RN314 smb issues, kernel hang

Running OS6.9.4 hotfix

 

This morning samba file shares where behaving strangely.  Some machines could access some files and not others.  Some couldn't open at all.

 

dmesg showed there was some kind of kernel panic late last night with samba.  After restarting the device, things appear to be working but I'm unclear what happened. This seems similar to https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/RN102-Win7-mounted-drives-are-erratically-available/m-p/1657854

 

[410005.917353] INFO: task smbd:19941 blocked for more than 200 seconds.
[410005.917362]       Tainted: P           O    4.4.140.x86_64.1 #1
[410005.917366] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[410005.917369] smbd            D ffff880025937d30     0 19941  15826 0x00000004
[410005.917378]  ffff880025937d30 ffff880034db2a00 ffff88000ea372d0 ffff880034db2a00
[410005.917384]  ffff88000ea372d4 00000000ffffffff ffff88000ea372d8 ffff880025937d40
[410005.917390]  ffffffff888e2ab0 ffff880025937d50 ffffffff888e2c93 ffff880025937db0
[410005.917396] Call Trace:
[410005.917407]  [<ffffffff888e2ab0>] schedule+0x69/0x7f
[410005.917413]  [<ffffffff888e2c93>] schedule_preempt_disabled+0x9/0xb
[410005.917418]  [<ffffffff888e3b75>] __mutex_lock_slowpath+0x98/0xf1
[410005.917424]  [<ffffffff888e3be0>] mutex_lock+0x12/0x22
[410005.917429]  [<ffffffff888e3be0>] ? mutex_lock+0x12/0x22
[410005.917435]  [<ffffffff882aeb9d>] btrfs_file_write_iter+0x6b/0x3c6
[410005.917441]  [<ffffffff880add97>] ? do_futex+0xdb/0x86e
[410005.917448]  [<ffffffff8811c9bd>] __vfs_write+0x9a/0xc3
[410005.917455]  [<ffffffff8811d0ce>] vfs_write+0xb6/0x160
[410005.917460]  [<ffffffff8811dc09>] SyS_pwrite64+0x5c/0x7b
[410005.917466]  [<ffffffff888e540a>] entry_SYSCALL_64_fastpath+0x1e/0x8e