Re: disk-io lockup in 4.14.13 kernel

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On Tue, 2018-03-13 at 16:59 +0200, Jaco Kroon wrote:
> I quickly checked my dmesg logs and I'm not seeing that particular
> message, could be that newer kernels only started warning about it?

Hello Jaco,

That message only appears if  CONFIG_DEBUG_ATOMIC_SLEEP (sleep inside atomic)
is enabled in the kernel config. The kernel configuration options I enable to
test kernel code can be found below. Please note that some of these options
slow down the kernel significantly, so these options should probably not be
enabled on a production system.

CONFIG_BLK_DEBUG_FS
CONFIG_DEBUG_ATOMIC_SLEEP
CONFIG_DEBUG_BOOT_PARAMS
CONFIG_DEBUG_BUGVERBOSE
CONFIG_DEBUG_FS
CONFIG_DEBUG_INFO
CONFIG_DEBUG_INFO_DWARF4
CONFIG_DEBUG_INFO_REDUCED
CONFIG_DEBUG_KERNEL
CONFIG_DEBUG_KMEMLEAK
CONFIG_DEBUG_LIST
CONFIG_DEBUG_LOCK_ALLOC
CONFIG_DEBUG_MUTEXES
CONFIG_DEBUG_OBJECTS
CONFIG_DEBUG_OBJECTS_RCU_HEAD
CONFIG_DEBUG_PAGEALLOC
CONFIG_DEBUG_PER_CPU_MAPS
CONFIG_DEBUG_PI_LIST
CONFIG_DEBUG_PREEMPT
CONFIG_DEBUG_PREEMPT_VOLUNTARY
CONFIG_DEBUG_SG
CONFIG_DEBUG_SPINLOCK
CONFIG_DEBUG_STACKOVERFLOW
CONFIG_DEBUG_STACK_USAGE
CONFIG_DETECT_HUNG_TASK
CONFIG_DYNAMIC_DEBUG
CONFIG_HARDLOCKUP_DETECTOR
CONFIG_KASAN
CONFIG_MAGIC_SYSRQ
CONFIG_PREEMPT
CONFIG_PROVE_LOCKING
CONFIG_PROVE_RCU
CONFIG_SCHED_DEBUG
CONFIG_SLUB
CONFIG_SLUB_DEBUG_ON
CONFIG_WQ_WATCHDOG

Bart.







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