[LKP] [PCI, x86] 991de2e590: EIP is at _raw_spin_unlock_irqrestore

Greetings, 0day kernel testing robot got the below dmesg and the first bad commit is git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master commit 991de2e59090e55c65a7f59a049142e3c480f7bd Author: Jiang Liu <jiang.liu(a)linux.intel.com&gt; AuthorDate: Wed Jun 10 16:54:59 2015 +0800 Commit: Bjorn Helgaas <bhelgaas(a)google.com&gt; CommitDate: Thu Jul 30 14:05:57 2015 -0500 PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq() To support IOAPIC hotplug, we need to allocate PCI IRQ resources on demand and free them when not used anymore. Implement pcibios_alloc_irq() and pcibios_free_irq() to dynamically allocate and free PCI IRQs. Remove mp_should_keep_irq(), which is no longer used. [bhelgaas: changelog] Signed-off-by: Jiang Liu <jiang.liu(a)linux.intel.com&gt; Signed-off-by: Bjorn Helgaas <bhelgaas(a)google.com&gt; Acked-by: Thomas Gleixner <tglx(a)linutronix.de&gt; +------------------------------------------------+------------+------------+------------+ | | 890e484758 | 991de2e590 | ccce1c6482 | +------------------------------------------------+------------+------------+------------+ | boot_successes | 1009 | 682 | 26 | | boot_failures | 0 | 228 | 15 | | EIP_is_at_lock_is_held | 0 | 4 | | | Kernel_panic-not_syncing:softlockup:hung_tasks | 0 | 228 | 12 | | backtrace:__pci_register_driver | 0 | 228 | 12 | | backtrace:pcistub_init | 0 | 228 | 12 | | backtrace:kernel_init_freeable | 0 | 228 | 12 | | EIP_is_at_rcu_lockdep_current_cpu_online | 0 | 1 | | | EIP_is_at__slab_alloc | 0 | 96 | 7 | | EIP_is_at_raw_spin_unlock_irqrestore | 0 | 107 | 5 | | EIP_is_at__phys_addr | 0 | 1 | | | EIP_is_at_kmem_cache_free | 0 | 6 | | | EIP_is_at_lockdep_trace_alloc | 0 | 3 | | | EIP_is_at_acpi_ps_parse_loop | 0 | 2 | | | EIP_is_at_check_bytes_and_report | 0 | 1 | | | EIP_is_at__free_pages | 0 | 1 | | | EIP_is_at_ftrace_likely_update | 0 | 1 | | | EIP_is_at_acpi_ut_update_object_reference | 0 | 1 | | | EIP_is_at_acpi_ps_complete_this_op | 0 | 1 | | | EIP_is_at_acpi_ut_push_generic_state | 0 | 1 | | | EIP_is_at__slab_free | 0 | 1 | | | EIP_is_at_acpi_os_acquire_lock | 0 | 1 | | | BUG:kernel_boot_crashed | 0 | 0 | 1 | | IP-Config:Auto-configuration_of_network_failed | 0 | 0 | 2 | +------------------------------------------------+------------+------------+------------+ [ 93.225024] irq event stamp: 24182770 [ 93.225024] irq event stamp: 24182770 [ 93.225935] hardirqs last enabled at (24182769): [ 93.225935] hardirqs last enabled at (24182769): [<c1921a0d>] _raw_spin_unlock_irqrestore+0x2d/0x90 [<c1921a0d>] _raw_spin_unlock_irqrestore+0x2d/0x90 [ 93.228345] hardirqs last disabled at (24182770): [ 93.228345] hardirqs last disabled at (24182770): [<c192336c>] apic_timer_interrupt+0x28/0x34 [<c192336c>] apic_timer_interrupt+0x28/0x34 [ 93.250462] softirqs last enabled at (24181726): [ 93.250462] softirqs last enabled at (24181726): [<c108106a>] __do_softirq+0x3ca/0x720 [<c108106a>] __do_softirq+0x3ca/0x720 [ 93.252371] softirqs last disabled at (24181721): [ 93.252371] softirqs last disabled at (24181721): [<c1020f44>] do_softirq_own_stack+0x24/0x30 [<c1020f44>] do_softirq_own_stack+0x24/0x30 [ 93.254601] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.2.0-rc2-00002-g991de2e #1 [ 93.254601] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.2.0-rc2-00002-g991de2e #1 [ 93.256430] task: d0508000 ti: d0502000 task.ti: d0502000 [ 93.256430] task: d0508000 ti: d0502000 task.ti: d0502000 [ 93.257864] EIP: 0060:[<c1921a2e>] EFLAGS: 00000246 CPU: 0 [ 93.257864] EIP: 0060:[<c1921a2e>] EFLAGS: 00000246 CPU: 0 [ 93.259135] EIP is at _raw_spin_unlock_irqrestore+0x4e/0x90 [ 93.259135] EIP is at _raw_spin_unlock_irqrestore+0x4e/0x90 [ 93.260542] EAX: 00000246 EBX: d0484600 ECX: 00000000 EDX: 00000000 [ 93.260542] EAX: 00000246 EBX: d0484600 ECX: 00000000 EDX: 00000000 [ 93.272202] ESI: 00000246 EDI: 00000001 EBP: d0503c2c ESP: d0503c24 [ 93.272202] ESI: 00000246 EDI: 00000001 EBP: d0503c2c ESP: d0503c24 [ 93.273797] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 93.273797] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 93.275076] CR0: 8005003b CR2: ffffffff CR3: 01fa7000 CR4: 000006b0 [ 93.275076] CR0: 8005003b CR2: ffffffff CR3: 01fa7000 CR4: 000006b0 [ 93.276554] Stack: [ 93.276554] Stack: [ 93.277102] cfc00ca8 [ 93.277102] cfc00ca8 00000002 00000002 d0503c34 d0503c34 c160b5e4 c160b5e4 d0503c4c d0503c4c c162d2fe c162d2fe d04aa5e8 d04aa5e8 cfc00288 cfc00288 [ 93.279291] 00000003 [ 93.279291] 00000003 00000000 00000000 d0503c68 d0503c68 c162d5b8 c162d5b8 c162d524 c162d524 d07e6000 d07e6000 d07d1288 d07d1288 d0503c9c d0503c9c [ 93.301331] 00000000 [ 93.301331] 00000000 d0503c74 d0503c74 c162d688 c162d688 d07e8000 d07e8000 d0503c8c d0503c8c c161717b c161717b d0731d20 d0731d20 d07e8000 d07e8000 [ 93.303287] Call Trace: [ 93.303287] Call Trace: [ 93.303931] [<c160b5e4>] acpi_os_release_lock+0x8/0xa [ 93.303931] [<c160b5e4>] acpi_os_release_lock+0x8/0xa [ 93.305276] [<c162d2fe>] acpi_ut_update_ref_count+0x42/0x270 [ 93.305276] [<c162d2fe>] acpi_ut_update_ref_count+0x42/0x270 [ 93.306774] [<c162d5b8>] acpi_ut_update_object_reference+0x8c/0x144 [ 93.306774] [<c162d5b8>] acpi_ut_update_object_reference+0x8c/0x144 [ 93.308359] [<c162d524>] ? acpi_ut_update_ref_count+0x268/0x270 [ 93.308359] [<c162d524>] ? acpi_ut_update_ref_count+0x268/0x270 [ 93.330943] [<c162d688>] acpi_ut_add_reference+0x18/0x1b [ 93.330943] [<c162d688>] acpi_ut_add_reference+0x18/0x1b [ 93.332316] [<c161717b>] acpi_ds_method_data_get_value+0xcc/0xd8 [ 93.332316] [<c161717b>] acpi_ds_method_data_get_value+0xcc/0xd8 [ 93.333917] [<c162156d>] acpi_ex_resolve_to_value+0x6c/0x1bb [ 93.333917] [<c162156d>] acpi_ex_resolve_to_value+0x6c/0x1bb [ 93.335313] [<c1621a6e>] acpi_ex_resolve_operands+0x19d/0x41f [ 93.335313] [<c1621a6e>] acpi_ex_resolve_operands+0x19d/0x41f [ 93.336670] [<c161873b>] acpi_ds_exec_end_op+0xd3/0x37b [ 93.336670] [<c161873b>] acpi_ds_exec_end_op+0xd3/0x37b [ 93.337934] [<c16284eb>] acpi_ps_parse_loop+0x478/0x4c3 [ 93.337934] [<c16284eb>] acpi_ps_parse_loop+0x478/0x4c3 [ 93.339192] [<c1628e16>] acpi_ps_parse_aml+0x85/0x230 [ 93.339192] [<c1628e16>] acpi_ps_parse_aml+0x85/0x230 [ 93.350455] [<c162952f>] acpi_ps_execute_method+0x18a/0x220 [ 93.350455] [<c162952f>] acpi_ps_execute_method+0x18a/0x220 [ 93.360873] [<c1624a2d>] acpi_ns_evaluate+0x185/0x1ff [ 93.360873] [<c1624a2d>] acpi_ns_evaluate+0x185/0x1ff [ 93.362098] [<c162d8e0>] acpi_ut_evaluate_object+0x79/0x175 [ 93.362098] [<c162d8e0>] acpi_ut_evaluate_object+0x79/0x175 [ 93.363405] [<c162a71f>] acpi_rs_get_prt_method_data+0x1a/0x3a [ 93.363405] [<c162a71f>] acpi_rs_get_prt_method_data+0x1a/0x3a [ 93.364840] [<c162a9b9>] acpi_get_irq_routing_table+0x1d/0x21 [ 93.364840] [<c162a9b9>] acpi_get_irq_routing_table+0x1d/0x21 [ 93.366222] [<c16136ae>] acpi_pci_irq_find_prt_entry+0x73/0x173 [ 93.366222] [<c16136ae>] acpi_pci_irq_find_prt_entry+0x73/0x173 [ 93.367693] [<c16137cb>] acpi_pci_irq_lookup+0x1d/0x11c [ 93.367693] [<c16137cb>] acpi_pci_irq_lookup+0x1d/0x11c [ 93.368950] [<c1613a67>] acpi_pci_irq_disable+0x27/0x68 [ 93.368950] [<c1613a67>] acpi_pci_irq_disable+0x27/0x68 [ 93.391267] [<c18bbebf>] pcibios_free_irq+0xf/0x20 [ 93.391267] [<c18bbebf>] pcibios_free_irq+0xf/0x20 [ 93.392433] [<c15e1b5a>] pci_device_probe+0xca/0x100 [ 93.392433] [<c15e1b5a>] pci_device_probe+0xca/0x100 [ 93.393619] [<c124b470>] ? sysfs_create_link+0x20/0x40 [ 93.393619] [<c124b470>] ? sysfs_create_link+0x20/0x40 [ 93.394856] [<c16a06c5>] driver_probe_device+0x135/0x2d0 [ 93.394856] [<c16a06c5>] driver_probe_device+0x135/0x2d0 [ 93.396114] [<c15e1701>] ? pci_match_device+0x21/0x100 [ 93.396114] [<c15e1701>] ? pci_match_device+0x21/0x100 [ 93.397361] [<c16a08f1>] __driver_attach+0x91/0xa0 [ 93.397361] [<c16a08f1>] __driver_attach+0x91/0xa0 [ 93.398490] [<c16a0860>] ? driver_probe_device+0x2d0/0x2d0 [ 93.398490] [<c16a0860>] ? driver_probe_device+0x2d0/0x2d0 [ 93.399826] [<c169ecef>] bus_for_each_dev+0x4f/0x80 [ 93.399826] [<c169ecef>] bus_for_each_dev+0x4f/0x80 [ 93.420048] [<c16a09e9>] driver_attach+0x19/0x20 [ 93.420048] [<c16a09e9>] driver_attach+0x19/0x20 [ 93.421164] [<c16a0860>] ? driver_probe_device+0x2d0/0x2d0 [ 93.421164] [<c16a0860>] ? driver_probe_device+0x2d0/0x2d0 [ 93.422470] [<c169f687>] bus_add_driver+0x197/0x210 [ 93.422470] [<c169f687>] bus_add_driver+0x197/0x210 [ 93.423619] [<c16a1a9b>] driver_register+0x6b/0xf0 [ 93.423619] [<c16a1a9b>] driver_register+0x6b/0xf0 [ 93.424786] [<c1df8f61>] ? platform_pci_module_init+0x16/0x16 [ 93.424786] [<c1df8f61>] ? platform_pci_module_init+0x16/0x16 [ 93.426157] [<c15e1bd5>] __pci_register_driver+0x45/0x50 [ 93.426157] [<c15e1bd5>] __pci_register_driver+0x45/0x50 [ 93.427402] [<c1df8f84>] pcistub_init+0x23/0x243 [ 93.427402] [<c1df8f84>] pcistub_init+0x23/0x243 [ 93.428557] [<c11c5242>] ? kfree+0x3e2/0x460 [ 93.428557] [<c11c5242>] ? kfree+0x3e2/0x460 [ 93.429560] [<c1dbcc2c>] ? do_one_initcall+0x77/0x177 [ 93.429560] [<c1dbcc2c>] ? do_one_initcall+0x77/0x177 [ 93.441915] [<c1dbcc2c>] ? do_one_initcall+0x77/0x177 [ 93.441915] [<c1dbcc2c>] ? do_one_initcall+0x77/0x177 [ 93.443223] [<c1df8f61>] ? platform_pci_module_init+0x16/0x16 [ 93.443223] [<c1df8f61>] ? platform_pci_module_init+0x16/0x16 [ 93.451777] [<c1dbcc85>] do_one_initcall+0xd0/0x177 [ 93.451777] [<c1dbcc85>] do_one_initcall+0xd0/0x177 [ 93.456115] [<c1dbcec4>] ? kernel_init_freeable+0x198/0x235 [ 93.456115] [<c1dbcec4>] ? kernel_init_freeable+0x198/0x235 [ 93.457441] [<c1dbcee4>] kernel_init_freeable+0x1b8/0x235 [ 93.457441] [<c1dbcee4>] kernel_init_freeable+0x1b8/0x235 [ 93.461852] [<c190d53b>] kernel_init+0xb/0xe0 [ 93.461852] [<c190d53b>] kernel_init+0xb/0xe0 [ 93.468044] [<c1922761>] ret_from_kernel_thread+0x21/0x30 [ 93.468044] [<c1922761>] ret_from_kernel_thread+0x21/0x30 [ 93.469464] [<c190d530>] ? rest_init+0x120/0x120 [ 93.469464] [<c190d530>] ? rest_init+0x120/0x120 [ 93.470690] Code: [ 93.470690] Code: 02 02 00 00 00 00 74 74 38 38 e8 e8 73 73 ac ac 7b 7b ff ff a1 a1 78 78 6d 6d ca ca c1 c1 85 85 c0 c0 b8 b8 1c 1c 91 91 d7 d7 c1 c1 0f 0f 94 94 c3 c3 31 31 c9 c9 0f 0f b6 b6 d3 d3 e8 e8 1a 1a 31 31 83 83 ff ff 84 84 db db 75 75 43 43 89 89 f0 f0 50 50 9d 9d <8d> <8d> 74 74 26 26 00 00 5b 5b 64 64 ff ff 0d 0d c4 c4 41 41 e5 e5 c1 c1 5e 5e 5d 5d c3 c3 8d 8d 76 76 00 00 8b 8b 15 15 78 78 [ 93.494087] Kernel panic - not syncing: softlockup: hung tasks [ 93.494087] Kernel panic - not syncing: softlockup: hung tasks [ 93.495567] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G L 4.2.0-rc2-00002-g991de2e #1 [ 93.495567] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G L 4.2.0-rc2-00002-g991de2e #1 [ 93.497762] 00000016 [ 93.497762] 00000016 00000000 00000000 d0503af0 d0503af0 c1917c51 c1917c51 d0c30200 d0c30200 d0503b08 d0503b08 c19119c8 c19119c8 00000016 00000016 [ 93.519979] d0c30201 [ 93.519979] d0c30201 00000016 00000016 00000040 00000040 d0503b3c d0503b3c c113fd11 c113fd11 c1bb2ef4 c1bb2ef4 00000000 00000000 00000016 00000016 [ 93.522114] d05083e4 [ 93.522114] d05083e4 00000001 00000001 d0503be8 d0503be8 00000000 00000000 00000040 00000040 d0c2fd01 d0c2fd01 00000000 00000000 d0c30200 d0c30200 [ 93.524249] Call Trace: [ 93.524249] Call Trace: [ 93.524885] [<c1917c51>] dump_stack+0x48/0x60 [ 93.524885] [<c1917c51>] dump_stack+0x48/0x60 [ 93.526027] [<c19119c8>] panic+0xa0/0x1c5 [ 93.526027] [<c19119c8>] panic+0xa0/0x1c5 [ 93.527083] [<c113fd11>] watchdog_timer_fn+0x231/0x240 [ 93.527083] [<c113fd11>] watchdog_timer_fn+0x231/0x240 [ 93.528413] [<c110f54d>] __hrtimer_run_queues+0x17d/0x860 [ 93.528413] [<c110f54d>] __hrtimer_run_queues+0x17d/0x860 [ 93.549840] [<c113fae0>] ? watchdog+0x40/0x40 [ 93.549840] [<c113fae0>] ? watchdog+0x40/0x40 [ 93.551023] [<c1110e51>] hrtimer_interrupt+0xa1/0x1b0 [ 93.551023] [<c1110e51>] hrtimer_interrupt+0xa1/0x1b0 [ 93.552333] [<c10ff2b7>] ? rcu_irq_enter+0x147/0x320 [ 93.552333] [<c10ff2b7>] ? rcu_irq_enter+0x147/0x320 [ 93.553621] [<c1055b8e>] local_apic_timer_interrupt+0x2e/0x60 [ 93.553621] [<c1055b8e>] local_apic_timer_interrupt+0x2e/0x60 [ 93.555096] [<c10562ce>] smp_apic_timer_interrupt+0x2e/0x50 [ 93.555096] [<c10562ce>] smp_apic_timer_interrupt+0x2e/0x50 [ 93.556512] [<c1923373>] apic_timer_interrupt+0x2f/0x34 [ 93.556512] [<c1923373>] apic_timer_interrupt+0x2f/0x34 [ 93.557902] [<c1921a2e>] ? _raw_spin_unlock_irqrestore+0x4e/0x90 [ 93.557902] [<c1921a2e>] ? _raw_spin_unlock_irqrestore+0x4e/0x90 [ 93.559427] [<c160b5e4>] acpi_os_release_lock+0x8/0xa [ 93.559427] [<c160b5e4>] acpi_os_release_lock+0x8/0xa [ 93.580750] [<c162d2fe>] acpi_ut_update_ref_count+0x42/0x270 [ 93.580750] [<c162d2fe>] acpi_ut_update_ref_count+0x42/0x270 [ 93.582206] [<c162d5b8>] acpi_ut_update_object_reference+0x8c/0x144 [ 93.582206] [<c162d5b8>] acpi_ut_update_object_reference+0x8c/0x144 [ 93.583787] [<c162d524>] ? acpi_ut_update_ref_count+0x268/0x270 [ 93.583787] [<c162d524>] ? acpi_ut_update_ref_count+0x268/0x270 [ 93.585303] [<c162d688>] acpi_ut_add_reference+0x18/0x1b [ 93.585303] [<c162d688>] acpi_ut_add_reference+0x18/0x1b [ 93.586644] [<c161717b>] acpi_ds_method_data_get_value+0xcc/0xd8 [ 93.586644] [<c161717b>] acpi_ds_method_data_get_value+0xcc/0xd8 [ 93.588195] [<c162156d>] acpi_ex_resolve_to_value+0x6c/0x1bb [ 93.588195] [<c162156d>] acpi_ex_resolve_to_value+0x6c/0x1bb [ 93.589635] [<c1621a6e>] acpi_ex_resolve_operands+0x19d/0x41f [ 93.589635] [<c1621a6e>] acpi_ex_resolve_operands+0x19d/0x41f [ 93.602078] [<c161873b>] acpi_ds_exec_end_op+0xd3/0x37b [ 93.602078] [<c161873b>] acpi_ds_exec_end_op+0xd3/0x37b [ 93.603348] [<c16284eb>] acpi_ps_parse_loop+0x478/0x4c3 [ 93.603348] [<c16284eb>] acpi_ps_parse_loop+0x478/0x4c3 [ 93.604603] [<c1628e16>] acpi_ps_parse_aml+0x85/0x230 [ 93.604603] [<c1628e16>] acpi_ps_parse_aml+0x85/0x230 [ 93.605814] [<c162952f>] acpi_ps_execute_method+0x18a/0x220 [ 93.605814] [<c162952f>] acpi_ps_execute_method+0x18a/0x220 [ 93.607137] [<c1624a2d>] acpi_ns_evaluate+0x185/0x1ff [ 93.607137] [<c1624a2d>] acpi_ns_evaluate+0x185/0x1ff [ 93.608338] [<c162d8e0>] acpi_ut_evaluate_object+0x79/0x175 [ 93.608338] [<c162d8e0>] acpi_ut_evaluate_object+0x79/0x175 [ 93.609660] [<c162a71f>] acpi_rs_get_prt_method_data+0x1a/0x3a [ 93.609660] [<c162a71f>] acpi_rs_get_prt_method_data+0x1a/0x3a git bisect start ccce1c6482a6b7d65dbcc3b5a19f75b21593084d c13dcf9f2d6f5f06ef1bf79ec456df614c5e058b -- git bisect bad 2d8122fc32cc4a851d314cf12ee26a305b16a423 # 08:28 0- 67 Merge 'omap-dss2/for-next' into devel-spot-201508242215 git bisect bad a992f0007c196a9b34abb2c36e7ff74705e6cd97 # 08:28 0- 492 Merge 'hid/for-4.3/upstream' into devel-spot-201508242215 git bisect good 27fcb4e74ef3616949d7bc368beccfae56059a8c # 09:49 903+ 25 Merge 'block/for-next' into devel-spot-201508242215 git bisect good 5a9338b97096963d071ac2ffcaa8329e027bd6a3 # 11:08 910+ 8 Merge 'pci/pci/misc' into devel-spot-201508242215 git bisect bad 7585be060dc998dbb71d4a100e62aea5d6995b56 # 11:20 7- 12 Merge 'pci/next' into devel-spot-201508242215 git bisect good faf512cd1c5d1b8d6ee13f48915e099469313d3f # 12:50 907+ 97 Merge 'hch-pmem/nvdimm-no-pfn' into devel-spot-201508242215 git bisect good 3bd2e6fa9c4857054f6dbaedccd9d10ed79ac713 # 14:12 910+ 40 Merge 'hch-pmem/dma-mapping-cleanups-post' into devel-spot-201508242215 git bisect good 8faae0b69e773695066c21829f261199eb35613b # 15:28 910+ 125 Merge 'krzk/track/kgene-for-next' into devel-spot-201508242215 git bisect good 24b390aad2930b889b6e15fc7cf7bfa7c99fad21 # 16:48 910+ 0 PCI: Remove unused "pci_probe" flags git bisect good cd66d5c3df7c96cbf75010b964b94032ceca8889 # 18:11 910+ 1 Merge branches 'pci/host-designware', 'pci/host-xgene' and 'pci/host-xilinx' into next git bisect bad 5f2269916b0e509f2926346b58209abfa8316143 # 18:27 111- 8 PCI/MSI: Free legacy IRQ when enabling MSI/MSI-X git bisect bad 991de2e59090e55c65a7f59a049142e3c480f7bd # 18:34 11- 17 PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq() git bisect good 890e4847587fcff5eb0438e90992ad7d2a261f33 # 19:54 910+ 0 PCI: Add pcibios_alloc_irq() and pcibios_free_irq() # first bad commit: [991de2e59090e55c65a7f59a049142e3c480f7bd] PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq() git bisect good 890e4847587fcff5eb0438e90992ad7d2a261f33 # 20:00 1005+ 0 PCI: Add pcibios_alloc_irq() and pcibios_free_irq() # extra tests with DEBUG_INFO git bisect bad 991de2e59090e55c65a7f59a049142e3c480f7bd # 20:21 124- 6 PCI, x86: Implement pcibios_alloc_irq() and pcibios_free_irq() # extra tests on HEAD of linux-devel/devel-spot-201508242215 git bisect bad ccce1c6482a6b7d65dbcc3b5a19f75b21593084d # 20:21 0- 15 0day head guard for 'devel-spot-201508242215' # extra tests on tree/branch linux-next/master # extra tests on tree/branch linus/master git bisect good c13dcf9f2d6f5f06ef1bf79ec456df614c5e058b # 21:45 1010+ 11 Linux 4.2-rc8 # extra tests on tree/branch linux-next/master This script may reproduce the error. ---------------------------------------------------------------------------- #!/bin/bash kernel=$1 kvm=( qemu-system-x86_64 -enable-kvm -cpu kvm64 -kernel $kernel -m 300 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -serial stdio -display none -monitor null ) append=( hung_task_panic=1 earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw drbd.minor_count=8 ) "${kvm[@]}" --append "${append[*]}" ---------------------------------------------------------------------------- --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation