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Message-ID: <4E5E6A75.5030404@localhost>
Date: Wed, 31 Aug 2011 10:08:05 -0700
From: Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
To: linux-rt-users <linux-rt-users@...r.kernel.org>
CC: LKML <linux-kernel@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
"Paul E. McKenney" <paulmck@...ibm.com>, efault@....de,
Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
Subject: 3.0.4 + rt12: deadlock
Booting 3.0.4 + rt12 on a quadcore workstation (running fc14) gave me this:
----
=============================================
[ INFO: possible recursive locking detected ]
3.0.4-1.rt12.1.fc14.ccrma.i686.rtPAE #1
---------------------------------------------
swapper/0 is trying to acquire lock:
(&parent->list_lock){+.+...}, at: [<c05054ce>]
__cache_free.clone.27+0x45/0xc4
but task is already holding lock:
(&parent->list_lock){+.+...}, at: [<c050662c>] do_tune_cpucache+0xf0/0x2b0
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&parent->list_lock);
lock(&parent->list_lock);
*** DEADLOCK ***
May be due to missing lock nesting notation
3 locks held by swapper/0:
#0: (cache_chain_mutex){+.+...}, at: [<c0bedb96>]
kmem_cache_init_late+0x15/0x61
#1: (&per_cpu(slab_lock, __cpu).lock){+.+...}, at: [<c0504a53>]
__local_lock_irq+0x1e/0x5b
#2: (&parent->list_lock){+.+...}, at: [<c050662c>]
do_tune_cpucache+0xf0/0x2b0
stack backtrace:
Pid: 0, comm: swapper Not tainted 3.0.4-1.rt12.1.fc14.ccrma.i686.rtPAE #1
Call Trace:
[<c086e6f6>] ? printk+0x2d/0x2f
[<c0479b36>] __lock_acquire+0x8b3/0xc2f
[<c086fd96>] ? rt_spin_lock_slowlock+0x67/0x170
[<c04790ee>] ? mark_lock+0x26/0x1bb
[<c05054ce>] ? __cache_free.clone.27+0x45/0xc4
[<c047a372>] lock_acquire+0xde/0x11d
[<c05054ce>] ? __cache_free.clone.27+0x45/0xc4
[<c08703b4>] rt_spin_lock+0x3d/0x43
[<c05054ce>] ? __cache_free.clone.27+0x45/0xc4
[<c05054ce>] __cache_free.clone.27+0x45/0xc4
[<c0437c83>] ? test_ti_thread_flag+0x8/0x10
[<c0505303>] kmem_cache_free+0x73/0xe1
[<c05053c0>] slab_destroy+0x4f/0x53
[<c0505458>] free_block+0x94/0xc5
[<c0506645>] do_tune_cpucache+0x109/0x2b0
[<c05069c7>] enable_cpucache+0x7b/0xa7
[<c0bedba7>] kmem_cache_init_late+0x26/0x61
[<c0bcd68a>] start_kernel+0x24f/0x367
[<c0bcd1d1>] ? loglevel+0x1a/0x1a
[<c0bcd13b>] ? reserve_ebda_region+0x70/0x72
[<c0bcd0c3>] i386_start_kernel+0xb2/0xba
Console: colour VGA+ 80x25
console [tty0] enabled
Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
... MAX_LOCKDEP_SUBCLASSES: 8
... MAX_LOCK_DEPTH: 48
... MAX_LOCKDEP_KEYS: 8191
... CLASSHASH_SIZE: 4096
... MAX_LOCKDEP_ENTRIES: 32768
... MAX_LOCKDEP_CHAINS: 65536
... CHAINHASH_SIZE: 32768
----
I started working and a little while later the machine froze (jack +
heavy prioritized udp traffic in eth1 - with the r8169 driver). It
recognized alt-sysrq boot so it was not completely dead. Nothing left on
the logs to see.
Full config attached.
-- Fernando
Download attachment "config.bz2" of type "application/x-bzip" (28822 bytes)
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