Opened 6 years ago

Closed 6 years ago

Last modified 6 years ago

#10948 closed Bug Report - General (fixed)

EITScanner::StopActiveScan() && TVRec::SetChannel() deadlock

Reported by: stuartm Owned by: danielk
Priority: blocker Milestone: 0.26
Component: MythTV - Recording Version: Master Head
Severity: medium Keywords:
Cc: Ticket locked: no

Description

Backtrace attached

Attachments (1)

gdb.txt​ (123.4 KB) - added by stuartm 6 years ago.
Backtrace

Download all attachments as: .zip

Change History (5)

Changed 6 years ago by stuartm

Attachment: gdb.txt​ added

Backtrace

comment:1 Changed 6 years ago by Daniel Thor Kristjansson <danielk@…>

Resolution: → fixed
Status: new → closed

In e8073bc0e9cbd3aaaaff85d6ca4ef12c79bf71d2/mythtv:

Fixes #10948. Fixes EIT shutdown deadlock.

comment:2 Changed 6 years ago by danielk

Summary: backend deadlock in TVRec::RecordPending() → EITScanner::StopActiveScan() && TVRec::SetChannel() deadlock

comment:3 Changed 6 years ago by Daniel Thor Kristjansson <danielk@…>

In 0e5d159c6bc98ef29a7b6bb225b43492b45c37ac/mythtv:

Refs #10948. Fully randomize EIT crawl start time.

The deadlocks we've been seeing here should be fixed now, but they
should have been rare to begin with due to randomization of the
EIT Scanning start time. But they were occurring at fairly high
frequency. It turns out we were not applying enough randomness when
there were multiple cards and we were also losing randomness after
the first recording on a tuner finished and we reset the clock.

comment:4 Changed 6 years ago by Daniel Thor Kristjansson <danielk@…>

In 957c7e20c8b9e2f2bb50a5fc826810c39689db4b/mythtv:

Refs #10948. Fully randomize EIT crawl start time.

The deadlocks we've been seeing here should be fixed now, but they
should have been rare to begin with due to randomization of the
EIT Scanning start time. But they were occurring at fairly high
frequency. It turns out we were not applying enough randomness when
there were multiple cards and we were also losing randomness after
the first recording on a tuner finished and we reset the clock.
(cherry picked from commit 0e5d159c6bc98ef29a7b6bb225b43492b45c37ac)

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