rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=14149, q=374 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294958806-4294948304), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g14149 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:27744 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000 Call Trace: context_switch kernel/sched/core.c:5257 [inline] __schedule+0x14bc/0x5030 kernel/sched/core.c:6864 __schedule_loop kernel/sched/core.c:6946 [inline] schedule+0x165/0x360 kernel/sched/core.c:6961 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+0x599/0xb30 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 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: 6081 Comm: syz.3.20 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0033:0x7f5cfe84e817 Code: 5f c3 90 48 83 ec 18 89 fe 31 c0 bf e7 00 00 00 e8 2e 0f 14 00 c7 44 24 0c 00 00 00 00 66 0f 1f 44 00 00 8b 44 24 0c 83 c0 01 <89> 44 24 0c eb f3 0f 1f 00 55 53 48 89 fb 48 81 ec d8 00 00 00 48 RSP: 002b:00007f5cff88c580 EFLAGS: 00000282 RAX: 00000000ec9025e5 RBX: 000000000000000b RCX: ffffffffffffffa8 RDX: 00007f5cfe92b8ef RSI: 0000000000000000 RDI: 000000000000000b RBP: 00007f5cfebe5fa0 R08: 0000000000000000 R09: 000000000000000b R10: 00007f5cff88cb40 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5cfebe6038 R14: 00007ffe66fefaf0 R15: 00007ffe66fefbd8 FS: 00007f5cff88d6c0 GS: 0000000000000000