rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 ticks this GP) idle=a98c/1/0x4000000000000000 softirq=6322/6324 fqs=5 rcu: (detected by 1, t=10502 jiffies, g=7517, q=111 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5086 Comm: syz-executor391 Not tainted 6.8.0-rc1-next-20240129-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:instrument_atomic_read include/linux/instrumented.h:68 [inline] RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] RIP: 0010:hlock_class+0x49/0x130 kernel/locking/lockdep.c:228 Code: 74 08 3c 03 0f 8e da 00 00 00 0f b7 5b 20 66 81 e3 ff 1f 0f b7 db be 08 00 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 c0 8f cf 93 e2 1c 7c 00 48 0f a3 1d 4a e2 64 12 73 13 48 69 c3 c8 00 00 00 RSP: 0018:ffffc900000079e0 EFLAGS: 00000047 RAX: 0000000000000000 RBX: 0000000000000021 RCX: 0000000000000001 RDX: 1ffff11004cc5cb3 RSI: 0000000000000008 RDI: ffffffff93cf8fc0 RBP: ffffc90000007b30 R08: 0000000000000004 R09: 0000000000000000 R10: ffffffff93cf8fc7 R11: 0000000000000004 R12: ffff88802662da00 R13: 0000000000000200 R14: 0000000000000009 R15: 1ffff92000000f44 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4112e182d0 CR3: 00000000250fc000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_lock+0xb5/0xc60 kernel/locking/lockdep.c:4656 mark_usage kernel/locking/lockdep.c:4599 [inline] __lock_acquire+0x992/0x3b30 kernel/locking/lockdep.c:5091 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 rcu_lock_acquire include/linux/rcupdate.h:298 [inline] rcu_read_lock include/linux/rcupdate.h:750 [inline] advance_sched+0x67f/0xc60 net/sched/sch_taprio.c:996 __run_hrtimer kernel/time/hrtimer.c:1689 [inline] __hrtimer_run_queues+0x20c/0xc20 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline] __sysvec_apic_timer_interrupt+0x10f/0x410 arch/x86/kernel/apic/apic.c:1082 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649 RIP: 0010:lock_acquire+0x1f2/0x540 kernel/locking/lockdep.c:5722 Code: c1 05 ba e7 96 7e 83 f8 01 0f 85 c8 02 00 00 9c 58 f6 c4 02 0f 85 b3 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc900037af6e8 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff920006f5edf RCX: 000000000de4538d RDX: 0000000000000001 RSI: ffffffff8b0cc180 RDI: ffffffff8b6edcc0 RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff279f1f8 R10: ffffffff93cf8fc7 R11: 0000000000000003 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff8d7b0920 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:298 [inline] rcu_read_lock include/linux/rcupdate.h:750 [inline] page_ext_get+0x3a/0x310 mm/page_ext.c:508 page_table_check_clear.part.0+0x36/0x7f0 mm/page_table_check.c:72 page_table_check_clear mm/page_table_check.c:68 [inline] __page_table_check_pte_clear+0x31c/0x570 mm/page_table_check.c:158 page_table_check_pte_clear include/linux/page_table_check.h:49 [inline] ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1302 [inline] zap_pte_range mm/memory.c:1456 [inline] zap_pmd_range mm/memory.c:1600 [inline] zap_pud_range mm/memory.c:1629 [inline] zap_p4d_range mm/memory.c:1650 [inline] unmap_page_range+0x199d/0x2de0 mm/memory.c:1671 unmap_single_vma+0x194/0x2b0 mm/memory.c:1717 unmap_vmas+0x22f/0x490 mm/memory.c:1761 exit_mmap+0x1c1/0xb60 mm/mmap.c:3262 __mmput+0x12a/0x4d0 kernel/fork.c:1343 mmput+0x62/0x70 kernel/fork.c:1365 exit_mm kernel/exit.c:569 [inline] do_exit+0x999/0x2ac0 kernel/exit.c:858 do_group_exit+0xd3/0x2a0 kernel/exit.c:1020 __do_sys_exit_group kernel/exit.c:1031 [inline] __se_sys_exit_group kernel/exit.c:1029 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1029 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f4112d94c69 Code: Unable to access opcode bytes at 0x7f4112d94c3f. RSP: 002b:00007ffddb1480e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4112d94c69 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007f4112e15390 R08: ffffffffffffffb8 R09: 0000000100000000 R10: 0000000100000000 R11: 0000000000000246 R12: 00007f4112e15390 R13: 0000000000000000 R14: 00007f4112e17ec0 R15: 00007f4112d65130 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 2.727 msecs rcu: rcu_preempt kthread starved for 10492 jiffies! g7517 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:28736 pid:16 tgid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0xf15/0x5ce0 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6804 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6819 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2183 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:1663 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:1862 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 145 Comm: kworker/u4:6 Not tainted 6.8.0-rc1-next-20240129-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline] RIP: 0010:smp_call_function_many_cond+0x4e7/0x1590 kernel/smp.c:855 Code: 0c 00 85 ed 74 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 8b 07 0c 00 f3 90 <41> 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 5d 0e 00 00 8b 43 08 31 RSP: 0018:ffffc90002e1f920 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b94446c0 RCX: ffffffff8180384b RDX: ffff88801cb69e00 RSI: ffffffff81803825 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000006 R12: ffffed10172888d9 R13: 0000000000000001 R14: ffff8880b94446c8 R15: ffff8880b953dcc0 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555555c4fca8 CR3: 000000000d57a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2086 [inline] text_poke_bp_batch+0x22b/0x760 arch/x86/kernel/alternative.c:2296 text_poke_flush arch/x86/kernel/alternative.c:2487 [inline] text_poke_flush arch/x86/kernel/alternative.c:2484 [inline] text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2494 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d7/0x400 kernel/jump_label.c:829 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:205 static_key_enable+0x1a/0x20 kernel/jump_label.c:218 toggle_allocation_gate mm/kfence/core.c:826 [inline] toggle_allocation_gate+0xf8/0x250 mm/kfence/core.c:818 process_one_work+0x8d5/0x16e0 kernel/workqueue.c:2636 process_scheduled_works kernel/workqueue.c:2710 [inline] worker_thread+0x8b6/0x1290 kernel/workqueue.c:2791 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242