netdev - [BUG][AX25] 2.6.28.5 "inconsistent lock state" (2 CPUs / SMP enabled)

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Date:	Sun, 3 May 2009 10:06:23 +0200
From:	"Jann Traschewski" <jann@....de>
To:	<netdev@...r.kernel.org>
Subject: [BUG][AX25] 2.6.28.5 "inconsistent lock state" (2 CPUs / SMP enabled)

Hi,

the AX.25 code has still some problems with SMP and locking. I turned on
lock debugging on my machine with a lot of AX.25 traffic. Although it did
take serveral days until I got this:

=================================
[ INFO: inconsistent lock state ]
2.6.28.5-dg8ngn #1
---------------------------------
inconsistent {softirq-on-R} -> {in-softirq-W} usage.
swapper/0 [HC0[0]:SC1[2]:HE1:SE0] takes:
 (clock-AF_AX25){-+-?}, at: [<f859ed33>] ax25_destroy_socket+0xb6/0x1c4
[ax25]
{softirq-on-R} state was registered at:
  [<c013a751>] __lock_acquire+0x4e4/0x65e
  [<c0124d14>] local_bh_enable+0xa5/0xa9
  [<c013a914>] lock_acquire+0x49/0x61
  [<c025a221>] sock_def_wakeup+0x11/0x3d
  [<c02ca449>] _read_lock+0x19/0x24
  [<c025a221>] sock_def_wakeup+0x11/0x3d
  [<c025a221>] sock_def_wakeup+0x11/0x3d
  [<f859fb9c>] ax25_release+0x17e/0x1ab [ax25]
  [<c025847f>] sock_release+0x11/0x59
  [<c0258883>] sock_close+0x19/0x1c
  [<c0165ced>] __fput+0xbe/0x169
  [<c0163a43>] filp_close+0x4d/0x53
  [<c0121df6>] put_files_struct+0x5f/0xa7
  [<c0122ddc>] do_exit+0x187/0x669
  [<c0103840>] restore_nocheck_notrace+0x0/0xe
  [<c012331a>] do_group_exit+0x5c/0x85
  [<c0123350>] sys_exit_group+0xd/0x10
  [<c01037f6>] syscall_call+0x7/0xb
  [<ffffffff>] 0xffffffff
irq event stamp: 369633930
hardirqs last  enabled at (369633930): [<c02ca650>]
_spin_unlock_irqrestore+0x34/0x39
hardirqs last disabled at (369633929): [<c02ca595>]
_spin_lock_irqsave+0xc/0x31
softirqs last  enabled at (369633898): [<c01245e4>] do_softirq+0x37/0x4d
softirqs last disabled at (369633911): [<c01245e4>] do_softirq+0x37/0x4d

other info that might help us debug this:
1 lock held by swapper/0:
 #0:  (slock-AF_AX25){-+..}, at: [<f859dbfb>]
ax25_std_heartbeat_expiry+0x16/0xbb [ax25]

stack backtrace:
Pid: 0, comm: swapper Not tainted 2.6.28.5-dg8ngn #1
Call Trace:
 [<c01381f4>] print_usage_bug+0x13c/0x145
 [<c0138cb9>] mark_lock+0x33e/0x7bc
 [<c013a6d6>] __lock_acquire+0x469/0x65e
 [<c013a914>] lock_acquire+0x49/0x61
 [<f859ed33>] ax25_destroy_socket+0xb6/0x1c4 [ax25]
 [<c02ca3d2>] _write_lock_bh+0x1e/0x29
 [<f859ed33>] ax25_destroy_socket+0xb6/0x1c4 [ax25]
 [<f859ed33>] ax25_destroy_socket+0xb6/0x1c4 [ax25]
 [<f859e2ee>] ax25_heartbeat_expiry+0x0/0x29 [ax25]
 [<f859dc30>] ax25_std_heartbeat_expiry+0x4b/0xbb [ax25]
 [<c01278ca>] run_timer_softirq+0xf6/0x14b
 [<c01244ff>] __do_softirq+0x82/0x130
 [<c01245e4>] do_softirq+0x37/0x4d
 [<c010f8f9>] smp_apic_timer_interrupt+0x6e/0x78
 [<c0104455>] apic_timer_interrupt+0x2d/0x34
 [<c0108e76>] default_idle+0x2f/0x4c
 [<c0102561>] cpu_idle+0x63/0x77

Greetings,
Jann
DG8NGN


--
Jann Traschewski, Drosselstr.1, D-90513 Zirndorf, Germany
Tel.: +49-911-696971, Mobile: +49-170-1045937, E-Mail: jann@....de
Ham: DG8NGN / DB0VOX, http://www.qsl.net/dg8ngn, ICQ UIN: 4130182 
 

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