linux-kernel - Bug in 3.15-rc1: Scheduling while atomic splats filling log

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Message-ID: <53502886.6020107@lwfinger.net>
Date:	Thu, 17 Apr 2014 14:16:22 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	Larry Finger <Larry.Finger@...inger.net>
Subject: Bug in 3.15-rc1: Scheduling while atomic splats filling log

On kernel 3.15-rc1, I get log entries for scheduling while atomic. These BUG 
splats are repeated many times, and start early in the boot. I tried to bisect 
this problem, but the bug does not always show on every boot, and I must have 
had a faulty kernel boot without error. In any case, I ended up at a merge pull. 
What I can definitively report is that a kernel generated from commit fd1df00 is 
bad.

Fortunately, I have retained the kernels from the bisection onward, and I will 
retry them to see if I reported any of them incorrectly. As far as I know, the 
configuration was unchanged during the bisection.

The logged messages are as follows:

2014-04-16T10:51:25.205576-05:00 larrylap systemd[1]: Starting Name Service 
Cache Daemon...
2014-04-16T10:51:25.197425-05:00 larrylap kernel: [   27.176133] Call Trace:
2014-04-16T10:51:25.205599-05:00 larrylap kernel: [   27.176139] 
[<ffffffff81607386>] dump_stack+0x4e/0x71
2014-04-16T10:51:25.205605-05:00 larrylap kernel: [   27.176144] 
[<ffffffff816009e2>] __schedule_bug+0x5d/0x6d
2014-04-16T10:51:25.205615-05:00 larrylap kernel: [   27.176149] 
[<ffffffff8160a8d5>] __schedule+0x775/0x810
2014-04-16T10:51:25.205618-05:00 larrylap kernel: [   27.176154] 
[<ffffffff8160aa34>] schedule+0x24/0x70
2014-04-16T10:51:25.205620-05:00 larrylap kernel: [   27.176159] 
[<ffffffff8160adc1>] schedule_preempt_disabled+0x11/0x20
2014-04-16T10:51:25.205623-05:00 larrylap kernel: [   27.176164] 
[<ffffffff810941a3>] cpu_startup_entry+0x123/0x430
2014-04-16T10:51:25.205625-05:00 larrylap kernel: [   27.176170] 
[<ffffffff8102dcb3>] start_secondary+0x1d3/0x290
2014-04-16T10:51:25.205627-05:00 larrylap kernel: [   27.176175] 
[<ffffffff813aa118>] ? acpi_ps_parse_aml+0x186/0x476
2014-04-16T10:51:25.205629-05:00 larrylap kernel: [   27.177033] BUG: scheduling 
while atomic: swapper/1/0/0x00000004
2014-04-16T10:51:25.205638-05:00 larrylap kernel: [   27.177037] no locks held 
by swapper/1/0.
2014-04-16T10:51:25.205641-05:00 larrylap kernel: [   27.177039] Modules linked 
in: arc4 b43 mac80211 cfg80211 snd_hda_codec_generic snd_hda_intel snd_hda_co
ntroller snd_hda_codec snd_hwdep snd_pcm snd_seq powernow_k8 kvm_amd kvm rfkill 
bcma snd_timer snd_seq_device snd r852 pcspkr ssb serio_raw sdhci_pci sm_comm
on sdhci nand forcedeth mmc_core sg mtd r592 nand_ids nand_bch memstick bch 
nand_ecc sr_mod cdrom soundcore battery ac autofs4 nouveau ttm drm_kms_helper drm
  i2c_algo_bit i2c_core thermal wmi video processor button thermal_sys hwmon 
ata_generic pata_amd

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