smpboot: CPU0: Intel(R) Xeon(R) CPU @ 2.00GHz (family: 0x6, model: 0x55, stepping: 0x3)
Performance Events: unsupported p6 CPU model 85 no PMU driver, software events only.
rcu: Hierarchical SRCU implementation.
dynamic_debug:dynamic_debug_init: Ignore empty _ddebug table in a CONFIG_DYNAMIC_DEBUG_CORE build
NMI watchdog: Perf NMI watchdog permanently disabled
smp: Bringing up secondary CPUs ...
x86: Booting SMP configuration:
.... node  #0, CPUs:      #1
MDS CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/mds.html for more details.
TAA CPU bug present and SMT on, data leak possible. See https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/tsx_async_abort.html for more details.
 #2
 #3
smp: Brought up 2 nodes, 4 CPUs
smpboot: Max logical packages: 2
smpboot: Total of 4 processors activated (16001.31 BogoMIPS)
devtmpfs: initialized
x86/mm: Memory block size: 128MB
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 2-... } 10886 jiffies s: 25 root: 0x4/.
rcu: blocking rcu_node structures:
Task dump for CPU 2:
swapper/0       R  running task    28272     1      0 0x00004000
Call Trace:
 sched_show_task kernel/sched/core.c:6094 [inline]
 sched_show_task.cold+0x2da/0x33e kernel/sched/core.c:6069
 synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:566 [inline]
 rcu_exp_wait_wake.cold+0x4a0/0x7ef kernel/rcu/tree_exp.h:583
 rcu_exp_sel_wait_wake kernel/rcu/tree_exp.h:617 [inline]
 synchronize_rcu_expedited+0x502/0x5f0 kernel/rcu/tree_exp.h:844
 synchronize_rcu+0xdf/0x180 kernel/rcu/tree.c:3428
 rcu_test_sync_prims kernel/rcu/update.c:233 [inline]
 rcu_set_runtime_mode+0x5/0x5a kernel/rcu/update.c:244
 do_one_initcall+0x10a/0x7b0 init/main.c:1199
 do_initcall_level init/main.c:1272 [inline]
 do_initcalls init/main.c:1288 [inline]
 do_basic_setup init/main.c:1308 [inline]
 kernel_init_freeable+0x4f4/0x5a3 init/main.c:1505
 kernel_init+0xd/0x1c0 init/main.c:1399
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 2-... } 42631 jiffies s: 25 root: 0x4/.
rcu: blocking rcu_node structures:
Task dump for CPU 2:
swapper/0       R  running task    28272     1      0 0x00004000
Call Trace:
 sched_show_task kernel/sched/core.c:6094 [inline]
 sched_show_task.cold+0x2da/0x33e kernel/sched/core.c:6069
 synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:566 [inline]
 rcu_exp_wait_wake.cold+0x4a0/0x7ef kernel/rcu/tree_exp.h:583
 rcu_exp_sel_wait_wake kernel/rcu/tree_exp.h:617 [inline]
 synchronize_rcu_expedited+0x502/0x5f0 kernel/rcu/tree_exp.h:844
 synchronize_rcu+0xdf/0x180 kernel/rcu/tree.c:3428
 rcu_test_sync_prims kernel/rcu/update.c:233 [inline]
 rcu_set_runtime_mode+0x5/0x5a kernel/rcu/update.c:244
 do_one_initcall+0x10a/0x7b0 init/main.c:1199
 do_initcall_level init/main.c:1272 [inline]
 do_initcalls init/main.c:1288 [inline]
 do_basic_setup init/main.c:1308 [inline]
 kernel_init_freeable+0x4f4/0x5a3 init/main.c:1505
 kernel_init+0xd/0x1c0 init/main.c:1399
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293