> Hi, > > I don't have an answer, but if you google the phrase "rcu_bh detected > stall on CPU" you can find many reports similar to yours and maybe > some information.
This might be usefu lhttp://www.kernel.org/doc/Documentation/RCU/stallwarn.txt "RCU bugs can often be debugged with the help of CONFIG_RCU_TRACE" from <help> in menuconfig. │ This option provides tracing in RCU which presents stats │ │ in debugfs for debugging RCU implementation. Ok, so I've set the RCU_TRACE=y. Next question: How do I use debugfs, never used it before? > > Do you have RCU_CPU_STALL_INFO=y in your kernel config? no. syzygy@lumby ~ $ grep RCU /usr/src/linux/.config # RCU Subsystem CONFIG_TREE_RCU=y # CONFIG_PREEMPT_RCU is not set # CONFIG_RCU_TRACE is not set CONFIG_RCU_FANOUT=32 # CONFIG_RCU_FANOUT_EXACT is not set # CONFIG_RCU_FAST_NO_HZ is not set # CONFIG_TREE_RCU_TRACE is not set # CONFIG_SPARSE_RCU_POINTER is not set CONFIG_RCU_CPU_STALL_TIMEOUT=60
