On 09/22/2016 02:41 AM, Stefan Priebe - Profihost AG wrote:
Hi, i always encounter btrfs deadlocks / hung tasks, when i have a lot of cached mem and i'm doing heavy rsync --inplace operations in my system from btrfs zlib compressed disk A to btrfs zlib compressed disk B. The last output i see in this case is kswapd0 running for a long time at 100% cpu. Then the whole system get's stuck. I cannot connect to ssh anymore but the kernel still prints hung tasks every few minutes. May be relevant the system has NO swap. vm.vfs_cache_pressure = 100 vm.swappiness = 50
Are you able to capture the stack dumps? A sysrq-w would really help. -chris -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
