SIGSEGV in PDisk WhiteBoardReport

[SammyVimes]

Thread 29265 (LWP 210):	
#0  AtomicGet (a=<error reading variable: Cannot access memory at address 0x18>) at /opt/buildagent/work/8f8495a5a7084bf/library/cpp/deprecated/atomic/atomic_gcc.h:17	
#1  NMonitoring::TDeprecatedCounter::operator long (this=0x18) at /opt/buildagent/work/8f8495a5a7084bf/library/cpp/monlib/counters/counters.h:60	
#2  NKikimr::TLightBase::GetCount (this=<optimized out>) at /opt/buildagent/work/8f8495a5a7084bf/ydb/core/util/light.h:41	
#3  NKikimr::NPDisk::TPDiskActor::TWhiteboardFlag::TSource::GetFlag (this=0x44ee4e2ed6e0) at /opt/buildagent/work/8f8495a5a7084bf/ydb/core/blobstorage/pdisk/blobstorage_pdisk_actor.cpp:127	
#4  NKikimr::NPDisk::TPDiskActor::TWhiteboardFlag::Update (this=this@entry=0x44eeabfe8b60, resendRequired=@0x7fc6b2c54dd0: false) at /opt/buildagent/work/8f8495a5a7084bf/ydb/core/blobstorage/pdisk/blobstorage_pdisk_actor.cpp:184	
#5  0x0000000018d532e4 in NKikimr::NPDisk::TPDiskActor::Handle (this=0x44eeabfe8a00, ev=...) at /opt/buildagent/work/8f8495a5a7084bf/ydb/core/blobstorage/pdisk/blobstorage_pdisk_actor.cpp:1003	
#6  0x000000000e984229 in NActors::TGenericExecutorThread::Execute<NActors::TMailboxTable::TReadAsFilledMailbox> (this=this@entry=0x44ee771c2280, mailbox=0x44ee6eec3880, hint=hint@entry=4172, isTailExecution=<optimized out>) at /opt/buildagent/work/8f8495a5a7084bf/ydb/library/actors/core/executor_thread.cpp:251	
#7  0x000000000e979443 in NActors::TGenericExecutorThread::ProcessExecutorPool(NActors::IExecutorPool*)::$_0::operator()(unsigned int, bool) const (this=this@entry=0x7fc6b2c551a0, activation=activation@entry=4172, isTailExecution=false) at /opt/buildagent/work/8f8495a5a7084bf/ydb/library/actors/core/executor_thread.cpp:441	
#8  0x000000000e978e2a in NActors::TGenericExecutorThread::ProcessExecutorPool (this=this@entry=0x44ee771c2280, pool=<optimized out>) at /opt/buildagent/work/8f8495a5a7084bf/ydb/library/actors/core/executor_thread.cpp:493	
#9  0x000000000e979bc7 in NActors::TExecutorThread::ThreadProc (this=0x44ee771c2280) at /opt/buildagent/work/8f8495a5a7084bf/ydb/library/actors/core/executor_thread.cpp:524	
#10 0x000000000de5159a in (anonymous namespace)::TPosixThread::ThreadProxy (arg=0x44ee7e7a6850) at /opt/buildagent/work/8f8495a5a7084bf/util/system/thread.cpp:244	
#11 0x00007fc718980ac3 in ?? () from /lib/x86_64-linux-gnu/libc.so.6	
#12 0x00007fc718a12850 in ?? () from /lib/x86_64-linux-gnu/libc.so.6