000000000 x11: ffff60001b9fb3d9 x10: 0000000000ff0100 x9 : 0000000000000000 x8 : ffff0000dcfd9ec0 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000008 x3 : ffff8000801f8344 x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: task_fpsimd_load arch/arm64/kernel/fpsimd.c:370 [inline] (P) fpsimd_restore_current_state+0x4cc/0x708 arch/arm64/kernel/fpsimd.c:1746 (P) arch_exit_to_user_mode_work arch/arm64/include/asm/entry-common.h:25 [inline] exit_to_user_mode_loop+0xe4/0x178 kernel/entry/common.c:46 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] arm64_exit_to_user_mode arch/arm64/kernel/entry-common.c:103 [inline] el0_svc+0x170/0x254 arch/arm64/kernel/entry-common.c:747 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:765 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596 irq event stamp: 129 hardirqs last enabled at (127): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (127): [] _raw_spin_unlock_irq+0x30/0x80 kernel/locking/spinlock.c:202 hardirqs last disabled at (129): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:434 softirqs last enabled at (8): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (128): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- --- 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 syzkaller@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