Hi Chris, today i had this again. But i can't see any stack traces. I just see.
INFO: kworker/u128:5:24301 blocked for more than 120 seconds. ... INFO: kworker/u128:5:24301 blocked for more than 120 seconds. ... INFO: task mysqld:929 blocked for more ... ... sysrq w just prints: sysrq: SysRq: Show Blcoked State but nothing more. Stefan Am 22.09.2016 um 16:28 schrieb Chris Mason: > > > 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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
