2.6.18-skas-v9-pre9 broken
Blaisorblade,
I recently deployed a 2.6.18-skas3-v9-pre9 host, and some users weren't able to boot UML beyond "VFS: Mounted root (ext3 filesystem) readonly".
As it turns out, only 2.6-um kernels were affected, 2.4-um worked fine.
This happened both in skas3 and skas0 modes. Jeff graciously took a look at some straces, and his comment was that "something broke page fault handling generically".
The traces are here:
http://www.theshore.net/~caker/uml/skas2.6.18-uml_trace.txt (skas3)
http://www.theshore.net/~caker/uml/skas2.6.18-uml_trace_skas0.txt
Reverting back to a skas3-v8.2 kernel fixed it.
HTH,
-Chris
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Quoted 10 lines · Christopher S. Aker
Blaisorblade,
I recently deployed a 2.6.18-skas3-v9-pre9 host, and some users weren't able to boot UML beyond "VFS: Mounted root (ext3 filesystem) readonly".
As it turns out, only 2.6-um kernels were affected, 2.4-um worked fine.This happened both in skas3 and skas0 modes. Jeff graciously took a look at some straces, and his comment was that "something broke page fault handling generically".
Quoted 6 lines
The traces are here:
http://www.theshore.net/~caker/uml/skas2.6.18-uml_trace.txt (skas3)
http://www.theshore.net/~caker/uml/skas2.6.18-uml_trace_skas0.txtReverting back to a skas3-v8.2 kernel fixed it.
An important question: did the patch contain fremap code (the one for 2.6.18-rc4 did)? That code does do heavy changes to page fault handling. I'm also guessing this is a 32bit host.
Signature · 16 lines
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!". Paolo Giarrusso, aka Blaisorblade http://www.user-mode-linux.org/~blaisorblade Chiacchiera con i tuoi amici in tempo reale! http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ User-mode-linux-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
Quoted 11 lines · Blaisorblade
Quoted 10 lines · Christopher S. Aker
Blaisorblade,
I recently deployed a 2.6.18-skas3-v9-pre9 host, and some users weren't able to boot UML beyond "VFS: Mounted root (ext3 filesystem) readonly".
As it turns out, only 2.6-um kernels were affected, 2.4-um worked fine.This happened both in skas3 and skas0 modes. Jeff graciously took a look at some straces, and his comment was that "something broke page fault handling generically".
Quoted 8 lines
Quoted 6 lines
The traces are here:
http://www.theshore.net/~caker/uml/skas2.6.18-uml_trace.txt (skas3)
http://www.theshore.net/~caker/uml/skas2.6.18-uml_trace_skas0.txtReverting back to a skas3-v8.2 kernel fixed it.
An important question: did the patch contain fremap code (the one for 2.6.18-rc4 did)? That code does do heavy changes to page fault handling.
No, it was not the fremap version.
Quoted 1 line
I'm also guessing this is a 32bit host.
Correct.
-Chris
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Quoted 10 lines · Christopher S. Aker
Blaisorblade,
I recently deployed a 2.6.18-skas3-v9-pre9 host, and some users weren't able to boot UML beyond "VFS: Mounted root (ext3 filesystem) readonly".
As it turns out, only 2.6-um kernels were affected, 2.4-um worked fine.This happened both in skas3 and skas0 modes. Jeff graciously took a look at some straces, and his comment was that "something broke page fault handling generically".
Quoted 6 lines
The traces are here:
http://www.theshore.net/~caker/uml/skas2.6.18-uml_trace.txt (skas3)
http://www.theshore.net/~caker/uml/skas2.6.18-uml_trace_skas0.txtReverting back to a skas3-v8.2 kernel fixed it.
An important question: you reverted to a 2.6.18 + skas kernel or a 2.6.17 one? A similar bug is being discussed about a regression in 2.6.18 vanilla...
Signature · 16 lines
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!". Paolo Giarrusso, aka Blaisorblade http://www.user-mode-linux.org/~blaisorblade Chiacchiera con i tuoi amici in tempo reale! http://it.yahoo.com/mail_it/foot/*http://it.messenger.yahoo.com ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ User-mode-linux-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
Quoted 13 lines · Blaisorblade
Quoted 12 lines · Christopher S. Aker
Blaisorblade,
I recently deployed a 2.6.18-skas3-v9-pre9 host, and some users weren't able to boot UML beyond "VFS: Mounted root (ext3 filesystem) readonly".
As it turns out, only 2.6-um kernels were affected, 2.4-um worked fine.This happened both in skas3 and skas0 modes. Jeff graciously took a look at some straces, and his comment was that "something broke page fault handling generically".
The traces are here:
Quoted 7 lines
Quoted 4 lines
http://www.theshore.net/~caker/uml/skas2.6.18-uml_trace.txt (skas3)
http://www.theshore.net/~caker/uml/skas2.6.18-uml_trace_skas0.txtReverting back to a skas3-v8.2 kernel fixed it.
An important question: you reverted to a 2.6.18 + skas kernel or a 2.6.17 one? A similar bug is being discussed about a regression in 2.6.18 vanilla...
Uh, somehow I missed this email for two months...
All my hosts are running at most 2.6.16.x, so this very well could be a regression in post 2.6.16 kernels.
-Chris
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Quoted 7 lines · Christopher S. Aker
Quoted 2 lines · Blaisorblade
An important question: you reverted to a 2.6.18 + skas kernel or a 2.6.17 one? A similar bug is being discussed about a regression in 2.6.18 vanilla...
All my hosts are running at most 2.6.16.x, so this very well could be a regression in post 2.6.16 kernels.
Confirmed. This is a regression in post 2.6.16.x kernels (well, at least 2.6.19). Had a user hit the "VFS: Mounted root (ext3 filesystem) readonly" hang on a 2.6.19 kernel with skas3-v8.2, running 2.6.19-um
Any ideas?
-Chris
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