Re: [kernel/resource] cf1e4e12c9: WARNING:possible_recursive_locking_detected

From: Alistair Popple
Date: Mon Mar 29 2021 - 03:54:48 EST

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In reply to: kernel test robot: "[kernel/resource] cf1e4e12c9: WARNING:possible_recursive_locking_detected"
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Not sure why I didn't hit this in testing but the problem is obvious: I missed
that revoke_iomem() calls devmem_is_allowed() which on x86 calls
region_intersects(). I guess I must have forgotten to do a boot test with
CONFIG_IO_STRICT_DEVMEM. Will put a fix together.

- Alistair

On Monday, 29 March 2021 4:42:30 PM AEDT kernel test robot wrote:
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-9):
>
> commit: cf1e4e12c95dec0bb945df3eb138190fc353460f ("[PATCH v2] kernel/
resource: Fix locking in request_free_mem_region")
> url: https://github.com/0day-ci/linux/commits/Alistair-Popple/kernel-resource-Fix-locking-in-request_free_mem_region/20210326-092150
> base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git
a74e6a014c9d4d4161061f770c9b4f98372ac778
>
> in testcase: boot
>
> on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
>
> caused below changes (please refer to attached dmesg/kmsg for entire log/
backtrace):
>
>
> +----------------------------------------------+------------+------------+
> | | a74e6a014c | cf1e4e12c9 |
> +----------------------------------------------+------------+------------+
> | boot_successes | 6 | 0 |
> | boot_failures | 0 | 6 |
> | WARNING:possible_recursive_locking_detected | 0 | 6 |
> | INFO:rcu_sched_self-detected_stall_on_CPU | 0 | 6 |
> | INFO:rcu_sched_detected_stalls_on_CPUs/tasks | 0 | 1 |
> | EIP:queued_read_lock_slowpath | 0 | 1 |
> +----------------------------------------------+------------+------------+
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
>
>
> [ 9.616229] WARNING: possible recursive locking detected
> [ 9.617758] 5.12.0-rc2-00297-gcf1e4e12c95d #1 Not tainted
> [ 9.617758] --------------------------------------------
> [ 9.617758] swapper/0/1 is trying to acquire lock:
> [ 9.617758] 41bb9674 (resource_lock){++++}-{2:2}, at: region_intersects
(kbuild/src/consumer/kernel/resource.c:534 kbuild/src/consumer/kernel/
resource.c:580)
> [ 9.619753]
> [ 9.619753] but task is already holding lock:
> [ 9.619753] 41bb9674 (resource_lock){++++}-{2:2}, at: __request_region
(kbuild/src/consumer/kernel/resource.c:1188 kbuild/src/consumer/kernel/
resource.c:1255)
> [ 9.621757]
> [ 9.621757] other info that might help us debug this:
> [ 9.621757] Possible unsafe locking scenario:
> [ 9.621757]
> [ 9.621757] CPU0
> [ 9.621757] ----
> [ 9.623721] lock(resource_lock);
> [ 9.623747] lock(resource_lock);
> [ 9.623747]
> [ 9.623747] *** DEADLOCK ***
> [ 9.623747]
> [ 9.623747] May be due to missing lock nesting notation
> [ 9.623747]
> [ 9.625725] 2 locks held by swapper/0/1:
> [ 9.625759] #0: 42e1f160 (&dev->mutex){....}-{3:3}, at: device_lock
(kbuild/src/consumer/include/linux/device.h:741)
> [ 9.625759] #1: 41bb9674 (resource_lock){++++}-{2:2}, at:
__request_region (kbuild/src/consumer/kernel/resource.c:1188 kbuild/src/
consumer/kernel/resource.c:1255)
> [ 9.625759]
> [ 9.625759] stack backtrace:
> [ 9.627748] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.12.0-rc2-00297-
gcf1e4e12c95d #1
> [ 9.627748] Call Trace:
> [ 9.627748] ? dump_stack (kbuild/src/consumer/lib/dump_stack.c:122)
> [ 9.627748] ? validate_chain (kbuild/src/consumer/kernel/locking/
lockdep.c:2829 kbuild/src/consumer/kernel/locking/lockdep.c:2872 kbuild/src/
consumer/kernel/locking/lockdep.c:3661)
> [ 9.629761] ? __lock_acquire (kbuild/src/consumer/kernel/locking/
lockdep.c:4900)
> [ 9.629761] ? lock_acquire (kbuild/src/consumer/kernel/locking/lockdep.c:
437 kbuild/src/consumer/kernel/locking/lockdep.c:5512 kbuild/src/consumer/
kernel/locking/lockdep.c:5475)
> [ 9.629761] ? region_intersects (kbuild/src/consumer/kernel/resource.c:
534 kbuild/src/consumer/kernel/resource.c:580)
> [ 9.629761] ? lock_acquire (kbuild/src/consumer/kernel/locking/lockdep.c:
437 kbuild/src/consumer/kernel/locking/lockdep.c:5512 kbuild/src/consumer/
kernel/locking/lockdep.c:5475)
> [ 9.629761] ? lock_is_held_type (kbuild/src/consumer/kernel/locking/
lockdep.c:5253 kbuild/src/consumer/kernel/locking/lockdep.c:5549)
> [ 9.631752] ? _raw_read_lock (kbuild/src/consumer/include/linux/
rwlock_api_smp.h:150 kbuild/src/consumer/kernel/locking/spinlock.c:223)
> [ 9.631752] ? region_intersects (kbuild/src/consumer/kernel/resource.c:
534 kbuild/src/consumer/kernel/resource.c:580)
> [ 9.631752] ? devmem_is_allowed (kbuild/src/consumer/arch/x86/mm/init.c:
823)
> [ 9.633761] ? __request_region (kbuild/src/consumer/kernel/resource.c:
1157 kbuild/src/consumer/kernel/resource.c:1232 kbuild/src/consumer/kernel/
resource.c:1255)
> [ 9.633761] ? wake_up_q (kbuild/src/consumer/kernel/sched/core.c:5542)
> [ 9.633761] ? __pci_request_region (kbuild/src/consumer/drivers/pci/
pci.c:3848 (discriminator 2))
> [ 9.633761] ? __pci_request_selected_regions (kbuild/src/consumer/
drivers/pci/pci.c:3915)
> [ 9.635756] ? pci_request_selected_regions (kbuild/src/consumer/drivers/
pci/pci.c:3938)
> [ 9.637732] ? e1000_probe (kbuild/src/consumer/drivers/net/ethernet/
intel/e1000/e1000_main.c:948)
> [ 9.637767] ? trace_hardirqs_on (kbuild/src/consumer/kernel/trace/
trace_preemptirq.c:51 (discriminator 19))
> [ 9.637767] ? __pm_runtime_resume (kbuild/src/consumer/drivers/base/
power/runtime.c:1093)
> [ 9.637767] ? e1000_io_slot_reset (kbuild/src/consumer/drivers/net/
ethernet/intel/e1000/e1000_main.c:922)
> [ 9.637767] ? pci_device_probe (kbuild/src/consumer/drivers/pci/pci-
driver.c:309 kbuild/src/consumer/drivers/pci/pci-driver.c:366 kbuild/src/
consumer/drivers/pci/pci-driver.c:391 kbuild/src/consumer/drivers/pci/pci-
driver.c:434)
> [ 9.639749] ? really_probe (kbuild/src/consumer/drivers/base/dd.c:555)
> [ 9.639749] ? driver_probe_device (kbuild/src/consumer/drivers/base/dd.c:
740)
> [ 9.639749] ? device_driver_attach (kbuild/src/consumer/drivers/base/
dd.c:1015)
> [ 9.639749] ? __driver_attach (kbuild/src/consumer/drivers/base/dd.c:
1094)
> [ 9.639749] ? bus_for_each_dev (kbuild/src/consumer/drivers/base/bus.c:
305)
> [ 9.641762] ? driver_attach (kbuild/src/consumer/drivers/base/dd.c:1109)
> [ 9.641762] ? device_driver_attach (kbuild/src/consumer/drivers/base/
dd.c:1047)
> [ 9.641762] ? bus_add_driver (kbuild/src/consumer/drivers/base/bus.c:623)
> [ 9.641762] ? driver_register (kbuild/src/consumer/drivers/base/driver.c:
171)
> [ 9.643749] ? __pci_register_driver (kbuild/src/consumer/drivers/pci/pci-
driver.c:1394)
> [ 9.643749] ? blackhole_netdev_init (kbuild/src/consumer/drivers/net/
ethernet/intel/e1000/e1000_main.c:221)
> [ 9.643749] ? e1000_init_module (kbuild/src/consumer/drivers/net/
ethernet/intel/e1000/e1000_main.c:227)
> [ 9.643749] ? blackhole_netdev_init (kbuild/src/consumer/drivers/net/
ethernet/intel/e1000/e1000_main.c:221)
> [ 9.643749] ? do_one_initcall (kbuild/src/consumer/init/main.c:1226)
> [ 9.645767] ? rcu_read_lock_sched_held (kbuild/src/consumer/include/
linux/lockdep.h:278 kbuild/src/consumer/kernel/rcu/update.c:125)
> [ 9.645767] ? trace_initcall_level (kbuild/src/consumer/include/trace/
events/initcall.h:10 kbuild/src/consumer/include/trace/events/initcall.h:10)
> [ 9.645767] ? kernel_init_freeable (kbuild/src/consumer/init/main.c:1298
kbuild/src/consumer/init/main.c:1315 kbuild/src/consumer/init/main.c:1335
kbuild/src/consumer/init/main.c:1537)
> [ 9.645767] ? kernel_init_freeable (kbuild/src/consumer/init/main.c:1298
kbuild/src/consumer/init/main.c:1315 kbuild/src/consumer/init/main.c:1335
kbuild/src/consumer/init/main.c:1537)
> [ 9.647749] ? rest_init (kbuild/src/consumer/init/main.c:1421)
> [ 9.647749] ? kernel_init (kbuild/src/consumer/init/main.c:1426)
> [ 9.647749] ? ret_from_fork (kbuild/src/consumer/arch/x86/entry/
entry_32.S:856)
> [ 13.148425] rcu-torture: rcu_torture_read_exit: End of episode
> [ 68.608707] rcu-torture: rtc: (ptrval) ver: 5 tfle: 0 rta: 6 rtaf: 0 rtf:
0 rtmbe: 0 rtmbkf: 0/0 rtbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 19364
onoff: 0/0:0/0 -1,0:-1,0 0:0 (HZ=1000) barrier: 0/0:0 read-exits: 16 nocb-
toggles: 0:0
> [ 68.611404] rcu-torture: Reader Pipe: 7767697 1 0 0 0 0 0 0 0 0 0
> [ 68.612232] rcu-torture: Reader Batch: 7767697 1 0 0 0 0 0 0 0 0 0
> [ 68.612964] rcu-torture: Free-Block Circulation: 5 4 3 2 1 0 0 0 0 0 0
> [ 113.915674] rcu: INFO: rcu_sched self-detected stall on CPU
> [ 113.915674] rcu: 1-....: (104125 ticks this GP) idle=df6/1/0x40000000
softirq=1939/1941 fqs=20299
> [ 113.915674] (t=105001 jiffies g=5985 q=37696)
> [ 113.915674] NMI backtrace for cpu 1
> [ 113.915674] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.12.0-rc2-00297-
gcf1e4e12c95d #1
> [ 113.918848] Call Trace:
> [ 113.918848] ? dump_stack (kbuild/src/consumer/lib/dump_stack.c:122)
> [ 113.918848] ? lapic_can_unplug_cpu (kbuild/src/consumer/arch/x86/kernel/
apic/vector.c:1081)
> [ 113.918848] ? nmi_cpu_backtrace (kbuild/src/consumer/include/linux/
cpumask.h:356 kbuild/src/consumer/lib/nmi_backtrace.c:107)
> [ 113.918848] ? lapic_can_unplug_cpu (kbuild/src/consumer/arch/x86/kernel/
apic/hw_nmi.c:33)
> [ 113.918848] ? nmi_trigger_cpumask_backtrace (kbuild/src/consumer/lib/
nmi_backtrace.c:64)
> [ 113.918848] ? arch_trigger_cpumask_backtrace (kbuild/src/consumer/arch/
x86/kernel/apic/hw_nmi.c:41)
> [ 113.918848] ? rcu_dump_cpu_stacks (kbuild/src/consumer/kernel/rcu/
tree_stall.h:337 (discriminator 5))
> [ 113.918848] ? rcu_sched_clock_irq (kbuild/src/consumer/kernel/rcu/
tree_stall.h:624 kbuild/src/consumer/kernel/rcu/tree_stall.h:697 kbuild/src/
consumer/kernel/rcu/tree.c:3830 kbuild/src/consumer/kernel/rcu/tree.c:2650)
> [ 113.918848] ? __raise_softirq_irqoff (kbuild/src/consumer/include/trace/
events/irq.h:156 kbuild/src/consumer/kernel/softirq.c:484)
> [ 113.918848] ? update_process_times (kbuild/src/consumer/arch/x86/include/
asm/preempt.h:27 kbuild/src/consumer/kernel/time/timer.c:1798)
> [ 113.918848] ? tick_sched_timer (kbuild/src/consumer/kernel/time/tick-
sched.c:227 kbuild/src/consumer/kernel/time/tick-sched.c:1369)
> [ 113.918848] ? __hrtimer_run_queues (kbuild/src/consumer/kernel/time/
hrtimer.c:1521 kbuild/src/consumer/kernel/time/hrtimer.c:1583)
> [ 113.918848] ? do_write_seqcount_begin_nested (kbuild/src/consumer/
include/linux/spinlock.h:354 kbuild/src/consumer/include/linux/seqlock.h:893)
> [ 113.918848] ? hrtimer_interrupt (kbuild/src/consumer/kernel/time/
hrtimer.c:1648)
> [ 113.918848] ? bigsmp_ioapic_phys_id_map (kbuild/src/consumer/arch/x86/
include/asm/apic.h:105)
> [ 113.918848] ? sysvec_call_function_single (kbuild/src/consumer/arch/x86/
kernel/apic/apic.c:1100)
> [ 113.918848] ? __sysvec_apic_timer_interrupt (kbuild/src/consumer/arch/
x86/include/asm/jump_label.h:25 kbuild/src/consumer/include/linux/
jump_label.h:200 kbuild/src/consumer/arch/x86/include/asm/trace/irq_vectors.h:
41 kbuild/src/consumer/arch/x86/kernel/apic/apic.c:1107)
> [ 113.918848] ? sysvec_apic_timer_interrupt (kbuild/src/consumer/arch/x86/
kernel/apic/apic.c:1100)
> [ 113.918848] ? handle_exception (kbuild/src/consumer/arch/x86/entry/
entry_32.S:1179)
> [ 113.918848] ? sysvec_call_function_single (kbuild/src/consumer/arch/x86/
kernel/apic/apic.c:1100)
> [ 113.918848] ? queued_read_lock_slowpath (kbuild/src/consumer/arch/x86/
include/asm/vdso/processor.h:19 kbuild/src/consumer/kernel/locking/qrwlock.c:
48)
> [ 113.918848] ? sysvec_call_function_single (kbuild/src/consumer/arch/x86/
kernel/apic/apic.c:1100)
> [ 113.918848] ? queued_read_lock_slowpath (kbuild/src/consumer/arch/x86/
include/asm/vdso/processor.h:19 kbuild/src/consumer/kernel/locking/qrwlock.c:
48)
> [ 113.918848] ? do_raw_read_lock (kbuild/src/consumer/kernel/locking/
spinlock_debug.c:159)
> [ 113.918848] ? _raw_read_lock (kbuild/src/consumer/include/linux/
rwlock_api_smp.h:150 kbuild/src/consumer/kernel/locking/spinlock.c:223)
> [ 113.918848] ? region_intersects (kbuild/src/consumer/kernel/resource.c:
534 kbuild/src/consumer/kernel/resource.c:580)
> [ 113.918848] ? devmem_is_allowed (kbuild/src/consumer/arch/x86/mm/init.c:
823)
> [ 113.918848] ? __request_region (kbuild/src/consumer/kernel/resource.c:
1157 kbuild/src/consumer/kernel/resource.c:1232 kbuild/src/consumer/kernel/
resource.c:1255)
> [ 113.918848] ? wake_up_q (kbuild/src/consumer/kernel/sched/core.c:5542)
> [ 113.918848] ? __pci_request_region (kbuild/src/consumer/drivers/pci/
pci.c:3848 (discriminator 2))
> [ 113.918848] ? __pci_request_selected_regions (kbuild/src/consumer/
drivers/pci/pci.c:3915)
> [ 113.918848] ? pci_request_selected_regions (kbuild/src/consumer/drivers/
pci/pci.c:3938)
> [ 113.918848] ? e1000_probe (kbuild/src/consumer/drivers/net/ethernet/
intel/e1000/e1000_main.c:948)
> [ 113.918848] ? trace_hardirqs_on (kbuild/src/consumer/kernel/trace/
trace_preemptirq.c:51 (discriminator 19))
> [ 113.918848] ? __pm_runtime_resume (kbuild/src/consumer/drivers/base/
power/runtime.c:1093)
> [ 113.918848] ? e1000_io_slot_reset (kbuild/src/consumer/drivers/net/
ethernet/intel/e1000/e1000_main.c:922)
> [ 113.918848] ? pci_device_probe (kbuild/src/consumer/drivers/pci/pci-
driver.c:309 kbuild/src/consumer/drivers/pci/pci-driver.c:366 kbuild/src/
consumer/drivers/pci/pci-driver.c:391 kbuild/src/consumer/drivers/pci/pci-
driver.c:434)
> [ 113.918848] ? really_probe (kbuild/src/consumer/drivers/base/dd.c:555)
> [ 113.918848] ? driver_probe_device (kbuild/src/consumer/drivers/base/dd.c:
740)
> [ 113.918848] ? device_driver_attach (kbuild/src/consumer/drivers/base/
dd.c:1015)
> [ 113.918848] ? __driver_attach (kbuild/src/consumer/drivers/base/dd.c:
1094)
> [ 113.918848] ? bus_for_each_dev (kbuild/src/consumer/drivers/base/bus.c:
305)
> [ 113.918848] ? driver_attach (kbuild/src/consumer/drivers/base/dd.c:1109)
> [ 113.918848] ? device_driver_attach (kbuild/src/consumer/drivers/base/
dd.c:1047)
> [ 113.918848] ? bus_add_driver (kbuild/src/consumer/drivers/base/bus.c:623)
> [ 113.918848] ? driver_register (kbuild/src/consumer/drivers/base/driver.c:
171)
> [ 113.918848] ? __pci_register_driver (kbuild/src/consumer/drivers/pci/pci-
driver.c:1394)
> [ 113.918848] ? blackhole_netdev_init (kbuild/src/consumer/drivers/net/
ethernet/intel/e1000/e1000_main.c:221)
> [ 113.918848] ? e1000_init_module (kbuild/src/consumer/drivers/net/
ethernet/intel/e1000/e1000_main.c:227)
> [ 113.918848] ? blackhole_netdev_init (kbuild/src/consumer/drivers/net/
ethernet/intel/e1000/e1000_main.c:221)
> [ 113.918848] ? do_one_initcall (kbuild/src/consumer/init/main.c:1226)
> [ 113.918848] ? rcu_read_lock_sched_held (kbuild/src/consumer/include/
linux/lockdep.h:278 kbuild/src/consumer/kernel/rcu/update.c:125)
> [ 113.918848] ? trace_initcall_level (kbuild/src/consumer/include/trace/
events/initcall.h:10 kbuild/src/consumer/include/trace/events/initcall.h:10)
> [ 113.918848] ? kernel_init_freeable (kbuild/src/consumer/init/main.c:1298
kbuild/src/consumer/init/main.c:1315 kbuild/src/consumer/init/main.c:1335
kbuild/src/consumer/init/main.c:1537)
> [ 113.918848] ? kernel_init_freeable (kbuild/src/consumer/init/main.c:1298
kbuild/src/consumer/init/main.c:1315 kbuild/src/consumer/init/main.c:1335
kbuild/src/consumer/init/main.c:1537)
> [ 113.918848] ? rest_init (kbuild/src/consumer/init/main.c:1421)
> [ 113.918848] ? kernel_init (kbuild/src/consumer/init/main.c:1426)
> [ 113.918848] ? ret_from_fork (kbuild/src/consumer/arch/x86/entry/
entry_32.S:856)
> [ 121.856725] rcu: INFO: rcu_sched detected expedited stalls on CPUs/tasks:
{ 1-... } 108713 jiffies s: 73 root: 0x2/.
> [ 121.858173] rcu: blocking rcu_node structures (internal RCU debug):
> [ 121.858984] Task dump for CPU 1:
> [ 121.859402] task:swapper/0 state:R running task stack: 5736
pid: 1 ppid: 0 flags:0x00004008
> [ 121.860681] Call Trace:
> [ 121.860996] ? wake_up_q (kbuild/src/consumer/kernel/sched/core.c:5542)
> [ 121.861429] ? __pci_request_region (kbuild/src/consumer/drivers/pci/
pci.c:3848 (discriminator 2))
> [ 121.861990] ? __pci_request_selected_regions (kbuild/src/consumer/
drivers/pci/pci.c:3915)
> [ 121.862639] ? pci_request_selected_regions (kbuild/src/consumer/drivers/
pci/pci.c:3938)
> [ 121.863247] ? e1000_probe (kbuild/src/consumer/drivers/net/ethernet/
intel/e1000/e1000_main.c:948)
> [ 121.863713] ? trace_hardirqs_on (kbuild/src/consumer/kernel/trace/
trace_preemptirq.c:51 (discriminator 19))
> [ 121.865689] ? __pm_runtime_resume (kbuild/src/consumer/drivers/base/
power/runtime.c:1093)
> [ 121.866262] ? e1000_io_slot_reset (kbuild/src/consumer/drivers/net/
ethernet/intel/e1000/e1000_main.c:922)
> [ 121.866807] ? pci_device_probe (kbuild/src/consumer/drivers/pci/pci-
driver.c:309 kbuild/src/consumer/drivers/pci/pci-driver.c:366 kbuild/src/
consumer/drivers/pci/pci-driver.c:391 kbuild/src/consumer/drivers/pci/pci-
driver.c:434)
> [ 121.867363] ? really_probe (kbuild/src/consumer/drivers/base/dd.c:555)
> [ 121.867875] ? driver_probe_device (kbuild/src/consumer/drivers/base/dd.c:
740)
> [ 121.869481] ? device_driver_attach (kbuild/src/consumer/drivers/base/
dd.c:1015)
> [ 121.870046] ? __driver_attach (kbuild/src/consumer/drivers/base/dd.c:
1094)
> [ 121.870576] ? bus_for_each_dev (kbuild/src/consumer/drivers/base/bus.c:
305)
> [ 121.871092] ? driver_attach (kbuild/src/consumer/drivers/base/dd.c:1109)
> [ 121.871625] ? device_driver_attach (kbuild/src/consumer/drivers/base/
dd.c:1047)
> [ 121.872227] ? bus_add_driver (kbuild/src/consumer/drivers/base/bus.c:623)
> [ 121.872739] ? driver_register (kbuild/src/consumer/drivers/base/driver.c:
171)
> [ 121.873305] ? __pci_register_driver (kbuild/src/consumer/drivers/pci/pci-
driver.c:1394)
> [ 121.873878] ? blackhole_netdev_init (kbuild/src/consumer/drivers/net/
ethernet/intel/e1000/e1000_main.c:221)
> [ 121.874466] ? e1000_init_module (kbuild/src/consumer/drivers/net/
ethernet/intel/e1000/e1000_main.c:227)
> [ 121.874996] ? blackhole_netdev_init (kbuild/src/consumer/drivers/net/
ethernet/intel/e1000/e1000_main.c:221)
> [ 121.875586] ? do_one_initcall (kbuild/src/consumer/init/main.c:1226)
> [ 121.876114] ? rcu_read_lock_sched_held (kbuild/src/consumer/include/
linux/lockdep.h:278 kbuild/src/consumer/kernel/rcu/update.c:125)
> [ 121.876757] ? trace_initcall_level (kbuild/src/consumer/include/trace/
events/initcall.h:10 kbuild/src/consumer/include/trace/events/initcall.h:10)
> [ 121.877368] ? kernel_init_freeable (kbuild/src/consumer/init/main.c:1298
kbuild/src/consumer/init/main.c:1315 kbuild/src/consumer/init/main.c:1335
kbuild/src/consumer/init/main.c:1537)
> [ 121.877940] ? kernel_init_freeable (kbuild/src/consumer/init/main.c:1298
kbuild/src/consumer/init/main.c:1315 kbuild/src/consumer/init/main.c:1335
kbuild/src/consumer/init/main.c:1537)
> [ 121.878538] ? rest_init (kbuild/src/consumer/init/main.c:1421)
> [ 121.879008] ? kernel_init (kbuild/src/consumer/init/main.c:1426)
> [ 121.879473] ? ret_from_fork (kbuild/src/consumer/arch/x86/entry/
entry_32.S:856)
> [ 130.048872] rcu-torture: rtc: (ptrval) ver: 5 tfle: 0 rta: 6 rtaf: 0 rtf:
0 rtmbe: 0 rtmbkf: 0/0 rtbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 41670
onoff: 0/0:0/0 -1,0:-1,0 0:0 (HZ=1000) barrier: 0/0:0 read-exits: 16 nocb-
toggles: 0:0
> [ 130.051537] rcu-torture: Reader Pipe: 16853873 1 0 0 0 0 0 0 0 0 0
> [ 130.052366] rcu-torture: Reader Batch: 16853873 1 0 0 0 0 0 0 0 0 0
> [ 130.053161] rcu-torture: Free-Block Circulation: 5 4 3 2 1 0 0 0 0 0 0
> [ 130.053994] ??? Writer stall state RTWS_SYNC(9) g5985 f0x0 ->state 0x2
cpu 0
> [ 130.054858] task:rcu_torture_wri state:D stack: 6900 pid: 109 ppid:
2 flags:0x00004000
> [ 130.055908] Call Trace:
> [ 130.056221] ? __schedule (kbuild/src/consumer/kernel/sched/core.c:4327
kbuild/src/consumer/kernel/sched/core.c:5075)
> [ 130.056697] ? lock_release (kbuild/src/consumer/include/trace/events/
lock.h:58 kbuild/src/consumer/kernel/locking/lockdep.c:5521)
> [ 130.057173] ? schedule (kbuild/src/consumer/arch/x86/include/asm/
preempt.h:85 (discriminator 1) kbuild/src/consumer/kernel/sched/core.c:5155
(discriminator 1))
> [ 130.057593] ? schedule_preempt_disabled (kbuild/src/consumer/arch/x86/
include/asm/preempt.h:80 kbuild/src/consumer/kernel/sched/core.c:5214)
> [ 130.058186] ? __mutex_lock (kbuild/src/consumer/kernel/locking/mutex.c:
1029 kbuild/src/consumer/kernel/locking/mutex.c:1093)
> [ 130.058667] ? mutex_lock_nested (kbuild/src/consumer/kernel/locking/
mutex.c:1109)
> [ 130.060228] ? synchronize_rcu_expedited (kbuild/src/consumer/kernel/rcu/
tree_exp.h:324 kbuild/src/consumer/kernel/rcu/tree_exp.h:836)
> [ 130.060861] ? synchronize_rcu_expedited (kbuild/src/consumer/kernel/rcu/
tree_exp.h:324 kbuild/src/consumer/kernel/rcu/tree_exp.h:836)
> [ 130.061479] ? debug_object_free (kbuild/src/consumer/lib/debugobjects.c:
853)
> [ 130.061996] ? rcu_preempt_sleep_check (kbuild/src/consumer/include/linux/
rcupdate.h:327)
> [ 130.062538] ? __might_sleep (kbuild/src/consumer/kernel/sched/core.c:8285
(discriminator 14))
> [ 130.063008] ? lock_acquire (kbuild/src/consumer/include/trace/events/
lock.h:13 kbuild/src/consumer/kernel/locking/lockdep.c:5481)
> [ 130.063460] ? synchronize_rcu (kbuild/src/consumer/kernel/rcu/tree.c:
3767)
> [ 130.063960] ? schedule_hrtimeout_range (kbuild/src/consumer/kernel/time/
hrtimer.c:2186)
> [ 130.064509] ? lock_acquired (kbuild/src/consumer/include/trace/events/
lock.h:67 kbuild/src/consumer/kernel/locking/lockdep.c:5751)
> [ 130.064986] ? __delay (kbuild/src/consumer/arch/x86/lib/delay.c:204)
> [ 130.065384] ? __const_udelay (kbuild/src/consumer/arch/x86/lib/delay.c:
218 (discriminator 21))
> [ 130.065890] ? rcu_torture_writer (kbuild/src/consumer/kernel/rcu/
rcutorture.c:1220)
> [ 130.066435] ? __kthread_parkme (kbuild/src/consumer/arch/x86/include/asm/
bitops.h:207 kbuild/src/consumer/include/asm-generic/bitops/instrumented-non-
atomic.h:135 kbuild/src/consumer/kernel/kthread.c:222)
> [ 130.066947] ? kthread (kbuild/src/consumer/kernel/kthread.c:294)
> [ 130.067352] ? rcu_torture_pipe_update (kbuild/src/consumer/kernel/rcu/
rcutorture.c:1126)
> [ 130.067945] ? __list_del_entry (kbuild/src/consumer/arch/x86/events/
intel/uncore.c:318)
> [ 130.068439] ? ret_from_fork (kbuild/src/consumer/arch/x86/entry/
entry_32.S:856)
> [ 130.068922] rcu: rcu_sched: wait state: RCU_GP_WAIT_FQS(5) ->state: 0x0
delta ->gp_activity 21 ->gp_req_activity 121169 ->gp_wake_time 121169 -
>gp_wake_seq 5984 ->gp_seq 5985 ->gp_seq_needed 5988 ->gp_flags 0x0
> [ 130.071191] rcu: rcu_node 0:1 ->gp_seq 5985 ->gp_seq_needed 5988
> [ 130.071956] rcu: cpu 0 ->gp_seq_needed 5988
> [ 130.072500] rcu: cpu 1 ->gp_seq_needed 5988
> [ 130.073046] rcu: RCU callbacks invoked since boot: 23719
> [ 130.073712] rcu_tasks: RTGS_WAIT_CBS(11) since 127497 g:2 i:0/0 k.
> [ 130.074481] rcu_tasks_rude: RTGS_WAIT_CBS(11) since 127657 g:2 i:0/3 k.
> [ 130.075385] rcu_tasks_trace: RTGS_WAIT_CBS(11) since 127828 g:2 i:0/1 k.
N0 h:0/0/0
> [ 130.078873] Dumping ftrace buffer:
> [ 130.079310] (ftrace buffer empty)
> [ 191.488693] rcu-torture: rtc: (ptrval) ver: 5 tfle: 0 rta: 6 rtaf: 0 rtf:
0 rtmbe: 0 rtmbkf: 0/0 rtbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 63533
onoff: 0/0:0/0 -1,0:-1,0 0:0 (HZ=1000) barrier: 0/0:0 read-exits: 16 nocb-
toggles: 0:0
> [ 191.491304] rcu-torture: Reader Pipe: 25714613 1 0 0 0 0 0 0 0 0 0
> [ 191.492111] rcu-torture: Reader Batch: 25714613 1 0 0 0 0 0 0 0 0 0
> [ 191.492907] rcu-torture: Free-Block Circulation: 5 4 3 2 1 0 0 0 0 0 0
> [ 191.493730] ??? Writer stall state RTWS_SYNC(9) g5985 f0x0 ->state 0x2
cpu 0
> [ 191.494579] rcu: rcu_sched: wait state: RCU_GP_WAIT_FQS(5) ->state: 0x0
delta ->gp_activity 7 ->gp_req_activity 182594 ->gp_wake_time 182594 -
>gp_wake_seq 5984 ->gp_seq 5985 ->gp_seq_needed 5988 ->gp_flags 0x0
> [ 191.496790] rcu: rcu_node 0:1 ->gp_seq 5985 ->gp_seq_needed 5988
> [ 191.497521] rcu: cpu 0 ->gp_seq_needed 5988
> [ 191.498050] rcu: cpu 1 ->gp_seq_needed 5988
> [ 191.498572] rcu: RCU callbacks invoked since boot: 23719
> [ 191.499222] rcu_tasks: RTGS_WAIT_CBS(11) since 188922 g:2 i:0/0 k.
> [ 191.499999] rcu_tasks_rude: RTGS_WAIT_CBS(11) since 189083 g:2 i:0/3 k.
> [ 191.500832] rcu_tasks_trace: RTGS_WAIT_CBS(11) since 189254 g:2 i:0/1 k.
N0 h:0/0/0
> [ 253.207367] rcu-torture: rtc: (ptrval) ver: 5 tfle: 0 rta: 6 rtaf: 0 rtf:
0 rtmbe: 0 rtmbkf: 0/0 rtbe: 0 rtbke: 0 rtbre: 0 rtbf: 0 rtb: 0 nt: 83753
onoff: 0/0:0/0 -1,0:-1,0 0:0 (HZ=1000) barrier: 0/0:0 read-exits: 16 nocb-
toggles: 0:0
> [ 253.209923] rcu-torture: Reader Pipe: 33834394 1 0 0 0 0 0 0 0 0 0
> [ 253.210714] rcu-torture: Reader Batch: 33834394 1 0 0 0 0 0 0 0 0 0
> [ 253.211498] rcu-torture: Free-Block Circulation: 5 4 3 2 1 0 0 0 0 0 0
> [ 253.212358] ??? Writer stall state RTWS_SYNC(9) g5985 f0x0 ->state 0x2
cpu 0
> [ 253.213214] rcu: rcu_sched: wait state: RCU_GP_WAIT_FQS(5) ->state: 0x0
delta ->gp_activity 6 ->gp_req_activity 244313 ->gp_wake_time 244313 -
>gp_wake_seq 5984 ->gp_seq 5985 ->gp_seq_needed 5988 ->gp_flags 0x0
> [ 253.215409] rcu: rcu_node 0:1 ->gp_seq 5985 ->gp_seq_needed 5988
> [ 253.216164] rcu: cpu 0 ->gp_seq_needed 5988
> [ 253.216695] rcu: cpu 1 ->gp_seq_needed 5988
> [ 253.217225] rcu: RCU callbacks invoked since boot: 23719
> [ 253.217885] rcu_tasks: RTGS_WAIT_CBS(11) since 250641 g:2 i:0/0 k.
> [ 253.218647] rcu_tasks_rude: RTGS_WAIT_CBS(11) since 250801 g:2 i:0/3 k.
> [ 253.219473] rcu_tasks_trace: RTGS_WAIT_CBS(11) since 250972 g:2 i:0/1 k.
N0 h:0/0/0
>
>
> To reproduce:
>
> # build kernel
> cd linux
> cp config-5.12.0-rc2-00297-gcf1e4e12c95d .config
> make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare
modules_prepare bzImage
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> job-script # job-script is attached in
this email
>
>
>
> ---
> 0DAY/LKP+ Test Infrastructure Open Source Technology
Center
> https://lists.01.org/hyperkitty/list/lkp@xxxxxxxxxxxx Intel
Corporation
>
> Thanks,
> Oliver Sang
>

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