VFS: Busy inodes after unmount of tmpfs. Self-destruct in 5 seconds.  Have a nice day...
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 26958 Comm: syz-executor6 Not tainted 4.9.125+ #37
task: ffff8801d05b8000 task.stack: ffff8801c9788000
RIP: 0010:[<ffffffff81442144>]  [<ffffffff81442144>] shmem_free_inode.isra.1+0x24/0x90 mm/shmem.c:214
RSP: 0018:ffff8801c978fc50  EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff10039183e09
RDX: 000000000000000c RSI: ffffffff8144212f RDI: 0000000000000060
RBP: ffff8801c978fc60 R08: ffff8801d05b88f8 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: ffffffff81448150
R13: ffff8801c8c1f090 R14: ffff8801c8c1f048 R15: ffff8801c8c1f048
FS:  00000000012d8940(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000070cf70 CR3: 00000001d24c5000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffff8801c7eb2200 ffffffff81448150 ffff8801c978fca8 ffffffff814482fd
 ffff8801c978fc88 ffff8801c8c1f0b8 ffff8801c8c1f090 ffffffff81448150
 ffff8801c8c1f168 ffff8801c8c1f0b8 ffffffff8289db20 ffff8801c978fce0
Call Trace:
 [<ffffffff814482fd>] shmem_evict_inode+0x1ad/0x5c0 mm/shmem.c:1067
 [<ffffffff81541e3e>] evict+0x22e/0x4f0 fs/inode.c:553
 [<ffffffff81542f31>] iput_final fs/inode.c:1516 [inline]
 [<ffffffff81542f31>] iput+0x371/0x900 fs/inode.c:1543
 [<ffffffff815bfd31>] fsnotify_detach_mark+0x251/0x2f0 fs/notify/mark.c:170
 [<ffffffff815c10ac>] fsnotify_detach_group_marks+0x5c/0xd0 fs/notify/mark.c:506
 [<ffffffff815beae2>] fsnotify_destroy_group+0x62/0x120 fs/notify/group.c:70
 [<ffffffff815c2827>] inotify_release+0x37/0x50 fs/notify/inotify/inotify_user.c:282
 [<ffffffff814f06f3>] __fput+0x263/0x700 fs/file_table.c:208
 [<ffffffff814f0c15>] ____fput+0x15/0x20 fs/file_table.c:244
 [<ffffffff81138c4c>] task_work_run+0x10c/0x180 kernel/task_work.c:116
 [<ffffffff81003e49>] tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 [<ffffffff81003e49>] exit_to_usermode_loop+0x129/0x150 arch/x86/entry/common.c:161
 [<ffffffff8100570d>] prepare_exit_to_usermode arch/x86/entry/common.c:191 [inline]
 [<ffffffff8100570d>] syscall_return_slowpath arch/x86/entry/common.c:260 [inline]
 [<ffffffff8100570d>] do_syscall_64+0x35d/0x480 arch/x86/entry/common.c:287
 [<ffffffff8278c193>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 1f 84 00 00 00 00 00 55 48 89 e5 41 54 53 48 89 fb e8 21 73 ec ff 48 8d 7b 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 54 48 83 7b 60 00 75 0a e8 fa 72 ec ff 5b 41 5c 
RIP  [<ffffffff81442144>] shmem_free_inode.isra.1+0x24/0x90 mm/shmem.c:214
 RSP <ffff8801c978fc50>
---[ end trace 5c366bd5137db2f6 ]---