rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P38/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=31689, q=241 ncpus=2)
task:khugepaged      state:R  running task     stack:27216 pid:38    tgid:38    ppid:2      task_flags:0x200040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256
 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:percpu_counter_add_batch+0x2f/0x1e0 lib/percpu_counter.c:98
Code: 41 57 41 56 41 55 41 54 53 48 83 ec 18 41 89 d4 49 89 f5 48 89 fb 49 bf 00 00 00 00 00 fc ff df e8 06 18 00 fd 48 89 5c 24 10 <4c> 8d 73 58 4c 89 f0 48 c1 e8 03 48 89 04 24 42 80 3c 38 00 74 08
RSP: 0018:ffffc90000ae7730 EFLAGS: 00000293
RAX: ffffffff84bfebaa RBX: ffff88805f8e90e8 RCX: ffff88801d28dac0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88805f8e90e8
RBP: ffffc90000ae7a70 R08: ffffffff8f7cef77 R09: 1ffffffff1ef9dee
R10: dffffc0000000000 R11: fffffbfff1ef9def R12: 0000000000000020
R13: 0000000000000001 R14: ffff88805f8e8ac0 R15: dffffc0000000000
 percpu_counter_add include/linux/percpu_counter.h:71 [inline]
 add_mm_counter include/linux/mm.h:2701 [inline]
 __collapse_huge_page_copy_succeeded mm/khugepaged.c:694 [inline]
 __collapse_huge_page_copy mm/khugepaged.c:809 [inline]
 collapse_huge_page mm/khugepaged.c:1212 [inline]
 hpage_collapse_scan_pmd+0x2660/0x3bd0 mm/khugepaged.c:1412
 khugepaged_scan_mm_slot mm/khugepaged.c:2469 [inline]
 khugepaged_do_scan mm/khugepaged.c:2553 [inline]
 khugepaged+0x98e/0x16a0 mm/khugepaged.c:2609
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: rcu_preempt kthread starved for 837 jiffies! g31689 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:26928 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5325 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929
 __schedule_loop kernel/sched/core.c:7011 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7026
 schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
 rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: 5e a3 c9 f5 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 93 91 21 00 f3 0f 1e fa fb f4 <e9> 33 a3 c9 f5 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 000002c6
RAX: f056eaea9da1fe00 RBX: ffffffff81967b47 RCX: f056eaea9da1fe00
RDX: 0000000000000001 RSI: ffffffff8d70e869 RDI: ffffffff8bbf08e0
RBP: ffffc90000197f10 R08: ffff8880b8932fdb R09: 1ffff110171265fb
R10: dffffc0000000000 R11: ffffed10171265fc R12: ffffffff8f7cef70
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff110038d8b58
FS:  0000000000000000(0000) GS:ffff888126239000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007faf86e37ff3 CR3: 000000004ea7f000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
 default_idle+0x13/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x73/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:190 [inline]
 do_idle+0x1e7/0x510 kernel/sched/idle.c:330
 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:315
 common_startup_64+0x13e/0x147
 </TASK>