rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P3676/1:b..l (detected by 0, t=10502 jiffies, g=5617, q=118) task:kworker/0:8 state:R running task stack:24632 pid: 3676 ppid: 2 flags:0x00004000 Workqueue: events_power_efficient gc_worker Call Trace: context_switch kernel/sched/core.c:5027 [inline] __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6777 irqentry_exit+0x53/0x80 kernel/entry/common.c:432 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:seqcount_lockdep_reader_access+0x1dc/0x220 include/linux/seqlock.h:106 Code: f8 4d 85 ed 75 16 e8 93 90 f0 f8 eb 15 e8 8c 90 f0 f8 e8 57 7c a3 01 4d 85 ed 74 ea e8 7d 90 f0 f8 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 66 43 c7 44 3c 09 00 00 43 c6 44 3c 0b 00 RSP: 0018:ffffc90003ab7a40 EFLAGS: 00000293 RAX: ffffffff888fd123 RBX: 0000000000000000 RCX: ffff88801fde0000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003ab7af0 R08: ffffffff888fd0f9 R09: fffffbfff1f8e22b R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: 0000000000000200 R14: 0000000000000046 R15: 1ffff92000756f48 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:338 [inline] gc_worker+0x30f/0x14b0 net/netfilter/nf_conntrack_core.c:1472 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 rcu: rcu_preempt kthread starved for 10516 jiffies! g5617 f0x0 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: 3775 Comm: syz.1.25 Not tainted 5.15.165-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline] RIP: 0010:check_preemption_disabled+0x59/0x110 lib/smp_processor_id.c:19 Code: 48 8b 04 25 28 00 00 00 48 3b 44 24 08 0f 85 c7 00 00 00 89 d8 48 83 c4 10 5b 41 5c 41 5e 41 5f c3 48 c7 04 24 00 00 00 00 9c <8f> 04 24 f7 04 24 00 02 00 00 74 c9 49 89 f6 49 89 ff 65 4c 8b 25 RSP: 0018:ffffc9000120f8b8 EFLAGS: 00000046 RAX: 0000000080000000 RBX: 0000000000000001 RCX: ffff88807e421dc0 RDX: 0000000000000000 RSI: ffffffff8a8b3820 RDI: ffffffff8ad8f7c0 RBP: 00000000ffffffff R08: ffffffff81b9bf4c R09: ffffc9000120fbb0 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000246 R13: ffff88807e421dc0 R14: 00000000ffffffff R15: ffffffff8c91fb60 FS: 00007fdd659736c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3b28d9 CR3: 000000007578b000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lockdep_recursion_inc kernel/locking/lockdep.c:431 [inline] lock_is_held_type+0x76/0x180 kernel/locking/lockdep.c:5665 lock_is_held include/linux/lockdep.h:287 [inline] ___might_sleep+0xf1/0x6a0 kernel/sched/core.c:9602 __might_fault+0x6b/0x110 mm/memory.c:5325 __copy_from_user include/linux/uaccess.h:109 [inline] check_xstate_in_sigframe arch/x86/kernel/fpu/signal.c:33 [inline] __fpu_restore_sig arch/x86/kernel/fpu/signal.c:317 [inline] fpu__restore_sig+0x1db/0x1100 arch/x86/kernel/fpu/signal.c:466 restore_sigcontext+0x638/0x710 arch/x86/kernel/signal.c:139 __do_sys_rt_sigreturn+0x190/0x250 arch/x86/kernel/signal.c:674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fdd674f6e77 Code: ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 RSP: 002b:00007fdd65973038 EFLAGS: 00000246 RAX: 0000000000000013 RBX: 00007fdd67692f80 RCX: 00007fdd674f6e79 RDX: 0000000000000001 RSI: 0000000020001340 RDI: 0000000000000004 RBP: 00007fdd6756493e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fdd67692f80 R15: 00007ffd5d8d02b8