> i succeeded in getting my device stuck in a frozen state. it seems
alive, i can interact with the shell

How can you interact with the shell? Does it respond to input? Can you
turn the screen on/off with the power button?

> so i grabbed a dump from lsof as well.
> here's the list of open files dump

Good call! unity8 has clearly reached its fd limit. It seems to be
leaking fds (can't tell if it's unity8 itself leaking or another
component inside unity8, e.g., mir):

...
unity8     2421           phablet 1017r      CHR      13,70      0t0    1122358 
/dev/input/event6 (deleted)
unity8     2421           phablet 1018r      CHR      13,70      0t0    1117702 
/dev/input/event6 (deleted)
unity8     2421           phablet 1019r      CHR      13,70      0t0    1120899 
/dev/input/event6 (deleted)
unity8     2421           phablet 1020r     0000        0,9        0       5513 
anon_inode
unity8     2421           phablet 1021r     0000        0,9        0       5513 
anon_inode
unity8     2421           phablet 1022r      CHR      13,70      0t0    1120534 
/dev/input/event6 (deleted)
unity8     2421           phablet 1023r      CHR      13,70      0t0    1117848 
/dev/input/event6 (deleted)

Unfortunately we didn't get a list of files for USC since it's running
as root. If you still have the phone in that state could you rerun lsof
with sudo?

> ok, i was able to attach gdb to usc, here's the bt

The backtrace seems normal. USC is just waiting for work to do, nothing
suspicious in this case.

So, the question is if this is indeed an instance of the same bug we
have been investigating or a different bug you have uncovered.

I will follow the fd leak lead and see if I can get more information.

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https://bugs.launchpad.net/bugs/1491566

Title:
  Shell not responsive after an incoming SMS or call notification

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