EXT4-fs (loop4): ext4_check_descriptors: Inode table for group 0 overlaps superblock
EXT4-fs error (device loop4): ext4_iget:4696: inode #2: comm syz-executor.4: root inode unallocated
EXT4-fs (loop4): get root inode failed
EXT4-fs (loop4): mount failed
------------[ cut here ]------------
WARNING: CPU: 1 PID: 7514 at arch/x86/kvm/x86.c:7464 kvm_arch_vcpu_ioctl_run+0xf5/0x1000 arch/x86/kvm/x86.c:7464
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 7514 Comm: exec /dev/kvm Not tainted 4.14.134 #30
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x19c lib/dump_stack.c:53
 panic+0x1f2/0x426 kernel/panic.c:182
 __warn.cold+0x2f/0x36 kernel/panic.c:546
 report_bug+0x216/0x254 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bb/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:960
RIP: 0010:kvm_arch_vcpu_ioctl_run+0xf5/0x1000 arch/x86/kvm/x86.c:7464
RSP: 0018:ffff88805604fbd8 EFLAGS: 00010216
RAX: 0000000000040000 RBX: ffff88808fe21000 RCX: ffffc9000823f000
RDX: 000000000000083d RSI: ffffffff810bf0d5 RDI: ffff8880564b8268
RBP: ffff88805604fc30 R08: 0000000000000001 R09: ffff888082e00920
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880564b8040
R13: 0000000000000000 R14: ffff8880564b8040 R15: ffff8880564b8118
 kvm_vcpu_ioctl+0x401/0xd10 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2588
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x7ae/0x1060 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459829
RSP: 002b:00007f45d57fec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459829
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f45d57ff6d4
R13: 00000000004c2bb7 R14: 00000000004d60f8 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..