Thomas/Paul, Resumed my laptop (T60, 64-bit kernel) and after about five minutes of doing nothing but surfing with firefox, got the following RCU stall notification from a 2.6.33.4-rt20 kernel: INFO: RCU detected CPU 1 stall (t=0 jiffies) sending NMI to all CPUs: NMI backtrace for cpu 1 CPU 1 Pid: 0, comm: swapper Not tainted 2.6.33.4-rt20 #37 / RIP: 0010:[<ffffffff8120f188>] [<ffffffff8120f188>] __const_udelay+0x37/0x44 RSP: 0018:ffff88000a303dc8 EFLAGS: 00000002 RAX: 0000000001062560 RBX: 0000000000000001 RCX: ffff88000a300000 RDX: 000000001dba61d0 RSI: 0000000000000002 RDI: 0000000000418958 RBP: ffff88000a303dc8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88000a30b8b0 R13: ffffffff81a7c800 R14: ffff88000a303f48 R15: ffff88000a30b5e0 FS: 0000000000000000(0000) GS:ffff88000a300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 00007f5fedd4b000 CR3: 0000000001a56000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process swapper (pid: 0, threadinfo ffff8800bf1d8000, task ffff8800bf1d67c0) Stack: ffff88000a303de8 ffffffff810185aa 000000000000088e ffffffff81a7c800 <0> ffff88000a303e38 ffffffff81092650 ffff8800bf1d9dc8 0000000000000001 <0> ffff88000a303e58 0000000000000001 0000000000000001 0000000000000000 Call Trace: <IRQ> [<ffffffff810185aa>] arch_trigger_all_cpu_backtrace+0x56/0x62 [<ffffffff81092650>] __rcu_pending+0x6e/0x2d3 [<ffffffff81092909>] rcu_check_callbacks+0x54/0x15b [<ffffffff8104972e>] update_process_times+0x46/0x5b [<ffffffff810656ed>] tick_sched_timer+0x7a/0xa4 [<ffffffff8105b7ca>] __run_hrtimer+0x130/0x1bd [<ffffffff81065673>] ? tick_sched_timer+0x0/0xa4 [<ffffffff8105bb9f>] hrtimer_interrupt+0xdc/0x1dd [<ffffffff8143bcb4>] smp_apic_timer_interrupt+0x89/0x9c [<ffffffff81003593>] apic_timer_interrupt+0x13/0x20 <EOI> [<ffffffff81275cd8>] ? acpi_idle_enter_bm+0x2b0/0x2db [<ffffffff81275cce>] ? acpi_idle_enter_bm+0x2a6/0x2db [<ffffffff81370a67>] cpuidle_idle_call+0x96/0x11f [<ffffffff81001da9>] cpu_idle+0xab/0xee [<ffffffff81430232>] start_secondary+0x1a5/0x1a9 Code: 00 ff 00 00 48 8d 04 bd 00 00 00 00 65 8b 0c 25 78 ac 00 00 48 63 c9 48 8b 0c cd 60 23 af 81 48 69 94 0a 98 00 00 00 fa 00 00 00 <f7> e2 48 8d 7a 01 e8 ad ff ff ff c9 c3 55 48 89 e5 0f 1f 44 00 Call Trace: <#MC> <<EOE>> Pid: 0, comm: swapper Not tainted 2.6.33.4-rt20 #37 Call Trace: <NMI> [<ffffffff81001a9c>] ? show_regs+0x2b/0x30 [<ffffffff814380bd>] nmi_watchdog_tick+0xc2/0x1a6 [<ffffffff814376c3>] do_nmi+0xb5/0x25b [<ffffffff814371aa>] nmi+0x1a/0x20 [<ffffffff8120f188>] ? __const_udelay+0x37/0x44 <<EOE>> <IRQ> [<ffffffff810185aa>] arch_trigger_all_cpu_backtrace+0x56/0x62 [<ffffffff81092650>] __rcu_pending+0x6e/0x2d3 [<ffffffff81092909>] rcu_check_callbacks+0x54/0x15b [<ffffffff8104972e>] update_process_times+0x46/0x5b [<ffffffff810656ed>] tick_sched_timer+0x7a/0xa4 [<ffffffff8105b7ca>] __run_hrtimer+0x130/0x1bd [<ffffffff81065673>] ? tick_sched_timer+0x0/0xa4 [<ffffffff8105bb9f>] hrtimer_interrupt+0xdc/0x1dd [<ffffffff8143bcb4>] smp_apic_timer_interrupt+0x89/0x9c [<ffffffff81003593>] apic_timer_interrupt+0x13/0x20 <EOI> [<ffffffff81275cd8>] ? acpi_idle_enter_bm+0x2b0/0x2db [<ffffffff81275cce>] ? acpi_idle_enter_bm+0x2a6/0x2db [<ffffffff81370a67>] cpuidle_idle_call+0x96/0x11f [<ffffffff81001da9>] cpu_idle+0xab/0xee [<ffffffff81430232>] start_secondary+0x1a5/0x1a9 NMI backtrace for cpu 0 CPU 0 Pid: 31, comm: events/0 Not tainted 2.6.33.4-rt20 #37 / RIP: 0010:[<ffffffff813c124d>] [<ffffffff813c124d>] rt_worker_func+0xd3/0x2de RSP: 0018:ffff8800bf1ddd80 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000002770 RCX: ffff8800b8a13b80 RDX: 0000000000002770 RSI: ffff8800bf1ddfd8 RDI: ffff8800b893a760 RBP: ffff8800bf1dddf0 R08: ffff8800bf1dc000 R09: ffff8800bf1da800 R10: ffff88000a210000 R11: 0000000000000001 R12: 0000000000006666 R13: 0000000000000000 R14: 00000000000062b0 R15: 0000000000013b80 FS: 0000000000000000(0000) GS:ffff88000a200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 00007fbe40a86000 CR3: 0000000001a56000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process events/0 (pid: 31, threadinfo ffff8800bf1dc000, task ffff8800bf1da800) Stack: ffff8800bf1dddc0 ffff8800b8a135a0 0000000000000000 ffff8800bf1ddfd8 <0> 0000000000002760 00000000000493e0 0000000000000000 00000000000493e0 <0> ffff8800bf1dc000 ffff88000a212ac0 ffff8800bf1da800 ffff8800bf1dc000 Call Trace: [<ffffffff81053f0f>] worker_thread+0x206/0x2a3 [<ffffffff813c117a>] ? rt_worker_func+0x0/0x2de [<ffffffff81058360>] ? autoremove_wake_function+0x0/0x39 [<ffffffff81053d09>] ? worker_thread+0x0/0x2a3 [<ffffffff81053d09>] ? worker_thread+0x0/0x2a3 [<ffffffff81057fbd>] kthread+0x7f/0x87 [<ffffffff810039d4>] kernel_thread_helper+0x4/0x10 [<ffffffff81057f3e>] ? kthread+0x0/0x87 [<ffffffff810039d0>] ? kernel_thread_helper+0x0/0x10 Code: 00 00 00 00 4c 89 f9 48 03 0d 98 63 73 00 a8 08 74 15 48 89 55 90 48 89 4d 98 e8 67 3c 07 00 48 8b 4d 98 48 8b 55 90 48 83 39 00 <0f> 84 86 01 00 00 48 63 45 c8 48 89 4d 98 48 89 45 b8 81 e2 ff Call Trace: <#MC> <<EOE>> Pid: 31, comm: events/0 Not tainted 2.6.33.4-rt20 #37 Call Trace: <NMI> [<ffffffff81001a9c>] ? show_regs+0x2b/0x30 [<ffffffff814380bd>] nmi_watchdog_tick+0xc2/0x1a6 [<ffffffff814376c3>] do_nmi+0xb5/0x25b [<ffffffff814371aa>] nmi+0x1a/0x20 [<ffffffff813c124d>] ? rt_worker_func+0xd3/0x2de <<EOE>> [<ffffffff81053f0f>] worker_thread+0x206/0x2a3 [<ffffffff813c117a>] ? rt_worker_func+0x0/0x2de [<ffffffff81058360>] ? autoremove_wake_function+0x0/0x39 [<ffffffff81053d09>] ? worker_thread+0x0/0x2a3 [<ffffffff81053d09>] ? worker_thread+0x0/0x2a3 [<ffffffff81057fbd>] kthread+0x7f/0x87 [<ffffffff810039d4>] kernel_thread_helper+0x4/0x10 [<ffffffff81057f3e>] ? kthread+0x0/0x87 [<ffffffff810039d0>] ? kernel_thread_helper+0x0/0x10
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