Date: Fri, 25 Oct 2013 00:15:07 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Roger Pau Monn? <roger.pau@citrix.com> Cc: Outback Dingo <outbackdingo@gmail.com>, current@freebsd.org Subject: Re: CUREENT issue with ballon.c Message-ID: <20131024211507.GD10625@kib.kiev.ua> In-Reply-To: <526986E0.2050807@citrix.com> References: <CAKYr3zyVXxL9A9wEY_KL8sp1yivAUG2gpK8daUMu%2BbeyU2b8pw@mail.gmail.com> <5268F37E.9050004@citrix.com> <CAKYr3zw5Se4Z-fZLgp9e9nBMxWNhXuwt1%2BTAqZJeozt=qhpmpQ@mail.gmail.com> <526986E0.2050807@citrix.com>
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--GpGaEY17fSl8rd50 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Oct 24, 2013 at 09:45:20PM +0100, Roger Pau Monn? wrote: > On 24/10/13 13:01, Outback Dingo wrote: > >=20 > >=20 > > On Thu, Oct 24, 2013 at 6:16 AM, Roger Pau Monn? <roger.pau@citrix.com > > <mailto:roger.pau@citrix.com>> wrote: > >=20 > > On 24/10/13 03:02, Outback Dingo wrote: > > > --- trap 0, rip =3D 0, rsp =3D 0xfffffe00002c6b70, rbp =3D 0 --- > > > uma_zalloc_arg: zone "16" with the following non-sleepable locks = held: > > > exclusive sleep mutex balloon_lock (balloon_lock) r =3D 0 > > > (0xffffffff816e9c58) locked @ > > /usr/src/sys/dev/xen/balloon/balloon.c:339 > > > exclusive sleep mutex balloon_mutex (balloon_mutex) r =3D 0 > > > (0xffffffff816e9c38) locked @ > > /usr/src/sys/dev/xen/balloon/balloon.c:373 > > > KDB: stack backtrace: > > > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame > > > 0xfffffe00002c67c0 > > > kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe00002c6870 > > > witness_warn() at witness_warn+0x4a8/frame 0xfffffe00002c6930 > > > uma_zalloc_arg() at uma_zalloc_arg+0x3b/frame 0xfffffe00002c69a0 > > > malloc() at malloc+0x101/frame 0xfffffe00002c69f0 > > > balloon_process() at balloon_process+0x44a/frame 0xfffffe00002c6a= 70 > > > fork_exit() at fork_exit+0x84/frame 0xfffffe00002c6ab0 > > > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00002c6ab0 > > > --- trap 0, rip =3D 0, rsp =3D 0xfffffe00002c6b70, rbp =3D 0 --- > > > uma_zalloc_arg: zone "16" with the following non-sleepable locks = held: > > > exclusive sleep mutex balloon_lock (balloon_lock) r =3D 0 > > > (0xffffffff816e9c58) locked @ > > /usr/src/sys/dev/xen/balloon/balloon.c:339 > > > exclusive sleep mutex balloon_mutex (balloon_mutex) r =3D 0 > > > (0xffffffff816e9c38) locked @ > > /usr/src/sys/dev/xen/balloon/balloon.c:373 > > > KDB: stack backtrace: > > > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame > > > 0xfffffe00002c67c0 > > > kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe00002c6870 > > > witness_warn() at witness_warn+0x4a8/frame 0xfffffe00002c6930 > > > uma_zalloc_arg() at uma_zalloc_arg+0x3b/frame 0xfffffe00002c69a0 > > > malloc() at malloc+0x101/frame 0xfffffe00002c69f0 > > > balloon_process() at balloon_process+0x44a/frame 0xfffffe00002c6a= 70 > > > fork_exit() at fork_exit+0x84/frame 0xfffffe00002c6ab0 > > > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00002c6ab0 > > > --- trap 0, rip =3D 0, rsp =3D 0xfffffe00002c6b70, rbp =3D 0 --- > > > uma_zalloc_arg: zone "16" with the following non-sleepable locks = held: > >=20 > > Did you do anything specific to trigger the crash? Can you explain = the > > steps needed to reproduce it? > >=20 > >=20 > > just recompiled a kernel, and booted it scrolls continuously across the > > screen > > doesnt seem to ever stop.=20 >=20 > I've tried r257051 and it seems to work fine, could you please post your > Xen version, the config file used to launch the VM and the toolstack used? Do you have witness enabled in your kernel config ? There is an obvious case of calling malloc(M_WAITOK) while holding both balloon_lock and balloon_mutex: ballon_process->decrease_reservation->balloon_append. --GpGaEY17fSl8rd50 Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (FreeBSD) iQIcBAEBAgAGBQJSaY3aAAoJEJDCuSvBvK1BjZgP/0v6+ewwHLndjqQoYIKL93sf ZZe3xXPOn+1Kgrh5t5cFYGRqtlngeBfcbRRdlufaZCon3IJ+9qwZvGcd9/sa7LAc +pxBb5cJTabNL/WXbyeRVhnZmv/rSFYDm9QxDNY1egvBNcB08AoBBl7bYy6R9I5c t1WmpySCTgFjv282sgra9kV80VvdbzS3AMQLgNXFABd83ZjbEoeXAC4G8OCLecJQ B40MgEL3ncsRB3cKT2ivPM6a+UEdQI40ARMM9wagDVbAR6fCjo7QHhoFZ5jPjxVZ GPGVRaJxa82zZcnKA2b4YbOh5nGc7i4iXfQ7VWpu3sD8Z8EQcRmCtvaTosX9WkDF WKlJObac2Fj9osHNBTZjzTbOKoqVyDXSsadjRg0Rcmn4SIpXHinNj7FnDVyx5E9k j6xoWlFNVlXxtRBYxKTcKAKfhgsHKsftWVEffD/YYtKpogkckp03vuhLL7beDUUy p+0ugTOGUp9FHrnblwzbwn46eTTAFXT5kwO2tF9LltuhHWrDp3m+a+8Xiftu1u6c phM1xVG3TDVNQaiY37vKKLrTgHdEhQ6Q6VEUCvoaLMWOxAjDKqwPEREPc6hXth96 TGeCCn8IV0F+o61HaL64V8yZ357k4YK4QvbEOvySTEhTfgXRGcuvkHgHu1DSBQi3 WbWjLADaRpva0pKkHj+D =XQAY -----END PGP SIGNATURE----- --GpGaEY17fSl8rd50--
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