> On Jun 26, 2017, at 13:25, Konstantin Belousov <kostikbel_at_gmail.com> wrote: > > On Mon, Jun 26, 2017 at 02:53:14PM -0500, Benjamin Kaduk wrote: >> On Sun, Jun 25, 2017 at 11:41 AM, Konstantin Belousov <kostikbel_at_gmail.com> >> wrote: >> >>> No need, I understood why MAP_STACK failed in this case, thanks to the >>> ktrace log. This is indeed something ruby-specific, or rather, triggered >>> by ruby special use of libthr. It is not related to the main stack >>> split. >>> >>> It seems that ruby requested very small stack for a new thread, only 5 >>> pages in size. This size caused the stack gap to be correctly calculated >>> as having zero size, because the whole stack is allocated by initial grow. >>> But then there is no space for the guard page, which caused mapping failure >>> for it, and overall stack mapping failure. >>> >>> Try this. >>> https://people.freebsd.org/~kib/misc/vm2.2.patch >>> >>> >> I managed to get the "Cannot allocate red zone for initial thread" at the >> start of installworld (doing CC feature detection, IIRC) going from r306247 >> to r320328. >> >> Is it worth trying that patch out? > > Ensure that you run a kernel past r320344 and then show me ktrace of > the failing process. So I’m running r320364 with a ZFS root: > uname -a FreeBSD bjrbsd 12.0-CURRENT FreeBSD 12.0-CURRENT #0 r320364: Mon Jun 26 12:35:03 PDT 2017 benno_at_bjrbsd:/src/obj/src/freebsd/sys/GENERIC-NODEBUG amd64 While upgrading I discovered that the zfs command works fine in multiuser but fails in single-user in the way described above: # zfs mount -a Fatal error 'Cannot allocate red zone for initial thread' at line 393 in file /src/freebsd/lib(something)/thread/thr_init.c (errno = 12) Abort trap (core dumped) I booted into single-user and ran zfs under ktrace and I’ve put the results up for you: https://people.freebsd.org/~benno/ktrace.out.txt https://people.freebsd.org/~benno/ktrace.out https://people.freebsd.org/~benno/zfs.coreReceived on Mon Jun 26 2017 - 18:34:42 UTC
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