rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5423/1:b..l rcu: (detected by 0, t=10502 jiffies, g=7829, q=870 ncpus=2) task:syz-executor state:R running task stack:25520 pid:5423 tgid:5423 ppid:5218 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 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:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5763 Code: 2b 00 74 08 4c 89 f7 e8 ea e0 87 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25 RSP: 0018:ffffc900044af6c0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff92000895ee4 RCX: b22f85cb98e0ff00 RDX: dffffc0000000000 RSI: ffffffff8beae6e0 RDI: ffffffff8c3fba80 RBP: ffffc900044af810 R08: ffffffff93fa6847 R09: 1ffffffff27f4d08 R10: dffffc0000000000 R11: fffffbfff27f4d09 R12: 1ffff92000895ee0 R13: dffffc0000000000 R14: ffffc900044af720 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:326 [inline] rcu_read_lock include/linux/rcupdate.h:838 [inline] percpu_ref_put_many include/linux/percpu-refcount.h:330 [inline] percpu_ref_put+0x36/0x180 include/linux/percpu-refcount.h:351 css_put include/linux/cgroup_refcnt.h:79 [inline] obj_cgroup_charge_pages+0x1a5/0x230 mm/memcontrol.c:2667 obj_cgroup_charge+0x380/0x5d0 mm/memcontrol.c:2951 __memcg_slab_post_alloc_hook+0x1b1/0x7e0 mm/memcontrol.c:3012 memcg_slab_post_alloc_hook mm/slub.c:2164 [inline] slab_post_alloc_hook mm/slub.c:4002 [inline] slab_alloc_node mm/slub.c:4041 [inline] __do_kmalloc_node mm/slub.c:4161 [inline] __kmalloc_node_noprof+0x2a5/0x440 mm/slub.c:4168 __kvmalloc_node_noprof+0x72/0x190 mm/util.c:650 simple_xattr_alloc+0x43/0xa0 fs/xattr.c:1100 shmem_initxattrs+0x24a/0x450 mm/shmem.c:3818 security_inode_init_security+0x250/0x440 security/security.c:1744 shmem_symlink+0x165/0x6c0 mm/shmem.c:3667 vfs_symlink+0x137/0x2e0 fs/namei.c:4568 do_symlinkat+0x222/0x3a0 fs/namei.c:4594 __do_sys_symlinkat fs/namei.c:4610 [inline] __se_sys_symlinkat fs/namei.c:4607 [inline] __x64_sys_symlinkat+0x95/0xb0 fs/namei.c:4607 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: 0033:0x7fedbad7c477 RSP: 002b:00007fff3d60a3a8 EFLAGS: 00000202 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fedbad7c477 RDX: 00007fedbadf0701 RSI: 00000000ffffff9c RDI: 00007fff3d60a430 RBP: 00007fff3d60a3dc R08: 0000000000000013 R09: 00007fff3d60a0f7 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000032 R13: 0000000000011d30 R14: 00000000000119d1 R15: 00007fff3d60a430 rcu: rcu_preempt kthread starved for 10256 jiffies! g7829 f0x0 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:25328 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/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:2034 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc6-syzkaller-00326-gd1f2d51b711a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 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:92 [inline] RIP: 0010:acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:112 Code: 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 c0 d6 03 00 48 f7 00 08 00 00 00 75 10 66 90 0f 00 2d b5 1e 98 00 f3 0f 1e fa fb f4 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 RSP: 0018:ffffffff8e407ca8 EFLAGS: 00000246 RAX: ffffffff8e494680 RBX: ffff88801eac7864 RCX: 0000000000085e79 RDX: 0000000000000001 RSI: ffff88801eac7800 RDI: ffff88801eac7864 RBP: 000000000003a638 R08: ffff8880b8837c7b R09: 1ffff11017106f8f R10: dffffc0000000000 R11: ffffffff8bb14cc0 R12: ffff8880213e9800 R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8eed1e00 FS: 0000000000000000(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1ef8f35f84 CR3: 00000000287a0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:702 cpuidle_enter_state+0x112/0x480 drivers/cpuidle/cpuidle.c:267 cpuidle_enter+0x5d/0xa0 drivers/cpuidle/cpuidle.c:388 call_cpuidle kernel/sched/idle.c:155 [inline] cpuidle_idle_call kernel/sched/idle.c:230 [inline] do_idle+0x375/0x5d0 kernel/sched/idle.c:326 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:424 rest_init+0x2dc/0x300 init/main.c:747 start_kernel+0x47a/0x500 init/main.c:1103 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147