[Bug 13982] New: rsync calls exit() from signal handler

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=13982

            Bug ID: 13982
           Summary: rsync calls exit() from signal handler
           Product: rsync
           Version: 3.1.3
          Hardware: x64
                OS: NetBSD
            Status: NEW
          Severity: major
          Priority: P5
         Component: core
          Assignee: wayne at opencoder.net
          Reporter: gson at gson.org
        QA Contact: rsync-qa at samba.org

I discovered a hung rsync process on a NetBSD 8.0 server, with the following
backtrace:

#0  0x00007f7ef040ae3a in ___lwp_park60 () from /usr/libexec/ld.elf_so
#1  0x00007f7ef0402728 in _rtld_exclusive_enter
(mask=mask at entry=0x7f7fff9017e0) at /usr/src/libexec/ld.elf_so/rtld.c:1679
#2  0x00007f7ef040339b in _rtld_exit () at
/usr/src/libexec/ld.elf_so/rtld.c:375
#3  0x000077ea83cdfdc2 in __cxa_finalize (dso=dso at entry=0x0) at
/usr/src/lib/libc/stdlib/atexit.c:215
#4  0x000077ea83cdfab3 in exit (status=19) at
/usr/src/lib/libc/stdlib/exit.c:60
#5  0x0000000000414fe1 in ?? ()
#6  0x000000000041bc19 in ?? ()
#7  <signal handler called>
#8  0x00007f7ef0405cd2 in _rtld_find_symdef (flags=1,
defobj_out=0x7f7fff901d80, refobj=0x77ea83fef400, symnum=881) at
/usr/src/libexec/ld.elf_so/symbol.c:343
#9  _rtld_find_plt_symdef (symnum=881, obj=obj at entry=0x77ea83fef400,
defobj=defobj at entry=0x7f7fff901d80, imm=imm at entry=true) at
/usr/src/libexec/ld.elf_so/symbol.c:391
#10 0x00007f7ef0400b34 in _rtld_relocate_plt_object (tp=<synthetic pointer>,
rela=0x77ea83c32e60, obj=0x77ea83fef400)
    at /usr/src/libexec/ld.elf_so/arch/x86_64/mdreloc.c:310
#11 _rtld_bind (obj=0x77ea83fef400, reloff=<optimized out>) at
/usr/src/libexec/ld.elf_so/arch/x86_64/mdreloc.c:346
#12 0x00007f7ef04007cd in _rtld_bind_start () from /usr/libexec/ld.elf_so
#13 0x0000000000000202 in ?? ()
#14 0x00007f7fff901dd0 in ?? ()
#15 0x0000000000000000 in ?? ()

The backtrace suggests, and inspection of the code confirms, that rsync calls
exit() from a signal handler, for example sig_int() -> exit_cleanup() ->
_exit_cleanup() -> exit().  This is incorrect as exit() is not
async-signal-safe.

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