rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=7697, q=351) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294955141-4294944638), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10504 jiffies! g7697 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: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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4105 Comm: syz-executor.2 Not tainted 5.15.168-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:unlock_hrtimer_base kernel/time/hrtimer.c:1017 [inline] RIP: 0010:hrtimer_start_range_ns+0xaeb/0xc80 kernel/time/hrtimer.c:1304 Code: ff 89 c6 e8 f7 21 11 00 85 db 74 0f e8 8e 1e 11 00 4c 89 e7 e8 a6 01 00 00 eb 05 e8 7f 1e 11 00 48 8b 44 24 38 42 80 3c 28 00 <74> 08 48 89 ef e8 3b e8 5a 00 48 8b 5d 00 48 89 d8 48 c1 e8 03 42 RSP: 0018:ffffc90002ea7990 EFLAGS: 00000046 RAX: 1ffff1100337d194 RBX: 0000000000000001 RCX: ffff88807534bb80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888019be8ca0 R08: ffffffff81728069 R09: fffffbfff1bca3be R10: 0000000000000000 R11: dffffc0000000001 R12: ffff888019be8c70 R13: dffffc0000000000 R14: 0000000000000046 R15: ffff8880b9b2a280 FS: 00007f5652f786c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5652f77d80 CR3: 0000000063752000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: posixtimer_rearm+0x1ad/0x3f0 kernel/time/posix-timers.c:328 dequeue_signal+0x1ed/0x520 kernel/signal.c:696 get_signal+0x52e/0x14e0 kernel/signal.c:2781 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f5653bf6ae7 Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 RSP: 002b:00007f5652f78178 EFLAGS: 00000246 RAX: 00000000000000ca RBX: 00007f5653d15f88 RCX: 00007f5653bf6ae9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f5653d15f88 RBP: 00007f5653d15f80 R08: 00007f5652f786c0 R09: 00007f5652f786c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5653d15f8c R13: 000000000000000b R14: 00007ffe5ee208e0 R15: 00007ffe5ee209c8