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Date: Sun, 22 Jul 2007 14:42:24 +0200
From: Ingo Molnar <mingo@elte.hu>
To: linux-kernel@vger.kernel.org
Cc: Wim Van Sebroeck <wim@iguana.be>
Subject: [bug] pcwd_init_module(): WARNING: at lib/kref.c:33 kref_get()
Message-ID: <20070722124224.GA20382@elte.hu>
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enabling CONFIG_PCWATCHDOG=y crashes bzImage bootup, see below. Tested 
on latest -git.

	Ingo

------------------->
Calling initcall 0xc1e81f8c: pcwd_init_module+0x0/0x14()
WARNING: at lib/kref.c:33 kref_get()
 [<c0105f6e>] show_trace_log_lvl+0x19/0x2e
 [<c0106067>] show_trace+0x12/0x14
 [<c010607d>] dump_stack+0x14/0x16
 [<c051aa54>] kref_get+0x37/0x40
 [<c0519dfe>] kobject_get+0x12/0x17
 [<c06fd12a>] get_bus+0x11/0x21
 [<c06fd729>] bus_add_driver+0x18/0x16b
 [<c06fe45a>] driver_register+0x66/0x6b
 [<c0702575>] isa_register_driver+0x27/0x126
 [<c1e81f9e>] pcwd_init_module+0x12/0x14
 [<c1e50838>] kernel_init+0x15a/0x2df
 [<c0105d87>] kernel_thread_helper+0x7/0x10
 =======================
WARNING: at lib/kref.c:33 kref_get()
 [<c0105f6e>] show_trace_log_lvl+0x19/0x2e
 [<c0106067>] show_trace+0x12/0x14
 [<c010607d>] dump_stack+0x14/0x16
 [<c051aa54>] kref_get+0x37/0x40
 [<c0519dfe>] kobject_get+0x12/0x17
 [<c051a429>] kobject_init+0x32/0x43
 [<c051a4c3>] kobject_register+0x15/0x31
 [<c06fd76d>] bus_add_driver+0x5c/0x16b
 [<c06fe45a>] driver_register+0x66/0x6b
 [<c0702575>] isa_register_driver+0x27/0x126
 [<c1e81f9e>] pcwd_init_module+0x12/0x14
 [<c1e50838>] kernel_init+0x15a/0x2df
 [<c0105d87>] kernel_thread_helper+0x7/0x10
 =======================
BUG: spinlock bad magic on CPU#0, swapper/1
 lock: c1b6a888, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0
 [<c0105f6e>] show_trace_log_lvl+0x19/0x2e
 [<c0106067>] show_trace+0x12/0x14
 [<c010607d>] dump_stack+0x14/0x16
 [<c052b0be>] spin_bug+0xa1/0xa9
 [<c052b289>] _raw_spin_lock+0x1e/0x104
 [<c1385f7e>] _spin_lock+0x54/0x62
 [<c051a026>] kobject_shadow_add+0x84/0x171
 [<c051a11d>] kobject_add+0xa/0xc
 [<c051a4ca>] kobject_register+0x1c/0x31
 [<c06fd76d>] bus_add_driver+0x5c/0x16b
 [<c06fe45a>] driver_register+0x66/0x6b
 [<c0702575>] isa_register_driver+0x27/0x126
 [<c1e81f9e>] pcwd_init_module+0x12/0x14
 [<c1e50838>] kernel_init+0x15a/0x2df
 [<c0105d87>] kernel_thread_helper+0x7/0x10
 =======================