[Bug 20380] Heroes of Might and Magic III hangs

http://bugs.winehq.org/show_bug.cgi?id=20380

--- Comment #80 from Gustaw Smolarczyk   2010-02-19 11:05:55 ---
I'm not familiar with signals and pthread, but I'll try to help somewhat :) I
can easily reproduce this "BUG" on my machine.
It looks like kernel delays a SIGSEGV handler. SIGUSR1 handler is called first
but it's immediatly interrupted by SIGSEGV. I can't see any way how "push ebp"
could generate SIGSEGV (no stack manipulation here), so it's for me the only
explaination.
By blocking SIGSEGV in SIGUSR1 sigaction the BUG disappears, but it's not the
best way, I think. Is the SIGSEGV blocked in the whole handler? Or just pending
SIGSEGVs are blocked for a while?