[Bug nptl/22563] New: __cancel_jmp_buf in __pthread_unwind_buf_t is incompatible with setjmp/longmp

[hjl.tools at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22563

            Bug ID: 22563
           Summary: __cancel_jmp_buf in __pthread_unwind_buf_t is
                    incompatible with setjmp/longmp
           Product: glibc
           Version: 2.27
            Status: NEW
          Severity: normal
          Priority: P2
         Component: nptl
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

sysdeps/nptl/pthread.h has

/* Cancellation handling with integration into exception handling.  */

typedef struct
{
  struct
  {
    __jmp_buf __cancel_jmp_buf;
    int __mask_was_saved;
  } __cancel_jmp_buf[1];
  void *__pad[4];
} __pthread_unwind_buf_t __attribute__ ((__aligned__));


But setjmp/setjmp.h has

/* Calling environment, plus possibly a saved signal mask.  */
struct __jmp_buf_tag
  {
    /* NOTE: The machine-dependent definitions of `__sigsetjmp'
       assume that a `jmp_buf' begins with a `__jmp_buf' and that
       `__mask_was_saved' follows it.  Do not move these members
       or add others before it.  */
    __jmp_buf __jmpbuf;         /* Calling environment.  */
    int __mask_was_saved;       /* Saved the signal mask?  */
    __sigset_t __saved_mask;    /* Saved signal mask.  */
  };  

__sigset_t is missing from __cancel_jmp_buf.

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