FAT-fs (loop0): Can't find a valid FAT filesystem
FAT-fs (loop1): Can't find a valid FAT filesystem
FAT-fs (loop3): bogus number of reserved sectors
FAT-fs (loop3): Can't find a valid FAT filesystem
==================================================================
BUG: KASAN: stack-out-of-bounds in deref_stack_regs arch/x86/kernel/unwind_orc.c:304 [inline]
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x146f/0x17d0 arch/x86/kernel/unwind_orc.c:437
FAT-fs (loop5): bogus number of reserved sectors
Read of size 8 at addr ffff88808daef7f0 by task syz-executor.1/14423

CPU: 1 PID: 14423 Comm: syz-executor.1 Not tainted 4.14.290-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
FAT-fs (loop5): Can't find a valid FAT filesystem
 deref_stack_regs arch/x86/kernel/unwind_orc.c:304 [inline]
 unwind_next_frame+0x146f/0x17d0 arch/x86/kernel/unwind_orc.c:437
 perf_callchain_kernel+0x38c/0x520 arch/x86/events/core.c:2344
 get_perf_callchain+0x2de/0x740 kernel/events/callchain.c:217
 perf_callchain+0x147/0x190 kernel/events/callchain.c:190
 perf_prepare_sample+0xc9a/0x1370 kernel/events/core.c:6166
FAT-fs (loop2): bogus number of reserved sectors
 __perf_event_output kernel/events/core.c:6282 [inline]
 perf_event_output_forward+0xc9/0x1f0 kernel/events/core.c:6300
FAT-fs (loop2): Can't find a valid FAT filesystem
 __perf_event_overflow+0x113/0x310 kernel/events/core.c:7549
 perf_swevent_hrtimer+0x220/0x350 kernel/events/core.c:8757
 __run_hrtimer kernel/time/hrtimer.c:1223 [inline]
 __hrtimer_run_queues+0x30b/0xc80 kernel/time/hrtimer.c:1287
 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline]
 smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1104
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
 </IRQ>
FAT-fs (loop4): bogus number of reserved sectors
RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:774 [inline]
RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:796 [inline]
RIP: 0010:lock_acquire+0x97/0x3f0 kernel/locking/lockdep.c:3993
RSP: 0018:ffff88808daef688 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff11e1340 RBX: ffff888093d3a680 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff888093d3af04
RBP: ffffffff893bca40 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffff888093d3a680 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
 kobj_lookup+0x25a/0x400 drivers/base/map.c:102
 retint_kernel+0x2d/0x2d
RIP: 0000:0xffff888093d3aed4
RSP: b1f54740:dffffc0000000000 EFLAGS: 1ffff11011b5df0a ORIG_RAX: ffffffff87cd0400
RAX: ffff88823fff704f RBX: 0000000000000000 RCX: ffff88823fff7058
RDX: ffff88808daef808 RSI: 1ffffffff1198fad RDI: 0000000000000000
FAT-fs (loop4): Can't find a valid FAT filesystem
RBP: ffffffff81417ae8 R08: ffff88823fff7057 R09: 000000b70eb5f9cb
R10: ffffffff81001bbe R11: ffff88808daef7f8 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FAT-fs (loop0): bogus number of reserved sectors
FAT-fs (loop0): Can't find a valid FAT filesystem
FAT-fs (loop3): bogus number of reserved sectors
FAT-fs (loop3): Can't find a valid FAT filesystem

The buggy address belongs to the page:
page:ffffea000236bbc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0xfff00000000000()
raw: 00fff00000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88808daef680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808daef700: 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00
>ffff88808daef780: f2 00 00 00 f2 f2 f2 00 00 00 00 00 f3 f3 f3 f3
                                                             ^
 ffff88808daef800: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88808daef880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================