Bug #3627: TVHeadend locks up and spins a CPU after the Spring DST change - Tvheadend

Bug #3627

TVHeadend locks up and spins a CPU after the Spring DST change

Added by Michael Marley over 8 years ago. Updated about 8 years ago.

Status:

Fixed

Priority:

Normal

Assignee:

Category:

Crashes

Target version:

Start date:

2016-03-13

Due date:

% Done:

100%

Estimated time:

Found in version:

4.1-1670~g5a94400~wily

Affected Versions:

Description

Last night when the time changed for Daylight Savings Time, both of the TVHeadend instances I operate became unresponsive and starting spinning one CPU core at 100%. After restarting, they resumed normal operation. I have attached full GDB backtraces from both of them.

Files

gdb.txt (39.7 KB) gdb.txt		Michael Marley, 2016-03-13 12:40
gdb2.txt (72.7 KB) gdb2.txt		Michael Marley, 2016-03-13 12:40

History

Updated by Jaroslav Kysela over 8 years ago

Unfortunately, it really difficult to track what's wrong there - I need to know where it loops, some analysis:

now=1457849040, zone=EDT

TZ=/usr/share/zoneinfo/US/Eastern  ./a.out "4 14 * * *" 1457849040
TIME = 1457849040 - 2016-03-13 01:04 (DST 0) (ZONE EST)
min  = 000010000000000000000000000000000000000000000000000000000000
hour = 000000000000001000000000
mday = 1111111111111111111111111111111
mon  = 111111111111
wday = 1111111
NOW: 2016-03-13 01:04
NXT: 1457892240 - 2016-03-13 14:04 (DST 1) (ZONE EDT)

but...

#6  0x0000000000482749 in cron_multi_next (cm=0x2148990, now=1457849040, ret=ret@entry=0x7ffe9be92dc0) at src/cron.c:341
        i = 1
        r = 1457849040
        t = 1457849040

... if r is equal to now and it's passed back to the caller - where's the source ?

ok.. ota epg has also second time...

TZ=/usr/share/zoneinfo/US/Eastern  ./a.out "4 2 * * *" 1457849040
TIME = 1457849040 - 2016-03-13 01:04 (DST 0) (ZONE EST)
min  = 000010000000000000000000000000000000000000000000000000000000
hour = 001000000000000000000000
mday = 1111111111111111111111111111111
mon  = 111111111111
wday = 1111111
NOW: 2016-03-13 01:04
NXT: 1457849040 - 2016-03-13 01:04 (DST 0) (ZONE EST)

and we're there..