rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 0, t=10502 jiffies, g=53169, q=541 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294976757-4294966255), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g53169 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:28192 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: 3303 Comm: kworker/u8:7 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026
Workqueue: iou_exit io_ring_exit_work
RIP: 0010:debug_hrtimer_deactivate kernel/time/hrtimer.c:490 [inline]
RIP: 0010:__run_hrtimer kernel/time/hrtimer.c:2000 [inline]
RIP: 0010:__hrtimer_run_queues+0x234/0xa10 kernel/time/hrtimer.c:2096
Code: 0a 89 c3 31 ff 89 c6 e8 aa 66 13 00 85 db 0f 84 69 03 00 00 e8 5d 62 13 00 eb 05 e8 56 62 13 00 48 89 ef 48 c7 c6 00 7f ef 8b <e8> 07 3b 2b 03 4c 89 f8 48 c1 e8 03 48 89 84 24 88 00 00 00 42 80
RSP: 0018:ffffc90000a08dd8 EFLAGS: 00000006
RAX: ffffffff81b30f23 RBX: 0000000000000001 RCX: ffff8880213dbe00
RDX: 0000000000010000 RSI: ffffffff8bef7f00 RDI: ffff888076df1300
RBP: ffff888076df1300 R08: ffff888076df1317 R09: ffff888076df1308
R10: dffffc0000000000 R11: ffffed100edbe263 R12: ffff8880b87281c0
R13: dffffc0000000000 R14: ffff8880b8728360 R15: ffff8880b8728350
FS:  0000000000000000(0000) GS:ffff888125054000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007feeadd333a0 CR3: 0000000057b60000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 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:__rcu_read_unlock+0x5c/0xe0 kernel/rcu/tree_plugin.h:441
Code: 84 c0 75 4f ff 0b 75 1d 4c 8d b7 c8 04 00 00 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 84 c0 75 66 41 83 3e 00 75 27 43 0f b6 04 3c <84> c0 75 41 8b 03 3d 00 00 00 40 73 0f 5b 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc9000e467390 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8880213dc2c4 RCX: 0000000000000046
RDX: 0000000000000003 RSI: ffffffff8e4b115f RDI: ffff8880213dbe00
RBP: 1ffffffff21f9901 R08: ffffc9000e4677f8 R09: ffffc9000e4674b8
R10: dffffc0000000000 R11: fffff52001c8ce99 R12: 1ffff1100427b858
R13: ffffffff8176f27f R14: ffff8880213dc2c8 R15: dffffc0000000000
 rcu_read_unlock include/linux/rcupdate.h:873 [inline]
 class_rcu_destructor include/linux/rcupdate.h:1183 [inline]
 unwind_next_frame+0x1baf/0x2550 arch/x86/kernel/unwind_orc.c:709
 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x32d/0x660 mm/slub.c:5515
 _kmalloc_noprof include/linux/slab.h:969 [inline]
 slab_free_hook mm/slub.c:2657 [inline]
 slab_free mm/slub.c:6405 [inline]
 kmem_cache_free+0x156/0x650 mm/slub.c:6532
 __io_req_caches_free+0x1be/0x270 io_uring/io_uring.c:2148
 io_req_caches_free+0x21/0x30 io_uring/io_uring.c:2160
 io_ring_exit_work+0x43e/0x9a0 io_uring/io_uring.c:2363
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 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>