rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5826/1:b..l rcu: (detected by 0, t=10502 jiffies, g=11649, q=869 ncpus=2) task:syz.3.169 state:R running task stack:26384 pid:5826 tgid:5825 ppid:5225 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x1800/0x4a60 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:native_save_fl arch/x86/include/asm/irqflags.h:32 [inline] RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:87 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:123 [inline] RIP: 0010:lock_release+0x198/0xa30 kernel/locking/lockdep.c:5776 Code: eb 03 42 80 3c 3b 00 74 08 4c 89 f7 e8 51 db 8a 00 4c 89 6c 24 50 48 c7 84 24 b0 00 00 00 00 00 00 00 9c 8f 84 24 b0 00 00 00 <42> 80 3c 3b 00 74 08 4c 89 f7 e8 39 da 8a 00 48 8b 9c 24 b0 00 00 RSP: 0018:ffffc9000cd873a0 EFLAGS: 00000246 RAX: ffffffff935ee710 RBX: 1ffff920019b0e8a RCX: ffffffff816fe2c0 RDX: 0000000000000000 RSI: ffffffff8c6060a0 RDI: ffffffff8c606060 RBP: ffffc9000cd874d0 R08: ffffffff9017c72f R09: 1ffffffff202f8e5 R10: dffffc0000000000 R11: fffffbfff202f8e6 R12: 1ffff920019b0e80 R13: ffffffff81df4473 R14: ffffc9000cd87450 R15: dffffc0000000000 rcu_lock_release include/linux/rcupdate.h:336 [inline] rcu_read_unlock include/linux/rcupdate.h:869 [inline] pte_unmap include/linux/pgtable.h:115 [inline] follow_page_pte+0xf3f/0x1ee0 mm/gup.c:920 follow_pud_mask mm/gup.c:1006 [inline] follow_p4d_mask mm/gup.c:1023 [inline] follow_page_mask+0x739/0x2f90 mm/gup.c:1066 __get_user_pages+0x67b/0x16a0 mm/gup.c:1491 __get_user_pages_locked mm/gup.c:1760 [inline] __gup_longterm_locked+0xed7/0x17d0 mm/gup.c:2489 pin_user_pages_remote+0x132/0x1f0 mm/gup.c:3528 process_vm_rw_single_vec mm/process_vm_access.c:106 [inline] process_vm_rw_core mm/process_vm_access.c:216 [inline] process_vm_rw+0x716/0xcf0 mm/process_vm_access.c:284 __do_sys_process_vm_readv mm/process_vm_access.c:296 [inline] __se_sys_process_vm_readv mm/process_vm_access.c:292 [inline] __x64_sys_process_vm_readv+0xe0/0x100 mm/process_vm_access.c:292 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: 0033:0x7f9c1cd779f9 RSP: 002b:00007f9c1dbd4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000136 RAX: ffffffffffffffda RBX: 00007f9c1cf05f80 RCX: 00007f9c1cd779f9 RDX: 0000000000000002 RSI: 0000000020008400 RDI: 000000000000004e RBP: 00007f9c1cde58ee R08: 0000000000000286 R09: 0000000000000000 R10: 0000000020008640 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9c1cf05f80 R15: 00007ffe98ec7fa8 rcu: rcu_preempt kthread starved for 10542 jiffies! g11649 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:24912 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x1800/0x4a60 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+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/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: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.11.0-rc2-syzkaller-00111-gee9a43b7cfe2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:406 [inline] RIP: 0010:unwind_next_frame+0x1351/0x2a00 arch/x86/kernel/unwind_orc.c:585 Code: 00 00 4c 39 e5 0f 86 c0 04 00 00 49 8d 44 24 08 4c 39 f0 0f 86 05 08 00 00 48 39 e8 0f 87 fc 07 00 00 e8 e2 4c 52 00 4c 89 e7 3a 24 00 00 48 89 c3 48 8b 44 24 30 42 80 3c 28 00 48 8b 6c 24 RSP: 0018:ffffc90000a18520 EFLAGS: 00000246 RAX: ffffffff81412828 RBX: 0000000000000002 RCX: ffff888017eb8000 RDX: 0000000000000100 RSI: 0000000000000002 RDI: ffffc90000a18658 RBP: 1ffff920001430ce R08: ffffffff814127ed R09: ffffffff81412746 R10: 0000000000000003 R11: ffff888017eb8000 R12: ffffc90000a18658 R13: dffffc0000000000 R14: 1ffff920001430cd R15: 1ffff920001430cc FS: 0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f58d8c356c0 CR3: 000000002ddce000 CR4: 0000000000350ef0 Call Trace: __unwind_start+0x641/0x7c0 arch/x86/kernel/unwind_orc.c:760 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0x103/0x1b0 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kmem_cache_free+0x145/0x350 mm/slub.c:4548 skb_kfree_head net/core/skbuff.c:1082 [inline] skb_free_head net/core/skbuff.c:1096 [inline] skb_release_data+0x64d/0x880 net/core/skbuff.c:1123 skb_release_all net/core/skbuff.c:1188 [inline] __kfree_skb net/core/skbuff.c:1202 [inline] consume_skb+0xb1/0x160 net/core/skbuff.c:1426 mac80211_hwsim_beacon_tx+0x3bf/0x850 drivers/net/wireless/virtual/mac80211_hwsim.c:2315 __iterate_interfaces+0x224/0x510 net/mac80211/util.c:772 ieee80211_iterate_active_interfaces_atomic+0xd8/0x170 net/mac80211/util.c:808 mac80211_hwsim_beacon+0xd4/0x1f0 drivers/net/wireless/virtual/mac80211_hwsim.c:2345 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x59d/0xd50 kernel/time/hrtimer.c:1753 hrtimer_run_softirq+0x19a/0x2c0 kernel/time/hrtimer.c:1770 handle_softirqs+0x2c6/0x970 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 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 40 d7 03 00 48 f7 00 08 00 00 00 75 10 eb 07 0f 00 2d e5 02 b4 00 f3 0f 1e fa fb f4 e9 24 30 3a 00 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 RSP: 0018:ffffc900001a7d08 EFLAGS: 00000246 RAX: ffff888017eb8000 RBX: ffff88801be9f864 RCX: 0000000000068571 RDX: 0000000000000001 RSI: ffff88801be9f800 RDI: ffff88801be9f864 RBP: 000000000003a6b8 R08: ffff8880b9337c7b R09: 1ffff11017266f8f R10: dffffc0000000000 R11: ffffffff8bb60c90 R12: ffff88801afec800 R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8f0dcc20 acpi_idle_enter+0xe4/0x140 drivers/acpi/processor_idle.c:702 cpuidle_enter_state+0x114/0x480 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 start_secondary+0x100/0x100 arch/x86/kernel/smpboot.c:313 common_startup_64+0x13e/0x147 sched: RT throttling activated