Date: Sun, 8 Jul 2012 17:31:13 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Michael Butler <imb@protected-networks.net> Cc: current@freebsd.org Subject: Re: sleeping thread panic? Message-ID: <20120708143113.GZ2338@deviant.kiev.zoral.com.ua> In-Reply-To: <4FF98F21.9060003@protected-networks.net> References: <4FF98128.6050607@protected-networks.net> <20120708133455.GX2338@deviant.kiev.zoral.com.ua> <4FF98F21.9060003@protected-networks.net>
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On Sun, Jul 08, 2012 at 09:46:09AM -0400, Michael Butler wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>=20
> On 07/08/12 09:34, Konstantin Belousov wrote:
> > On Sun, Jul 08, 2012 at 08:46:32AM -0400, Michael Butler wrote:
> >> Sorry, no symbols but this happened twice last night while being the
> >> target of a dump over NFS ..
> >>
> >> root@mail:/var/crash # less info.0
> >> Dump header from device /dev/ada0s1
> >> Architecture: i386
> >> Architecture Version: 2
> >> Dump Length: 252809216B (241 MB)
> >> Blocksize: 512
> >> Dumptime: Sun Jul 8 00:21:23 2012
> >> Hostname: mail.auburn.protected-networks.net
> >> Magic: FreeBSD Kernel Dump
> >> Version String: FreeBSD 10.0-CURRENT #87: Sat Jul 7 22:39:55 EDT 20=
12
> >> root@mail.auburn.protected-networks.net:/usr/obj/usr/src/sys/AUBURN
> >> Panic String: sleeping thread
> >> Dump Parity: 2996346376
> >> Bounds: 0
> >> Dump Status: good
> >>
> >>
> >> (kgdb) bt
> >> #0 0xc07530cd in doadump ()
> >> #1 0xc0753656 in kern_reboot ()
> >> #2 0xc0753cfc in panic ()
> >> #3 0xc079a34e in propagate_priority ()
> >> #4 0xc079b5e4 in turnstile_wait ()
> >> #5 0xc073ea71 in _mtx_lock_sleep ()
> >> #6 0xc09c4772 in vm_page_unwire ()
> >> #7 0xc07db039 in vfs_vmio_release ()
> >> #8 0xc07dd476 in getnewbuf ()
> >> #9 0xc07de50b in getblk ()
> >> #10 0xc0966d99 in ffs_balloc_ufs2 ()
> >> #11 0xc099281e in ffs_write ()
> >> #12 0xc0a38b05 in VOP_WRITE_APV ()
> >> #13 0xc068a65e in nfsvno_write ()
> >> #14 0xc06882e7 in nfsrvd_write ()
> >> #15 0xc066ea05 in nfsrvd_dorpc ()
> >> #16 0xc067d42f in nfssvc_program ()
> >> #17 0xc09356e2 in svc_run_internal ()
> >> #18 0xc0935b70 in svc_thread_start ()
> >> #19 0xc07204fb in fork_exit ()
> >> #20 0xc09fe7a4 in fork_trampoline ()
> >=20
> > You need to provide:
> > 1. exact version of your kernel sources
>=20
> This is the CVS equivalent of SVN r238221
>=20
> > 2. complete panic message. There should be backtrace of the 'sleeping
> > thread', not the paniced thread, right after the panic message.
> >=20
>=20
> Sorry, that is the entire info file - nothing more than I've posted is
> logged,
Catch it next time ? This should be quite reproducable, if real.
Actually, try this.
diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c
index 9485fdd..de33afc 100644
--- a/sys/vm/vm_pageout.c
+++ b/sys/vm/vm_pageout.c
@@ -1030,7 +1030,6 @@ rescan0:
++pageout_lock_miss;
if (object->flags & OBJ_MIGHTBEDIRTY)
vnodes_skipped++;
- vm_page_lock_queues();
goto unlock_and_continue;
}
KASSERT(mp !=3D NULL,
@@ -1041,7 +1040,6 @@ rescan0:
if (vget(vp, LK_EXCLUSIVE | LK_TIMELOCK,
curthread)) {
VM_OBJECT_LOCK(object);
- vm_page_lock_queues();
++pageout_lock_miss;
if (object->flags & OBJ_MIGHTBEDIRTY)
vnodes_skipped++;
@@ -1082,15 +1080,17 @@ rescan0:
* If the page has become held it might
* be undergoing I/O, so skip it
*/
+ KASSERT(queues_locked, ("unlocked queues 2"));
+ mtx_assert(&vm_page_queue_mtx, MA_OWNED);
if (m->hold_count) {
- vm_page_lock_queues();
- queues_locked =3D TRUE;
vm_page_unlock(m);
vm_page_requeue(m);
if (object->flags & OBJ_MIGHTBEDIRTY)
vnodes_skipped++;
goto unlock_and_continue;
}
+ vm_page_unlock_queues();
+ queues_locked =3D FALSE;
}
=20
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