rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 0, t=10502 jiffies, g=4545, q=22 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10501 (4294966999-4294956498), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g4545 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:27064 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5241 [inline] __schedule+0x132c/0x4330 kernel/sched/core.c:6554 schedule+0xbf/0x180 kernel/sched/core.c:6630 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1935 rcu_gp_fqs_loop+0x2c2/0x1010 kernel/rcu/tree.c:1661 rcu_gp_kthread+0xa3/0x3a0 kernel/rcu/tree.c:1860 kthread+0x26e/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 PID: 3589 Comm: syz-executor107 Not tainted 6.1.42-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 RIP: 0010:local_irq_disable_exit_to_user include/linux/entry-common.h:191 [inline] RIP: 0010:exit_to_user_mode_loop+0xbb/0x100 kernel/entry/common.c:181 Code: e8 3a 99 71 00 e8 45 63 ab 02 48 83 bb 68 15 00 00 00 74 0a 31 ff 4c 89 f6 e8 d1 9d 3f 00 48 c7 04 24 00 00 00 00 9c 8f 04 24 <8b> 04 24 fa a9 00 02 00 00 0f 84 4e ff ff ff e8 f1 ed 1a 00 e9 44 RSP: 0018:ffffc90003d4feb8 EFLAGS: 00000246 RAX: 99360e877bde1100 RBX: 0000000000000004 RCX: ffff88801e135940 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003d4ff48 R08: ffffffff8156a62c R09: ffffed1004f32129 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: 0000000000000000 R14: ffffc90003d4ff58 R15: ffff88801e135940 FS: 00005555574293c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002006b000 CR3: 00000000782db000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f38da382e40 Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d 8a 27 03 00 e8 05 0d fb ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48 RSP: 002b:00007ffd6d5793b8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000003 RCX: 00007f38da35ce79 RDX: 00007ffd6d5793c0 RSI: 00007ffd6d5794f0 RDI: 0000000000000021 RBP: 00000000000f4240 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000555557429370 R13: 0000000000000002 R14: 00007ffd6d5799d0 R15: 00007ffd6d5799c0