rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=13313, q=825 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10500 (4294957812-4294947312), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10500 jiffies! g13313 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:26008 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5192 [inline] __schedule+0x17e8/0x4a20 kernel/sched/core.c:6529 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_count_add+0x34/0x190 kernel/sched/core.c:5649 Code: fb 48 c7 c0 a0 38 7c 94 48 c1 e8 03 49 bf 00 00 00 00 00 fc ff df 42 0f b6 04 38 84 c0 0f 85 ed 00 00 00 83 3d bc c7 19 13 00 <75> 07 65 8b 05 1b 65 a1 7e 65 01 1d 14 65 a1 7e 48 c7 c0 a0 38 7c RSP: 0018:ffffc90000167b48 EFLAGS: 00000246 RAX: 0000000000000004 RBX: 0000000000000001 RCX: ffffffff947c3803 RDX: dffffc0000000000 RSI: ffffffff8bcac1a0 RDI: 0000000000000001 RBP: ffff888017ad0000 R08: ffffffff8fae04af R09: 1ffffffff1f5c095 R10: dffffc0000000000 R11: fffffbfff1f5c096 R12: dffffc0000000000 R13: 1ffff9200002cf74 R14: ffffffff8b93edc0 R15: dffffc0000000000 __schedule_loop kernel/sched/core.c:6605 [inline] schedule+0x144/0x320 kernel/sched/core.c:6621 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2029 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2231 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 6076 Comm: syz-executor.2 Not tainted 6.10.0-rc3-next-20240611-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 RIP: 0010:finish_task_switch+0x1ea/0x870 kernel/sched/core.c:5066 Code: c9 50 e8 69 b6 0b 00 48 83 c4 08 4c 89 f7 e8 7d 38 00 00 0f 1f 44 00 00 4c 89 f7 e8 40 ff 31 0a e8 0b 30 37 00 fb 48 8b 5d c0 <48> 8d bb f8 15 00 00 48 89 f8 48 c1 e8 03 49 be 00 00 00 00 00 fc RSP: 0018:ffffc9000ca4f7a8 EFLAGS: 00000286 RAX: dfe1fa95c0084400 RBX: ffff888022a10000 RCX: ffffffff947c3803 RDX: dffffc0000000000 RSI: ffffffff8bcac1a0 RDI: ffffffff8c200760 RBP: ffffc9000ca4f7f0 R08: ffffffff8fae04af R09: 1ffffffff1f5c095 R10: dffffc0000000000 R11: fffffbfff1f5c096 R12: 1ffff110172a7ec7 R13: dffffc0000000000 R14: ffff8880b953e8c0 R15: ffff8880b953f638 FS: 00007fb2aa9de6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b32f51000 CR3: 000000002de06000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: context_switch kernel/sched/core.c:5195 [inline] __schedule+0x17f0/0x4a20 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 futex_wait_queue+0x14e/0x1d0 kernel/futex/waitwake.c:370 __futex_wait+0x17f/0x320 kernel/futex/waitwake.c:669 futex_wait+0x101/0x360 kernel/futex/waitwake.c:697 do_futex+0x33b/0x560 kernel/futex/syscalls.c:102 __do_sys_futex kernel/futex/syscalls.c:179 [inline] __se_sys_futex+0x3f9/0x480 kernel/futex/syscalls.c:160 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb2aae7cea9 Code: 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 01 48 RSP: 002b:00007fb2aa9de178 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007fb2aafb4128 RCX: 00007fb2aae7cea9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb2aafb4128 RBP: 00007fb2aafb4120 R08: 00007fb2aa9de6c0 R09: 00007fb2aa9de6c0 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb2aafb412c R13: 000000000000006e R14: 00007ffcda2e6ae0 R15: 00007ffcda2e6bc8