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ID Category Severity Reproducibility Date Submitted Last Update
0006588 [Squeak] Kernel block random 08-02-07 11:36 12-01-08 23:03
Reporter al View Status public  
Assigned To
Priority high Resolution fixed  
Status closed   Product Version 3.10
Summary 0006588: Broken Semaphore>>critical: leads to frozen processes in Delay
Description David Shaffer: VNC doesn't respond to UI events, 0% cpu usage, several processes frozen in Delay although our Seaside server still responds.

Andreas Raab: You're missing another batch of fixes that we have long applied to our servers. In this case it's the handling of Semaphore>>critical: (which is broken in all Squeak versions).
Additional Information See mail http://lists.squeakfoundation.org/pipermail/squeak-dev/2007-July/119082.html [^] and answers to it.
Attached Files  SemaTests-ar.cs [^] (1,413 bytes) 10-06-07 01:22
 SemaCritical-ar.cs [^] (4,050 bytes) 10-06-07 01:35

- Relationships

SYSTEM WARNING: Creating default object from empty value

SYSTEM WARNING: Creating default object from empty value

SYSTEM WARNING: Creating default object from empty value

has duplicate 0006587closed  Broken Semaphore>>critical: leads to frozen processes in Delay 
has duplicate 0006582closed  Semaphore fix 
related to 0004882closed  VM lockup 
related to 0006576closed  Delay is not thread-safe 

- Notes
(0011237 - 196 - 208 - 208 - 208 - 208 - 208)
GazzaGuru
10-05-07 22:16

Though the fixes help somewhat there is still a problem with termination of processes leading to over/under signaling of semaphores.

In particular Seaside will terminate a process on timeout...
 
(0011239 - 422 - 460 - 460 - 460 - 460 - 460)
andreas
10-06-07 01:26

I think the attached two change sets should do it. The first one (SemaTests-ar) provides tests for the "one too many" and "one too few" behavior as I understand it so far. The second one (SemaCritical-ar) tries to address the issues by cooperating between Process>>terminate and Semaphore>>critical:. Note that it is critically important (pun intended) to use Semaphore>>critical: from all of the other critical: variants.
 
(0011241 - 141 - 195 - 195 - 195 - 195 - 195)
Keith_Hodges
10-06-07 10:48

"fix begin"
Installer mantis bug: 6588 fix: 'SemaCritical-ar.cs'.
"fix test"
Installer mantis bug: 6588 fix: 'SemaTests-ar.cs'.
"fix end"
 
(0011437 - 67 - 79 - 79 - 79 - 79 - 79)
edgardec
11-15-07 18:04

This is 7153SemaCritical-ar.cs in the 3.10.1 updates.

Thanks all
 
(0012820 - 55 - 55 - 55 - 55 - 55 - 55)
KenCausey
12-01-08 23:03

Harvested as update 7153 and released with Squeak 3.10.
 

- Issue History
Date Modified Username Field Change
08-02-07 11:36 al New Issue
08-02-07 11:36 al File Added: SemaphoreCritical-ar.1.cs
08-02-07 11:56 al Issue Monitored: al
08-03-07 00:29 wiz Relationship added related to 0004882
10-05-07 22:13 matthewf Relationship added related to 0006576
10-05-07 22:16 GazzaGuru Note Added: 0011237
10-06-07 01:22 andreas File Added: SemaTests-ar.cs
10-06-07 01:23 andreas File Added: SemaCritical-ar.cs
10-06-07 01:24 andreas File Deleted: SemaphoreCritical-ar.1.cs
10-06-07 01:26 andreas Note Added: 0011239
10-06-07 01:35 andreas File Deleted: SemaCritical-ar.cs
10-06-07 01:35 andreas File Added: SemaCritical-ar.cs
10-06-07 10:48 Keith_Hodges Note Added: 0011241
10-09-07 01:40 matthewf Relationship added has duplicate 0006587
10-09-07 01:43 matthewf Relationship added has duplicate 0006582
10-09-07 20:37 edgardec Status new => resolved
10-09-07 20:37 edgardec version  => 3.10
11-15-07 18:04 edgardec Note Added: 0011437
12-18-07 15:32 lewis Issue Monitored: lewis
12-01-08 23:03 KenCausey Status resolved => closed
12-01-08 23:03 KenCausey Note Added: 0012820
12-01-08 23:03 KenCausey Resolution open => fixed
12-01-08 23:03 KenCausey Fixed in Version  => 3.10


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