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X-ASG-Orig-Subj: Re: BUG: warning at kernel/mutex.c:281 for 2.6.16.-git8 thru git20
Subject: Re: BUG: warning at kernel/mutex.c:281 for 2.6.16.-git8 thru git20
From: Arjan van de Ven <arjan@infradead.org>
To: Donald Parsons <dparsons@brightdsl.net>
Cc: linux-kernel@vger.kernel.org
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Date: Sun, 02 Apr 2006 19:05:08 +0200
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> LID SLPB UART EXP0 EXP1 EXP2 EXP3 PCI1 USB0 USB1 USB3 USB7 AC9M
> ACPI: (supports S0 S3 S4 S5)
> Freeing unused kernel memory: 160k freed
> BUG: warning at kernel/mutex.c:281/__mutex_trylock_slowpath()
> <7812af12> mutex_trylock+0x70/0x152   <7823370e> hdaps_mousedev_poll\
>    +0xd/0xc5
> <781205fa> run_timer_softirq+0x11f/0x159   <78233701>
>    hdaps_mousedev_poll+0x0/0xc5
> <7811d22c> __do_softirq+0x40/0x88   <781049af> do_softirq+0x44/0x4c
> =======================
> <7811d314> irq_exit+0x2d/0x37   <781048d1> do_IRQ+0x79/0x83
> <781035ae> common_interrupt+0x1a/0x20   <7811680e> __might_sleep\
>    +0x16/0x94
> <7819e794> copy_to_user+0x18/0x5d   <7815c9be> filldir64+0x94/0xc3
> <7817c08f> sysfs_readdir+0x17d/0x1c2   <7815c92a> filldir64+0x0/0xc3
> <7815c92a> filldir64+0x0/0xc3   <7815c6ef> vfs_readdir+0x63/0x89
> <7815ca53> sys_getdents64+0x66/0xb3   <78296f41> _spin_unlock+0xf/0x23
> <7815be56> do_fcntl+0xc3/0x136   <78102be3> syscall_call+0x7/0xb
> SCSI subsystem initialized
> libata version 1.20 loaded.
> ata_piix 0000:00:1f.2: version 1.05
> ata_piix 0000:00:1f.2: MAP [ P0 P2 IDE IDE ]
> ata: 0x170 IDE port busy
> .....
> 

this is a bug in the hdaps mutex conversion; mutex code isn't allowed to
run in IRQ context, not even the trylock.