https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105880
Bug ID: 105880
Summary: eh_globals_init destructor not setting _M_init to
false
Product: gcc
Version: 12.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: chrisj at rtems dot org
Target Milestone: ---
RTEMS 6 with GCC 12 (gcc version 12.1.1 20220509 (RTEMS 6, RSB
e73a258a3aa4af8735b589a2d770571b2105ac5f, Newlib 64b2081) (GCC)) is calling
`std::terminate()` in `__cxa_get_globals()`. The `_M_init` value is `true`
after the static destructor has run.
RTEMS is tracking the issue with https://devel.rtems.org/ticket/4661.
When `exit()` is called the static destructor for `eh_gloabls init` runs and
deletes the POSIX key however the `_M_init` variable is not set to false.
Later `__cxxabiv1::__cxa_get_globals()` is called and sees `_M_init` is `true`
so attempts to get the POSIX key value. This fails because the key has been
deleted so `NULL` is returned. Memory is allocated and the set fails because
there is no key so `std::terminate()` is called.
The issue is `init._M_init` is not set to false in the static destructor. The
code for aarch64 and arm is:
006562e0 <__eh_globals_init::~__eh_globals_init()>:
6562e0: 7903 ldrb r3, [r0, #4]
6562e2: b510 push {r4, lr}
6562e4: 4604 mov r4, r0
6562e6: b90b cbnz r3, 6562ec
<__eh_globals_init::~__eh_globals_init()+0xc>
6562e8: 4620 mov r0, r4
6562ea: bd10 pop {r4, pc}
6562ec: 6800 ldr r0, [r0, #0]
6562ee: f04d fe6b bl 6a3fc8 <pthread_key_delete>
6562f2: 4620 mov r0, r4
6562f4: bd10 pop {r4, pc}
0000000010222c30 <__eh_globals_init::~__eh_globals_init()>:
10222c30: 39401001 ldrb w1, [x0, #4]
10222c34: 35000041 cbnz w1, 10222c3c
<__eh_globals_init::~__eh_globals_init()+0xc>
10222c38: d65f03c0 ret
10222c3c: a9bf7bfd stp x29, x30, [sp, #-16]!
10222c40: 910003fd mov x29, sp
return pthread_key_delete (__key);
10222c44: b9400000 ldr w0, [x0]
10222c48: 94008806 bl 10244c60 <pthread_key_delete>
10222c4c: a8c17bfd ldp x29, x30, [sp], #16
10222c50: d65f03c0 ret
