kbfs not allowing laptop to suspend

System

• KUbuntu 18.04
• 4.15.0-23-generic kernel
• keybase version 2.1.0-20180615162035+8625b772b1

What happens

With keybase running, if I access kbfs (either through the terminal or file explorer) and go about my day, when I attempt to suspend my laptop, the system locks, then kind of hangs, then wakes back up. Exploring the syslog, I found that something to do with fuse was causing it. See the log below.

I then killed all of keybase doing the following:

$ killall Keybase
$ fusermount -uz /keybase
fusermount: entry for /keybase not found in /etc/mtab
$ killall keybase
$ killall kbfsfuse 

I'm able to suspend my PC now just fine. It's essentially every time I access kbfs that this occurs.

Jun 19 16:50:53 devel systemd[1]: Starting Suspend...
Jun 19 16:50:53 devel wpa_supplicant[1012]: nl80211: deinit ifname=wlp58s0 disabled_11b_rates=0
Jun 19 16:50:53 devel systemd-sleep[31482]: Suspending system...
Jun 19 16:50:53 devel kernel: [28295.483311] PM: suspend entry (deep)
Jun 19 16:50:53 devel kernel: [28295.483313] PM: Syncing filesystems ... done.
Jun 19 16:51:13 devel kernel: [28295.494617] Freezing user space processes ... 
Jun 19 16:51:13 devel kernel: [28315.498453] Freezing of tasks failed after 20.003 seconds (1 tasks refusing to freeze, wq_busy=0):
Jun 19 16:51:13 devel kernel: [28315.498543] ksysguardd      D    0  2223   1869 0x00000004
Jun 19 16:51:13 devel kernel: [28315.498549] Call Trace:
Jun 19 16:51:13 devel kernel: [28315.498566]  __schedule+0x297/0x8b0
Jun 19 16:51:13 devel kernel: [28315.498574]  schedule+0x2c/0x80
Jun 19 16:51:13 devel kernel: [28315.498581]  request_wait_answer+0xa3/0x210
Jun 19 16:51:13 devel kernel: [28315.498587]  ? wait_woken+0x80/0x80
Jun 19 16:51:13 devel kernel: [28315.498592]  __fuse_request_send+0x86/0x90
Jun 19 16:51:13 devel kernel: [28315.498597]  fuse_request_send+0x27/0x30
Jun 19 16:51:13 devel kernel: [28315.498601]  fuse_simple_request+0xcf/0x1a0
Jun 19 16:51:13 devel kernel: [28315.498608]  fuse_statfs+0xe1/0x150
Jun 19 16:51:13 devel kernel: [28315.498617]  statfs_by_dentry+0x6d/0x90
Jun 19 16:51:13 devel kernel: [28315.498622]  vfs_statfs+0x1b/0xc0
Jun 19 16:51:13 devel kernel: [28315.498627]  user_statfs+0x5a/0xa0
Jun 19 16:51:13 devel kernel: [28315.498633]  SYSC_statfs+0x27/0x60
Jun 19 16:51:13 devel kernel: [28315.498640]  SyS_statfs+0xe/0x10
Jun 19 16:51:13 devel kernel: [28315.498647]  do_syscall_64+0x73/0x130
Jun 19 16:51:13 devel kernel: [28315.498652]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
Jun 19 16:51:13 devel kernel: [28315.498658] RIP: 0033:0x7fcc31773977
Jun 19 16:51:13 devel kernel: [28315.498661] RSP: 002b:00007ffcc0d6b628 EFLAGS: 00000246 ORIG_RAX: 0000000000000089
Jun 19 16:51:13 devel kernel: [28315.498666] RAX: ffffffffffffffda RBX: 000055da4fca526a RCX: 00007fcc31773977
Jun 19 16:51:13 devel kernel: [28315.498668] RDX: 000055da4fcf9a80 RSI: 00007ffcc0d6b630 RDI: 000055da4fca526a
Jun 19 16:51:13 devel kernel: [28315.498670] RBP: 00007ffcc0d6b630 R08: 000055da4fcf9810 R09: 0000000000000000
Jun 19 16:51:13 devel kernel: [28315.498673] R10: 000055da4fca2010 R11: 0000000000000246 R12: 000055da4fcf9a10
Jun 19 16:51:13 devel kernel: [28315.498675] R13: 000055da4f423b3a R14: 0000000100002600 R15: 000055da4fcf9810
Jun 19 16:51:13 devel kernel: [28315.498758] OOM killer enabled.

The report identifies kbfsfuse, the /keybase mount, and a FUSE statfs request blocking suspend; start by reproducing suspend after accessing /keybase and inspect the related syslog output. Done means the laptop suspends normally with Keybase running and no FUSE request prevents the system from freezing.