rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10505 jiffies, g=155293, q=620 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4295041521-4295031018), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10503 jiffies! g155293 f0x2 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:27496 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5510 [inline]
 __schedule+0x17d9/0x56c0 kernel/sched/core.c:7234
 __schedule_loop kernel/sched/core.c:7311 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7326
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2123
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2325
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 22961 Comm: syz.8.5202 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:hrtimer_get_expires include/linux/hrtimer.h:111 [inline]
RIP: 0010:enqueue_hrtimer+0x19d/0x2c0 kernel/time/hrtimer.c:1120
Code: 04 28 84 c0 0f 85 26 01 00 00 41 c6 46 38 01 48 8d 7b 58 4c 89 f6 e8 02 31 17 0a 89 c5 84 c0 74 41 e8 c7 2a 13 00 49 83 c6 28 <4c> 89 f0 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 f7 e8 1d b5 80 00
RSP: 0018:ffffc90000a08da0 EFLAGS: 00000086
RAX: ffffffff81b34779 RBX: ffff8880b8728400 RCX: ffff888031928000
RDX: 0000000000010000 RSI: ffff8880b8728458 RDI: ffff88807b102300
RBP: 00000000170e5001 R08: ffff88807b102317 R09: ffff88807b102308
R10: dffffc0000000000 R11: ffffed100f620463 R12: 1ffff110170e5080
R13: dffffc0000000000 R14: ffff88807b102328 R15: ffff8880b8728204
FS:  00007f2e85f9d6c0(0000) GS:ffff888125059000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6e8e38fd58 CR3: 0000000077f41000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:2048 [inline]
 __hrtimer_run_queues+0x4ce/0xa10 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x448/0x910 kernel/time/hrtimer.c:2215
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:198
Code: f7 e8 4d 6c d1 f5 f7 c3 00 02 00 00 74 05 e8 10 51 fd f5 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 54 82 c2 f5 65 8b 05 ad 12 9b 07 85 c0 74 18 5b 41 5e e9 7c e3
RSP: 0018:ffffc900048575e8 EFLAGS: 00000206
RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000080000002
RDX: 0000000000000006 RSI: ffffffff8e229c33 RDI: 0000000000000001
RBP: ffffc90004857828 R08: ffffffff90576ff7 R09: 1ffffffff20aedfe
R10: dffffc0000000000 R11: fffffbfff20aedff R12: dffffc0000000000
R13: 000000000000001f R14: ffff888021bba198 R15: ffff8880b8733980
 spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
 lruvec_unlock_irqrestore include/linux/memcontrol.h:1489 [inline]
 folio_batch_move_lru+0x80c/0xa60 mm/swap.c:206
 __folio_batch_add_and_move+0x510/0xc50 mm/swap.c:231
 shmem_alloc_and_add_folio+0xcc2/0xf60 mm/shmem.c:2008
 shmem_get_folio_gfp+0x5da/0x16d0 mm/shmem.c:2502
 shmem_get_folio mm/shmem.c:2608 [inline]
 shmem_write_begin+0x16c/0x330 mm/shmem.c:3239
 generic_perform_write+0x2d5/0x8f0 mm/filemap.c:4358
 shmem_file_write_iter+0xf8/0x120 mm/shmem.c:3414
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2e8515e68e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f2e85f9cda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2e85f9d6c0 RCX: 00007f2e8515e68e
RDX: 0000000001000000 RSI: 00007f2e7ae00000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f2e85f9cee0 R14: 00007f2e85f9cea0 R15: 00007f2e7ae00000
 </TASK>