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Date: Thu, 4 Mar 2010 12:44:53 +0100 From: Ingo Molnar <mingo@...e.hu> To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Cc: linux-kernel@...r.kernel.org, laijs@...fujitsu.com, dipankar@...ibm.com, akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org, dvhltc@...ibm.com, niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu, dhowells@...hat.com Subject: Re: [PATCH tip/core/rcu 2/4] rcu: suppress RCU lockdep warnings during early boot -tip testing found this: [ 56.245124] calling sc520_wdt_init+0x0/0xef @ 1 [ 56.245160] sc520_wdt: cannot register miscdev on minor=130 (err=-16) [ 61.444012] INFO: RCU detected CPU stalls: 1 (detected by 0, t=2502 jiffies) [ 61.444012] sending NMI to all CPUs: [ 61.444012] NMI backtrace for cpu 0 [ 61.444012] CPU 0 [ 61.444012] Modules linked in: [ 61.444012] [ 61.444012] Pid: 1, comm: swapper Not tainted 2.6.33-tip-05230-g18d03ff-dirty #20129 A8N-E/System Product Name [ 61.444012] RIP: 0010:[<ffffffff8162319a>] [<ffffffff8162319a>] delay_tsc+0x3d/0xb3 [ 61.444012] RSP: 0018:ffff880005a03d58 EFLAGS: 00000046 [ 61.444012] RAX: 0000000075d2cda3 RBX: 0000000075bf413c RCX: 0000000075d2cda3 [ 61.444012] RDX: 0000000000138c67 RSI: 0000000000000002 RDI: 00000000001e6d83 [ 61.444012] RBP: ffff880005a03d78 R08: 0000000000000000 R09: 0000000000000003 [ 61.444012] R10: 0000000000000005 R11: 0000000000000000 R12: 00000000001e6d83 [ 61.444012] R13: 0000000000000000 R14: 0000000000000000 R15: ffff880005a03f48 [ 61.444012] FS: 0000000000000000(0000) GS:ffff880005a00000(0000) knlGS:0000000000000000 [ 61.444012] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 61.444012] CR2: 0000000000000000 CR3: 0000000003cc9000 CR4: 00000000000006f0 [ 61.444012] DR0: ffffffff8509ff5c DR1: 0000000000000000 DR2: 0000000000000000 [ 61.444012] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 [ 61.444012] Process swapper (pid: 1, threadinfo ffff88003e064000, task ffff88003e068000) [ 61.444012] Stack: [ 61.444012] 00000000000000d1 ffffffff83d34000 0000000000000000 ffffffff83d34000 [ 61.444012] <0> ffff880005a03d88 ffffffff816230ef ffff880005a03d98 ffffffff81623130 [ 61.444012] <0> ffff880005a03db8 ffffffff81052ade 0000000000000000 ffffffff83cf3000 [ 61.444012] Call Trace: [ 61.444012] <IRQ> [ 61.444012] [<ffffffff816230ef>] __delay+0xf/0x11 [ 61.444012] [<ffffffff81623130>] __const_udelay+0x3f/0x41 [ 61.444012] [<ffffffff81052ade>] arch_trigger_all_cpu_backtrace+0x78/0x84 [ 61.444012] [<ffffffff810ee84b>] print_other_cpu_stall+0x10f/0x122 [ 61.444012] [<ffffffff810ee928>] check_cpu_stall+0xca/0xce [ 61.444012] [<ffffffff810ee954>] __rcu_pending+0x28/0xde [ 61.444012] [<ffffffff810eea3f>] rcu_check_callbacks+0x35/0x10a [ 61.444012] [<ffffffff8109a04d>] update_process_times+0x41/0x60 [ 61.444012] [<ffffffff810b60bb>] tick_sched_timer+0x77/0xa1 [ 61.444012] [<ffffffff810aaa02>] __run_hrtimer+0xca/0x129 [ 61.444012] [<ffffffff810b6044>] ? tick_sched_timer+0x0/0xa1 [ 61.444012] [<ffffffff810aac86>] hrtimer_interrupt+0xc7/0x1c3 [ 61.444012] [<ffffffff82bd2996>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 61.444012] [<ffffffff82bd2996>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 61.444012] [<ffffffff82bd9983>] smp_apic_timer_interrupt+0x80/0x93 [ 61.444012] [<ffffffff81035873>] apic_timer_interrupt+0x13/0x20 [ 61.444012] <EOI> [ 61.444012] [<ffffffff810c3be3>] ? generic_exec_single+0x7e/0x95 [ 61.444012] [<ffffffff810ad4ec>] ? cpu_clock+0x6d/0x96 [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff810c3e19>] smp_call_function_single+0x175/0x18b [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff810c3f30>] smp_call_function_many+0x101/0x1d5 [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff810c4026>] smp_call_function+0x22/0x26 [ 61.444012] [<ffffffff810929eb>] on_each_cpu+0x1d/0x65 [ 61.444012] [<ffffffff8106b198>] flush_tlb_all+0x1c/0x1e [ 61.444012] [<ffffffff8113d18c>] vmap_debug_free_range+0x13/0x15 [ 61.444012] [<ffffffff8113e27f>] remove_vm_area+0x6a/0x86 [ 61.444012] [<ffffffff81066994>] iounmap+0xb4/0xcf [ 61.444012] [<ffffffff843f93e4>] sc520_wdt_init+0xe9/0xef [ 61.444012] [<ffffffff843f92fb>] ? sc520_wdt_init+0x0/0xef [ 61.444012] [<ffffffff8100207d>] do_one_initcall+0x72/0x1a6 [ 61.444012] [<ffffffff84387781>] do_basic_setup+0x54/0x66 [ 61.444012] [<ffffffff84387840>] kernel_init+0xad/0xf3 [ 61.444012] [<ffffffff82bd2957>] ? trace_hardirqs_on_thunk+0x3a/0x3f [ 61.444012] [<ffffffff81035cc4>] kernel_thread_helper+0x4/0x10 [ 61.444012] [<ffffffff82bd3910>] ? restore_args+0x0/0x30 [ 61.444012] [<ffffffff84387793>] ? kernel_init+0x0/0xf3 [ 61.444012] [<ffffffff81035cc0>] ? kernel_thread_helper+0x0/0x10 [ 61.444012] Code: 8b 2c 25 08 ea 00 00 49 89 fc 0f ae f0 66 66 90 48 83 3d 71 85 6b 02 00 75 04 0f 0b eb fe e8 53 91 a1 ff 66 90 48 63 d8 0f ae f0 <66> 66 90 48 83 3d 53 85 6b 02 00 75 04 0f 0b eb fe e8 35 91 a1 [ 61.444012] Call Trace: [ 61.444012] <IRQ> [<ffffffff816230ef>] __delay+0xf/0x11 [ 61.444012] [<ffffffff81623130>] __const_udelay+0x3f/0x41 [ 61.444012] [<ffffffff81052ade>] arch_trigger_all_cpu_backtrace+0x78/0x84 [ 61.444012] [<ffffffff810ee84b>] print_other_cpu_stall+0x10f/0x122 [ 61.444012] [<ffffffff810ee928>] check_cpu_stall+0xca/0xce [ 61.444012] [<ffffffff810ee954>] __rcu_pending+0x28/0xde [ 61.444012] [<ffffffff810eea3f>] rcu_check_callbacks+0x35/0x10a [ 61.444012] [<ffffffff8109a04d>] update_process_times+0x41/0x60 [ 61.444012] [<ffffffff810b60bb>] tick_sched_timer+0x77/0xa1 [ 61.444012] [<ffffffff810aaa02>] __run_hrtimer+0xca/0x129 [ 61.444012] [<ffffffff810b6044>] ? tick_sched_timer+0x0/0xa1 [ 61.444012] [<ffffffff810aac86>] hrtimer_interrupt+0xc7/0x1c3 [ 61.444012] [<ffffffff82bd2996>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 61.444012] [<ffffffff82bd2996>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 61.444012] [<ffffffff82bd9983>] smp_apic_timer_interrupt+0x80/0x93 [ 61.444012] [<ffffffff81035873>] apic_timer_interrupt+0x13/0x20 [ 61.444012] <EOI> [<ffffffff810c3be3>] ? generic_exec_single+0x7e/0x95 [ 61.444012] [<ffffffff810ad4ec>] ? cpu_clock+0x6d/0x96 [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff810c3e19>] smp_call_function_single+0x175/0x18b [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff810c3f30>] smp_call_function_many+0x101/0x1d5 [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff810c4026>] smp_call_function+0x22/0x26 [ 61.444012] [<ffffffff810929eb>] on_each_cpu+0x1d/0x65 [ 61.444012] [<ffffffff8106b198>] flush_tlb_all+0x1c/0x1e [ 61.444012] [<ffffffff8113d18c>] vmap_debug_free_range+0x13/0x15 [ 61.444012] [<ffffffff8113e27f>] remove_vm_area+0x6a/0x86 [ 61.444012] [<ffffffff81066994>] iounmap+0xb4/0xcf [ 61.444012] [<ffffffff843f93e4>] sc520_wdt_init+0xe9/0xef [ 61.444012] [<ffffffff843f92fb>] ? sc520_wdt_init+0x0/0xef [ 61.444012] [<ffffffff8100207d>] do_one_initcall+0x72/0x1a6 [ 61.444012] [<ffffffff84387781>] do_basic_setup+0x54/0x66 [ 61.444012] [<ffffffff84387840>] kernel_init+0xad/0xf3 [ 61.444012] [<ffffffff82bd2957>] ? trace_hardirqs_on_thunk+0x3a/0x3f [ 61.444012] [<ffffffff81035cc4>] kernel_thread_helper+0x4/0x10 [ 61.444012] [<ffffffff82bd3910>] ? restore_args+0x0/0x30 [ 61.444012] [<ffffffff84387793>] ? kernel_init+0x0/0xf3 [ 61.444012] [<ffffffff81035cc0>] ? kernel_thread_helper+0x0/0x10 [ 61.444012] Pid: 1, comm: swapper Not tainted 2.6.33-tip-05230-g18d03ff-dirty #20129 [ 61.444012] Call Trace: [ 61.444012] <NMI> [<ffffffff8103ccd0>] ? show_regs+0x2b/0x30 [ 61.444012] [<ffffffff81052b7d>] hw_nmi_is_cpu_stuck+0x54/0xbb [ 61.444012] [<ffffffff810e76a3>] wd_overflow+0x48/0xc8 [ 61.444012] [<ffffffff81116b8f>] __perf_event_overflow+0x184/0x1fd [ 61.444012] [<ffffffff8111371c>] ? rcu_read_unlock+0x1c/0x1e [ 61.444012] [<ffffffff81117040>] perf_event_overflow+0x14/0x16 [ 61.444012] [<ffffffff81043734>] x86_pmu_handle_irq+0xc7/0x106 [ 61.444012] [<ffffffff81034b56>] ? ftrace_call+0x5/0x2b [ 61.444012] [<ffffffff82bd4f4a>] perf_event_nmi_handler+0x42/0x4f [ 61.444012] [<ffffffff82bd6dcb>] notifier_call_chain+0x68/0x9c [ 61.444012] [<ffffffff82bd6e5d>] __atomic_notifier_call_chain+0x5e/0x8b [ 61.444012] [<ffffffff82bd6dff>] ? __atomic_notifier_call_chain+0x0/0x8b [ 61.444012] [<ffffffff82bd6e9e>] atomic_notifier_call_chain+0x14/0x16 [ 61.444012] [<ffffffff82bd6ece>] notify_die+0x2e/0x30 [ 61.444012] [<ffffffff82bd4505>] default_do_nmi+0x57/0x1aa [ 61.444012] [<ffffffff82bd46bb>] do_nmi+0x63/0xa6 [ 61.444012] [<ffffffff82bd3ed0>] nmi+0x20/0x39 [ 61.444012] [<ffffffff8162319a>] ? delay_tsc+0x3d/0xb3 [ 61.444012] <<EOE>> <IRQ> [<ffffffff816230ef>] __delay+0xf/0x11 [ 61.444012] [<ffffffff81623130>] __const_udelay+0x3f/0x41 [ 61.444012] [<ffffffff81052ade>] arch_trigger_all_cpu_backtrace+0x78/0x84 [ 61.444012] [<ffffffff810ee84b>] print_other_cpu_stall+0x10f/0x122 [ 61.444012] [<ffffffff810ee928>] check_cpu_stall+0xca/0xce [ 61.444012] [<ffffffff810ee954>] __rcu_pending+0x28/0xde [ 61.444012] [<ffffffff810eea3f>] rcu_check_callbacks+0x35/0x10a [ 61.444012] [<ffffffff8109a04d>] update_process_times+0x41/0x60 [ 61.444012] [<ffffffff810b60bb>] tick_sched_timer+0x77/0xa1 [ 61.444012] [<ffffffff810aaa02>] __run_hrtimer+0xca/0x129 [ 61.444012] [<ffffffff810b6044>] ? tick_sched_timer+0x0/0xa1 [ 61.444012] [<ffffffff810aac86>] hrtimer_interrupt+0xc7/0x1c3 [ 61.444012] [<ffffffff82bd2996>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 61.444012] [<ffffffff82bd2996>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 61.444012] [<ffffffff82bd9983>] smp_apic_timer_interrupt+0x80/0x93 [ 61.444012] [<ffffffff81035873>] apic_timer_interrupt+0x13/0x20 [ 61.444012] <EOI> [<ffffffff810c3be3>] ? generic_exec_single+0x7e/0x95 [ 61.444012] [<ffffffff810ad4ec>] ? cpu_clock+0x6d/0x96 [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff810c3e19>] smp_call_function_single+0x175/0x18b [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff810c3f30>] smp_call_function_many+0x101/0x1d5 [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff810c4026>] smp_call_function+0x22/0x26 [ 61.444012] [<ffffffff810929eb>] on_each_cpu+0x1d/0x65 [ 61.444012] [<ffffffff8106b198>] flush_tlb_all+0x1c/0x1e [ 61.444012] [<ffffffff8113d18c>] vmap_debug_free_range+0x13/0x15 [ 61.444012] [<ffffffff8113e27f>] remove_vm_area+0x6a/0x86 [ 61.444012] [<ffffffff81066994>] iounmap+0xb4/0xcf [ 61.444012] [<ffffffff843f93e4>] sc520_wdt_init+0xe9/0xef [ 61.444012] [<ffffffff843f92fb>] ? sc520_wdt_init+0x0/0xef [ 61.444012] [<ffffffff8100207d>] do_one_initcall+0x72/0x1a6 [ 61.444012] [<ffffffff84387781>] do_basic_setup+0x54/0x66 [ 61.444012] [<ffffffff84387840>] kernel_init+0xad/0xf3 [ 61.444012] [<ffffffff82bd2957>] ? trace_hardirqs_on_thunk+0x3a/0x3f [ 61.444012] [<ffffffff81035cc4>] kernel_thread_helper+0x4/0x10 [ 61.444012] [<ffffffff82bd3910>] ? restore_args+0x0/0x30 [ 61.444012] [<ffffffff84387793>] ? kernel_init+0x0/0xf3 [ 61.444012] [<ffffffff81035cc0>] ? kernel_thread_helper+0x0/0x10 [ 61.444012] ------------[ cut here ]------------ [ 61.444012] WARNING: at kernel/nmi_watchdog.c:103 wd_overflow+0xa8/0xc8() [ 61.444012] Hardware name: System Product Name [ 61.444012] NMI Watchdog detected LOCKUP on cpu 0 [ 61.444012] Modules linked in: [ 61.444012] Pid: 1, comm: swapper Not tainted 2.6.33-tip-05230-g18d03ff-dirty #20129 [ 61.444012] Call Trace: [ 61.444012] <NMI> [<ffffffff8108c690>] warn_slowpath_common+0x7c/0x94 [ 61.444012] [<ffffffff8108c6ff>] warn_slowpath_fmt+0x41/0x43 [ 61.444012] [<ffffffff810e7703>] wd_overflow+0xa8/0xc8 [ 61.444012] [<ffffffff81116b8f>] __perf_event_overflow+0x184/0x1fd [ 61.444012] [<ffffffff8111371c>] ? rcu_read_unlock+0x1c/0x1e [ 61.444012] [<ffffffff81117040>] perf_event_overflow+0x14/0x16 [ 61.444012] [<ffffffff81043734>] x86_pmu_handle_irq+0xc7/0x106 [ 61.444012] [<ffffffff81034b56>] ? ftrace_call+0x5/0x2b [ 61.444012] [<ffffffff82bd4f4a>] perf_event_nmi_handler+0x42/0x4f [ 61.444012] [<ffffffff82bd6dcb>] notifier_call_chain+0x68/0x9c [ 61.444012] [<ffffffff82bd6e5d>] __atomic_notifier_call_chain+0x5e/0x8b [ 61.444012] [<ffffffff82bd6dff>] ? __atomic_notifier_call_chain+0x0/0x8b [ 61.444012] [<ffffffff82bd6e9e>] atomic_notifier_call_chain+0x14/0x16 [ 61.444012] [<ffffffff82bd6ece>] notify_die+0x2e/0x30 [ 61.444012] [<ffffffff82bd4505>] default_do_nmi+0x57/0x1aa [ 61.444012] [<ffffffff82bd46bb>] do_nmi+0x63/0xa6 [ 61.444012] [<ffffffff82bd3ed0>] nmi+0x20/0x39 [ 61.444012] [<ffffffff8103c2eb>] ? native_read_tsc+0x6/0x16 [ 61.444012] <<EOE>> <IRQ> [<ffffffff816231b0>] delay_tsc+0x53/0xb3 [ 61.444012] [<ffffffff816230ef>] __delay+0xf/0x11 [ 61.444012] [<ffffffff81623130>] __const_udelay+0x3f/0x41 [ 61.444012] [<ffffffff81052ade>] arch_trigger_all_cpu_backtrace+0x78/0x84 [ 61.444012] [<ffffffff810ee84b>] print_other_cpu_stall+0x10f/0x122 [ 61.444012] [<ffffffff810ee928>] check_cpu_stall+0xca/0xce [ 61.444012] [<ffffffff810ee954>] __rcu_pending+0x28/0xde [ 61.444012] [<ffffffff810eea3f>] rcu_check_callbacks+0x35/0x10a [ 61.444012] [<ffffffff8109a04d>] update_process_times+0x41/0x60 [ 61.444012] [<ffffffff810b60bb>] tick_sched_timer+0x77/0xa1 [ 61.444012] [<ffffffff810aaa02>] __run_hrtimer+0xca/0x129 [ 61.444012] [<ffffffff810b6044>] ? tick_sched_timer+0x0/0xa1 [ 61.444012] [<ffffffff810aac86>] hrtimer_interrupt+0xc7/0x1c3 [ 61.444012] [<ffffffff82bd2996>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 61.444012] [<ffffffff82bd2996>] ? trace_hardirqs_off_thunk+0x3a/0x3c [ 61.444012] [<ffffffff82bd9983>] smp_apic_timer_interrupt+0x80/0x93 [ 61.444012] [<ffffffff81035873>] apic_timer_interrupt+0x13/0x20 [ 61.444012] <EOI> [<ffffffff810c3be3>] ? generic_exec_single+0x7e/0x95 [ 61.444012] [<ffffffff810ad4ec>] ? cpu_clock+0x6d/0x96 [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff810c3e19>] smp_call_function_single+0x175/0x18b [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff810c3f30>] smp_call_function_many+0x101/0x1d5 [ 61.444012] [<ffffffff8106b407>] ? do_flush_tlb_all+0x0/0x64 [ 61.444012] [<ffffffff810c4026>] smp_call_function+0x22/0x26 [ 61.444012] [<ffffffff810929eb>] on_each_cpu+0x1d/0x65 [ 61.444012] [<ffffffff8106b198>] flush_tlb_all+0x1c/0x1e [ 61.444012] [<ffffffff8113d18c>] vmap_debug_free_range+0x13/0x15 [ 61.444012] [<ffffffff8113e27f>] remove_vm_area+0x6a/0x86 [ 61.444012] [<ffffffff81066994>] iounmap+0xb4/0xcf [ 61.444012] [<ffffffff843f93e4>] sc520_wdt_init+0xe9/0xef [ 61.444012] [<ffffffff843f92fb>] ? sc520_wdt_init+0x0/0xef [ 61.444012] [<ffffffff8100207d>] do_one_initcall+0x72/0x1a6 [ 61.444012] [<ffffffff84387781>] do_basic_setup+0x54/0x66 [ 61.444012] [<ffffffff84387840>] kernel_init+0xad/0xf3 [ 61.444012] [<ffffffff82bd2957>] ? trace_hardirqs_on_thunk+0x3a/0x3f [ 61.444012] [<ffffffff81035cc4>] kernel_thread_helper+0x4/0x10 [ 61.444012] [<ffffffff82bd3910>] ? restore_args+0x0/0x30 [ 61.444012] [<ffffffff84387793>] ? kernel_init+0x0/0xf3 [ 61.444012] [<ffffffff81035cc0>] ? kernel_thread_helper+0x0/0x10 [ 61.444012] ---[ end trace 8ad7c0dfdb69c782 ]--- [ 63.690872] initcall sc520_wdt_init+0x0/0xef returned -16 after 7271232 usecs [ 63.691219] async/1 used greatest stack depth: 4056 bytes left [ 63.705146] initcall sc520_wdt_init+0x0/0xef returned with error code -16 [ 63.713361] calling ibwdt_init+0x0/0x5f @ 1 [ 63.718983] ib700wdt: WDT driver for IB700 single board computer initialising. [ 63.727703] bus: 'platform': add driver ib700wdt [ 63.735889] Registering platform device 'ib700wdt'. Parent at platform [ 63.742655] device: 'ib700wdt': device_add [ 63.746801] bus: 'platform': add device ib700wdt [ 63.751493] PM: Adding info for platform:ib700wdt [ 63.756790] bus: 'platform': driver_probe_device: matched device ib700wdt with driver ib700wdt [ 63.765590] bus: 'platform': really_probe: probing driver ib700wdt with device ib700wdt [ 63.773644] ib700wdt: START method I/O 443 is not available. [ 63.779348] ib700wdt: probe of ib700wdt failed with error -5 [ 63.785044] initcall ibwdt_init+0x0/0x5f returned 0 after 64505 usecs [ 63.791508] calling ibmasr_init+0x0/0xb0 @ 1 [ 63.795889] initcall ibmasr_init+0x0/0xb0 returned -19 after 2 usecs [ 63.802269] calling wafwdt_init+0x0/0x16a @ 1 [ 63.806735] WDT driver for Wafer 5823 single board computer initialising. [ 63.813547] Wafer 5823 WDT: I/O address 0x0443 already in use [ 63.819317] initcall wafwdt_init+0x0/0x16a returned -5 after 12284 usecs [ 63.826041] initcall wafwdt_init+0x0/0x16a returned with error code -5 [ 63.832674] calling watchdog_init+0x0/0x66 @ 1 [ 63.837228] i6300ESB timer: Intel 6300ESB WatchDog Timer Driver v0.04 [ 63.843703] bus: 'platform': add driver i6300ESB timer [ 63.849416] Registering platform device 'i6300ESB timer'. Parent at platform [ 63.856546] device: 'i6300ESB timer': device_add [ 63.861201] bus: 'platform': add device i6300ESB timer [ 63.866394] PM: Adding info for platform:i6300ESB timer [ 63.872070] bus: 'platform': driver_probe_device: matched device i6300ESB timer with driver i6300ESB timer [ 63.881814] bus: 'platform': really_probe: probing driver i6300ESB timer with device i6300ESB timer [ 63.890951] initcall watchdog_init+0x0/0x66 returned 0 after 52460 usecs [ 63.897672] calling iTCO_wdt_init_module+0x0/0x66 @ 1 [ 63.902828] iTCO_wdt: Intel TCO WatchDog Timer Driver v1.05 [ 63.903751] ata2.01: ATAPI: DVDRW IDE 16X, VER A079, max UDMA/66 [ 63.903776] ata2: nv_mode_filter: 0x1f39f&0x739f->0x739f, BIOS=0x7000 (0xc60000c0) ACPI=0x701f (600:60:0x1c) [ 63.908621] ata2.01: configured for UDMA/33 [ 63.909466] async_waiting @ 4998 [ 63.909473] async_continuing @ 4998 after 3 usec [ 63.910243] scsi 1:0:1:0: CD-ROM DVDRW IDE 16X A079 PQ: 0 ANSI: 5 [ 63.910263] device: 'target1:0:1': device_add [ 63.910300] PM: Adding info for No Bus:target1:0:1 [ 63.910317] device: '1:0:1:0': device_add [ 63.910396] bus: 'scsi': add device 1:0:1:0 [ 63.910427] PM: Adding info for scsi:1:0:1:0 It started triggering after your latest batch of RCU patches. Might be a side effect of my debug_lockdep_rcu_update() fixery perhaps? Config attached. Ingo View attachment "config" of type "text/plain" (67878 bytes) View attachment "config" of type "text/plain" (67879 bytes)
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