FreeBSD: sleeper using ppoll does not sleep forever

[Mykola Golub <trociny@FreeBSD.org>]

Hi,

I have been observing the following assertion failure when starting
cmogstored on recent versions of FreeBSD:

  Assertion failed: (0 && "init_once did not get cancelled"), function init_once, file mnt.c, line 139.

On these versions ppoll is available and the crush is observed only
when built with HAVE_PPOLL.

According to ktrace, ppoll (called by sleeper) returns immediately
with EINTR:

 86352 cmogstored CALL  ppoll(0,0,0,0x63dc28)
 86352 cmogstored CALL  thr_kill(0x18f47,SIG 32)
 86352 cmogstored RET   thr_kill 0
 86352 cmogstored RET   ppoll -1 errno 4 Interrupted system call
 86352 cmogstored PSIG  SIG 32 caught handler=0x800867f30 mask=0x7ffefeff code=SI_LWP
 86352 cmogstored CALL  _umtx_op(0x801406800,UMTX_OP_WAIT,0x18f47,0,0)
 86352 cmogstored CALL  sigreturn(0x7fffdfffdb40)
 86352 cmogstored RET   sigreturn JUSTRETURN
 86352 cmogstored CALL  write(0x2,0x7fffdfffd900,0x66)
 86352 cmogstored GIO   fd 2 wrote 102 bytes
       "Assertion failed: (0 && "init_once did not get cancelled"), function init_once, file mnt.c, line 13\
        9.
       "
I have workarounded this by building without HAVE_PPOLL.

-- 
Mykola Golub