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SubjectBoot failures with net-next after rebase to v4.17.0-rc1
Hi all,

I'm experiencing boot failures with net-next git-tree after it got
rebased/merged with Linus'es tree at v4.17.0-rc1.

The boot problem only occurs for certain kernel configs. I've bisected
the config problem down to enabling CONFIG_PREEMPT=y and resulting
dependencies in below diff.

Is this a know problem?
Have others experienced this too?

This happens for me on two different (x86_64) testlab machines...
I also tested on Linus'es tree at v4.17-rc2, and problem also exists
for me there.
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer


--- config21-steps-works 2018-04-24 21:33:42.353751894 +0200
+++ config20-steps-bad 2018-04-24 21:27:19.852654328 +0200
@@ -131,7 +131,7 @@
#
# RCU Subsystem
#
-CONFIG_TREE_RCU=y
+CONFIG_PREEMPT_RCU=y
# CONFIG_RCU_EXPERT is not set
CONFIG_SRCU=y
CONFIG_TREE_SRCU=y
@@ -421,11 +421,7 @@
CONFIG_BFQ_GROUP_IOSCHED=y
CONFIG_PREEMPT_NOTIFIERS=y
CONFIG_ASN1=y
-CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
-CONFIG_INLINE_READ_UNLOCK=y
-CONFIG_INLINE_READ_UNLOCK_IRQ=y
-CONFIG_INLINE_WRITE_UNLOCK=y
-CONFIG_INLINE_WRITE_UNLOCK_IRQ=y
+CONFIG_UNINLINE_SPIN_UNLOCK=y
CONFIG_ARCH_SUPPORTS_ATOMIC_RMW=y
CONFIG_MUTEX_SPIN_ON_OWNER=y
CONFIG_RWSEM_SPIN_ON_OWNER=y
@@ -497,9 +493,10 @@
CONFIG_SCHED_SMT=y
CONFIG_SCHED_MC=y
CONFIG_SCHED_MC_PRIO=y
-CONFIG_PREEMPT_NONE=y
+# CONFIG_PREEMPT_NONE is not set
# CONFIG_PREEMPT_VOLUNTARY is not set
-# CONFIG_PREEMPT is not set
+CONFIG_PREEMPT=y
+CONFIG_PREEMPT_COUNT=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS=y
@@ -3931,6 +3928,7 @@
# CONFIG_SCHEDSTATS is not set
# CONFIG_SCHED_STACK_END_CHECK is not set
# CONFIG_DEBUG_TIMEKEEPING is not set
+# CONFIG_DEBUG_PREEMPT is not set

#
# Lock Debugging (spinlocks, mutexes, etc...)
@@ -3996,6 +3994,7 @@
CONFIG_FUNCTION_GRAPH_TRACER=y
# CONFIG_PREEMPTIRQ_EVENTS is not set
# CONFIG_IRQSOFF_TRACER is not set
+# CONFIG_PREEMPT_TRACER is not set
# CONFIG_SCHED_TRACER is not set
CONFIG_HWLAT_TRACER=y
# CONFIG_FTRACE_SYSCALLS is not set
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