detected stall on CPU 1 (t=0 jiffies) - huh?

[Tilman Schmidt <tilman@xxxxxxx>]

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Last night my working machine produced the attached kernel messages.
The machine was completely idle at the time. If I understand
Documentation/RCU/stallwarn.txt and kernel/linux/kernel/rcutree.c
correctly, "t=0 jiffies" is somewhat nonsensical.

uname -a says:
Linux xenon 3.2.2-capigig #1 SMP PREEMPT Sat Jan 28 01:59:16 CET 2012
x86_64 x86_64 x86_64 GNU/Linux

The processor is a dual core Intel Pentium D. The taint is from the
VirtualBox modules, in case it matters.

Should I just ignore that message?

- -- 
Tilman Schmidt                    E-Mail: tilman@xxxxxxx
Bonn, Germany
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[1389988.051712] [drm] nouveau 0000:01:00.0: Setting dpms mode 3 on tmds encoder (output 3)
[1396398.635011] INFO: rcu_bh detected stall on CPU 1 (t=0 jiffies)
[1396398.635011] sending NMI to all CPUs:
[1396398.635011] NMI backtrace for cpu 1
[1396398.635011] CPU 1 
[1396398.635011] Modules linked in: nls_utf8 sha256_generic ansi_cprng krng eseqiv rng cryptd crypto_wq aes_x86_64 aes_generic cbc cryptomgr aead pcompress dm_crypt crypto_hash crypto_blkcipher crypto_algapi nls_iso8859_1 nls_cp437 vfat fat ip6t_LOG xt_pkttype ipt_LOG xt_limit xt_tcpudp vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) fuse af_packet edd ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw xt_NOTRACK ipt_REJECT iptable_raw iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables snd_pcm_oss snd_mixer_oss cpufreq_conservative cpufreq_userspace snd_seq cpufreq_powersave snd_seq_device acpi_cpufreq mperf capi usblp bas_gigaset gigaset kernelcapi crc_ccitt snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep snd_pcm osst snd_timer e1000e sg st ppdev sr_mod cdrom firewire_ohci firewire_core snd iTCO_wdt crc_itu_t i2c_i801 snd_page_alloc pcspkr iTCO_vendor_support parport_pc tpm_tis parport tpm tpm_bios ext4 jbd2 crc16 linear raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx raid10 raid1 raid0 nouveau ttm drm_kms_helper drm i2c_algo_bit mxm_wmi wmi video intel_agp button intel_gtt dm_snapshot dm_mod fan processor thermal thermal_sys aic7xxx scsi_transport_spi ata_generic pata_marvell
[1396398.635011] 
[1396398.635011] Pid: 14294, comm: firefox-bin Tainted: G        W  O 3.2.2-capigig #1                  /DQ965GF
[1396398.635011] RIP: 0010:[<ffffffff811d7118>]  [<ffffffff811d7118>] __sw_hweight64+0x67/0x67
[1396398.635011] RSP: 0000:ffff8801a7c83da0  EFLAGS: 00000006
[1396398.635011] RAX: ffff88019aca5fd8 RBX: 0000000000002710 RCX: 00000000ffffffff
[1396398.635011] RDX: 0000000000000000 RSI: 0000000000000c00 RDI: 0000000000000001
[1396398.635011] RBP: ffff8801a7c83dd8 R08: 0000000000000002 R09: 0000000000000000
[1396398.635011] R10: ffffffff81a170c0 R11: 0000000000000000 R12: 000000000030c762
[1396398.635011] R13: ffffffff81a1ff00 R14: 0000000000000000 R15: 7fffffffffffffff
[1396398.635011] FS:  00007f218b7c6720(0000) GS:ffff8801a7c80000(0000) knlGS:0000000000000000
[1396398.635011] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[1396398.635011] CR2: 00007f217eb02000 CR3: 000000010b499000 CR4: 00000000000006e0
[1396398.635011] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[1396398.635011] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[1396398.635011] Process firefox-bin (pid: 14294, threadinfo ffff88019aca4000, task ffff88000bdd5dc0)
[1396398.635011] Stack:
[1396398.635011]  ffffffff811c6284 ffff8801a7c83dd8 0000000000002710 ffff8801a7c8d940
[1396398.635011]  ffffffff81a1ff00 0000000000000000 7fffffffffffffff ffff8801a7c83de8
[1396398.635011]  ffffffff811c6204 ffff8801a7c83df8 ffffffff811c622d ffff8801a7c83e18
[1396398.635011] Call Trace:
[1396398.635011]  <IRQ> 
[1396398.635011]  [<ffffffff811c6284>] ? delay_tsc+0x23/0xd5
[1396398.635011]  [<ffffffff811c6204>] __delay+0xa/0xc
[1396398.635011]  [<ffffffff811c622d>] __const_udelay+0x27/0x29
[1396398.635011]  [<ffffffff81019e74>] arch_trigger_all_cpu_backtrace+0x62/0x72
[1396398.635011]  [<ffffffff8109f9fe>] __rcu_pending+0x86/0x3b8
[1396398.635011]  [<ffffffff81062b6c>] ? tick_nohz_handler+0xd6/0xd6
[1396398.635011]  [<ffffffff810a02e3>] rcu_check_callbacks+0xe2/0x113
[1396398.635011]  [<ffffffff81048a0d>] update_process_times+0x3c/0x73
[1396398.635011]  [<ffffffff81062bdb>] tick_sched_timer+0x6f/0x8f
[1396398.635011]  [<ffffffff81058910>] __run_hrtimer+0x75/0xeb
[1396398.635011]  [<ffffffff8105908e>] hrtimer_interrupt+0xdf/0x1b2
[1396398.635011]  [<ffffffff813f8403>] ? add_preempt_count+0xa9/0xad
[1396398.635011]  [<ffffffff81019352>] smp_apic_timer_interrupt+0x71/0x84
[1396398.635011]  [<ffffffff813fac70>] apic_timer_interrupt+0x70/0x80
[1396398.635011]  <EOI> 
[1396398.635011]  [<ffffffff813f5a8e>] ? retint_swapgs+0xe/0x13
[1396398.635011] Code: 48 c1 ea 04 48 8d 04 02 48 ba 0f 0f 0f 0f 0f 0f 0f 0f 48 21 d0 48 ba 01 01 01 01 01 01 01 01 48 0f af c2 48 c1 e8 38 5a 5f 5d c3 <55> 48 89 e5 41 55 41 54 53 48 83 ec 08 65 4c 8b 24 25 88 b6 00 
[1396398.635011] Call Trace:
[1396398.635011]  <IRQ>  [<ffffffff811c6284>] ? delay_tsc+0x23/0xd5
[1396398.635011]  [<ffffffff811c6204>] __delay+0xa/0xc
[1396398.635011]  [<ffffffff811c622d>] __const_udelay+0x27/0x29
[1396398.635011]  [<ffffffff81019e74>] arch_trigger_all_cpu_backtrace+0x62/0x72
[1396398.635011]  [<ffffffff8109f9fe>] __rcu_pending+0x86/0x3b8
[1396398.635011]  [<ffffffff81062b6c>] ? tick_nohz_handler+0xd6/0xd6
[1396398.635011]  [<ffffffff810a02e3>] rcu_check_callbacks+0xe2/0x113
[1396398.635011]  [<ffffffff81048a0d>] update_process_times+0x3c/0x73
[1396398.635011]  [<ffffffff81062bdb>] tick_sched_timer+0x6f/0x8f
[1396398.635011]  [<ffffffff81058910>] __run_hrtimer+0x75/0xeb
[1396398.635011]  [<ffffffff8105908e>] hrtimer_interrupt+0xdf/0x1b2
[1396398.635011]  [<ffffffff813f8403>] ? add_preempt_count+0xa9/0xad
[1396398.635011]  [<ffffffff81019352>] smp_apic_timer_interrupt+0x71/0x84
[1396398.635011]  [<ffffffff813fac70>] apic_timer_interrupt+0x70/0x80
[1396398.635011]  <EOI>  [<ffffffff813f5a8e>] ? retint_swapgs+0xe/0x13
[1396398.635670] NMI backtrace for cpu 0
[1396398.635677] CPU 0 
[1396398.635681] Modules linked in: nls_utf8 sha256_generic ansi_cprng krng eseqiv rng cryptd crypto_wq aes_x86_64 aes_generic cbc cryptomgr aead pcompress dm_crypt crypto_hash crypto_blkcipher crypto_algapi nls_iso8859_1 nls_cp437 vfat fat ip6t_LOG xt_pkttype ipt_LOG xt_limit xt_tcpudp vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) fuse af_packet edd ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_raw xt_NOTRACK ipt_REJECT iptable_raw iptable_filter ip6table_mangle nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_ipv4 nf_defrag_ipv4 ip_tables xt_conntrack nf_conntrack ip6table_filter ip6_tables x_tables snd_pcm_oss snd_mixer_oss cpufreq_conservative cpufreq_userspace snd_seq cpufreq_powersave snd_seq_device acpi_cpufreq mperf capi usblp bas_gigaset gigaset kernelcapi crc_ccitt snd_hda_codec_idt snd_hda_intel snd_hda_codec snd_hwdep snd_pcm osst snd_timer e1000e sg st ppdev sr_mod cdrom firewire_ohci firewire_core snd iTCO_wdt crc_itu_t i2c_i801 snd_page_alloc pcspkr iTCO_vendor_support parport_pc tpm_tis parport tpm tpm_bios ext4 jbd2 crc16 linear raid456 async_raid6_recov async_pq raid6_pq async_xor xor async_memcpy async_tx raid10 raid1 raid0 nouveau ttm drm_kms_helper drm i2c_algo_bit mxm_wmi wmi video intel_agp button intel_gtt dm_snapshot dm_mod fan processor thermal thermal_sys aic7xxx scsi_transport_spi ata_generic pata_marvell
[1396398.635935] 
[1396398.635941] Pid: 0, comm: swapper/0 Tainted: G        W  O 3.2.2-capigig #1                  /DQ965GF
[1396398.635952] RIP: 0010:[<ffffffff81008b77>]  [<ffffffff81008b77>] mwait_idle+0x6c/0x88
[1396398.635966] RSP: 0018:ffffffff81a01ef8  EFLAGS: 00000246
[1396398.635972] RAX: 0000000000000000 RBX: ffffffff81a00000 RCX: 0000000000000000
[1396398.635977] RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffffffff81008b6e
[1396398.635981] RBP: ffffffff81a01ef8 R08: 0000000000000000 R09: 0000000000000001
[1396398.635987] R10: ffffffff00000002 R11: ffffffff81a87418 R12: ffffffff81a87418
[1396398.635992] R13: ffff8801a7f21e00 R14: ffffffffffffffff R15: 0000000000000000
[1396398.635998] FS:  0000000000000000(0000) GS:ffff8801a7c00000(0000) knlGS:0000000000000000
[1396398.636004] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[1396398.636004] CR2: 00007f696455b000 CR3: 000000019a12a000 CR4: 00000000000006f0
[1396398.636004] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[1396398.636004] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[1396398.636004] Process swapper/0 (pid: 0, threadinfo ffffffff81a00000, task ffffffff81a0d020)
[1396398.636004] Stack:
[1396398.636004]  ffffffff81a01f28 ffffffff810012b1 ffffffff81a01f28 84c8034076647dfc
[1396398.636004]  0000000000000002 ffffffff81ae3380 ffffffff81a01f58 ffffffff813de7fc
[1396398.636004]  ffffffff813de76c ffffffff81ae3380 ffffffff81a01f58 0000000000000000
[1396398.636004] Call Trace:
[1396398.636004]  [<ffffffff810012b1>] cpu_idle+0xaf/0xe5
[1396398.636004]  [<ffffffff813de7fc>] rest_init+0xd0/0xd7
[1396398.636004]  [<ffffffff813de76c>] ? rest_init+0x40/0xd7
[1396398.636004]  [<ffffffff81aa1b49>] start_kernel+0x3b7/0x3c2
[1396398.636004]  [<ffffffff81aa12a6>] x86_64_start_reservations+0xb6/0xba
[1396398.636004]  [<ffffffff81aa139c>] x86_64_start_kernel+0xf2/0xf9
[1396398.636004] Code: b6 00 00 48 2d c8 1f 00 00 31 d2 48 89 d1 0f 01 c8 0f ae f0 e8 51 ff ff ff 85 c0 75 10 e8 38 f0 05 00 31 c0 48 89 c1 fb 0f 01 c9 <eb> 06 e8 28 f0 05 00 fb e8 94 e5 1c 00 e8 8f e5 1c 00 eb 06 e8 
[1396398.636004] Call Trace:
[1396398.636004]  [<ffffffff810012b1>] cpu_idle+0xaf/0xe5
[1396398.636004]  [<ffffffff813de7fc>] rest_init+0xd0/0xd7
[1396398.636004]  [<ffffffff813de76c>] ? rest_init+0x40/0xd7
[1396398.636004]  [<ffffffff81aa1b49>] start_kernel+0x3b7/0x3c2
[1396398.636004]  [<ffffffff81aa12a6>] x86_64_start_reservations+0xb6/0xba
[1396398.636004]  [<ffffffff81aa139c>] x86_64_start_kernel+0xf2/0xf9
[1433053.535519] bas_gigaset 6-2:1.0: cause code 0523 in connection state 0.