FAT-fs (loop1): Can't find a valid FAT filesystem ================================================================== BUG: KASAN: out-of-bounds in perf_iommu_disable_event arch/x86/events/amd/iommu.c:282 [inline] BUG: KASAN: out-of-bounds in perf_iommu_stop+0x267/0x280 arch/x86/events/amd/iommu.c:339 Read of size 1 at addr ffff8882128f7318 by task syz-executor.1/4376 CPU: 1 PID: 4376 Comm: syz-executor.1 Not tainted 4.14.177-syzkaller #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+0x13e/0x194 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393 perf_iommu_disable_event arch/x86/events/amd/iommu.c:282 [inline] perf_iommu_stop+0x267/0x280 arch/x86/events/amd/iommu.c:339 The buggy address belongs to the page: page:ffffea00084a3dc0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x57ffe0000000000() raw: 057ffe0000000000 0000000000000000 0000000000000000 00000000ffffffff raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8882128f7200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8882128f7280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8882128f7300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8882128f7380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8882128f7400: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 ==================================================================