Bug 286861

Summary: Wrong input confuses bash's arithmetic unit permanently
Product: [Fedora] Fedora Reporter: Enrico Scholz <rh-bugzilla>
Component: bashAssignee: Tomas Janousek <tjanouse>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: 7CC: twaugh
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: 3.2-19.fc7 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2008-01-11 22:04:34 UTC Type: ---
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description Enrico Scholz 2007-09-11 20:17:48 UTC
Description of problem:

$ i=0
$ let ++i
$ echo $i
1

$ let tmp="foo.a"+0
bash: let: tmp=foo.a+0: syntax error: invalid arithmetic...

$ i=0
$ let ++i
$ echo $i
0

--> every further use of 'let' will generate bogus results. bash-3.1 returns
expected results.


Version-Release number of selected component (if applicable):

bash-3.2-9.fc7


How reproducible:

100%

Comment 1 Enrico Scholz 2007-09-12 07:12:47 UTC
upstream report at http://article.gmane.org/gmane.comp.shells.bash.bugs/10506

Comment 2 Pete Graner 2007-09-12 13:12:50 UTC
You can get around it short term by using POSIX syntax:

i=$(( $i + 1 ))

I'm looking to see what changed between 3.1 & 3.2 and go from there.

Comment 3 Enrico Scholz 2007-09-12 13:34:57 UTC
no; same happens with pure POSIX expressions:

$ : $(( tmp=foo.a+0 )) 
bash: tmp=foo.a+0 : syntax error: invalid arithmetic... 
$ i=0 ; : $(( ++i )) ; echo $i 
0 


Patch 20 seems to fix related errors but I did not tested recent version yet.

Comment 4 Tomas Janousek 2007-11-06 12:27:24 UTC
I debugged it and found the cause, let's see what upstream thinks about my
proposed solution:
http://article.gmane.org/gmane.comp.shells.bash.bugs/10729

Comment 5 Tomas Janousek 2007-11-12 17:46:56 UTC
Should be fixed in bash-3.2-19.fc9, I'll release f7 update sooner or later.

Comment 6 Fedora Update System 2007-11-29 01:32:38 UTC
bash-3.2-19.fc7 has been pushed to the Fedora 7 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update bash'

Comment 7 Fedora Update System 2007-11-29 01:37:08 UTC
bash-3.2-19.fc8 has been pushed to the Fedora 8 testing repository.  If problems still persist, please make note of it in this bug report.
 If you want to test the update, you can install it with 
 su -c 'yum --enablerepo=updates-testing update bash'

Comment 8 Fedora Update System 2008-01-11 22:04:21 UTC
bash-3.2-19.fc7 has been pushed to the Fedora 7 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2008-01-11 22:04:57 UTC
bash-3.2-19.fc8 has been pushed to the Fedora 8 stable repository.  If problems still persist, please make note of it in this bug report.