Date: Thu, 26 Apr 2018 12:05:53 -0400 From: Lowell Gilbert <freebsd-stable-local@be-well.ilk.org> To: Dimitry Andric <dim@FreeBSD.org> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: gptboot broken when compiled with clang 6 and WITHOUT_LOADER_GELI -- clang 5 is OK Message-ID: <44tvry9cm6.fsf@be-well.ilk.org> In-Reply-To: <55C3B174-0A2B-4954-BEB8-BF6688EBB02D@FreeBSD.org> (Dimitry Andric's message of "Thu, 26 Apr 2018 13:45:51 %2B0200") References: <20180425165840.GA1330@bali> <fd725966-e7c2-28e8-cea5-68473ad7b00d@heuristicsystems.com.au> <3A857D03-607A-4983-A4C2-D3A93119297A@FreeBSD.org> <55C3B174-0A2B-4954-BEB8-BF6688EBB02D@FreeBSD.org>
next in thread | previous in thread | raw e-mail | index | archive | help
Dimitry Andric <dim@FreeBSD.org> writes: > On 26 Apr 2018, at 12:06, Dimitry Andric <dim@FreeBSD.org> wrote: >> >> On 26 Apr 2018, at 06:17, Dewayne Geraghty <dewayne.geraghty@heuristicsystems.com.au> wrote: >>> >>> Andre, You're not alone. I think there's a problem with clang6 on i386 >>> FreeBSD 11.1X, refer: >>> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227552 >>> https://forums.freebsd.org/threads/uptime-w-i386-breakage.65584/ >>> and perhaps also on amd64, search for >>> https://bugs.freebsd.org/bugzilla/buglist.cgi?quicksearch=clang&list_id=226390. >>> >>> Without time to investigate I've reverted userland >>> FreeBSD 11.2-PRERELEASE r332843M amd64 1101515 1101509 >>> FreeBSD 11.2-PRERELEASE r332843M i386 1101515 1101509 >> >> As noted in another post, I cannot reproduce the problems with gptboot, >> but with FreeBSD-11.2-PRERELEASE-i386-20180420-r332802, I do indeed see >> w and uptime crashing in libxo: >> >> (gdb) bt >> #0 ifree (tsd=0x28000000) at arena.h:799 >> #1 0x2814b506 in __free (ptr=0x280601ef) at tsd.h:716 >> #2 0x2808bb07 in xo_do_emit_fields () at /usr/src/contrib/libxo/libxo/libxo.c:6419 >> #3 0x28089a1c in xo_do_emit (xop=<value optimized out>, flags=<value >> optimized out>, fmt=0x804ad4d "{:time-of-day/%s} ") at >> /usr/src/contrib/libxo/libxo/libxo.c:6470 >> #4 0x28089b61 in xo_emit (fmt=0x804ad4d "{:time-of-day/%s} ") at /usr/src/contrib/libxo/libxo/libxo.c:6541 >> #5 0x08049f50 in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/usr.bin/w/w.c:475 >> #6 0x080494cd in _start1 () >> #7 0x08049448 in _start () >> #8 0x00000000 in ?? () >> >> Not sure if this has anything to do with clang though, it looks more >> like a double free to me, at first glance. I'll do some debugging. > > Strangely, simply recompiling libxo fixes the problem, or at least works > around it. This is on the r332802 snapshot, so I guess the libxo.so.0 > file shipped may be broken, somehow. Actually, that is a recurring bug (https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=227552) and does seem to be some kind of initialization problem with clang.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?44tvry9cm6.fsf>