Date: Tue, 19 Feb 2013 09:32:56 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Alfred Perlstein <alfred@ixsystems.com> Cc: Xin Li <delphij@delphij.net>, fs@freebsd.org Subject: Re: Advisory lock crashes. Message-ID: <20130219073256.GV2598@kib.kiev.ua> In-Reply-To: <512324F2.4060707@ixsystems.com> References: <512324F2.4060707@ixsystems.com>
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On Mon, Feb 18, 2013 at 11:08:34PM -0800, Alfred Perlstein wrote:
> Hello Konstantin & Doug,
>=20
> We're getting a few crashes in what looks to be kern_lockf.c:
>=20
> fault address here is 0x360 which appears to mean that the "sx" owner=20
> thread is NULL
What is the version of FreeBSD ?
What is the filesystem owning the file which was advlocked ?
Show the line number for lf_advlockasync+0x5d7.
No, I never saw nothing similar in last 3 years.
>=20
> db> bt
> Tracing pid 5099 tid 101614 td 0xfffffe005d54e8c0
> _sx_xlock_hard() at _sx_xlock_hard+0xb3
> lf_advlockasync() at lf_advlockasync+0x5d7
> lf_advlock() at lf_advlock+0x47
> vop_stdadvlock() at vop_stdadvlock+0xb3
> VOP_ADVLOCK_APV() at VOP_ADVLOCK_APV+0x4a
> closef() at closef+0x352
> kern_close() at kern_close+0x172
> amd64_syscall() at amd64_syscall+0x58a
> Xfast_syscall() at Xfast_syscall+0xf7
> --- syscall (6, FreeBSD ELF64, sys_close), rip =3D 0x8011651fc, rsp =3D 0=
x7fffffbfdd58, rbp =3D 0x807c3d6c0 ---
>=20
> (kgdb) list *(_sx_xlock_hard+0xb3)
> 0xffffffff806242c3 is in _sx_xlock_hard=20
> (/usr/home/jpaetzel/9.0.6-RELEASE-p1/FreeBSD/src/sys/kern/kern_sx.c:514).
> 509 x =3D sx->sx_lock;
> 510 if ((sx->lock_object.lo_flags & SX_NOADAPTIVE)=20
> =3D=3D 0) {
> 511 if ((x & SX_LOCK_SHARED) =3D=3D 0) {
> 512 x =3D SX_OWNER(x);
> 513 owner =3D (struct thread *)x;
> 514 if (TD_IS_RUNNING(owner)) {
> 515 if=20
> (LOCK_LOG_TEST(&sx->lock_object, 0))
> 516 CTR3(KTR_LOCK,
> 517 "%s: spinning on %p=
=20
> held by %p",
> 518 __func__, sx, owner);
>=20
>=20
> Another panic here, which we have less information is attached as an imag=
e.
>=20
> We're looking at using some INVARIANTS and WITNESS kernels, but was=20
> wondering if y'all had any other suggestions to use please?
>=20
> thank you,
> -Alfred
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