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Date: Wed, 14 Oct 2009 22:12:45 +0900 From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> To: catalin.marinas@....com Cc: paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org Subject: Re: [2.6.32-rc3 kmemleak] WARNING:atkernel/lockdep.c:3161check_flags+0xbe/0x180() Catalin Marinas wrote: > Until I manage to reproduce the problem, could you please try the patch > below: > > diff --git a/mm/slab.c b/mm/slab.c > index 7dfa481..f8f671b 100644 > --- a/mm/slab.c > +++ b/mm/slab.c > @@ -2263,7 +2263,8 @@ kmem_cache_create (const char *name, size_t size, size_t align, > * (bootstrapping cannot cope with offslab caches so don't do > * it too early on.) > */ > - if ((size >= (PAGE_SIZE >> 3)) && !slab_early_init) > + if ((size >= (PAGE_SIZE >> 3)) && !slab_early_init && > + !(cachep->flags & SLAB_NOLEAKTRACE)) > /* > * Size is large, assume best to place the slab management obj > * off-slab (should allow better packing of objs). It is "&& !(flags & SLAB_NOLEAKTRACE)" rather than "&& !(cachep->flags & SLAB_NOLEAKTRACE)" because "cachep->flags = flags;" is not yet done, isn't it? After adding "&& !(flags & SLAB_NOLEAKTRACE)", I got out of memory error later. [ 0.000000] Linux version 2.6.32-rc4 (root@...oyo) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-44)) #9 SMP Wed Oct 14 20:44:56 JST 2009 (...snipped...) [ 0.000000] ------------------------------------------------------- [ 0.000000] Good, all 218 testcases passed! | [ 0.000000] --------------------------------- [ 0.000000] ODEBUG: selftest passed [ 0.000000] TSC freq read from hypervisor : 2327.550 MHz [ 0.000000] Detected 2327.550 MHz processor. [ 0.008398] Calibrating delay loop (skipped), value calculated using timer frequency.. 4655.10 BogoMIPS (lpj=9310200) [ 0.022680] Mount-cache hash table entries: 512 (...snipped...) [ 7.578789] Initializing USB Mass Storage driver... [ 7.582655] usbcore: registered new interface driver usb-storage [ 7.584314] USB Mass Storage support registered. [ 7.590848] PNP: No PS/2 controller found. Probing ports directly. [ 8.295096] serio: i8042 KBD port at 0x60,0x64 irq 1 [ 8.297408] serio: i8042 AUX port at 0x60,0x64 irq 12 [ 8.312965] mice: PS/2 mouse device common for all mice [ 8.925040] Kernel panic - not syncing: Out of memory and no killable processes... [ 8.925045] [ 8.927806] Pid: 139, comm: kseriod Not tainted 2.6.32-rc4 #9 [ 8.930156] Call Trace: [ 8.930297] EISA: Probing bus 0 at eisa.0 [ 8.934031] [<c103bb1b>] panic+0x4b/0x110 [ 8.935244] [<c109dacf>] __out_of_memory+0x12f/0x130 [ 8.936652] [<c109db27>] out_of_memory+0x57/0xb0 [ 8.937936] [<c10a0730>] __alloc_pages_nodemask+0x5c0/0x600 [ 8.938986] TCP cubic registered [ 8.939130] NET: Registered protocol family 17 [ 8.940733] Using IPI No-Shortcut mode [ 8.944585] [<c10c29a0>] cache_alloc_refill+0x340/0x700 [ 8.946047] [<c10c24ff>] ? kmem_cache_alloc+0x5f/0x1c0 [ 8.948022] [<c10c2614>] kmem_cache_alloc+0x174/0x1c0 [ 8.949979] [<c10c71a9>] ? create_object+0x29/0x240 [ 8.951447] [<c10676b5>] ? mark_held_locks+0x55/0x70 [ 8.953261] [<c10c71a9>] create_object+0x29/0x240 [ 8.955636] [<c10c1b29>] ? poison_obj+0x29/0x50 [ 8.957248] [<c10c1686>] ? dbg_redzone1+0x16/0x30 [ 8.958518] [<c13076ba>] kmemleak_alloc+0x6a/0xe0 [ 8.959827] [<c1067954>] ? trace_hardirqs_on_caller+0x104/0x170 [ 8.961639] [<c10c3e50>] __kmalloc+0x1c0/0x230 [ 8.962890] [<c1191200>] ? kobject_get_path+0x50/0xe0 [ 8.964308] [<c1191200>] kobject_get_path+0x50/0xe0 [ 8.966717] [<c10676b5>] ? mark_held_locks+0x55/0x70 [ 8.968160] [<c1191a2d>] kobject_uevent_env+0x2dd/0x670 [ 8.969670] [<c1067954>] ? trace_hardirqs_on_caller+0x104/0x170 [ 8.971271] [<c10679cb>] ? trace_hardirqs_on+0xb/0x10 [ 8.972644] [<c11ed38c>] ? device_pm_add+0x7c/0x130 [ 8.973959] [<c1191dca>] kobject_uevent+0xa/0x10 [ 8.975240] [<c11e5dd2>] device_add+0x3a2/0x5c0 [ 8.977549] [<c1199118>] ? kvasprintf+0x48/0x60 [ 8.978781] [<c1190fba>] ? kobject_set_name_vargs+0x4a/0x60 [ 8.980303] [<c1264348>] input_register_device+0x88/0x1f0 [ 8.982355] [<c126871b>] atkbd_connect+0x21b/0x280 [ 8.983681] [<c131a59a>] ? mutex_lock_nested+0x3a/0x50 [ 8.985875] [<c125f5a0>] serio_connect_driver+0x30/0x50 [ 8.988324] [<c125f5d8>] serio_driver_probe+0x18/0x20 [ 8.990308] [<c11e8a90>] driver_probe_device+0xa0/0x290 [ 8.991910] [<c11e8eea>] __driver_attach+0x7a/0x80 [ 8.993823] [<c11e7ef9>] bus_for_each_dev+0x49/0x70 [ 8.995192] [<c11e889e>] driver_attach+0x1e/0x20 [ 8.998043] [<c11e8e70>] ? __driver_attach+0x0/0x80 [ 8.999406] [<c1260363>] serio_thread+0x2b3/0x320 [ 9.001158] [<c1054e20>] ? autoremove_wake_function+0x0/0x50 [ 9.002699] [<c12600b0>] ? serio_thread+0x0/0x320 [ 9.004027] [<c1054bb4>] kthread+0x74/0x80 [ 9.005492] [<c1054b40>] ? kthread+0x0/0x80 [ 9.006651] [<c1003897>] kernel_thread_helper+0x7/0x10 > I don't think we should add SLAB_NOLEAKTRACE to slabmgmt since in theory > it should work. Is there a slabmgmt allocated for each > kmem_cache_alloc()? If yes, it will indeed get into infinite recursive > calls. If not, kmemleak should be able to cope though in some situations > it may still overflow. Will you tell me how to check it? (Some /proc file?) Regards. -- 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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