HHVM core debugging

gdb-trace.log

// Hunting down an issue stemming from https://github.com/facebook/hhvm/blob/master/hphp/runtime/base/string-data.cpp#L84

(gdb) bt
#0  raise (sig=11) at ../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00000000049eca29 in HPHP::bt_handler(int, siginfo_t*, void*) (sigin=<optimized out>, info=<optimized out>)
    at hphp/runtime/base/crash-reporter.cpp:270
#2  0x00007faf1f091b80 in <signal handler called> () at /usr/local/fbcode/platform007/lib/libpthread.so.0
#3  0x00000000008ecc55 in HPHP::StringData::MakeShared<true>(folly::Range<char const*>) (sl=...)
    at buck-out/opt-hhvm-lto/gen/hphp/runtime/headers#header-mode-symlink-tree-only,headers,v5c9e8e3/hphp/runtime/base/header-
kind.h:233
#4  HPHP::StringData::MakeStatic(folly::Range<char const*>) (sl=...) at hphp/runtime/base/string-data.cpp:109
#5  0x00000000008ebf86 in HPHP::(anonymous namespace)::insertStaticStringSlice (slice=...)
    at hphp/runtime/base/static-string-table.cpp:186
#6  HPHP::makeStaticString(folly::Range<char const*>) (slice=...) at hphp/runtime/base/static-string-table.cpp:229
#7  HPHP::makeStaticString(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) (str=...)
    at hphp/runtime/base/static-string-table.cpp:261
#8  0x00000000008ebcda in HPHP::PreClass::manglePropName(HPHP::StringData const*, HPHP::StringData const*, HPHP::Attr)
    (className=<optimized out>, propName=0x401daa00, attrs=<optimized out>) at hphp/runtime/vm/preclass.cpp:81
#9  0x0000000004e96f10 in HPHP::PreClassEmitter::Prop::Prop(HPHP::PreClassEmitter const*, HPHP::StringData const*, HPHP::Attr,
 HPHP::StringData const*, HPHP::TypeConstraint const&, HPHP::CompactVector<HPHP::TypeConstraint, std::allocator<char> > const&
, HPHP::StringData const*, HPHP::TypedValue const*, HPHP::RepoAuthType, HPHP::UserAttributeMap)
    (userAttributes=..., repoAuthType=..., val=0x7f9ed759d218, docComment=0xa6d1dc0 <HPHP::s_theEmptyString>, ubs=CompactVecto
r<HPHP::TypeConstraint>: 0 element(s) capacity=0, typeConstraint=..., userType=0xa6d1dc0 <HPHP::s_theEmptyString>, attrs=1064,
 n=0x401daa00, pce=0x7f96de1d2700, this=0x7fad754e0440) at hphp/runtime/vm/preclass-emitter.cpp:98
#10 HPHP::PreClassEmitter::addProperty(HPHP::StringData const*, HPHP::Attr, HPHP::StringData const*, HPHP::TypeConstraint cons
t&, HPHP::CompactVector<HPHP::TypeConstraint, std::allocator<char> > const&, HPHP::StringData const*, HPHP::TypedValue const*,
 HPHP::RepoAuthType, HPHP::UserAttributeMap) [clone .isra.0]
    (this=this@entry=0x7f96de1d2700, n=0x401daa00, attrs=1064, userType=0xa6d1dc0 <HPHP::s_theEmptyString>, typeConstraint=...
, ubs=CompactVector<HPHP::TypeConstraint>: 0 element(s) capacity=0, docComment=0xa6d1dc0 <HPHP::s_theEmptyString>, val=0x7f9ed
759d218, repoAuthType=..., userAttributes=...) at hphp/runtime/vm/preclass-emitter.cpp:186
#11 0x0000000004c3cba6 in HPHP::HHBBC::(anonymous namespace)::emit_class
    (cls=..., offset=<optimized out>, pce=0x7f96de1d2700, ue=..., state=...) at hphp/hhbbc/emit.cpp:1395
#12 HPHP::HHBBC::emit_unit(HPHP::HHBBC::Index const&, HPHP::HHBBC::php::Unit const&) (index=..., unit=...)
    at hphp/hhbbc/emit.cpp:1557
#13 0x0000000004c3d6a6 in operator()(HPHP::HHBBC::php::Unit&) const (__closure=0x7fad73cdd610, unit=...)
    at hphp/hhbbc/whole-program.cpp:565
#14 0x0000000004ca29b1 in HPHP::HHBBC::parallel::for_each<HPHP::HHBBC::(anonymous namespace)::final_pass<HPHP::HHBBC::whole_pr
ogram(HPHP::HHBBC::php::ProgramPtr, HPHP::HHBBC::UnitEmitterQueue&, std::unique_ptr<HPHP::ArrayTypeTable::Builder, std::defaul
t_delete<HPHP::ArrayTypeTable::Builder> >&, int)::{lambda(HPHP::HHBBC::php::Unit&)#2}>(HPHP::HHBBC::Index&, HPHP::HHBBC::php::
Program&, HPHP::HHBBC::StatsHolder const&, HPHP::HHBBC::whole_program(HPHP::HHBBC::php::ProgramPtr, HPHP::HHBBC::UnitEmitterQu
eue&, std::unique_ptr<HPHP::ArrayTypeTable::Builder, std::default_delete<HPHP::ArrayTypeTable::Builder> >&, int)::{lambda(HPHP
::HHBBC::php::Unit&)#2})::{lambda(std::unique_ptr<HPHP::HHBBC::php::Unit, std::default_delete<HPHP::HHBBC::php::Unit> >&)#1},
std::vector<std::default_delete<HPHP::HHBBC::php::Unit>, std::allocator<std::default_delete<HPHP::HHBBC::php::Unit> > >&>(std:
:vector<std::default_delete<HPHP::HHBBC::php::Unit>, std::allocator<std::default_delete<HPHP::HHBBC::php::Unit> > >&, HPHP::HH
BBC::StatsHolder const&)::{lambda()#1}::operator()() const ()
    at buck-out/opt-hhvm-lto/gen/hphp/util/trace#header-mode-symlink-tree-only,headers/hphp/util/trace.h:294
#15 0x00007faf1fba66e0 in std::execute_native_thread_routine(void*) (__p=0x7fadd1db40c0)
    at ../../../.././libstdc++-v3/src/c++11/thread.cc:83
#16 0x00007faf1f0866ce in start_thread (arg=0x7fad754e8700) at pthread_create.c:465
#17 0x00007faf1e76835f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95
(gdb) frame 3
#3  0x00000000008ecc55 in HPHP::StringData::MakeShared<true> (sl=...)
    at buck-out/opt-hhvm-lto/gen/hphp/runtime/headers#header-mode-symlink-tree-only,headers,v5c9e8e3/hphp/runtime/base/header-
kind.h:233
233     in buck-out/opt-hhvm-lto/gen/hphp/runtime/headers#header-mode-symlink-tree-only,headers,v5c9e8e3/hphp/runtime/base/hea
der-kind.h
(gdb) info locals
data = 0x10 <error: Cannot access memory at address 0x10>
count = HPHP::StaticValue
mcret = <optimized out>
ret = <optimized out>
allocSize = 106
sd = 0x0
allocSize = <optimized out>
sd = <optimized out>
data = <optimized out>
count = <optimized out>
mcret = <optimized out>
ret = <optimized out>