FAT-fs (loop5): bogus number of reserved sectors ------------[ cut here ]------------ WARNING: CPU: 0 PID: 16985 at arch/x86/kernel/cpu/mtrr/generic.c:216 mtrr_type_lookup_variable+0x4ca/0x670 arch/x86/kernel/cpu/mtrr/generic.c:216 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 16985 Comm: syz-executor.3 Not tainted 4.14.138 #34 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:963 RIP: 0010:mtrr_type_lookup_variable+0x4ca/0x670 arch/x86/kernel/cpu/mtrr/generic.c:216 RSP: 0018:ffff8880520df7b0 EFLAGS: 00010212 RAX: 0000000000040000 RBX: 00000000c0000000 RCX: ffffc90009669000 RDX: 000000000000124b RSI: ffffffff8125379a RDI: ffffffff885be4ac RBP: ffff8880520df880 R08: ffff8880520df8f8 R09: 0000000000000001 R10: 0000000000000000 R11: ffff8880511961c0 R12: 00003fffc0000000 R13: 0000000000000000 R14: 0000000040000000 R15: dffffc0000000000 kobject: 'loop4' (ffff8880a4b513a0): kobject_uevent_env mtrr_type_lookup+0x10e/0x370 arch/x86/kernel/cpu/mtrr/generic.c:285 pat_x_mtrr_type arch/x86/mm/pat.c:395 [inline] reserve_memtype arch/x86/mm/pat.c:558 [inline] reserve_memtype+0x2f4/0x640 arch/x86/mm/pat.c:528 reserve_pfn_range+0x11c/0x390 arch/x86/mm/pat.c:868 track_pfn_remap+0x15a/0x240 arch/x86/mm/pat.c:960 remap_pfn_range+0x1bc/0xaa0 mm/memory.c:2108 mmap_mem+0x1e1/0x281 drivers/char/mem.c:387 kobject: 'loop4' (ffff8880a4b513a0): fill_kobj_path: path = '/devices/virtual/block/loop4' call_mmap include/linux/fs.h:1782 [inline] mmap_region+0x852/0x1030 mm/mmap.c:1723 do_mmap+0x5b8/0xcd0 mm/mmap.c:1501 do_mmap_pgoff include/linux/mm.h:2178 [inline] vm_mmap_pgoff+0x17a/0x1d0 mm/util.c:333 SYSC_mmap_pgoff mm/mmap.c:1551 [inline] SyS_mmap_pgoff+0x3ca/0x520 mm/mmap.c:1509 SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x459829 RSP: 002b:00007fb95f204c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000459829 RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000000020ffc000 RBP: 000000000075bf20 R08: 0000000000000003 R09: 01000000bffff000 R10: 0000000000000012 R11: 0000000000000246 R12: 00007fb95f2056d4 R13: 00000000004c5d1b R14: 00000000004da750 R15: 00000000ffffffff Kernel Offset: disabled Rebooting in 86400 seconds..