rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=7577, q=245) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294955715-4294945213), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g7577 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:26816 pid: 15 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5027 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373 schedule+0x11b/0x1f0 kernel/sched/core.c:6456 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1914 rcu_gp_fqs_loop+0x2bf/0x1080 kernel/rcu/tree.c:1972 rcu_gp_kthread+0xa4/0x360 kernel/rcu/tree.c:2145 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4156 Comm: syz-executor.4 Not tainted 5.15.169-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__switch_to+0x6f/0x15c0 arch/x86/kernel/process_64.c:558 Code: 41 48 c7 44 24 68 cb ee 14 8c 48 c7 44 24 70 00 31 2c 81 48 8d 4c 24 60 48 c1 e9 03 48 b8 f1 f1 f1 f1 00 f2 f2 f2 48 89 04 19 <48> b8 f2 f2 f2 00 f2 f2 f2 00 48 89 44 19 09 48 89 44 19 11 48 89 RSP: 0018:ffffc90002fe7040 EFLAGS: 00000806 RAX: f2f2f200f1f1f1f1 RBX: dffffc0000000000 RCX: 1ffff920005fce14 RDX: 0000000000000000 RSI: ffff888024433b80 RDI: ffff888023a79dc0 RBP: ffffc90002fe7290 R08: dffffc0000000000 R09: fffffbfff1bca3be R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff11004886813 R13: dffffc0000000000 R14: ffff888024434098 R15: ffff888023a7a2d0 FS: 00007f9f9dc1f6c0(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000021000000 CR3: 000000001f9d2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: