Date: Tue, 27 Aug 2019 08:02:57 +0000 (UTC) From: "mms.vanbreukelingen@gmail.com" <mms.vanbreukelingen@gmail.com> To: "kostikbel@gmail.com" <kostikbel@gmail.com>, maksim yevmenkin <maksim.yevmenkin@gmail.com> Cc: Warner Losh <imp@bsdimp.com>, Hans Petter Selasky <hps@selasky.org>, "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: Re: Kernel-Crash when working with ubt0 Message-ID: <233039408.1857163.1566892977201@mail.yahoo.com> In-Reply-To: <20190827071052.GT71821@kib.kiev.ua> References: <47509401.1440476.1566796167857.ref@mail.yahoo.com> <47509401.1440476.1566796167857@mail.yahoo.com> <5aa8faeb-5e8e-38be-4301-81f3d82c494a@selasky.org> <CANCZdfpJARVFz%2BCyvbAK9sH4E6__DPAunYQz5rxexO-mzuvsuw@mail.gmail.com> <00E772F0-7231-44C4-B314-26730CC7DF21@gmail.com> <20190827071052.GT71821@kib.kiev.ua>
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------=_Part_1857162_770114156.1566892977201 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable =20 On Tue, 27 Aug 2019 at 9:11, Konstantin Belousov<kostikbel@gmail.com> wro= te: On Mon, Aug 26, 2019 at 02:35:25PM -0700, maksim yevmenkin wrote: >=20 >=20 > > On Aug 26, 2019, at 9:14 AM, Warner Losh <imp@bsdimp.com> wrote: > >=20 > > Is it from read_connection_list? If so I have a 'patch' that I'm using = but > > haven't committed because it's just too gross: drop the lock before the > > copyout and pick it up again after... > >=20 >=20 > Hmm... interesting....=20 >=20 > I only took a brief look at it. I suppose I can ensure user space address= is wired and then copyout() can be called with mutex held >No, you cannot do this, at least without making the kernel to panic. User might unmap the wired mapping at any time still. Is it a userspace specific issue,=C2=A0 I don't think so?=C2=A0 It's a page= fault because of aquired lock.=C2=A0 Well,=C2=A0 I try two things this evening:=C2=A0 1. I do the patch manually cut'n paste,=C2=A0 as git --diff is a weired thi= ng,=C2=A0 especially when you come from Arch - but ok,=C2=A0 I give this a = try.=C2=A0 2. Recompile with option MTX_SPIN=3Dy at the config at /usr/src/head/sys/x8= 6_64/conf/MIRANDA,=C2=A0 make with INSTKERNNAME=3DXYZ compiles ok,=C2=A0 but you just get an M at th= e reversion#, just the CURRENT appears with "uname -a". Would be a bit arro= gant,=C2=A0 insulant and egoistic calling our Kernel by your first name and= Helling everyone you've coded it,=C2=A0 IMO.=C2=A0 Btw,=C2=A0 you can't just mix up LINT and "stock" together,=C2=A0 since I d= id,=C2=A0 I know what the long run of -1=F0=9F=98=AD means. Not a cool thin= g,=C2=A0 when compiling 8 hours at a (3rd,=C2=A0 to be honest)=C2=A0 world = and then the kernel built just can't bootstrap.=C2=A0=C2=A0 I also built two worlds 28 simultaniously from different sources and compar= ed installation. mergemaster's -Ui (or -p) always's to be done at Single Mo= de with remounting root rw, system is very vulnerable at the moment masterp= wd is constructed and groups are merged (this not in Single Mode as it need= s the ELF64 for merging correctly (right?) and dbus missing some users afte= rwards normally. I had to recreate user not just once and to chown 775 it.= =C2=A0 It has something from an abortion when turning on after install Kernel and = screen remains black. This is what all of US fear.=C2=A0 zcat under Linux c= an be a black cat... >=20 > It=E2=80=99s odd that I=E2=80=99ve never seen this before. I=E2=80=99m tr= aveling at the moment will take a closer look this later this week >=20 > Thanks > Max > _______________________________________________ > freebsd-current@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org= " =20 ------=_Part_1857162_770114156.1566892977201 Content-Type: text/plain Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="Untitled" Content-ID: <72cb6152-947f-44d4-ab63-6e9efaabaf5a> T24gTW9uLCBBdWcgMjYsIDIwMTkgYXQgMDI6MzU6MjVQTSAtMDcwMCwgbWFrc2ltIHlldm1lbmtp biB3cm90ZToKPiAKPiAKPiA+IE9uIEF1ZyAyNiwgMjAxOSwgYXQgOToxNCBBTSwgV2FybmVyIExv c2ggPGltcEBic2RpbXAuY29tPiB3cm90ZToKPiA+IAo+ID4gSXMgaXQgZnJvbSByZWFkX2Nvbm5l Y3Rpb25fbGlzdD8gSWYgc28gSSBoYXZlIGEgJ3BhdGNoJyB0aGF0IEknbSB1c2luZyBidXQKPiA+ IGhhdmVuJ3QgY29tbWl0dGVkIGJlY2F1c2UgaXQncyBqdXN0IHRvbyBncm9zczogZHJvcCB0aGUg bG9jayBiZWZvcmUgdGhlCj4gPiBjb3B5b3V0IGFuZCBwaWNrIGl0IHVwIGFnYWluIGFmdGVyLi4u Cj4gPiAKPiAKPiBIbW0uLi4gaW50ZXJlc3RpbmcuLi4uIAo+IAo+IEkgb25seSB0b29rIGEgYnJp ZWYgbG9vayBhdCBpdC4gSSBzdXBwb3NlIEkgY2FuIGVuc3VyZSB1c2VyIHNwYWNlIGFkZHJlc3Mg aXMgd2lyZWQgYW5kIHRoZW4gY29weW91dCgpIGNhbiBiZSBjYWxsZWQgd2l0aCBtdXRleCBoZWxk CgpObywgeW91IGNhbm5vdCBkbyB0aGlzLCBhdCBsZWFzdCB3aXRob3V0IG1ha2luZyB0aGUga2Vy bmVsIHRvIHBhbmljLgpVc2VyIG1pZ2h0IHVubWFwIHRoZSB3aXJlZCBtYXBwaW5nIGF0IGFueSB0 aW1lIHN0aWxsLgoKPiAKPiBJdOKAmXMgb2RkIHRoYXQgSeKAmXZlIG5ldmVyIHNlZW4gdGhpcyBi ZWZvcmUuIEnigJltIHRyYXZlbGluZyBhdCB0aGUgbW9tZW50IHdpbGwgdGFrZSBhIGNsb3NlciBs b29rIHRoaXMgbGF0ZXIgdGhpcyB3ZWVrCj4gCj4gVGhhbmtzCj4gTWF4Cj4gX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KPiBmcmVlYnNkLWN1cnJlbnRAZnJl ZWJzZC5vcmcgbWFpbGluZyBsaXN0Cj4gaHR0cHM6Ly9saXN0cy5mcmVlYnNkLm9yZy9tYWlsbWFu L2xpc3RpbmZvL2ZyZWVic2QtY3VycmVudAo+IFRvIHVuc3Vic2NyaWJlLCBzZW5kIGFueSBtYWls IHRvICJmcmVlYnNkLWN1cnJlbnQtdW5zdWJzY3JpYmVAZnJlZWJzZC5vcmciCg== ------=_Part_1857162_770114156.1566892977201--
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