On (08/04/11 17:05), Peter Zijlstra wrote: > On Thu, 2011-08-04 at 17:13 +0300, Sergey Senozhatsky wrote: > > Hello, > > Got the following trace on 3.0-git19 (07865-g1280ea8): > > > > [ 132.794685] WARNING: at kernel/lockdep.c:3117 match_held_lock+0xf6/0x12e() > > [ 132.794687] Hardware name: Aspire 5741G > > [ 132.794689] Modules linked in: kvm_intel kvm tun ipv6 microcode snd_hda_codec_hdmi snd_hda_codec_realtek broadcom snd_hda_intel snd_hda_codec tg3 snd_pcm snd_timer snd soundcore acer_wmi evdev libphy sparse_keymap psmouse snd_page_alloc > > pcspkr battery ac wmi button ehci_hcd sr_mod cdrom usbcore sd_mod ahci > > [ 132.794731] Pid: 4029, comm: qemu-system-x86 Not tainted 3.1.0-dbg-07865-g1280ea8-dirty #668 > > [ 132.794733] Call Trace: > > [ 132.794736] <IRQ> [<ffffffff8103e4e0>] warn_slowpath_common+0x7e/0x96 > > [ 132.794744] [<ffffffff8103e50d>] warn_slowpath_null+0x15/0x17 > > [ 132.794748] [<ffffffff8106dcee>] match_held_lock+0xf6/0x12e > > [ 132.794751] [<ffffffff8106dd88>] lock_is_held+0x62/0xa6 > > [ 132.794757] [<ffffffff81086471>] cgroup_lock_is_held+0x10/0x12 > > [ 132.794762] [<ffffffff810368a2>] set_task_cpu+0x1ac/0x3e3 > > [ 132.794766] [<ffffffff8103856a>] ? select_task_rq_fair+0x5c0/0x9ca > > [ 132.794769] [<ffffffff8103748d>] ? try_to_wake_up+0x29/0x28b > > [ 132.794773] [<ffffffff8103748d>] ? try_to_wake_up+0x29/0x28b > > [ 132.794779] [<ffffffff812552a5>] ? do_raw_spin_lock+0x6b/0x122 > > [ 132.794783] [<ffffffff81037603>] try_to_wake_up+0x19f/0x28b > > [ 132.794787] [<ffffffff810603ed>] ? update_rmtp+0x65/0x65 > > [ 132.794790] [<ffffffff8103770e>] wake_up_process+0x10/0x12 > > [ 132.794794] [<ffffffff8106040a>] hrtimer_wakeup+0x1d/0x21 > > [ 132.794797] [<ffffffff81060816>] __run_hrtimer+0x1b1/0x372 > > [ 132.794800] [<ffffffff810613a2>] hrtimer_interrupt+0xe6/0x1b0 > > [ 132.794805] [<ffffffff810185d5>] smp_apic_timer_interrupt+0x80/0x93 > > [ 132.794810] [<ffffffff81493af3>] apic_timer_interrupt+0x73/0x80 > > [ 132.794812] <EOI> [<ffffffff810fb998>] ? do_mmu_notifier_register+0x66/0x125 > > [ 132.794822] [<ffffffff810ec132>] ? mm_take_all_locks+0x10b/0x165 > > [ 132.794826] [<ffffffff810ec160>] ? mm_take_all_locks+0x139/0x165 > > [ 132.794829] [<ffffffff810ec132>] ? mm_take_all_locks+0x10b/0x165 > > [ 132.794832] [<ffffffff810fb9a0>] do_mmu_notifier_register+0x6e/0x125 > > [ 132.794836] [<ffffffff810fba72>] mmu_notifier_register+0xe/0x10 > > [ 132.794852] [<ffffffffa01fcc0d>] kvm_dev_ioctl+0x297/0x400 [kvm] > > [ 132.794857] [<ffffffff81119022>] do_vfs_ioctl+0x46c/0x4ad > > [ 132.794862] [<ffffffff8110a68d>] ? fget_light+0xed/0x2a7 > > [ 132.794867] [<ffffffff81492fca>] ? sysret_check+0x2e/0x69 > > [ 132.794871] [<ffffffff811190b4>] sys_ioctl+0x51/0x75 > > [ 132.794875] [<ffffffff81492f92>] system_call_fastpath+0x16/0x1b > > [ 132.794877] ---[ end trace 298584c4014cd2b8 ]--- > > Curious, how easy is that to reproduce? That really shouldn't happen and > its not immediately obvious how it could happen. > Hello Peter, Frankly, not very easy. I'm using qemu quite heavy last days and got only one trace so far. Sergey -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>