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IDProjectCategoryView StatusDate SubmittedLast Update
0010615Dwarf FortressTechnical -- Generalpublic2018-03-12 01:532018-03-28 14:25
Assigned ToToady One 
PlatformLinuxOSArch LinuxOS Version4.14.4-1-ARCH
Product Version0.44.06 
Target VersionFixed in Version0.44.08 
Summary0010615: Game freezes after some time - new 0.44.06 optimizations?
DescriptionGame just stops taking input commands. Has happened to me 3 times so far, no idea what causes it. Console doesn't output anything. Not using any mods or augments.
Steps To ReproduceReally seems quite random. Have had it happen within minutes of starting or after hours of gameplay.
Additional Informationlinked is a screenshot of the final screen it froze on me last. After alt-tabbing a few times screen went totally black. Tried running game as sudo but problem persists. [^]
I was trying to move up a z layer when it last occured, may be accidentally hitting some game or system keyboard command I don't know about.
Attached Files

- Relationships
has duplicate 0010619resolvedlethosor Game Freeze with 100% cpu usage since update to 44.06 
has duplicate 0010663resolvedLoci Linux Freeze music still plays 

-  Notes
Huntthetroll (reporter)
2018-03-12 15:47

No one else will be able to examine this bug unless you upload an archived copy of the relevant "region" folder to
lethosor (manager)
2018-03-12 18:54
edited on: 2018-03-12 23:24

Also, this doesn't actually relate to artifacts, correct? Titles like that, while amusing, make searching/managing the bug tracker harder.

lethosor (manager)
2018-03-12 23:28

For reference, this was originally reported in [^]

Another user in that thread reported seeing the same issue in an upgraded save, with 100% CPU usage. Does that also happen for you?
tkamat (reporter)
2018-03-13 06:18

I can confirm this issue, running Ubuntu 17.10. Considering everyone reporting this bug seems to run Linux, I suspect it is probably a problem with the Linux version of the game. My behavior is exactly the same as the OP, the game completely freezes seemingly randomly. I am running a brand new save on the vanilla DF.
lethosor (manager)
2018-03-13 07:38
edited on: 2018-03-13 07:39

tkamat, does your CPU usage from DF climb to 100%?

kneaugh (reporter)
2018-03-13 10:10

I am also having the same issue, CPU usage reaches 100%, the game stops responding, and the process has to be killed. Using Linux, vanilla DF, downloaded from the official source, no mods. In my case I don't know that uploading a save would be very instructive–every save I have has the issue eventually. Imported saves from older versions also have the same problem in 44.07 (I haven't tried it in 44.06).

There doesn't seem to be any predictable pattern to it, and sometimes the freeze happens during the initial two weeks of world activity before playing fort or adventure mode.
lethosor (manager)
2018-03-13 10:15

This was also reported in 0010619, with some more information there.

I suspect this is related to one of the optimizations Toady made, similar to 0008568 (for 0.40.17 on Windows).
life-saver (reporter)
2018-03-13 10:32
edited on: 2018-03-13 10:33

Since my issue is closed, I'll continue reporting here.

So, Issue still present in 44.07, same moment. Original init.txt & d_init.txt

I'll try under Windows next.

life-saver (reporter)
2018-03-13 11:18
edited on: 2018-03-13 11:39

Under Windows, it passed through the event.
I saved and brought it back to my Linux station.
But now I have to go back to work, so I'll test under linux tonight.

Consider this as proof that there really is something going on with the Linux version of DF since 44.06

At the rough moment of the event, I have in this save about 9 human adventurers visiting all at once. I'm still under siege.

life-saver (reporter)
2018-03-13 11:44

Logged back from work, DF process is frozen again.

Let me know if you need anything more. I'm glad to help in resolving this issue.
ab9rf (reporter)
2018-03-14 22:44
edited on: 2018-03-14 22:46

I'm fairly certain that this is a =/== mistake. Someone on IRC attached a debugger to a stuck game (64-bit linux, ASLR disabled) and determined that the game is stuck in a tight loop, traversing code from 0x000000000042c13f to 0x000000000042c200. The last three instructions in that range are a move of zero to a memory location, a test of that location against %rbp, and a jump not equal to the start of that range. %rbp is unchanged in that range, so this block of code, if entered with %rbp not equal to zero, will loop forever if none of the other tests lead it to escape.

This is almost certainly the result of writing an equality test (== 0) as an assignment (= 0), either in an if or, more likely, a for or while.

The relevant disassembly can be found at [^]

Toady One (administrator)
2018-03-15 15:48

Hmm, I'd expect Windows freezes if it were that straightforward, but it could be combined in some horrible way with an uninitialized variable or an array bounds issue (the usual culprits on Linux-only bugs). Static analysis came up blank, so looks like I'm in for a longer 44.05/06 diff dive.
Toady One (administrator)
2018-03-18 02:54

Was hoping the diffs would show something before I left, but nothing popped out there either. Left with either output logs on a hopefully quick-freezing save, or figuring out how to analyze a freeze properly in linux internally w/ symbols etc. from my virtual setup, which hasn't been necessary in the past (virtual or otherwise) but might come up now.
Khym Chanur (reporter)
2018-03-21 19:03

You could try running a game under Valgrind, as Valgrind on my computer shows a bunch of "Conditional jump or move depends on uninitialised value(s)" errors, which might be the cause of the problem. That might help you quickly find where the problem is.
Loci (manager)
2018-03-25 19:00

v0.44.07: tristen posted a save in 0010663: [^]
Toady One (administrator)
2018-03-26 20:34

I posted a test fix on the forum at [^] .

The url is [^]

It worked on the freezing save I tested, but the whole thing is sort of dubious, though just the kind of array issue you might expect to optimize differently between operating systems. Or something. Valgrind stopped working before arriving there; not sure if that's a VM issue or what. So I found the problem code by (extensive) logging, though I'm not 100% certain it is fixed.
tkamat (reporter)
2018-03-27 14:14

I played for around a year on my freezing save, and the new patch seems to have fixed the problem. I haven't seen a single freeze or crash yet.
alpha (reporter)
2018-03-27 19:04

Loaded my reliably freezing save - no more freezes. The fix works.

- Issue History
Date Modified Username Field Change
2018-03-12 01:53 fuckbugs New Issue
2018-03-12 15:47 Huntthetroll Note Added: 0037892
2018-03-12 18:54 lethosor Note Added: 0037893
2018-03-12 23:24 lethosor Platform Linux Version 44.06 => Linux
2018-03-12 23:24 lethosor Summary Urist McGame has created a masterful artifact ***Total Game Crash*** => Game freezes after some time
2018-03-12 23:24 lethosor Description Updated View Revisions
2018-03-12 23:24 lethosor Note Edited: 0037893 View Revisions
2018-03-12 23:28 lethosor Note Added: 0037896
2018-03-12 23:28 lethosor Assigned To => lethosor
2018-03-12 23:28 lethosor Status new => needs feedback
2018-03-13 06:18 tkamat Note Added: 0037907
2018-03-13 07:38 lethosor Note Added: 0037909
2018-03-13 07:39 lethosor Note Edited: 0037909 View Revisions
2018-03-13 10:10 kneaugh Note Added: 0037913
2018-03-13 10:14 lethosor Relationship added has duplicate 0010619
2018-03-13 10:15 lethosor Note Added: 0037915
2018-03-13 10:15 lethosor Status needs feedback => acknowledged
2018-03-13 10:15 lethosor Summary Game freezes after some time => Game freezes after some time - new 0.44.06 optimizations?
2018-03-13 10:15 lethosor Tag Attached: 0.44.07
2018-03-13 10:32 life-saver Note Added: 0037919
2018-03-13 10:33 life-saver Note Edited: 0037919 View Revisions
2018-03-13 11:18 life-saver Note Added: 0037922
2018-03-13 11:18 life-saver Note Edited: 0037922 View Revisions
2018-03-13 11:21 life-saver Note Edited: 0037922 View Revisions
2018-03-13 11:39 life-saver Note Edited: 0037922 View Revisions
2018-03-13 11:44 life-saver Note Added: 0037923
2018-03-14 22:44 ab9rf Note Added: 0037933
2018-03-14 22:45 ab9rf Note Edited: 0037933 View Revisions
2018-03-14 22:46 ab9rf Note Edited: 0037933 View Revisions
2018-03-15 08:19 lethosor Issue Monitored: Toady One
2018-03-15 08:19 lethosor Severity crash => block
2018-03-15 15:48 Toady One Note Added: 0037941
2018-03-18 02:54 Toady One Note Added: 0037967
2018-03-21 19:03 Khym Chanur Note Added: 0037990
2018-03-21 19:03 Khym Chanur Issue Monitored: Khym Chanur
2018-03-22 10:29 Huntthetroll Issue Monitored: Huntthetroll
2018-03-23 02:18 alpha Issue Monitored: alpha
2018-03-25 18:58 Loci Relationship added has duplicate 0010663
2018-03-25 19:00 Loci Note Added: 0038029
2018-03-26 20:34 Toady One Note Added: 0038039
2018-03-26 20:34 Toady One Status acknowledged => needs feedback
2018-03-27 14:14 tkamat Note Added: 0038047
2018-03-27 19:04 alpha Note Added: 0038048
2018-03-28 14:25 Toady One Status needs feedback => resolved
2018-03-28 14:25 Toady One Fixed in Version => Next Version
2018-03-28 14:25 Toady One Resolution open => fixed
2018-03-28 14:25 Toady One Assigned To lethosor => Toady One
2018-04-02 20:12 Huntthetroll Issue End Monitor: Huntthetroll

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