Bug 242874

Summary: Kernel BUG at tcp_output:927
Product: Red Hat Enterprise Linux 4 Reporter: aqjh <aqjh>
Component: kernelAssignee: Linda Wang <lwang>
Status: CLOSED WORKSFORME QA Contact: Martin Jenner <mjenner>
Severity: urgent Docs Contact:
Priority: low    
Version: 4.5CC: tgraf
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Hardware: All   
OS: Linux   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2007-11-27 23:41:57 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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log file from netdump none

Description aqjh 2007-06-06 06:54:14 UTC 
Description of problem:
kernel panic, see the attachment

Version-Release number of selected component (if applicable):
kernel-smp-2.6.9-55.EL.x86_64.rpm kernel-smp-2.6.9-55.EL.i686.rpm
kernel-smp-2.6.9-42.EL.x86_64.rpm kernel-smp-2.6.9-42.EL.i686.rpm
kernel-smp-2.6.9-42.0.10.EL.x86_64.rpm kernel-smp-2.6.9-42.0.10.EL.i686.rpm

How reproducible:
install two instances of squid, each listens to the different ip's 80 port, as
the cache server for apache; then kernel panic at uncertain time
  
Actual results:
kernel panic

Additional info:
see the attachment, get from netdump
Comment 1 aqjh 2007-06-06 06:54:14 UTC 
Created attachment 156325 [details]
log file from netdump
Comment 3 Bryan Mason 2007-06-21 22:32:20 UTC 
Other customers who have reported this problem have also reported that setting
/proc/sys/net/ipv4/tcp_retrans_collapse = 0 has resolved this issue for them. 
You can make this a permanent setting by adding the following line to
/etc/sysctl.conf:

    net.ipv4.tcp_retrans_collapse = 0
Comment 4 Linda Wang 2007-06-24 16:42:11 UTC 
please let us know if setting net.ipv4.tcp_retrans_collapse=0 works for you?
If so, please close this bug.   Many thanks.
Comment 5 aqjh 2007-09-17 06:53:03 UTC 
hi, all

when we set net.ipv4.tcp_retrans_collapse = 0, the problem is removed.
thanks all.

Best regards.
Comment 6 Linda Wang 2007-11-27 23:41:57 UTC 
closing this issue based on comment#5.