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    SubjectRe: [3.2+] BUG: scheduling while atomic: swapper/0/0/0x10000100
    On Thu, Jan 26, 2012 at 03:22:12PM +0100, Yves-Alexis Perez wrote:
    > Hi,
    >
    > I have an issue starting with 3.2 kernel on my Thinkpad x201s. I've
    > reported a bug on kernel bugzilla
    > (https://bugzilla.kernel.org/show_bug.cgi?id=42615) but I'm not too sure
    > anyone reads it so I'm re-reporting it here. It looks like the same bug
    > as https://bugs.launchpad.net/linux/+bug/917962.
    >
    > Basically everything is explained in both bugs, but here's a summary.
    > When I first upgraded to the 3.2 linux-image package (the system runs
    > Debian sid amd64), few seconds after the boot is complete I got the
    > following BUG():
    >
    > Jan 20 11:27:53 scapa kernel: [ 63.904544] BUG: scheduling while atomic: swapper/0/0/0x10000100
    > Jan 20 11:27:53 scapa kernel: [ 63.904550] Modules linked in: bnep rfcomm bluetooth deflate zlib_deflate ctr twofish_generic twofish_x86_64_3way twofish_x86_64 twofish_common camellia serpent blowfish_generic blowfish_x86_64 blowfish_common nf_conntrack_ipv6 nf_defrag_ipv6 cast5 ip6table_filter ip6_tables des_generic nf_conntrack_ipv4 cbc nf_defrag_ipv4 xt_state xcbc nf_conntrack rmd160 iptable_filter ip_tables x_tables sha512_generic sha256_generic sha1_ssse3 sha1_generic hmac crypto_null af_key ums_realtek usb_storage uas ext2 acpi_cpufreq mperf snd_hda_codec_hdmi snd_hda_codec_conexant arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss iwlwifi snd_pcm mac80211 snd_timer cfg80211 ehci_hcd thinkpad_acpi usbcore e1000e snd psmouse iTCO_wdt soundcore pcspkr rfkill i2c_i801 iTCO_vendor_support snd_page_alloc intel_ips serio_raw ac usb_common nvram battery tpm_tis power_supply tpm tpm_bios wmi evdev processor ext4 mbcache jbd2 crc16 xts gf128mul dm_crypt dm_mod aesni_intel cryptd aes_x86_64 aes
    > Jan 20 11:27:53 scapa kernel: _generic sd_mod crc_t10dif ahci libahci i915 thermal drm_kms_helper libata scsi_mod drm i2c_algo_bit button i2c_core video thermal_sys
    > Jan 20 11:27:53 scapa kernel: [ 63.904669] CPU 0
    > Jan 20 11:27:53 scapa kernel: [ 63.904671] Modules linked in: bnep rfcomm bluetooth deflate zlib_deflate ctr twofish_generic twofish_x86_64_3way twofish_x86_64 twofish_common camellia serpent blowfish_generic blowfish_x86_64 blowfish_common nf_conntrack_ipv6 nf_defrag_ipv6 cast5 ip6table_filter ip6_tables des_generic nf_conntrack_ipv4 cbc nf_defrag_ipv4 xt_state xcbc nf_conntrack rmd160 iptable_filter ip_tables x_tables sha512_generic sha256_generic sha1_ssse3 sha1_generic hmac crypto_null af_key ums_realtek usb_storage uas ext2 acpi_cpufreq mperf snd_hda_codec_hdmi snd_hda_codec_conexant arc4 snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss iwlwifi snd_pcm mac80211 snd_timer cfg80211 ehci_hcd thinkpad_acpi usbcore e1000e snd psmouse iTCO_wdt soundcore pcspkr rfkill i2c_i801 iTCO_vendor_support snd_page_alloc intel_ips serio_raw ac usb_common nvram battery tpm_tis power_supply tpm tpm_bios wmi evdev processor ext4 mbcache jbd2 crc16 xts gf128mul dm_crypt dm_mod aesni_intel cryptd aes_x86_64 aes
    > Jan 20 11:27:53 scapa kernel: _generic sd_mod crc_t10dif ahci libahci i915 thermal drm_kms_helper libata scsi_mod drm i2c_algo_bit button i2c_core video thermal_sys
    > Jan 20 11:27:53 scapa kernel: [ 63.904752]
    > Jan 20 11:27:53 scapa kernel: [ 63.904756] Pid: 0, comm: swapper/0 Not tainted 3.2.0-1-amd64 #1 LENOVO 51434JG/51434JG
    > Jan 20 11:27:53 scapa kernel: [ 63.904761] RIP: 0010:[<ffffffff811e36f5>] [<ffffffff811e36f5>] intel_idle+0xea/0x119
    > Jan 20 11:27:53 scapa kernel: [ 63.904773] RSP: 0018:ffffffff81601e88 EFLAGS: 00000202
    > Jan 20 11:27:53 scapa kernel: [ 63.904776] RAX: 0000000000000000 RBX: ffffffff81023b30 RCX: 0000000000007fda
    > Jan 20 11:27:53 scapa kernel: [ 63.904779] RDX: 0000000000007fda RSI: 0000000000000000 RDI: 00000000000003e8
    > Jan 20 11:27:53 scapa kernel: [ 63.904782] RBP: 0000000000000003 R08: 0000000000007fa9 R09: 0000000000007fa9
    > Jan 20 11:27:53 scapa kernel: [ 63.904785] R10: 0000000000001311 R11: ffffffff8160d020 R12: ffffffff81065de9
    > Jan 20 11:27:53 scapa kernel: [ 63.904788] R13: 000000000000003f R14: ffffffff810659e7 R15: ffffffff8101357e
    > Jan 20 11:27:53 scapa kernel: [ 63.904792] FS: 0000000000000000(0000) GS:ffff880137c00000(0000) knlGS:0000000000000000
    > Jan 20 11:27:53 scapa kernel: [ 63.904796] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
    > Jan 20 11:27:53 scapa kernel: [ 63.904799] CR2: 00007fc217631aa1 CR3: 0000000001605000 CR4: 00000000000006f0
    > Jan 20 11:27:53 scapa kernel: [ 63.904802] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    > Jan 20 11:27:53 scapa kernel: [ 63.904805] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    > Jan 20 11:27:53 scapa kernel: [ 63.904809] Process swapper/0 (pid: 0, threadinfo ffffffff81600000, task ffffffff8160d020)
    > Jan 20 11:27:53 scapa kernel: [ 63.904811] Stack:
    > Jan 20 11:27:53 scapa kernel: [ 63.904813] 0000000000000000 0000000000007fda 0000000000000000 0000000000000000
    > Jan 20 11:27:53 scapa kernel: [ 63.904819] 0000000000007fda 0000000001f2ae3a ffff880137c19970 ffffffff81645680
    > Jan 20 11:27:53 scapa kernel: [ 63.904824] 00000000fffffff0 0000000000000003 ffffffff81645778 ffffffff812633c3
    > Jan 20 11:27:53 scapa kernel: [ 63.904829] Call Trace:
    > Jan 20 11:27:53 scapa kernel: [ 63.904839] [<ffffffff812633c3>] ? cpuidle_idle_call+0xec/0x179
    > Jan 20 11:27:53 scapa kernel: [ 63.904846] [<ffffffff8100d255>] ? cpu_idle+0xa1/0xe8
    > Jan 20 11:27:53 scapa kernel: [ 63.904852] [<ffffffff816a9b3d>] ? start_kernel+0x3bd/0x3c8
    > Jan 20 11:27:53 scapa kernel: [ 63.904857] [<ffffffff816a9140>] ? early_idt_handlers+0x140/0x140
    > Jan 20 11:27:53 scapa kernel: [ 63.904861] [<ffffffff816a93c4>] ? x86_64_start_kernel+0x104/0x111
    > Jan 20 11:27:53 scapa kernel: [ 63.904864] Code: 29 f0 48 89 c7 e8 77 77 e6 ff 4c 69 e8 40 42 0f 00 48 89 04 24 48 89 54 24 08 48 89 44 24 18 48 89 54 24 20 49 01 d5 fb 66 66 90 <66> 66 90 85 1d ea 21 46 00 75 0f 48 8d 74 24 2c bf 05 00 00 00
    > Jan 20 11:27:53 scapa kernel: [ 63.904905] Call Trace:
    > Jan 20 11:27:53 scapa kernel: [ 63.904910] [<ffffffff812633c3>] ? cpuidle_idle_call+0xec/0x179
    > Jan 20 11:27:53 scapa kernel: [ 63.904914] [<ffffffff8100d255>] ? cpu_idle+0xa1/0xe8
    > Jan 20 11:27:53 scapa kernel: [ 63.904918] [<ffffffff816a9b3d>] ? start_kernel+0x3bd/0x3c8
    > Jan 20 11:27:53 scapa kernel: [ 63.904922] [<ffffffff816a9140>] ? early_idt_handlers+0x140/0x140
    > Jan 20 11:27:53 scapa kernel: [ 63.904926] [<ffffffff816a93c4>] ? x86_64_start_kernel+0x104/0x111
    >
    > I successfully reproduced using vanilla kernel, so I started bisecting.
    > I did two bisect rounds (complete log on the bug reports) and found the
    > first bad commit to be:
    >
    > a2c76b83fdd763c826f38a55127ccf25708099ce is the first bad commit
    > commit a2c76b83fdd763c826f38a55127ccf25708099ce
    > Author: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
    > Date: Tue Oct 18 20:05:50 2011 -0700
    >
    > usb: renesas_usbhs: fixup inconsistent return from usbhs_pkt_push()
    >
    > usbhs_pkt_push() had inconsistent return under spin lock.
    > This patch fix it up.
    > Special thanks to Dan
    >
    > Cc: Dan Carpenter <dan.carpenter@oracle.com>
    > Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
    > Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    >
    > :040000 040000 08d80fa06121151b36ae17dc693c14d58c0d5db3
    > 86b920618ceb575cebf610798c24a104dea36a2c M drivers
    >
    > Reverting this commit on top of 3.2.1 removes the BUG().

    Very odd, it wouldn't seem that this patch would cause such a problem,
    as it is "obviously" correct.

    Kuninori, any thoughts about this? Should I revert this from the tree?

    thanks,

    greg k-h


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