Re: [rfcomm_run] WARNING: CPU: 0 PID: 95 at kernel/sched/core.c:7312 __might_sleep()

From: Richard Guy Briggs
Date: Mon Oct 27 2014 - 13:34:54 EST


On 14/10/27, Fengguang Wu wrote:
> On Mon, Oct 27, 2014 at 02:36:27PM +0100, Peter Zijlstra wrote:
> > On Mon, Oct 27, 2014 at 09:06:21PM +0800, Fengguang Wu wrote:
> > > Hi Peter,
> > >
> > > FYI, this bug seems still there on v3.18-rc2.
> >
> > Oh, right, I commented out that patch and the audit one because I was
> > waiting for some feedback. Lemme go prod people.
>
> audit? I do hit an kauditd_thread warning recently:
>
> [ 89.102903] ------------[ cut here ]------------
> [ 89.107650] WARNING: CPU: 6 PID: 3175 at /kbuild/src/lkp/kernel/sched/core.c:7310 __might_sleep+0x8e/0xc0()
> [ 89.117606] do not call blocking ops when !TASK_RUNNING; state=1 set at [<ffffffff811088f8>] kauditd_thread+0x168/0x220
> [ 89.128588] Modules linked in: btrfs raid456 async_raid6_recov async_memcpy async_pq async_xor xor async_tx raid6_pq ipmi_watchdog ipmi_msghandler ses enclosure sg s
> d_mod ata_generic pata_acpi floppy parport_pc parport snd_pcm snd_timer snd ata_piix soundcore i2c_i801 serio_raw mptsas libata pcspkr i5400_edac shpchp mptscsih edac_core mptbase i5k_amb tpm_infineon scsi_transport_sas [ 89.165503] CPU: 6 PID: 3175 Comm: kauditd Tainted: G W 3.18.0-rc2-g8696cce #1
> [ 89.173988] Hardware name: Supermicro X7DW3/X7DWN, BIOS 6.00 09/28/2007
> [ 89.180735] 0000000000000009 ffff880229d8bd78 ffffffff81876101 ffff88022fd90478
> [ 89.188596] ffff880229d8bdc8 ffff880229d8bdb8 ffffffff8106a421 ffff880229d8bda8
> [ 89.196483] ffffffff81b345f0 0000000000000038 0000000000000000 ffff8800bd0fd850
> [ 89.204364] Call Trace:
> [ 89.206945] [<ffffffff81876101>] dump_stack+0x4e/0x68
> [ 89.212209] [<ffffffff8106a421>] warn_slowpath_common+0x81/0xa0
> [ 89.218362] [<ffffffff8106a486>] warn_slowpath_fmt+0x46/0x50
> [ 89.224257] [<ffffffff811088f8>] ? kauditd_thread+0x168/0x220
> [ 89.230216] [<ffffffff811088f8>] ? kauditd_thread+0x168/0x220
> [ 89.236201] [<ffffffff8109039e>] __might_sleep+0x8e/0xc0
> [ 89.241746] [<ffffffff8110897b>] kauditd_thread+0x1eb/0x220
> [ 89.247536] [<ffffffff81098030>] ? wake_up_state+0x20/0x20
> [ 89.253247] [<ffffffff81108790>] ? audit_printk_skb+0x70/0x70
> [ 89.259237] [<ffffffff81089e8f>] kthread+0xef/0x110
> [ 89.264330] [<ffffffff81089da0>] ? kthread_create_on_node+0x180/0x180
> [ 89.271010] [<ffffffff8187eabc>] ret_from_fork+0x7c/0xb0
> [ 89.276543] [<ffffffff81089da0>] ? kthread_create_on_node+0x180/0x180
> [ 89.283205] ---[ end trace 4692477bd4539c42 ]---
>
> However I'm not sure if it's a bug in 3.18-rc2, or one of the
> following trees introduced that warning.

My guess is that none of the trees below would likely have caused this
except maybe top/locking/urgent (and obviously the peterz-queue ones),
and even then, I'd look in the v3.18-rc2 code first. I'll have a look
in the audit code to see if anything jumps out at me. There have been
wait issues in audit recently and may not be entirely cleaned up.

> amirv/driver_updates
> arm-platforms/irq/irqchip_state
> arm-platforms/irq/priority_drop
> asoc/for-linus
> asoc/for-next
> asoc/topic/sgtl5000
> bluetooth/master
> chanwoo-extcon/extcon-next
> drm-intel/drm-intel-next-queued
> drm-intel/drm-intel-nightly
> hwmon/poweroff-handler
> ipsec-next/master
> ipsec-next/testing
> jiangliu/ioapic/hotplug_v7
> kees/lsm/modpin.old
> kvm/queue
> m68k/for-3.19
> m68k/for-linus
> m68k/for-next
> m68k/m68k-queue
> mips-john/mips-for-linux-next
> net/master
> net-next/master
> peterz-queue/locking/urgent
> peterz-queue/perf/core
> peterz-queue/perf/urgent
> peterz-queue/sched/urgent
> peterz-queue/sched/wait
> peterz-queue/timers/urgent
> regulator/for-next
> renesas/cleanup-for-v3.19
> renesas/devel
> renesas/dt-clocksource-for-v3.19
> renesas/dt-du-for-v3.19
> renesas/dt-for-v3.19
> renesas/next
> renesas/soc-for-v3.19
> sound/for-linus
> spi/for-linus
> spi/for-next
> staging/staging-testing
> tip/locking/urgent
> usb/usb-linus
>
> Thanks,
> Fengguang

- RGB

--
Richard Guy Briggs <rbriggs@xxxxxxxxxx>
Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
Remote, Ottawa, Canada
Voice: +1.647.777.2635, Internal: (81) 32635, Alt: +1.613.693.0684x3545
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