rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (1 GPs behind) idle=9edc/1/0x4000000000000000 softirq=66718/66719 fqs=4 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P15827/1:b..l (detected by 1, t=10502 jiffies, g=97257, q=236 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4252 Comm: syz-executor Not tainted 6.1.124-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:match_held_lock+0x78/0xb0 kernel/locking/lockdep.c:5139 Code: c2 20 61 bd 90 48 29 d0 48 c1 f8 06 48 ba ab aa aa aa aa aa aa aa 48 0f af d0 bd 01 00 00 00 48 39 ca 74 02 31 ed 89 e8 5b 5d e8 f2 93 8e f9 31 ed 85 c0 74 f0 83 3d 2d 95 e8 03 00 75 e7 48 RSP: 0018:ffffc90000007ad8 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000006 RCX: ffffc90000007b03 RDX: ffff88802e28e418 RSI: ffffffff975afb58 RDI: ffff88802e28e510 RBP: ffffc90000007c10 R08: dffffc0000000000 R09: fffffbfff1d36176 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88802e28e510 R13: 0000000000000006 R14: 000000000000001e R15: dffffc0000000000 FS: 0000555585991500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020003c80 CR3: 000000005cc14000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: find_held_lock kernel/locking/lockdep.c:5152 [inline] __lock_release kernel/locking/lockdep.c:5337 [inline] lock_release+0x264/0xa20 kernel/locking/lockdep.c:5682 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline] _raw_spin_unlock_irqrestore+0x75/0x130 kernel/locking/spinlock.c:194 debug_object_activate+0x2f9/0x4e0 lib/debugobjects.c:716 debug_hrtimer_activate kernel/time/hrtimer.c:421 [inline] debug_activate kernel/time/hrtimer.c:476 [inline] enqueue_hrtimer+0x30/0x410 kernel/time/hrtimer.c:1085 __run_hrtimer kernel/time/hrtimer.c:1706 [inline] __hrtimer_run_queues+0x728/0xe50 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x392/0x980 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1107 [inline] __sysvec_apic_timer_interrupt+0x158/0x5b0 arch/x86/kernel/apic/apic.c:1124 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline] RIP: 0010:lock_acquire+0xf3/0x5a0 kernel/locking/lockdep.c:5633 Code: 0d 0f 86 e4 02 00 00 89 db 48 89 d8 48 c1 e8 06 48 8d 3c c5 a8 0b 9b 8e be 08 00 00 00 e8 95 91 77 00 48 0f a3 1d 85 69 30 0d <73> 0d e8 36 e5 08 00 84 c0 0f 84 b9 02 00 00 48 c7 c0 74 40 9b 8e RSP: 0018:ffffc90003dc72e0 EFLAGS: 00000257 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff816aa21b RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8e9b0ba8 RBP: ffffc90003dc7430 R08: dffffc0000000000 R09: fffffbfff1d36176 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920007b8e64 R13: dffffc0000000000 R14: 0000000000000000 R15: ffffea0001d5fe80 rcu_lock_acquire include/linux/rcupdate.h:350 [inline] rcu_read_lock include/linux/rcupdate.h:791 [inline] page_ext_get+0x39/0x2a0 mm/page_ext.c:157 page_table_check_set+0x52/0x6d0 mm/page_table_check.c:112 page_table_check_pte_set include/linux/page_table_check.h:83 [inline] set_pte_at arch/x86/include/asm/pgtable.h:1009 [inline] copy_present_pte mm/memory.c:1000 [inline] copy_pte_range mm/memory.c:1091 [inline] copy_pmd_range mm/memory.c:1177 [inline] copy_pud_range mm/memory.c:1214 [inline] copy_p4d_range mm/memory.c:1238 [inline] copy_page_range+0x2d50/0x4660 mm/memory.c:1336 dup_mmap kernel/fork.c:697 [inline] dup_mm kernel/fork.c:1541 [inline] copy_mm+0xf42/0x1990 kernel/fork.c:1590 copy_process+0x19d5/0x4060 kernel/fork.c:2266 kernel_clone+0x222/0x920 kernel/fork.c:2681 __do_sys_clone kernel/fork.c:2822 [inline] __se_sys_clone kernel/fork.c:2806 [inline] __x64_sys_clone+0x231/0x280 kernel/fork.c:2806 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f9e8317c593 Code: 1f 84 00 00 00 00 00 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffc23d2f798 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9e8317c593 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 00005555859917d0 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000008ee29 R14: 00007ffc23d2f920 R15: 00000000000002a6 task:syz.1.3196 state:R running task stack:26120 pid:15827 ppid:15026 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5241 [inline] __schedule+0x143f/0x4570 kernel/sched/core.c:6558 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6870 irqentry_exit+0x53/0x80 kernel/entry/common.c:439 asm_sysvec_reschedule_ipi+0x16/0x20 arch/x86/include/asm/idtentry.h:696 RIP: 0010:lock_acquire+0x26f/0x5a0 kernel/locking/lockdep.c:5666 Code: 2b 00 74 08 4c 89 f7 e8 9f 8e 77 00 f6 44 24 61 02 0f 85 84 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: 0000:ffffc900046d7b20 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff920008daf70 RCX: 1ffff920008daf10 RDX: dffffc0000000000 RSI: ffffffff8b0c14c0 RDI: ffffffff8b5e6840 RBP: ffffc900046d7c68 R08: dffffc0000000000 R09: fffffbfff2249c4d R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffff920008daf6c R13: dffffc0000000000 R14: ffffc900046d7b80 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:350 [inline] rcu_read_lock include/linux/rcupdate.h:791 [inline] mt_find+0x2bb/0xc60 lib/maple_tree.c:6542 find_vma+0x136/0x1b0 mm/mmap.c:1886 lock_mm_and_find_vma+0x71/0x2e0 mm/memory.c:5385 do_user_addr_fault arch/x86/mm/fault.c:1312 [inline] handle_page_fault arch/x86/mm/fault.c:1431 [inline] exc_page_fault+0x169/0x620 arch/x86/mm/fault.c:1487 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608 RIP: 0033:0x7f234dc48c46 RSP: 002b:00007f234eb764a0 EFLAGS: 00010206 RAX: 0000000000e09001 RBX: 00007f234eb76540 RCX: 0000000000000030 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f234eb765e0 RBP: 0000000000000102 R08: 00007f23435f7000 R09: 0000000000e09000 R10: 0000000000000000 R11: 00007f234eb76550 R12: 0000000000000001 R13: 00007f234de19040 R14: 0000000000000000 R15: 00007f234eb765e0 rcu: rcu_preempt kthread starved for 10494 jiffies! g97257 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:26712 pid:16 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5241 [inline] __schedule+0x143f/0x4570 kernel/sched/core.c:6558 schedule+0xbf/0x180 kernel/sched/core.c:6634 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1965 rcu_gp_fqs_loop+0x2d2/0x1150 kernel/rcu/tree.c:1706 rcu_gp_kthread+0xa3/0x3b0 kernel/rcu/tree.c:1905 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 rcu: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 6.1.124-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:424 [inline] RIP: 0010:smp_call_function_many_cond+0x1fae/0x3460 kernel/smp.c:998 Code: 2f 44 89 ee 83 e6 01 31 ff e8 0e 44 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 0a e8 99 40 0b 00 e9 1b ff ff ff f3 90 <42> 0f b6 04 2b 84 c0 75 14 41 f7 07 01 00 00 00 0f 84 fe fe ff ff RSP: 0018:ffffc900000e75a0 EFLAGS: 00000293 RAX: ffffffff817f5b89 RBX: 1ffff110171c8595 RCX: ffff888017f40000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900000e7980 R08: ffffffff817f5b52 R09: fffffbfff2249c4d R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000800000000 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8e42ca8 FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff02b03f68 CR3: 000000000d08e000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3b/0x80 kernel/smp.c:1166 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:1334 [inline] text_poke_bp_batch+0x2bb/0x940 arch/x86/kernel/alternative.c:1534 text_poke_flush arch/x86/kernel/alternative.c:1725 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1732 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x12e/0x250 kernel/jump_label.c:207 static_key_enable+0x16/0x20 kernel/jump_label.c:220 toggle_allocation_gate+0xbf/0x480 mm/kfence/core.c:804 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295