rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	(detected by 1, t=10506 jiffies, g=59581, q=688 ncpus=2)
rcu: All QSes seen, last rcu_preempt kthread activity 10506 (4294990483-4294979977), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10506 jiffies! g59581 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:27752 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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 13385 Comm: syz.3.2528 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:rb_link_node include/linux/rbtree.h:98 [inline]
RIP: 0010:__rb_add include/linux/rbtree.h:238 [inline]
RIP: 0010:rb_add_linked include/linux/rbtree.h:281 [inline]
RIP: 0010:timerqueue_linked_add+0x242/0x2e0 lib/timerqueue.c:96
Code: e8 48 c1 e8 03 80 3c 28 00 74 08 4c 89 ef e8 05 c3 69 f6 4d 89 75 00 49 8d 7d 08 ba 10 00 00 00 31 f6 e8 d1 c4 69 f6 4c 89 f8 <48> c1 e8 03 80 3c 28 00 74 08 4c 89 ff e8 dc c2 69 f6 4d 89 2f 4c
RSP: 0018:ffffc90000007d58 EFLAGS: 00000002
RAX: ffff8880b8628358 RBX: ffff8880b8628358 RCX: 0000000000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff888050f4b318
RBP: dffffc0000000000 R08: ffff888050f4b317 R09: ffff888050f4b308
R10: dffffc0000000000 R11: ffffed100a1e9663 R12: 1ffff110170c5060
R13: ffff888050f4b300 R14: 0000000000000000 R15: ffff8880b8628358
FS:  00007fdc285f56c0(0000) GS:ffff888124f5a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3035c6 CR3: 0000000077348000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 enqueue_hrtimer+0x18e/0x2c0 kernel/time/hrtimer.c:1117
 __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:io_queue_sqe_fallback+0x16c/0x210 io_uring/io_uring.c:1668
Code: e8 49 7c ff fc 83 e5 10 75 61 e8 ff 77 ff fc 48 89 df 5b 41 5c 41 5d 41 5e 41 5f 5d e9 7d 2f ff ff e8 e8 77 ff fc 49 83 e5 f3 <49> 83 cd 04 42 80 7c 3d 00 00 74 08 4c 89 f7 e8 30 03 6d fd 4c 89
RSP: 0018:ffffc9000d4a7b20 EFLAGS: 00000206
RAX: ffffffff84c6fa58 RBX: ffff88801ee9d000 RCX: 0000000000080000
RDX: ffffc900067f3000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 1ffff11003dd3a09 R08: ffffffff90576df7 R09: 1ffffffff20aedbe
R10: dffffc0000000000 R11: fffffbfff20aedbf R12: 00000000ffffffea
R13: 0000000000000100 R14: ffff88801ee9d048 R15: dffffc0000000000
 io_submit_fail_init+0x3e4/0x5c0 io_uring/io_uring.c:1870
 io_submit_sqe io_uring/io_uring.c:-1 [inline]
 io_submit_sqes+0xe2f/0x2310 io_uring/io_uring.c:2057
 __do_sys_io_uring_enter io_uring/io_uring.c:2646 [inline]
 __se_sys_io_uring_enter+0x35b/0x1bb0 io_uring/io_uring.c:2595
 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: 0033:0x7fdc2779de59
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:00007fdc285f4f38 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 0000200000000340 RCX: 00007fdc2779de59
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000008
RBP: 00000000000004d8 R08: 0000000000000000 R09: 0000000000000008
R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000940
R13: 0000200000000948 R14: 0000000000000e26 R15: 0000000000000002
 </TASK>