The process that receives many SIGSTOP/SIGCONT signals sometimes hangs on exit in sig_dispatch_pending(). This patch avoids processing signals in sig_dispatch_pending() as if __SIGFLASHFAST is used.
Addresses: https://cygwin.com/pipermail/cygwin/2025-February/257473.html Fixes: d243e51ef1d3 ("Cygwin: signal: Fix deadlock between main thread and sig thread") Reported-by: Christian Franke <christian.fra...@t-online.de> Signed-off-by: Takashi Yano <takashi.y...@nifty.ne.jp> --- winsup/cygwin/sigproc.cc | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/winsup/cygwin/sigproc.cc b/winsup/cygwin/sigproc.cc index 8739f18f5..7cfa37d8f 100644 --- a/winsup/cygwin/sigproc.cc +++ b/winsup/cygwin/sigproc.cc @@ -743,7 +743,8 @@ sig_send (_pinfo *p, siginfo_t& si, _cygtls *tls) } unsigned cw_mask; - cw_mask = pack.si.si_signo == __SIGFLUSHFAST ? 0 : cw_sig_restart; + cw_mask = + (pack.si.si_signo == __SIGFLUSHFAST || exit_state) ? 0 : cw_sig_restart; DWORD nb; BOOL res; -- 2.45.1
