device lo entered promiscuous mode
WARNING: can't dereference registers at ffff88808821eb28 for ip common_interrupt+0x93/0x93 arch/x86/entry/entry_64.S:576
==================================================================
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x131a/0x1700 arch/x86/kernel/unwind_orc.c:474
Read of size 8 at addr ffff888051caf9e8 by task syz-executor.4/10559

CPU: 0 PID: 10559 Comm: syz-executor.4 Not tainted 4.14.184-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+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1dc 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+0xa9/0x2b9 mm/kasan/report.c:393
 unwind_next_frame+0x131a/0x1700 arch/x86/kernel/unwind_orc.c:474
 perf_callchain_kernel+0x38c/0x520 arch/x86/events/core.c:2343
 get_perf_callchain+0x2df/0x740 kernel/events/callchain.c:217
 perf_callchain+0x147/0x190 kernel/events/callchain.c:190
 perf_prepare_sample+0x75b/0x1350 kernel/events/core.c:6157
 __perf_event_output kernel/events/core.c:6273 [inline]
 perf_event_output_forward+0xc9/0x1f0 kernel/events/core.c:6291
 __perf_event_overflow+0x113/0x310 kernel/events/core.c:7536
 perf_swevent_overflow+0x17b/0x210 kernel/events/core.c:7612
 perf_swevent_event+0x19c/0x270 kernel/events/core.c:7645
 perf_tp_event+0x611/0x7d0 kernel/events/core.c:8074
 perf_trace_run_bpf_submit kernel/events/core.c:8044 [inline]
 perf_trace_run_bpf_submit+0x113/0x170 kernel/events/core.c:8030
 perf_trace_lock_acquire+0x32c/0x4b0 include/trace/events/lock.h:13
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x2b8/0x3f0 kernel/locking/lockdep.c:3997
 rcu_lock_acquire include/linux/rcupdate.h:242 [inline]
 rcu_read_lock include/linux/rcupdate.h:629 [inline]
 ext4_get_group_desc+0x10c/0x440 fs/ext4/balloc.c:294
 recently_deleted fs/ext4/ialloc.c:689 [inline]
 find_inode_bit.isra.0+0x183/0x4e0 fs/ext4/ialloc.c:733
 __ext4_new_inode+0x1379/0x4e80 fs/ext4/ialloc.c:925
 ext4_mkdir+0x2e4/0xb60 fs/ext4/namei.c:2665
 vfs_mkdir+0x3af/0x620 fs/namei.c:3849
 SYSC_mkdirat fs/namei.c:3872 [inline]
 SyS_mkdirat+0x1b5/0x220 fs/namei.c:3856
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x45ca69
RSP: 002b:00007f5bfbd36c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00000000004f63c0 RCX: 000000000045ca69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200001c0
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 000000000000074b R14: 00000000004c2540 R15: 00007f5bfbd376d4

The buggy address belongs to the page:
page:ffffea0001472bc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0xfffe0000000000()
raw: 00fffe0000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888051caf880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888051caf900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888051caf980: 00 00 00 00 f1 f1 f1 f1 f1 f1 04 f2 00 f3 f3 f3
                                                          ^
 ffff888051cafa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888051cafa80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================