rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10502 jiffies, g=112157, q=470 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294999064-4294988562), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g112157 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
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:27528 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7326
 schedule_timeout+0x127/0x280 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x1a9/0x900 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x179/0x230 kernel/rcu/tree.c:2325
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 21984 Comm: syz.0.6485 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:preempt_count_sub+0x48/0x160 kernel/sched/core.c:6009
Code: 48 c1 e9 03 83 c0 03 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 d9 00 00 00 8b 0d e5 1e 9e 19 85 c9 75 1b 65 8b 05 0a a9 8e 12 89 c2 <81> e2 ff ff ff 7f 39 d3 7f 17 81 fb fe 00 00 00 76 6b f7 db 65 01
RSP: 0018:ffffc90000007e70 EFLAGS: 00000046
RAX: 0000000080010002 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000080010002 RSI: 0000000000000004 RDI: 0000000000000001
RBP: 0000000000000046 R08: 0000000000000000 R09: ffffed1017085080
R10: ffff8880b8428403 R11: 0000000000000000 R12: ffff88802c46e300
R13: ffffffff89c71d30 R14: ffff8880b8428540 R15: ffff8880b8428590
FS:  00007f19e5fad6c0(0000) GS:ffff888123de8000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f19e5facff8 CR3: 0000000048cf3000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
 _raw_spin_unlock_irqrestore+0x3b/0x80 kernel/locking/spinlock.c:198
 __run_hrtimer kernel/time/hrtimer.c:2028 [inline]
 __hrtimer_run_queues+0x37b/0x9c0 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2215
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x109/0x470 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:rcu_lockdep_current_cpu_online+0x13/0x150 kernel/rcu/tree.c:4066
Code: 03 f6 ff ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa b8 01 00 00 00 65 f6 05 b1 5c 75 12 f0 75 0a <8b> 15 1b 1b 34 0f 85 d2 75 05 e9 ce 6d ce 09 55 53 65 ff 05 95 5c
RSP: 0018:ffffc900073c7b38 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffc9000f7bd000
RDX: 0000000000000000 RSI: ffffffff8c401100 RDI: ffffffff8e46b920
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000005
R13: 1ffff92000e78f77 R14: ffffc900073c7c80 R15: ffff88802a9f09e8
 rcu_read_lock_held_common kernel/rcu/update.c:113 [inline]
 rcu_read_lock_any_held+0x2b/0xa0 kernel/rcu/update.c:384
 rcu_sync_is_idle include/linux/rcu_sync.h:34 [inline]
 percpu_down_read_internal include/linux/percpu-rwsem.h:64 [inline]
 percpu_down_read include/linux/percpu-rwsem.h:77 [inline]
 cpus_read_lock+0xc8/0x170 kernel/cpu.c:490
 class_cpus_read_lock_constructor include/linux/cpuhplock.h:49 [inline]
 clock_was_set+0x96/0x850 kernel/time/hrtimer.c:988
 do_adjtimex+0x302/0x370 kernel/time/timekeeping.c:3006
 do_clock_adjtime kernel/time/posix-timers.c:1169 [inline]
 __do_sys_clock_adjtime+0x177/0x290 kernel/time/posix-timers.c:1181
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f19e519de59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f19e5fad028 EFLAGS: 00000246 ORIG_RAX: 0000000000000131
RAX: ffffffffffffffda RBX: 00007f19e5426090 RCX: 00007f19e519de59
RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000000
RBP: 00007f19e5233e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f19e5426128 R14: 00007f19e5426090 R15: 00007ffc4ccedfe8
 </TASK>