crash in 'wake_up_interruptible()' on SMP
Can some one explain why I see the below crash on Intel Xeon SMP box. The kernel version is 2.6.11. This is what I'm trying to do in the driver. 1.Submit a request to a device in 'unlocked_ioctl()' and issue 'wait_event_interruptible_timeout()' for 10 jiffies. There can be many such outstanding requests issued by different processes and all these are placed in a queue. 2.The 'wake_up_interruptible()' is issued either from tasklet or a poll-thread which polls on the status of the request. 3. The request queue is protected using 'spin_lock_bh/spin_unlock_bh' to be softIRQ safe. I'm stating this to point that 'spin_lock_irqsave/spin_lock_irqrestore' is issued only within waitQ. If i either not use 'unlocked_ioctl()' i.e. use ioctl() (or)comment out 'wake_up_interruptible()' call I don't see the crash. Is wake_up_interruptible SMP safe??? Regards, kiran /-/ [EMAIL PROTECTED] ~]# [ cut here ] kernel BUG at include/asm/spinlock.h:112! invalid operand: [#1] SMP Modules linked in: pkp_drv(U) md5 ipv6 parport_pc lp parport autofs4 rfcomm l2cap bluetooth sunrpc dm_mod video button battery ac uhci_hcd hw_random i2c_i801 i2c_core shpchp e1000 e100 mii floppy sata_sil libata scsi_mod ext3 jbd CPU:0 EIP:0060:[]Tainted: P VLI EFLAGS: 00210002 (2.6.11-1.1369_FC4smp) EIP is at _spin_unlock_irqrestore+0x26/0x30 eax: 0001 ebx: cfefb810 ecx: cfefb810 edx: 00200292 esi: edi: e0af0f20 ebp: esp: c8ae2e10 ds: 007b es: 007b ss: 0068 Process swamp (pid: 5920, threadinfo=c8ae2000 task=c79d4a80) Stack: badc0ded e0c8e1af e0af0268 e0a86ef8 e0c87f46 0802 00200286 e0a86ef8 00200286 e0c9c580 e0c87dd1 cfec1810 d028a810 bf9fc228 e0c8dab4 0001 c8ae2000 3f37331a bf9fc228 e0c9c580 /--/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
crash in 'wake_up_interruptible()' on SMP
Can some one explain why I see the below crash on Intel Xeon SMP box. The kernel version is 2.6.11. This is what I'm trying to do in the driver. 1.Submit a request to a device in 'unlocked_ioctl()' and issue 'wait_event_interruptible_timeout()' for 10 jiffies. There can be many such outstanding requests issued by different processes and all these are placed in a queue. 2.The 'wake_up_interruptible()' is issued either from tasklet or a poll-thread which polls on the status of the request. 3. The request queue is protected using 'spin_lock_bh/spin_unlock_bh' to be softIRQ safe. I'm stating this to point that 'spin_lock_irqsave/spin_lock_irqrestore' is issued only within waitQ. If i either not use 'unlocked_ioctl()' i.e. use ioctl() (or)comment out 'wake_up_interruptible()' call I don't see the crash. Is wake_up_interruptible SMP safe??? Regards, kiran /-/ [EMAIL PROTECTED] ~]# [ cut here ] kernel BUG at include/asm/spinlock.h:112! invalid operand: [#1] SMP Modules linked in: pkp_drv(U) md5 ipv6 parport_pc lp parport autofs4 rfcomm l2cap bluetooth sunrpc dm_mod video button battery ac uhci_hcd hw_random i2c_i801 i2c_core shpchp e1000 e100 mii floppy sata_sil libata scsi_mod ext3 jbd CPU:0 EIP:0060:[c03087b0]Tainted: P VLI EFLAGS: 00210002 (2.6.11-1.1369_FC4smp) EIP is at _spin_unlock_irqrestore+0x26/0x30 eax: 0001 ebx: cfefb810 ecx: cfefb810 edx: 00200292 esi: edi: e0af0f20 ebp: esp: c8ae2e10 ds: 007b es: 007b ss: 0068 Process swamp (pid: 5920, threadinfo=c8ae2000 task=c79d4a80) Stack: badc0ded e0c8e1af e0af0268 e0a86ef8 e0c87f46 0802 00200286 e0a86ef8 00200286 e0c9c580 e0c87dd1 cfec1810 d028a810 bf9fc228 e0c8dab4 0001 c8ae2000 3f37331a bf9fc228 e0c9c580 /--/ - To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
