Date: Sun, 6 Jul 2014 15:46:22 +0000 From: Steve Wills <swills@freebsd.org> To: current@freebsd.org, virtualization@freebsd.org Subject: Re: tmpfs panic Message-ID: <20140706154621.GA81830@mouf.net> In-Reply-To: <20140706135333.GA80856@mouf.net> References: <20140706135333.GA80856@mouf.net>
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I should have noted this system is running in bhyve. Also I'm told this pan=
ic
may be related to the fact that the system is running in bhyve.
Looking at it a little more closely:
(kgdb) list *__mtx_lock_sleep+0xb1
0xffffffff809638d1 is in __mtx_lock_sleep (/usr/src/sys/kern/kern_mutex.c:4=
31).
426 * owner stops running or the state of the lock cha=
nges.
427 */
428 v =3D m->mtx_lock;
429 if (v !=3D MTX_UNOWNED) {
430 owner =3D (struct thread *)(v & ~MTX_FLAGMA=
SK);
431 if (TD_IS_RUNNING(owner)) {
432 if (LOCK_LOG_TEST(&m->lock_object, =
0))
433 CTR3(KTR_LOCK,
434 "%s: spinning on %p hel=
d by %p",
435 __func__, m, owner);
(kgdb)=20
I'm told that MTX_CONTESTED was set on the unlocked mtx and that MTX_CONTEN=
DED
is spuriously left behind, and to ask how lock prefix is handled in bhyve. =
Any
of that make sense to anyone?
Thanks,
Steve
On Sun, Jul 06, 2014 at 01:53:37PM +0000, Steve Wills wrote:
> Hi,
>=20
> Just experienced this tmpfs panic on r268160:
>=20
> Freed UMA keg (TMPFS node) was not empty (16 items). Lost 1 pages of mem=
ory.
>=20
>=20
> Fatal trap 12: page fault while in kernel mode
> cpuid =3D 12; apic id =3D 0c
> fault virtual address =3D 0x378
> fault code =3D supervisor read data, page not present
> instruction pointer =3D 0x20:0xffffffff809638d1
> stack pointer =3D 0x28:0xfffffe07243800a0
> frame pointer =3D 0x28:0xfffffe0724380120
> code segment =3D base 0x0, limit 0xfffff, type 0x1b
> =3D DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags =3D interrupt enabled, resume, IOPL =3D 0
> current process =3D 65339 (pkg-static)
> [ thread pid 65339 tid 101641 ]
> Stopped at __mtx_lock_sleep+0xb1: movl 0x378(%rax),%ecx
> db> bt
> Tracing pid 65339 tid 101641 td 0xfffff80286b2e490
> __mtx_lock_sleep() at __mtx_lock_sleep+0xb1/frame 0xfffffe0724380120
> free_unr() at free_unr+0x9d/frame 0xfffffe0724380160
> tmpfs_free_node() at tmpfs_free_node+0xf2/frame 0xfffffe07243801a0
> tmpfs_reclaim() at tmpfs_reclaim+0xdc/frame 0xfffffe07243801d0
> VOP_RECLAIM_APV() at VOP_RECLAIM_APV+0xa7/frame 0xfffffe0724380200
> vgonel() at vgonel+0x24c/frame 0xfffffe0724380280
> vrecycle() at vrecycle+0x84/frame 0xfffffe07243802c0
> tmpfs_inactive() at tmpfs_inactive+0x18/frame 0xfffffe07243802d0
> VOP_INACTIVE_APV() at VOP_INACTIVE_APV+0xa7/frame 0xfffffe0724380300
> vinactive() at vinactive+0x181/frame 0xfffffe0724380360
> vputx() at vputx+0x30d/frame 0xfffffe07243803d0
> vn_close() at vn_close+0x13e/frame 0xfffffe0724380450
> vn_closefile() at vn_closefile+0x48/frame 0xfffffe07243804d0
> _fdrop() at _fdrop+0x29/frame 0xfffffe07243804f0
> closef() at closef+0x2ae/frame 0xfffffe0724380580
> fdescfree() at fdescfree+0x64c/frame 0xfffffe0724380630
> exit1() at exit1+0x682/frame 0xfffffe07243806c0
> sigexit() at sigexit+0x929/frame 0xfffffe0724380980
> postsig() at postsig+0x3c4/frame 0xfffffe0724380a70
> ast() at ast+0x487/frame 0xfffffe0724380ab0
> doreti_ast() at doreti_ast+0x1f/frame 0x7fffffffc6e0
> db>=20
>=20
> Any further debugging I can do?
>=20
> Thanks,
> Steve
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