Hi there, I''m periodically having issues with btrfs running in a Ubuntu VM using VirtualBox. After the VM has been running for a while (a couple days), any write operation seems getting stuck. The read seems totally fine. I tried a simple dd of a 4M file and it got stuck after writing 131K worth of data. I don''t know if this is btrfs related, or it is due to some bug in VritualBox. Could you guys provide information on how to debug this (collecting logs, getting dumps etc.)? Thanks a lot! thanks, - cheng -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Excerpts from Cheng Shao''s message of 2011-04-18 17:49:29 -0400:> Hi there, > > I''m periodically having issues with btrfs running in a Ubuntu VM using > VirtualBox. After the VM has been running for a while (a couple days), > any write operation seems getting stuck. The read seems totally fine. > I tried a simple dd of a 4M file and it got stuck after writing 131K > worth of data. > > I don''t know if this is btrfs related, or it is due to some bug in > VritualBox. Could you guys provide information on how to debug this > (collecting logs, getting dumps etc.)? Thanks a lot!Which kernel are you running? Definitely look for kernel messages (run dmesg etc). If there are no crashes or related messages you can run sysrq-t and send the output and we can look for the deadlock. -chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, 19 Apr 2011 05:08:05 -0700 Chris Mason wrote:> > Excerpts from Cheng Shao''s message of 2011-04-18 17:49:29 -0400: > > Hi there, > > > > I''m periodically having issues with btrfs running in a Ubuntu VM using > > VirtualBox. After the VM has been running for a while (a couple days), > > any write operation seems getting stuck. The read seems totally fine. > > I tried a simple dd of a 4M file and it got stuck after writing 131K > > worth of data. > > > > I don''t know if this is btrfs related, or it is due to some bug in > > VritualBox. Could you guys provide information on how to debug this > > (collecting logs, getting dumps etc.)? Thanks a lot! > > Which kernel are you running? >Not reproducible with Linux 2.6.38.2-9.fc15.x86_64, Fedora 15 beta2, VirtualBox 4.06 on a Mac OS X host. Unrelated to btrfs but related to VirtualBox write hang, I did experience numerous hangs during installation of F15, which were apparently* resolved with kernel parameter clocksource=jiffies which is not related to btrfs, and was not previously required for F14 with earlier versions of VirtualBox. Chris Murphy * I say apparently with a sample of 8 failures without the option and 1 success with the option.-- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html