18-rc3+: ODEBUG: assert_init not available (active state 0) object type: timer_list hint: stub_timer

From: Borislav Petkov
Date: Tue Nov 04 2014 - 16:43:41 EST


Hi,

I see the following splat on rc3+ of today when doing a suspend/resume
cycle. My suspend script does

echo 3 > /proc/sys/vm/drop_caches

and this maybe is related, judging by the code the splat points to:
page-writeback.c

>From looking at this a bit, there's some already freed timer we're
touching in laptop_sync_completion(), probably already freed in
blk_cleanup_queue(). Hmm...

[ 106.615059] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 113.317145] ------------[ cut here ]------------
[ 113.319022] WARNING: CPU: 1 PID: 4006 at lib/debugobjects.c:263 debug_print_object+0x8b/0xa0()
[ 113.320970] ODEBUG: assert_init not available (active state 0) object type: timer_list hint: stub_timer+0x0/
0x20
[ 113.322866] Modules linked in: cpufreq_stats cpufreq_conservative cpufreq_powersave cpufreq_userspace binfmt
_misc uinput ipv6 vfat fat snd_hda_codec_conexant snd_hda_codec_generic snd_hda_codec_hdmi arc4 rtl8192ce rtl_p
ci rtl8192c_common rtlwifi pcspkr evdev mac80211 k10temp cfg80211 snd_hda_intel snd_hda_controller snd_hda_code
c snd_hwdep thinkpad_acpi nvram snd_pcm snd_seq snd_seq_device snd_timer radeon snd video soundcore battery drm
_kms_helper ac ttm button rtsx_pci_sdmmc mmc_core rtsx_pci mfd_core ehci_pci ohci_pci ohci_hcd ehci_hcd thermal
[ 113.327292] CPU: 1 PID: 4006 Comm: sync Not tainted 3.18.0-rc3+ #1
[ 113.327294] Hardware name: LENOVO 30515QG/30515QG, BIOS 8RET30WW (1.12 ) 09/15/2011
[ 113.327297] 0000000000000009 ffff8800ba2f3d98 ffffffff8155dbc4 ffffffff810b3d56
[ 113.327303] ffff8800ba2f3de8 ffff8800ba2f3dd8 ffffffff810721ac ffff8800ba2f3e08
[ 113.327308] ffff8800ba2f3e88 ffffffff81a3bf60 ffffffff817fb9e5 ffffffff82b46508
[ 113.327314] Call Trace:
[ 113.327317] [<ffffffff8155dbc4>] dump_stack+0x4f/0x7c
[ 113.327326] [<ffffffff810b3d56>] ? down_trylock+0x36/0x50
[ 113.327331] [<ffffffff810721ac>] warn_slowpath_common+0x8c/0xc0
[ 113.327337] [<ffffffff81072226>] warn_slowpath_fmt+0x46/0x50
[ 113.327341] [<ffffffff810d8b3c>] ? do_init_timer+0x5c/0x60
[ 113.327345] [<ffffffff812b992b>] debug_print_object+0x8b/0xa0
[ 113.327349] [<ffffffff810d8aa0>] ? ftrace_raw_event_tick_stop+0xe0/0xe0
[ 113.327353] [<ffffffff812ba621>] debug_object_assert_init+0x101/0x140
[ 113.327358] [<ffffffff811529d5>] ? laptop_sync_completion+0x5/0xa0
[ 113.327364] [<ffffffff810d9a4f>] del_timer+0x1f/0x70
[ 113.327367] [<ffffffff81152a2c>] laptop_sync_completion+0x5c/0xa0
[ 113.327371] [<ffffffff811529d5>] ? laptop_sync_completion+0x5/0xa0
[ 113.327375] [<ffffffff811d82d5>] sys_sync+0x85/0x90
[ 113.327379] [<ffffffff815672d2>] system_call_fastpath+0x12/0x17
[ 113.327386] ---[ end trace 97d71e72cfb411a7 ]---
[ 113.576302] hib.sh (4003): drop_caches: 3
[ 115.126304] PM: Syncing filesystems ... done.

--
Regards/Gruss,
Boris.

Sent from a fat crate under my desk. Formatting is fine.
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