EXT4-fs (loop4): Remounting filesystem read-only
EXT4-fs error (device loop4): ext4_quota_enable:5739: comm syz-executor.4: Bad quota inode # 3
WARNING: can't dereference registers at 1ffff110174a0f90 for ip apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793
EXT4-fs warning (device loop4): ext4_enable_quotas:5779: Failed to enable quota tracking (type=-1, err=-117). Please run e2fsck to fix.
EXT4-fs (loop4): Cannot turn on quotas: error -117
EXT4-fs (loop4): mounted filesystem without journal. Opts: errors=remount-ro,
==================================================================
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
Read of size 8 at addr ffff888056567380 by task syz-executor.4/9596

CPU: 0 PID: 9596 Comm: syz-executor.4 Not tainted 4.14.285-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+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
 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
 __perf_event_output kernel/events/core.c:6282 [inline]
 perf_event_output_forward+0xc9/0x1f0 kernel/events/core.c:6300
 __perf_event_overflow+0x113/0x310 kernel/events/core.c:7549
 perf_swevent_overflow kernel/events/core.c:7625 [inline]
 perf_swevent_event+0x299/0x460 kernel/events/core.c:7653
 perf_tp_event+0x540/0x6e0 kernel/events/core.c:8087
 perf_trace_run_bpf_submit+0x119/0x200 kernel/events/core.c:8057
 perf_trace_lock+0x2d6/0x490 include/trace/events/lock.h:39
 trace_lock_release include/trace/events/lock.h:58 [inline]
 lock_release+0x4df/0x870 kernel/locking/lockdep.c:4016
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:158 [inline]
 _raw_spin_unlock_irqrestore+0x1b/0xe0 kernel/locking/spinlock.c:192
 rcu_read_unlock_special+0x776/0xdd0 kernel/rcu/tree_plugin.h:528
 __rcu_read_unlock+0x158/0x160 kernel/rcu/update.c:260
 rcu_read_unlock include/linux/rcupdate.h:684 [inline]
 ext4_get_group_info fs/ext4/ext4.h:2852 [inline]
 ext4_mb_find_by_goal+0x25d/0x10a0 fs/ext4/mballoc.c:1841
 ext4_mb_regular_allocator+0x1e6/0xe70 fs/ext4/mballoc.c:2133
 ext4_mb_new_blocks+0x1969/0x3db0 fs/ext4/mballoc.c:4604
 ext4_ext_map_blocks+0x2845/0x6b10 fs/ext4/extents.c:4505
 ext4_map_blocks+0x675/0x1730 fs/ext4/inode.c:656
 ext4_alloc_file_blocks.isra.0+0x24e/0x840 fs/ext4/extents.c:4732
 ext4_fallocate+0x713/0x1d80 fs/ext4/extents.c:5014
 vfs_fallocate+0x346/0x790 fs/open.c:319
 ioctl_preallocate+0x132/0x1a0 fs/ioctl.c:481
 file_ioctl fs/ioctl.c:497 [inline]
 do_vfs_ioctl+0xd94/0xff0 fs/ioctl.c:684
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x7f533aebd109
RSP: 002b:00007f5339832168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f533afcff60 RCX: 00007f533aebd109
RDX: 0000000020000040 RSI: 000000004030582a RDI: 0000000000000003
RBP: 00007f533af1705d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd4ab8915f R14: 00007f5339832300 R15: 0000000000022000

The buggy address belongs to the page:
page:ffffea00015959c0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0xfff00000000000()
raw: 00fff00000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 ffffea00015959e0 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888056567280: 00 00 00 00 f1 f1 f1 f1 f1 f1 04 f2 00 f3 f3 f3
 ffff888056567300: 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1 04 f3
>ffff888056567380: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                   ^
 ffff888056567400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888056567480: 00 00 00 00 f1 f1 f1 f1 00 00 f3 f3 00 00 00 00
==================================================================