rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P23896/1:b..l rcu: (detected by 1, t=10502 jiffies, g=180465, q=253 ncpus=2) task:syz-executor.3 state:R running task stack:24520 pid:23896 ppid:1 flags:0x00000004 Call Trace: <TASK> context_switch kernel/sched/core.c:5307 [inline] __schedule+0xc91/0x5770 kernel/sched/core.c:6625 preempt_schedule_irq+0x52/0x90 kernel/sched/core.c:6937 irqentry_exit+0x35/0x80 kernel/entry/common.c:433 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:802 [inline] RIP: 0010:percpu_ref_get_many include/linux/percpu-refcount.h:209 [inline] RIP: 0010:percpu_ref_get include/linux/percpu-refcount.h:222 [inline] RIP: 0010:obj_cgroup_get include/linux/memcontrol.h:790 [inline] RIP: 0010:memcg_slab_post_alloc_hook+0x170/0x390 mm/slab.h:553 Code: 48 c7 c7 c0 55 79 8c e8 ce 6b 91 ff e8 59 ab 2c 08 5a 85 c0 0f 85 3e 01 00 00 49 8b 04 24 a8 03 0f 85 cd 01 00 00 65 48 ff 00 <e8> 3b ab 2c 08 85 c0 0f 85 d6 00 00 00 e8 1e c8 99 ff 48 c7 c6 0d RSP: 0018:ffffc900034dfa38 EFLAGS: 00000286 RAX: 0000607f464100f0 RBX: 0000000000000005 RCX: 58cce5e7c8d5ebdc RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff8c1009c8 RBP: ffff88801244f3c0 R08: 0000000000000000 R09: ffffffff914d2b87 R10: fffffbfff229a570 R11: 0000000000000000 R12: ffff88807f3d8880 R13: 0000000000000000 R14: ffffc900034dfa98 R15: ffffea0001ecd400 slab_post_alloc_hook mm/slab.h:777 [inline] slab_alloc_node mm/slub.c:3452 [inline] __kmem_cache_alloc_node+0x1b0/0x320 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:966 [inline] __kmalloc_node+0x51/0x1a0 mm/slab_common.c:974 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:603 kvmalloc include/linux/slab.h:737 [inline] xt_alloc_table_info+0x40/0xa0 net/netfilter/x_tables.c:1192 do_replace net/ipv6/netfilter/ip6_tables.c:1141 [inline] do_ip6t_set_ctl+0x514/0xb30 net/ipv6/netfilter/ip6_tables.c:1638 nf_setsockopt+0x87/0xe0 net/netfilter/nf_sockopt.c:101 ipv6_setsockopt+0x12b/0x190 net/ipv6/ipv6_sockglue.c:1016 tcp_setsockopt+0x9f/0x100 net/ipv4/tcp.c:3804 __sys_setsockopt+0x2c6/0x5b0 net/socket.c:2271 __do_sys_setsockopt net/socket.c:2282 [inline] __se_sys_setsockopt net/socket.c:2279 [inline] __x64_sys_setsockopt+0xbe/0x160 net/socket.c:2279 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f582e28d7ba RSP: 002b:00007f582e4cf688 EFLAGS: 00000202 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000029 RCX: 00007f582e28d7ba RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 00007f582e4cf6b0 R08: 0000000000000558 R09: fefeff646b666d60 R10: 00007f582e385940 R11: 0000000000000202 R12: 00007f582e4cf710 R13: 0000000000000003 R14: 00007f582e4cf6ac R15: 00007f582e3858e0 </TASK> rcu: rcu_preempt kthread starved for 10214 jiffies! g180465 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:28368 pid:16 ppid:2 flags:0x00004000 Call Trace: <TASK> context_switch kernel/sched/core.c:5307 [inline] __schedule+0xc91/0x5770 kernel/sched/core.c:6625 schedule+0xde/0x1a0 kernel/sched/core.c:6701 schedule_timeout+0x14e/0x2b0 kernel/time/timer.c:2167 rcu_gp_fqs_loop+0x190/0x910 kernel/rcu/tree.c:1608 rcu_gp_kthread+0x23a/0x360 kernel/rcu/tree.c:1807 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 </TASK> rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.3.0-rc7-syzkaller-00191-g622322f53c6d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline] RIP: 0010:acpi_safe_halt+0x40/0x50 drivers/acpi/processor_idle.c:113 Code: eb 03 83 e3 01 89 de 0f 1f 44 00 00 84 db 75 1b 0f 1f 44 00 00 66 90 0f 1f 44 00 00 0f 00 2d c7 a0 b1 00 0f 1f 44 00 00 fb f4 <fa> 5b c3 cc 0f 1f 00 66 0f 1f 84 00 00 00 00 00 55 48 89 fd 53 0f RSP: 0018:ffffc90000177d20 EFLAGS: 00000246 RAX: ffff8880172a1d40 RBX: 0000000000000000 RCX: ffffffff89fffc45 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888144af1864 R08: 0000000000000001 R09: ffff8880b9936cab R10: ffffed1017326d95 R11: 0000000000000000 R12: 0000000000000001 R13: ffff888144af1800 R14: ffff888144af1864 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020e2d000 CR3: 0000000044542000 CR4: 00000000003506e0 Call Trace: <TASK> acpi_idle_do_entry+0x53/0x70 drivers/acpi/processor_idle.c:573 acpi_idle_enter+0x173/0x290 drivers/acpi/processor_idle.c:711 cpuidle_enter_state+0xd3/0x6f0 drivers/cpuidle/cpuidle.c:267 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388 cpuidle_idle_call kernel/sched/idle.c:215 [inline] do_idle+0x305/0x3e0 kernel/sched/idle.c:282 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:379 start_secondary+0x221/0x2b0 arch/x86/kernel/smpboot.c:264 secondary_startup_64_no_verify+0xce/0xdb </TASK>