On Wed, 21 Oct 2020 18:28:44 +0300 Konstantin Belousov <kostik...@gmail.com> wrote:
> > > > kdump with MAP_STACK. > > > > 87183 polyimport CALL > > mmap(0,0x1000,0x3<PROT_READ|PROT_WRITE>,0x1402<MAP_PRIVATE|MAP_STACK|MAP_ANON>,0xffffffff,0,0) > > 87183 polyimport RET mmap -1 errno 22 Invalid argument > So it is anything but 'insufficient memory' (I suspected ENOMEM). > EINVAL there is because sysctl security.bsd.stack_guard_page default value > is 1, which means that at least one page of the stack is reserved as guard. > Kernel does not allow to map stack that would have no data pages (all pages > are guard). > > Your mapping request is for one page, and one page is due to guard, so > you get EINVAL. Generally MAP_STACK is magic and requires caller to know > what it does. Thanks! _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
