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Date: Wed, 27 Aug 2014 10:27:09 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Lan Tianyu <tianyu.lan@...el.com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>,
Jet Chen <jet.chen@...el.com>, Su Tao <tao.su@...el.com>,
Yuanhan Liu <yuanhan.liu@...el.com>, LKP <lkp@...org>,
linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [acpi/osl] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-R} usage.
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
commit b11bc0be2f115a90949f1c26379f1288c8cde531
Author: Lan Tianyu <tianyu.lan@...el.com>
AuthorDate: Tue Aug 26 01:54:34 2014 +0200
Commit: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
CommitDate: Tue Aug 26 01:54:34 2014 +0200
ACPI / OSL: Make acpi_os_map_cleanup() use call_rcu() to avoid deadlocks
Deadlock is possible when CPU hotplug and evaluating ACPI method happen
at the same time.
During CPU hotplug, acpi_cpu_soft_notify() is called under the CPU hotplug
lock. Then, acpi_cpu_soft_notify() calls acpi_bus_get_device() to obtain
the struct acpi_device attached to the given ACPI handle. The ACPICA's
namespace lock will be acquired by acpi_bus_get_device() in the process.
Thus it is possible to hold the ACPICA's namespace lock under the CPU
hotplug lock.
Evaluating an ACPI method may involve accessing an operation region in
system memory and the associated address space will be unmapped under
the ACPICA's namespace lock after completing the access. Currently, osl.c
uses RCU to protect memory ranges used by AML. When unmapping them it
calls synchronize_rcu() in acpi_os_map_cleanup(), but that blocks
CPU hotplug by acquiring the CPU hotplug lock. Thus it is possible to
hold the CPU hotplug lock under the ACPICA's namespace lock.
This leads to deadlocks like the following one if AML accessing operation
regions in memory is executed in parallel with CPU hotplug.
INFO: task bash:741 blocked for more than 30 seconds.
Not tainted 3.16.0-rc5+ #671
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
bash D ffff88014e214140 0 741 716 0x00000080
ffff88009b9f3a10 0000000000000086 ffff88009dcfb840 ffff88009b9f3fd8
0000000000014140 0000000000014140 ffffffff81c18460 ffffffff81c40fc8
ffffffff81c40fcc ffff88009dcfb840 00000000ffffffff ffffffff81c40fd0
Call Trace:
[<ffffffff817a1b29>] schedule_preempt_disabled+0x29/0x70
[<ffffffff817a34fa>] __mutex_lock_slowpath+0xca/0x1c0
[<ffffffff817a360f>] mutex_lock+0x1f/0x2f
[<ffffffff810bc8cc>] get_online_cpus+0x2c/0x50
[<ffffffff8111bbd4>] synchronize_sched_expedited+0x64/0x1c0
[<ffffffff8111bb65>] synchronize_sched+0x45/0x50
[<ffffffff81431498>] acpi_os_map_cleanup.part.7+0x14/0x3e
[<ffffffff81795c54>] acpi_os_unmap_iomem+0xe2/0xea
[<ffffffff81795c6a>] acpi_os_unmap_memory+0xe/0x14
[<ffffffff814459bc>] acpi_ev_system_memory_region_setup+0x2d/0x97
[<ffffffff81459504>] acpi_ut_update_ref_count+0x24d/0x2de
[<ffffffff814596af>] acpi_ut_update_object_reference+0x11a/0x18b
[<ffffffff81459282>] acpi_ut_remove_reference+0x2e/0x31
[<ffffffff8144ffdf>] acpi_ns_detach_object+0x7b/0x80
[<ffffffff8144ef11>] acpi_ns_delete_namespace_subtree+0x47/0x81
[<ffffffff81440488>] acpi_ds_terminate_control_method+0x85/0x11b
[<ffffffff81454625>] acpi_ps_parse_aml+0x164/0x289
[<ffffffff81454da6>] acpi_ps_execute_method+0x1c1/0x26c
[<ffffffff8144f764>] acpi_ns_evaluate+0x1c1/0x258
[<ffffffff81451f86>] acpi_evaluate_object+0x126/0x22f
[<ffffffff8144d1ac>] acpi_hw_execute_sleep_method+0x3d/0x68
[<ffffffff8144d5cf>] ? acpi_hw_enable_all_runtime_gpes+0x17/0x19
[<ffffffff8144deb0>] acpi_hw_legacy_wake+0x4d/0x9d
[<ffffffff8144e599>] acpi_hw_sleep_dispatch+0x2a/0x2c
[<ffffffff8144e5cb>] acpi_leave_sleep_state+0x17/0x19
[<ffffffff8143335c>] acpi_pm_finish+0x3f/0x99
[<ffffffff81108c49>] suspend_devices_and_enter+0x139/0x560
[<ffffffff81109162>] pm_suspend+0xf2/0x370
[<ffffffff81107e69>] state_store+0x79/0xf0
[<ffffffff813bc4af>] kobj_attr_store+0xf/0x20
[<ffffffff81284f3d>] sysfs_kf_write+0x3d/0x50
[<ffffffff81284580>] kernfs_fop_write+0xe0/0x160
[<ffffffff81210f47>] vfs_write+0xb7/0x1f0
[<ffffffff81211ae6>] SyS_write+0x46/0xb0
[<ffffffff8114d986>] ? __audit_syscall_exit+0x1f6/0x2a0
[<ffffffff817a4ea9>] system_call_fastpath+0x16/0x1b
INFO: task async-enable-no:749 blocked for more than 30 seconds.
Not tainted 3.16.0-rc5+ #671
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
async-enable-no D ffff88014e254140 0 749 2 0x00000080
ffff88009de83bf0 0000000000000046 ffff88009b850000 ffff88009de83fd8
0000000000014140 0000000000014140 ffff880148305dc0 ffff880149804160
7fffffffffffffff 0000000000000002 0000000000000000 ffff88009b850000
Call Trace:
[<ffffffff817a1689>] schedule+0x29/0x70
[<ffffffff817a0b49>] schedule_timeout+0x1f9/0x270
[<ffffffff81284bfe>] ? __kernfs_create_file+0x7e/0xa0
[<ffffffff8128546b>] ? sysfs_add_file_mode_ns+0x9b/0x160
[<ffffffff817a36b2>] __down_common+0x93/0xd8
[<ffffffff817a376a>] __down_timeout+0x16/0x18
[<ffffffff8110546c>] down_timeout+0x4c/0x60
[<ffffffff81431f97>] acpi_os_wait_semaphore+0x43/0x57
[<ffffffff8145a8f4>] acpi_ut_acquire_mutex+0x48/0x88
[<ffffffff81435d1b>] ? acpi_match_device+0x4f/0x4f
[<ffffffff8145250f>] acpi_get_data_full+0x3a/0x8e
[<ffffffff81435b30>] acpi_bus_get_device+0x23/0x40
[<ffffffff8145d839>] acpi_cpu_soft_notify+0x50/0xe6
[<ffffffff810e1ddc>] notifier_call_chain+0x4c/0x70
[<ffffffff810e1eee>] __raw_notifier_call_chain+0xe/0x10
[<ffffffff810bc993>] cpu_notify+0x23/0x50
[<ffffffff810bcb98>] _cpu_up+0x168/0x180
[<ffffffff810bcc5c>] _cpu_up_with_trace+0x2c/0xe0
[<ffffffff810bd050>] ? disable_nonboot_cpus+0x1c0/0x1c0
[<ffffffff810bd06f>] async_enable_nonboot_cpus+0x1f/0x70
[<ffffffff810dda02>] kthread+0xd2/0xf0
[<ffffffff810dd930>] ? insert_kthread_work+0x40/0x40
[<ffffffff817a4dfc>] ret_from_fork+0x7c/0xb0
To avoid such deadlocks, modify acpi_os_map_cleanup() to use call_rcu()
for the unmapping of memory regions that aren't used any more.
Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
[rjw: Subject and changelog.]
Cc: All applicable <stable@...r.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
+----------------------------------------------+-----------+------------+
| | v3.17-rc2 | b11bc0be2f |
+----------------------------------------------+-----------+------------+
| boot_successes | 60 | 0 |
| boot_failures | 0 | 20 |
| inconsistent_SOFTIRQ-ON-W-IN-SOFTIRQ-R_usage | 0 | 20 |
| backtrace:pci_arch_init | 0 | 20 |
| backtrace:kernel_init_freeable | 0 | 20 |
| backtrace:smpboot_thread_fn | 0 | 18 |
| backtrace:bdi_register | 0 | 1 |
| backtrace:default_bdi_init | 0 | 1 |
| backtrace:register_sysrq_key | 0 | 1 |
| backtrace:pm_sysrq_init | 0 | 1 |
+----------------------------------------------+-----------+------------+
[ 0.079000] 3.17.0-rc2-00001-gb11bc0b #7 Not tainted
[ 0.079000] ---------------------------------
[ 0.079000] ---------------------------------
[ 0.079000] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-R} usage.
[ 0.079000] inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-R} usage.
[ 0.079000] ksoftirqd/0/3 [HC0[0]:SC1[3]:HE1:SE0] takes:
[ 0.079000] ksoftirqd/0/3 [HC0[0]:SC1[3]:HE1:SE0] takes:
[ 0.079000] (
[ 0.079000] (resource_lockresource_lock){+++?..}){+++?..}, at: , at: [<ffffffff810c2ed3>] find_next_iomem_res+0x43/0x130
[<ffffffff810c2ed3>] find_next_iomem_res+0x43/0x130
[ 0.079000] {SOFTIRQ-ON-W} state was registered at:
[ 0.079000] {SOFTIRQ-ON-W} state was registered at:
[ 0.079000]
[ 0.079000] [<ffffffff810ee014>] __lock_acquire+0x584/0x20d0
[<ffffffff810ee014>] __lock_acquire+0x584/0x20d0
[ 0.079000]
[ 0.079000] [<ffffffff810f04f6>] lock_acquire+0x86/0xe0
[<ffffffff810f04f6>] lock_acquire+0x86/0xe0
[ 0.079000]
[ 0.079000] [<ffffffff81997e78>] _raw_write_lock+0x38/0x70
[<ffffffff81997e78>] _raw_write_lock+0x38/0x70
[ 0.079000]
[ 0.079000] [<ffffffff810c3c9d>] __request_region+0xad/0x170
[<ffffffff810c3c9d>] __request_region+0xad/0x170
[ 0.079000]
[ 0.079000] [<ffffffff8235cee4>] pci_direct_probe+0x36/0x20f
[<ffffffff8235cee4>] pci_direct_probe+0x36/0x20f
[ 0.079000]
[ 0.079000] [<ffffffff8235cd65>] pci_arch_init+0xa/0x5a
[<ffffffff8235cd65>] pci_arch_init+0xa/0x5a
[ 0.079000]
[ 0.079000] [<ffffffff8232412a>] do_one_initcall+0x193/0x1a7
[<ffffffff8232412a>] do_one_initcall+0x193/0x1a7
[ 0.079000]
[ 0.079000] [<ffffffff82324238>] kernel_init_freeable+0xfa/0x17f
[<ffffffff82324238>] kernel_init_freeable+0xfa/0x17f
[ 0.079000]
[ 0.079000] [<ffffffff81979ee9>] kernel_init+0x9/0xf0
[<ffffffff81979ee9>] kernel_init+0x9/0xf0
[ 0.079000]
[ 0.079000] [<ffffffff819986ba>] ret_from_fork+0x7a/0xb0
[<ffffffff819986ba>] ret_from_fork+0x7a/0xb0
[ 0.079000] irq event stamp: 26
[ 0.079000] irq event stamp: 26
[ 0.079000] hardirqs last enabled at (26):
[ 0.079000] hardirqs last enabled at (26): [<ffffffff810fd53e>] __rcu_process_callbacks+0x6e/0x170
[<ffffffff810fd53e>] __rcu_process_callbacks+0x6e/0x170
[ 0.079000] hardirqs last disabled at (25):
[ 0.079000] hardirqs last disabled at (25): [<ffffffff810fd500>] __rcu_process_callbacks+0x30/0x170
[<ffffffff810fd500>] __rcu_process_callbacks+0x30/0x170
[ 0.079000] softirqs last enabled at (0):
[ 0.079000] softirqs last enabled at (0): [<ffffffff810bcd7a>] copy_process.part.55+0x2ca/0x18f0
[<ffffffff810bcd7a>] copy_process.part.55+0x2ca/0x18f0
[ 0.079000] softirqs last disabled at (23):
[ 0.079000] softirqs last disabled at (23): [<ffffffff810c23bd>] run_ksoftirqd+0x3d/0x70
[<ffffffff810c23bd>] run_ksoftirqd+0x3d/0x70
[ 0.079000]
[ 0.079000] other info that might help us debug this:
[ 0.079000]
[ 0.079000] other info that might help us debug this:
[ 0.079000] Possible unsafe locking scenario:
[ 0.079000]
[ 0.079000] Possible unsafe locking scenario:
[ 0.079000]
[ 0.079000] CPU0
[ 0.079000] CPU0
[ 0.079000] ----
[ 0.079000] ----
[ 0.079000] lock(
[ 0.079000] lock(resource_lockresource_lock);
);
[ 0.079000] <Interrupt>
[ 0.079000] <Interrupt>
[ 0.079000] lock(
[ 0.079000] lock(resource_lockresource_lock);
);
[ 0.079000]
[ 0.079000] *** DEADLOCK ***
[ 0.079000]
[ 0.079000]
[ 0.079000] *** DEADLOCK ***
[ 0.079000]
[ 0.079000] 1 lock held by ksoftirqd/0/3:
[ 0.079000] 1 lock held by ksoftirqd/0/3:
[ 0.079000] #0:
[ 0.079000] #0: ( (rcu_callbackrcu_callback){......}){......}, at: , at: [<ffffffff810fd594>] __rcu_process_callbacks+0xc4/0x170
[<ffffffff810fd594>] __rcu_process_callbacks+0xc4/0x170
[ 0.079000]
[ 0.079000] stack backtrace:
[ 0.079000]
[ 0.079000] stack backtrace:
[ 0.079000] CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted 3.17.0-rc2-00001-gb11bc0b #7
[ 0.079000] CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted 3.17.0-rc2-00001-gb11bc0b #7
[ 0.079000] ffffffff82b4b7b0
[ 0.079000] ffffffff82b4b7b0 ffff880000063aa0 ffff880000063aa0 ffffffff81983dbe ffffffff81983dbe ffff880000063af0 ffff880000063af0
[ 0.079000] ffffffff819822d2
[ 0.079000] ffffffff819822d2 0000000000000003 0000000000000003 ffff880000000001 ffff880000000001 ffff880000000000 ffff880000000000
[ 0.079000] 0000000000000006
[ 0.079000] 0000000000000006 ffff88000005c7a8 ffff88000005c7a8 ffffffff810ea390 ffffffff810ea390 0000000000000005 0000000000000005
[ 0.079000] Call Trace:
[ 0.079000] Call Trace:
[ 0.079000] [<ffffffff81983dbe>] dump_stack+0x19/0x1b
[ 0.079000] [<ffffffff81983dbe>] dump_stack+0x19/0x1b
[ 0.079000] [<ffffffff819822d2>] print_usage_bug.part.39+0x283/0x292
[ 0.079000] [<ffffffff819822d2>] print_usage_bug.part.39+0x283/0x292
[ 0.079000] [<ffffffff810ea390>] ? check_usage_backwards+0x150/0x150
[ 0.079000] [<ffffffff810ea390>] ? check_usage_backwards+0x150/0x150
[ 0.079000] [<ffffffff810eaf97>] mark_lock+0x267/0x6d0
[ 0.079000] [<ffffffff810eaf97>] mark_lock+0x267/0x6d0
[ 0.079000] [<ffffffff810edf12>] __lock_acquire+0x482/0x20d0
[ 0.079000] [<ffffffff810edf12>] __lock_acquire+0x482/0x20d0
[ 0.079000] [<ffffffff810049b5>] ? dump_trace+0x185/0x2f0
[ 0.079000] [<ffffffff810049b5>] ? dump_trace+0x185/0x2f0
[ 0.079000] [<ffffffff81010025>] ? save_stack_trace+0x25/0x40
[ 0.079000] [<ffffffff81010025>] ? save_stack_trace+0x25/0x40
[ 0.079000] [<ffffffff810c2aa0>] ? __request_resource+0x50/0x50
[ 0.079000] [<ffffffff810c2aa0>] ? __request_resource+0x50/0x50
[ 0.079000] [<ffffffff810f04f6>] lock_acquire+0x86/0xe0
[ 0.079000] [<ffffffff810f04f6>] lock_acquire+0x86/0xe0
[ 0.079000] [<ffffffff810c2ed3>] ? find_next_iomem_res+0x43/0x130
[ 0.079000] [<ffffffff810c2ed3>] ? find_next_iomem_res+0x43/0x130
[ 0.079000] [<ffffffff81997afb>] _raw_read_lock+0x3b/0x70
[ 0.079000] [<ffffffff81997afb>] _raw_read_lock+0x3b/0x70
[ 0.079000] [<ffffffff810c2ed3>] ? find_next_iomem_res+0x43/0x130
[ 0.079000] [<ffffffff810c2ed3>] ? find_next_iomem_res+0x43/0x130
[ 0.079000] [<ffffffff810c2ed3>] find_next_iomem_res+0x43/0x130
[ 0.079000] [<ffffffff810c2ed3>] find_next_iomem_res+0x43/0x130
[ 0.079000] [<ffffffff810c2aa0>] ? __request_resource+0x50/0x50
[ 0.079000] [<ffffffff810c2aa0>] ? __request_resource+0x50/0x50
[ 0.079000] [<ffffffff810c34ff>] walk_system_ram_range+0x7f/0xd0
[ 0.079000] [<ffffffff810c34ff>] walk_system_ram_range+0x7f/0xd0
[ 0.079000] [<ffffffff813f80a8>] ? acpi_os_execute_deferred+0x1b/0x1b
[ 0.079000] [<ffffffff813f80a8>] ? acpi_os_execute_deferred+0x1b/0x1b
[ 0.079000] [<ffffffff810c3567>] page_is_ram+0x17/0x40
[ 0.079000] [<ffffffff810c3567>] page_is_ram+0x17/0x40
[ 0.079000] [<ffffffff813f80c4>] acpi_os_map_reclaim+0x1c/0x35
[ 0.079000] [<ffffffff813f80c4>] acpi_os_map_reclaim+0x1c/0x35
[ 0.079000] [<ffffffff810fd5e7>] __rcu_process_callbacks+0x117/0x170
[ 0.079000] [<ffffffff810fd5e7>] __rcu_process_callbacks+0x117/0x170
[ 0.079000] [<ffffffff810fd594>] ? __rcu_process_callbacks+0xc4/0x170
[ 0.079000] [<ffffffff810fd594>] ? __rcu_process_callbacks+0xc4/0x170
[ 0.079000] [<ffffffff810fd650>] rcu_process_callbacks+0x10/0x20
[ 0.079000] [<ffffffff810fd650>] rcu_process_callbacks+0x10/0x20
[ 0.079000] [<ffffffff810c21f1>] __do_softirq+0x121/0x2b0
[ 0.079000] [<ffffffff810c21f1>] __do_softirq+0x121/0x2b0
[ 0.079000] [<ffffffff810c23bd>] run_ksoftirqd+0x3d/0x70
[ 0.079000] [<ffffffff810c23bd>] run_ksoftirqd+0x3d/0x70
[ 0.079000] [<ffffffff810df1e5>] smpboot_thread_fn+0xf5/0x180
[ 0.079000] [<ffffffff810df1e5>] smpboot_thread_fn+0xf5/0x180
[ 0.079000] [<ffffffff810df0f0>] ? in_egroup_p+0x40/0x40
[ 0.079000] [<ffffffff810df0f0>] ? in_egroup_p+0x40/0x40
[ 0.079000] [<ffffffff810db808>] kthread+0xf8/0x110
[ 0.079000] [<ffffffff810db808>] kthread+0xf8/0x110
[ 0.079000] [<ffffffff81993dfa>] ? wait_for_common+0x11a/0x160
[ 0.079000] [<ffffffff81993dfa>] ? wait_for_common+0x11a/0x160
[ 0.079000] [<ffffffff810e03e5>] ? finish_task_switch.constprop.50+0x45/0x100
[ 0.079000] [<ffffffff810e03e5>] ? finish_task_switch.constprop.50+0x45/0x100
[ 0.079000] [<ffffffff810db710>] ? __kthread_parkme+0x70/0x70
[ 0.079000] [<ffffffff810db710>] ? __kthread_parkme+0x70/0x70
[ 0.079000] [<ffffffff819986ba>] ret_from_fork+0x7a/0xb0
[ 0.079000] [<ffffffff819986ba>] ret_from_fork+0x7a/0xb0
[ 0.079000] [<ffffffff810db710>] ? __kthread_parkme+0x70/0x70
[ 0.079000] [<ffffffff810db710>] ? __kthread_parkme+0x70/0x70
[ 0.079372] Running resizable hashtable tests...
[ 0.079372] Running resizable hashtable tests...
[ 0.080012] Adding 2048 keys
git bisect start bf040f9c8492b6e7aaaa5bc593c7e9693a9c606a 52addcf9d6669fa439387610bc65c92fa0980cef --
git bisect bad 5cfd0a20f8c8b6f192aebd9c3f536319e106e433 # 02:06 0- 1 Merge 'stericsson/msm-cleanup' into devel-hourly-2014082622
git bisect good e39c483fdb0adda238e37d2bc80c20f7fe183600 # 02:10 20+ 0 Merge 'luto/checkpatch' into devel-hourly-2014082622
git bisect good 49c47bbe5cc0366fa83f53898cdd87d0c1c01b34 # 02:32 20+ 0 Merge 'pwm/for-next' into devel-hourly-2014082622
git bisect bad b998605a177da25ec3c5285b9cdad0cc5aaf6fa3 # 02:37 0- 20 Merge 'pm/bleeding-edge' into devel-hourly-2014082622
git bisect good 3afd0fcabfcec5e0d9164c91508eedd495674974 # 02:42 20+ 0 Merge 'm68knommu/for-next' into devel-hourly-2014082622
git bisect good 21a6f663b9172a50b0634a889501a520964b8155 # 02:47 20+ 0 Merge 'char-misc/char-misc-linus' into devel-hourly-2014082622
git bisect good ab3c20f55f3e8fc487f8db1fd83a43c429524789 # 02:51 20+ 0 Merge 'cifs/for-linus' into devel-hourly-2014082622
git bisect bad 90bf325c80978287390e17c24d84e909fc138c8c # 02:54 0- 5 Merge branches 'acpi-scan', 'acpi-osl', 'acpi-ec' and 'acpi-lpss' into bleeding-edge
git bisect good 236105db632c6279a020f78c83e22eaef746006b # 03:02 20+ 0 ACPI: Run fixed event device notifications in process context
git bisect good 558e4736f2e1b0e6323adf7a5e4df77ed6cfc1a4 # 03:04 20+ 0 ACPI / EC: Add support to disallow QR_EC to be issued before completing previous QR_EC
git bisect bad b11bc0be2f115a90949f1c26379f1288c8cde531 # 03:07 0- 20 ACPI / OSL: Make acpi_os_map_cleanup() use call_rcu() to avoid deadlocks
# first bad commit: [b11bc0be2f115a90949f1c26379f1288c8cde531] ACPI / OSL: Make acpi_os_map_cleanup() use call_rcu() to avoid deadlocks
git bisect good 52addcf9d6669fa439387610bc65c92fa0980cef # 03:09 60+ 0 Linux 3.17-rc2
git bisect bad bf040f9c8492b6e7aaaa5bc593c7e9693a9c606a # 03:09 0- 11 0day head guard for 'devel-hourly-2014082622'
git bisect good 52addcf9d6669fa439387610bc65c92fa0980cef # 03:09 60+ 0 Linux 3.17-rc2
git bisect good 1c9e4561f3b2afffcda007eae9d0ddd25525f50e # 03:17 60+ 0 Add linux-next specific files for 20140826
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
initrd=yocto-minimal-x86_64.cgz
wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd
kvm=(
qemu-system-x86_64
-enable-kvm
-cpu Haswell,+smep,+smap
-kernel $kernel
-initrd $initrd
-m 320
-smp 1
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
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