====================================================== WARNING: possible circular locking dependency detected 6.4.0-rc2-next-20230515-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/5046 is trying to acquire lock: ffff88813fffeba0 (&pgdat->kswapd_wait){-.-.}-{2:2}, at: __wake_up_common_lock+0xb8/0x140 kernel/sched/wait.c:137 but task is already holding lock: ffff8880b992b898 (hrtimer_bases.lock){-.-.}-{2:2}, at: __run_hrtimer kernel/time/hrtimer.c:1689 [inline] ffff8880b992b898 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x23e/0xa30 kernel/time/hrtimer.c:1749 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (hrtimer_bases.lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162 lock_hrtimer_base kernel/time/hrtimer.c:173 [inline] hrtimer_start_range_ns+0xea/0xbd0 kernel/time/hrtimer.c:1296 hrtimer_start_expires include/linux/hrtimer.h:432 [inline] do_start_rt_bandwidth kernel/sched/rt.c:116 [inline] start_rt_bandwidth kernel/sched/rt.c:127 [inline] inc_rt_group kernel/sched/rt.c:1241 [inline] inc_rt_tasks kernel/sched/rt.c:1285 [inline] __enqueue_rt_entity kernel/sched/rt.c:1461 [inline] enqueue_rt_entity kernel/sched/rt.c:1510 [inline] enqueue_task_rt+0xa86/0xfc0 kernel/sched/rt.c:1545 enqueue_task kernel/sched/core.c:2082 [inline] activate_task kernel/sched/core.c:2112 [inline] ttwu_do_activate+0x20c/0xd30 kernel/sched/core.c:3735 sched_ttwu_pending+0x231/0x550 kernel/sched/core.c:3838 __flush_smp_call_function_queue+0x410/0x7b0 kernel/smp.c:526 __sysvec_call_function_single+0x99/0x2d0 arch/x86/kernel/smp.c:248 sysvec_call_function_single+0x92/0xc0 arch/x86/kernel/smp.c:243 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:653 native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline] acpi_safe_halt+0x40/0x50 drivers/acpi/processor_idle.c:112 acpi_idle_do_entry+0x53/0x70 drivers/acpi/processor_idle.c:573 acpi_idle_enter+0x173/0x290 drivers/acpi/processor_idle.c:711 cpuidle_enter_state+0xd3/0x6f0 drivers/cpuidle/cpuidle.c:267 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388 cpuidle_idle_call kernel/sched/idle.c:215 [inline] do_idle+0x2fe/0x3c0 kernel/sched/idle.c:282 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:379 start_secondary+0x221/0x2b0 arch/x86/kernel/smpboot.c:269 secondary_startup_64_no_verify+0xf4/0xfb -> #3 (&rt_b->rt_runtime_lock){-.-.}-{2:2}: __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __enable_runtime kernel/sched/rt.c:876 [inline] rq_online_rt+0xb3/0x3b0 kernel/sched/rt.c:2485 set_rq_online.part.0+0xf9/0x140 kernel/sched/core.c:9536 set_rq_online kernel/sched/core.c:9528 [inline] sched_cpu_activate+0x216/0x440 kernel/sched/core.c:9644 cpuhp_invoke_callback+0x3b5/0x9a0 kernel/cpu.c:192 cpuhp_thread_fun+0x47f/0x700 kernel/cpu.c:815 smpboot_thread_fn+0x659/0x9f0 kernel/smpboot.c:164 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 -> #2 (&rq->__lock){-.-.}-{2:2}: _raw_spin_lock_nested+0x34/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0x2f/0x120 kernel/sched/core.c:558 raw_spin_rq_lock kernel/sched/sched.h:1366 [inline] rq_lock kernel/sched/sched.h:1653 [inline] task_fork_fair+0x74/0x4f0 kernel/sched/fair.c:12097 sched_cgroup_fork+0x3d1/0x540 kernel/sched/core.c:4777 copy_process+0x4b8a/0x7600 kernel/fork.c:2614 kernel_clone+0xeb/0x890 kernel/fork.c:2914 user_mode_thread+0xb1/0xf0 kernel/fork.c:2992 rest_init+0x27/0x2b0 init/main.c:700 arch_call_rest_init+0x13/0x30 init/main.c:834 start_kernel+0x3b6/0x490 init/main.c:1088 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:556 x86_64_start_kernel+0xb3/0xc0 arch/x86/kernel/head64.c:537 secondary_startup_64_no_verify+0xf4/0xfb -> #1 (&p->pi_lock){-.-.}-{2:2}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162 try_to_wake_up+0xab/0x1a50 kernel/sched/core.c:4191 autoremove_wake_function+0x16/0x150 kernel/sched/wait.c:419 __wake_up_common+0x147/0x650 kernel/sched/wait.c:107 __wake_up_common_lock+0xd4/0x140 kernel/sched/wait.c:138 wakeup_kswapd+0x3fe/0x5c0 mm/vmscan.c:7798 rmqueue mm/page_alloc.c:3094 [inline] get_page_from_freelist+0x702/0x2a80 mm/page_alloc.c:3536 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4805 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 __get_free_pages+0xc/0x40 mm/page_alloc.c:4855 io_allocate_scq_urings io_uring/io_uring.c:3685 [inline] io_uring_create io_uring/io_uring.c:3878 [inline] io_uring_setup+0x11de/0x22c0 io_uring/io_uring.c:3975 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&pgdat->kswapd_wait){-.-.}-{2:2}: check_prev_add kernel/locking/lockdep.c:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088 lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5705 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162 __wake_up_common_lock+0xb8/0x140 kernel/sched/wait.c:137 wakeup_kswapd+0x3fe/0x5c0 mm/vmscan.c:7798 rmqueue mm/page_alloc.c:3094 [inline] get_page_from_freelist+0x702/0x2a80 mm/page_alloc.c:3536 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4805 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x28e/0x380 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3192 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3291 __slab_alloc_node mm/slub.c:3344 [inline] slab_alloc_node mm/slub.c:3441 [inline] slab_alloc mm/slub.c:3459 [inline] __kmem_cache_alloc_lru mm/slub.c:3466 [inline] kmem_cache_alloc+0x38e/0x3b0 mm/slub.c:3475 kmem_cache_zalloc include/linux/slab.h:670 [inline] fill_pool+0x264/0x5c0 lib/debugobjects.c:168 debug_objects_fill_pool lib/debugobjects.c:606 [inline] debug_object_activate+0x12d/0x4f0 lib/debugobjects.c:704 debug_hrtimer_activate kernel/time/hrtimer.c:420 [inline] debug_activate kernel/time/hrtimer.c:475 [inline] enqueue_hrtimer+0x27/0x320 kernel/time/hrtimer.c:1084 __run_hrtimer kernel/time/hrtimer.c:1702 [inline] __hrtimer_run_queues+0x8d9/0xa30 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x320/0x7b0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x14a/0x430 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x92/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 lock_release+0x3f4/0x670 kernel/locking/lockdep.c:5713 rcu_lock_release include/linux/rcupdate.h:307 [inline] rcu_read_unlock include/linux/rcupdate.h:781 [inline] page_ext_put+0x4d/0xd0 mm/page_ext.c:192 page_table_check_set mm/page_table_check.c:195 [inline] __page_table_check_pte_set+0x2ad/0x310 mm/page_table_check.c:195 page_table_check_pte_set include/linux/page_table_check.h:83 [inline] set_pte_at arch/x86/include/asm/pgtable.h:1025 [inline] copy_present_pte mm/memory.c:974 [inline] copy_pte_range mm/memory.c:1064 [inline] copy_pmd_range mm/memory.c:1150 [inline] copy_pud_range mm/memory.c:1187 [inline] copy_p4d_range mm/memory.c:1211 [inline] copy_page_range+0x199f/0x3830 mm/memory.c:1309 dup_mmap+0x10b4/0x19a0 kernel/fork.c:756 dup_mm kernel/fork.c:1688 [inline] copy_mm kernel/fork.c:1737 [inline] copy_process+0x65ae/0x7600 kernel/fork.c:2503 kernel_clone+0xeb/0x890 kernel/fork.c:2914 __do_sys_clone+0xba/0x100 kernel/fork.c:3057 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: &pgdat->kswapd_wait --> &rt_b->rt_runtime_lock --> hrtimer_bases.lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(hrtimer_bases.lock); lock(&rt_b->rt_runtime_lock); lock(hrtimer_bases.lock); lock(&pgdat->kswapd_wait); *** DEADLOCK *** 7 locks held by syz-executor.0/5046: #0: ffffffff8c8892b0 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mmap+0xea/0x19a0 kernel/fork.c:655 #1: ffff88802b99ae68 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:110 [inline] #1: ffff88802b99ae68 (&mm->mmap_lock){++++}-{3:3}, at: dup_mmap+0x108/0x19a0 kernel/fork.c:656 #2: ffff88815eb20168 (&mm->mmap_lock/1){+.+.}-{3:3}, at: mmap_write_lock_nested include/linux/mmap_lock.h:101 [inline] #2: ffff88815eb20168 (&mm->mmap_lock/1){+.+.}-{3:3}, at: dup_mmap+0x159/0x19a0 kernel/fork.c:665 #3: ffff888021fae738 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline] #3: ffff888021fae738 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: copy_pte_range mm/memory.c:1015 [inline] #3: ffff888021fae738 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: copy_pmd_range mm/memory.c:1150 [inline] #3: ffff888021fae738 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: copy_pud_range mm/memory.c:1187 [inline] #3: ffff888021fae738 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: copy_p4d_range mm/memory.c:1211 [inline] #3: ffff888021fae738 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: copy_page_range+0xc9a/0x3830 mm/memory.c:1309 #4: ffff8880281c1738 (ptlock_ptr(page)#2/1){+.+.}-{2:2}, at: copy_pte_range mm/memory.c:1022 [inline] #4: ffff8880281c1738 (ptlock_ptr(page)#2/1){+.+.}-{2:2}, at: copy_pmd_range mm/memory.c:1150 [inline] #4: ffff8880281c1738 (ptlock_ptr(page)#2/1){+.+.}-{2:2}, at: copy_pud_range mm/memory.c:1187 [inline] #4: ffff8880281c1738 (ptlock_ptr(page)#2/1){+.+.}-{2:2}, at: copy_p4d_range mm/memory.c:1211 [inline] #4: ffff8880281c1738 (ptlock_ptr(page)#2/1){+.+.}-{2:2}, at: copy_page_range+0xd6d/0x3830 mm/memory.c:1309 #5: ffff8880b992b898 (hrtimer_bases.lock){-.-.}-{2:2}, at: __run_hrtimer kernel/time/hrtimer.c:1689 [inline] #5: ffff8880b992b898 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x23e/0xa30 kernel/time/hrtimer.c:1749 #6: ffffffff8d105400 (fill_pool_map-wait-type-override){+.+.}-{3:3}, at: debug_object_activate+0xf7/0x4f0 lib/debugobjects.c:754 stack backtrace: CPU: 1 PID: 5046 Comm: syz-executor.0 Not tainted 6.4.0-rc2-next-20230515-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2188 check_prev_add kernel/locking/lockdep.c:3113 [inline] check_prevs_add kernel/locking/lockdep.c:3232 [inline] validate_chain kernel/locking/lockdep.c:3847 [inline] __lock_acquire+0x2fcd/0x5f30 kernel/locking/lockdep.c:5088 lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5705 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3d/0x60 kernel/locking/spinlock.c:162 __wake_up_common_lock+0xb8/0x140 kernel/sched/wait.c:137 wakeup_kswapd+0x3fe/0x5c0 mm/vmscan.c:7798 rmqueue mm/page_alloc.c:3094 [inline] get_page_from_freelist+0x702/0x2a80 mm/page_alloc.c:3536 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4805 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x28e/0x380 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3192 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3291 __slab_alloc_node mm/slub.c:3344 [inline] slab_alloc_node mm/slub.c:3441 [inline] slab_alloc mm/slub.c:3459 [inline] __kmem_cache_alloc_lru mm/slub.c:3466 [inline] kmem_cache_alloc+0x38e/0x3b0 mm/slub.c:3475 kmem_cache_zalloc include/linux/slab.h:670 [inline] fill_pool+0x264/0x5c0 lib/debugobjects.c:168 debug_objects_fill_pool lib/debugobjects.c:606 [inline] debug_object_activate+0x12d/0x4f0 lib/debugobjects.c:704 debug_hrtimer_activate kernel/time/hrtimer.c:420 [inline] debug_activate kernel/time/hrtimer.c:475 [inline] enqueue_hrtimer+0x27/0x320 kernel/time/hrtimer.c:1084 __run_hrtimer kernel/time/hrtimer.c:1702 [inline] __hrtimer_run_queues+0x8d9/0xa30 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x320/0x7b0 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x14a/0x430 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x92/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:lock_release+0x3f4/0x670 kernel/locking/lockdep.c:5713 Code: 7e 83 f8 01 0f 85 40 01 00 00 9c 58 f6 c4 02 0f 85 2b 01 00 00 48 f7 04 24 00 02 00 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c5 48 c7 45 00 00 00 00 00 c7 45 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc9000458f5e8 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 6fd155f09315baf1 RCX: ffffc9000458f638 RDX: 1ffff1100554150f RSI: 0000000000000002 RDI: 0000000000000000 RBP: 1ffff920008b1ebf R08: 0000000000000001 R09: fffffbfff1cf5eda R10: ffffffff8e7af6d7 R11: 0000000000094001 R12: 0000000000000005 R13: ffff88802aa0a880 R14: 0000000000000006 R15: ffff88802aa09dc0 rcu_lock_release include/linux/rcupdate.h:307 [inline] rcu_read_unlock include/linux/rcupdate.h:781 [inline] page_ext_put+0x4d/0xd0 mm/page_ext.c:192 page_table_check_set mm/page_table_check.c:195 [inline] __page_table_check_pte_set+0x2ad/0x310 mm/page_table_check.c:195 page_table_check_pte_set include/linux/page_table_check.h:83 [inline] set_pte_at arch/x86/include/asm/pgtable.h:1025 [inline] copy_present_pte mm/memory.c:974 [inline] copy_pte_range mm/memory.c:1064 [inline] copy_pmd_range mm/memory.c:1150 [inline] copy_pud_range mm/memory.c:1187 [inline] copy_p4d_range mm/memory.c:1211 [inline] copy_page_range+0x199f/0x3830 mm/memory.c:1309 dup_mmap+0x10b4/0x19a0 kernel/fork.c:756 dup_mm kernel/fork.c:1688 [inline] copy_mm kernel/fork.c:1737 [inline] copy_process+0x65ae/0x7600 kernel/fork.c:2503 kernel_clone+0xeb/0x890 kernel/fork.c:2914 __do_sys_clone+0xba/0x100 kernel/fork.c:3057 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f94ea089e9b Code: ed 0f 85 60 01 00 00 64 4c 8b 0c 25 10 00 00 00 45 31 c0 4d 8d 91 d0 02 00 00 31 d2 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 89 00 00 00 41 89 c5 85 c0 0f 85 90 00 00 RSP: 002b:00007ffc7705dff0 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f94ea089e9b RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 000055555636d400 R10: 000055555636d6d0 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffc7705e0d0 ---------------- Code disassembly (best guess): 0: 7e 83 jle 0xffffff85 2: f8 clc 3: 01 0f add %ecx,(%rdi) 5: 85 40 01 test %eax,0x1(%rax) 8: 00 00 add %al,(%rax) a: 9c pushfq b: 58 pop %rax c: f6 c4 02 test $0x2,%ah f: 0f 85 2b 01 00 00 jne 0x140 15: 48 f7 04 24 00 02 00 testq $0x200,(%rsp) 1c: 00 1d: 74 01 je 0x20 1f: fb sti 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 48 01 c5 add %rax,%rbp <-- trapping instruction 2d: 48 c7 45 00 00 00 00 movq $0x0,0x0(%rbp) 34: 00 35: c7 45 08 00 00 00 00 movl $0x0,0x8(%rbp) 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 84 .byte 0x84 3f: 24 .byte 0x24