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Date: Mon, 6 Jul 2015 12:04:47 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Arthur Marsh <arthur.marsh@...ernode.on.net> Cc: linux-kernel@...r.kernel.org, Rusty Russell <rusty@...tcorp.com.au>, Steven Rostedt <rostedt@...dmis.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Oleg Nesterov <oleg@...hat.com>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Subject: Re: lock-up with module: Optimize __module_address() using a latched RB-tree On Mon, Jul 06, 2015 at 04:03:45AM +0930, Arthur Marsh wrote: > On this machine, a single core Athlon 64 with a 32 bit current Linus' git > head kernel, I get a lock-up early in the boot process. (A dmesg output of a > successful boot-up of kernel 4.1.0 up to and slightly passed the point where > the git head kernel locks up is attached). > > A photo of the lock-up appears at: > > http://www.users.on.net/~arthur.marsh/20150706462.jpg So building a kernel with your .config (and a similar GCC) I was able to match up the Code: with actual compiler output. The faulting instruction is a dereference of mod->module_core through: __modules_address() mod_find() latch_tree_find() mod_tree_comp() __mod_tree_val() 20e0: 8b 90 44 01 00 00 mov 0x144(%eax),%edx Now eax is NULL, which will have given you the splat. The curious thing is that the mod pointer is obtained from the mod_tree_node structure: 20d0: 8b 46 fc mov -0x4(%esi),%eax And esi looks like a regular kernel pointer. Furthermore, we explicitly set the mod pointers in mod_tree_insert() before linking in the nodes. This all has the smell of memory corruption, this gfx card you need to pull, you're not accidentally using a binary driver for that? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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