Re: + delay-accounting-taskstats-interface-send-tgid-once.patch added to -mm tree

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



> CPU 0                		CPU 1
> (in irq)            	 	(in the code above)

actually CPU 0 doesn't even have to be in irq context; any context will
do

> 		     		stats_lock is taken
> tasklist_lock is taken	     	
> stats_lock_is taken <spin>	
> 				<interrupt happens>
> 		     		tasklist_lock is taken
> 		     
> which now forms an AB-BA deadlock!
> 
> 
> this happens at least in copy_process which can call taskstats_tgid_free
> without first disabling interrupts (via cleanup_signal). There may be
> many other cases, I've not checked deeper yet.
> 
> Solution should be to make these functions use irqsave variant... any
> comments from the authors of this patch ?
> 
> 
> -
> 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/

-
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/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux