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WARNING: CPU: 1 PID: 11434 at arch/x86/mm/pat.c:1020 untrack_pfn+0x1dc/0x220 arch/x86/mm/pat.c:1020
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 11434 Comm: syz-executor.0 Not tainted 4.14.146 #0
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+0x138/0x197 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:963
RIP: 0010:untrack_pfn+0x1dc/0x220 arch/x86/mm/pat.c:1020
RSP: 0018:ffff88805b64f948 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff8880a0900738 RCX: ffffc9000704e000
kobject: 'loop2' (ffff8880a49e51e0): kobject_uevent_env
RDX: 0000000000040000 RSI: ffffffff812a668c RDI: 0000000000000001
RBP: ffff88805b64f9d8 R08: ffff888099c1c440 R09: 0000000000000000
R10: 0000000000000000 R11: ffff888099c1c440 R12: 1ffff1100b6c9f2a
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88805b64f9b0
kobject: 'loop2' (ffff8880a49e51e0): fill_kobj_path: path = '/devices/virtual/block/loop2'
 unmap_single_vma+0x182/0x2c0 mm/memory.c:1539
 unmap_vmas+0xac/0x170 mm/memory.c:1590
 exit_mmap+0x285/0x4e0 mm/mmap.c:3062
 __mmput kernel/fork.c:935 [inline]
 mmput+0x114/0x440 kernel/fork.c:956
 dup_mm kernel/fork.c:1224 [inline]
 copy_mm kernel/fork.c:1263 [inline]
 copy_process.part.0+0x4743/0x6a00 kernel/fork.c:1780
kobject: 'loop5' (ffff8880a4a7caa0): kobject_uevent_env
 copy_process kernel/fork.c:1595 [inline]
 _do_fork+0x19e/0xce0 kernel/fork.c:2085
 SYSC_clone kernel/fork.c:2195 [inline]
 SyS_clone+0x37/0x50 kernel/fork.c:2189
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
kobject: 'loop5' (ffff8880a4a7caa0): fill_kobj_path: path = '/devices/virtual/block/loop5'
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459a29
RSP: 002b:00007f59ecfdcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f59ecfdcc90 RCX: 0000000000459a29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f59ecfdd6d4
R13: 00000000004bfeeb R14: 00000000004d1db0 R15: 0000000000000007
Kernel Offset: disabled
Rebooting in 86400 seconds..