Messages in this thread | | | Date | Tue, 3 Jul 2012 11:49:15 +0800 | From | Fengguang Wu <> | Subject | Re: sync blocked for long time |
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Hi Prasad,
On Mon, Jul 02, 2012 at 08:37:19PM -0700, Prasad Koya wrote: > Hi > > Sorry about writing to your personal address. I'm running into below panic > but I couldn't find any patch for this in 2.6.32. I do see below discussion > related to pretty much similar issue which doesn't appear to be resolved. I > looked around quite a bit but I couldn't find any patches for this. Is this > still unresolved? I have 2 USB sticks and I can get into this state by > copying 2 large files (say 200-300M each) simultaneously (followed by sync) > into both drives.
That is doing sync lots of data on slow device, with the sync time being further enlarged by the active writers. I can imagine for the sync to take very long time.
What's the filesystem btw?
> Appreciate any pointers. > > thank you. > > http://marc.info/?t=126596633700002&r=1&w=2 > > > <3>[ 600.392088] INFO: task sync:2675 blocked for more than 120 seconds. > <3>[ 600.466884] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" > disables this message. ... > <4>[ 600.560507] [<ffffffff810a7dab>] sync_inodes_sb+0x1d/0xf1 > <4>[ 600.560519] [<ffffffff810abb3e>] __sync_filesystem+0x29/0x52 > <4>[ 600.560536] [<ffffffff810abc0f>] sync_filesystems+0xa8/0xfe > <4>[ 600.560556] [<ffffffff810abcb5>] sys_sync+0x1c/0x2e > <4>[ 600.560570] [<ffffffff810260c5>] cstar_dispatch+0x7/0x2b > <0>[ 600.560580] Kernel panic - not syncing: hung_task: blocked tasks
Please check /proc/sys/kernel/hung_task_panic . Normal users should never set it to 1..
Thanks, Fengguang
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