rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-....: (1 ticks this GP) idle=6d7c/1/0x4000000000000000 softirq=19996/19996 fqs=48 rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7231/1:b..l P5216/1:b..l rcu: (detected by 0, t=10502 jiffies, g=27105, q=634 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6112 Comm: udevd Not tainted 6.11.0-rc3-syzkaller-00013-g6b0f8db921ab #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 RIP: 0010:memset+0xf/0x20 arch/x86/lib/memset_64.S:37 Code: 44 88 1f e9 7e 0e 3a 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 49 89 f9 40 88 f0 48 89 d1 aa 4c 89 c8 e9 52 0e 3a 00 0f 1f 80 00 00 00 00 90 90 90 90 90 RSP: 0018:ffffc90000a18c38 EFLAGS: 00000002 RAX: 8b85a3c8089b6b00 RBX: ffffc90000a18c90 RCX: 0000000000000002 RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffffc90000a18c8e RBP: ffffc90000a18d30 R08: ffffc90000a18c8f R09: ffffc90000a18c80 R10: dffffc0000000000 R11: fffff52000143192 R12: ffffc90000a18c80 R13: ffff88802c87f340 R14: dffffc0000000000 R15: 1ffff9200014318c FS: 0000000000000000(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f83bce6f5b0 CR3: 000000007c5f6000 CR4: 0000000000350ef0 Call Trace: debug_object_deactivate+0x9a/0x390 lib/debugobjects.c:754 debug_hrtimer_deactivate kernel/time/hrtimer.c:428 [inline] debug_deactivate+0x1b/0x220 kernel/time/hrtimer.c:484 __run_hrtimer kernel/time/hrtimer.c:1657 [inline] __hrtimer_run_queues+0x305/0xd50 kernel/time/hrtimer.c:1753 hrtimer_interrupt+0x396/0x990 kernel/time/hrtimer.c:1815 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x112/0x3f0 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:kasan_quarantine_put+0xe/0x230 mm/kasan/quarantine.c:186 Code: b9 01 00 00 00 e8 62 38 0b 00 eb cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 41 57 41 56 41 55 41 54 53 50 <49> 89 fe e8 ba e9 ff ff 48 85 c0 74 6b 48 89 c3 48 c7 04 24 00 00 RSP: 0018:ffffc90019b0f840 EFLAGS: 00000246 RAX: 0000000000000001 RBX: ffff88807ce23d90 RCX: 0000000000000000 RDX: ffff88823b648650 RSI: ffff88807ce23d90 RDI: ffff8880166fc280 RBP: 0000000000000000 R08: ffffc90019b0f5f0 R09: 0000000000000010 R10: dffffc0000000000 R11: fffffbfff202f9c6 R12: ffffea0001f388c0 R13: ffff88807ce23d90 R14: ffff8880166fc280 R15: ffffffff81e881b7 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 anon_vma_chain_free mm/rmap.c:147 [inline] unlink_anon_vmas+0x297/0x5f0 mm/rmap.c:421 free_pgtables+0x567/0x840 mm/memory.c:409 exit_mmap+0x447/0xc80 mm/mmap.c:3423 __mmput+0x115/0x390 kernel/fork.c:1345 exit_mm+0x220/0x310 kernel/exit.c:571 do_exit+0x9b2/0x27f0 kernel/exit.c:869 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 __do_sys_exit_group kernel/exit.c:1042 [inline] __se_sys_exit_group kernel/exit.c:1040 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1040 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 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: 0033:0x7f83bcd50a90 Code: Unable to access opcode bytes at 0x7f83bcd50a66. RSP: 002b:00007fff61ef8ee8 EFLAGS: 00000212 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f83bcd50a90 RDX: 00000000000000e7 RSI: 000000000000003c RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000007 R09: f5a55d85231e1d31 R10: 00000000ffffffff R11: 0000000000000212 R12: 000055814a683c10 R13: 00007fff61ef8f28 R14: 0000000000000001 R15: 000055814a66e910 task:syz-executor state:R running task stack:24272 pid:5216 tgid:5216 ppid:5211 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x1800/0x4a60 kernel/sched/core.c:6529 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6708 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6732 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] zap_pte_range mm/memory.c:1688 [inline] zap_pmd_range mm/memory.c:1736 [inline] zap_pud_range mm/memory.c:1765 [inline] zap_p4d_range mm/memory.c:1786 [inline] unmap_page_range+0x3818/0x42c0 mm/memory.c:1807 unmap_vmas+0x3cc/0x5f0 mm/memory.c:1897 exit_mmap+0x264/0xc80 mm/mmap.c:3412 __mmput+0x115/0x390 kernel/fork.c:1345 exit_mm+0x220/0x310 kernel/exit.c:571 do_exit+0x9b2/0x27f0 kernel/exit.c:869 do_group_exit+0x207/0x2c0 kernel/exit.c:1031 get_signal+0x16a1/0x1740 kernel/signal.c:2917 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6ef316fc13 RSP: 002b:00007ffc514659e8 EFLAGS: 00000202 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 0000000000001467 RCX: 00007f6ef316fc13 RDX: 0000000040000000 RSI: 00007ffc514659fc RDI: 00000000ffffffff RBP: 00007ffc514659fc R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000c R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000009 task:syz.3.402 state:R running task stack:25088 pid:7231 tgid:7228 ppid:5226 flags:0x00000002 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x1800/0x4a60 kernel/sched/core.c:6529 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6708 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6732 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] do_anonymous_page mm/memory.c:4614 [inline] do_pte_missing mm/memory.c:3945 [inline] handle_pte_fault+0x505e/0x6eb0 mm/memory.c:5522 __handle_mm_fault mm/memory.c:5665 [inline] handle_mm_fault+0x1029/0x1980 mm/memory.c:5833 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f57cde3dc06 RSP: 002b:00007f57cd9fe4a0 EFLAGS: 00010206 RAX: 000000000081d001 RBX: 00007f57cd9fe540 RCX: 0000000000000022 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00007f57cd9fe5e0 RBP: 0000000000000102 R08: 00007f57c3600000 R09: 000000000081d000 R10: 0000000000000000 R11: 00007f57cd9fe550 R12: 0000000000000001 R13: 00007f57cdffb7e0 R14: 0000000000000000 R15: 00007f57cd9fe5e0 rcu: rcu_preempt kthread starved for 1545 jiffies! g27105 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+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: CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc3-syzkaller-00013-g6b0f8db921ab #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 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 40 d7 03 00 48 f7 00 08 00 00 00 75 10 eb 07 0f 00 2d e5 d6 b3 00 f3 0f 1e fa fb f4 e9 24 00 3a 00 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 RSP: 0018:ffffffff8e607ca8 EFLAGS: 00000246 RAX: ffffffff8e694680 RBX: ffff88801be81864 RCX: 000000000013b2f1 RDX: 0000000000000001 RSI: ffff88801be81800 RDI: ffff88801be81864 RBP: 000000000003a6b8 R08: ffff8880b9237c7b R09: 1ffff11017246f8f R10: dffffc0000000000 R11: ffffffff8bb63c90 R12: ffff88801a799000 R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff8f0dcf00 FS: 0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558ce5a5c8 CR3: 0000000062314000 CR4: 0000000000350ef0 Call Trace: 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 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