======================================================
WARNING: possible circular locking dependency detected
6.4.0-rc1-syzkaller #0 Not tainted
------------------------------------------------------
udevd/4631 is trying to acquire lock:
ffff88803fffeba0 (&pgdat->kswapd_wait){-.-.}-{2:2}, at: __wake_up_common_lock+0xb8/0x140 kernel/sched/wait.c:137

but task is already holding lock:
ffff88802c72b858 (hrtimer_bases.lock){-.-.}-{2:2}, at: __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
ffff88802c72b858 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x23e/0xbe0 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+0xe9/0xd80 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+0xad/0x330 kernel/sched/core.c:2082
       __sched_setscheduler.constprop.0+0xb89/0x25d0 kernel/sched/core.c:7774
       _sched_setscheduler kernel/sched/core.c:7820 [inline]
       sched_setscheduler_nocheck kernel/sched/core.c:7867 [inline]
       sched_set_fifo+0xb1/0x110 kernel/sched/core.c:7891
       irq_thread+0xe3/0x540 kernel/irq/manage.c:1302
       kthread+0x344/0x440 kernel/kthread.c:379
       ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

-> #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:9541
       set_rq_online kernel/sched/core.c:9533 [inline]
       sched_cpu_activate+0x216/0x440 kernel/sched/core.c:9649
       cpuhp_invoke_callback+0x645/0xeb0 kernel/cpu.c:192
       cpuhp_thread_fun+0x47f/0x700 kernel/cpu.c:815
       smpboot_thread_fn+0x659/0x9e0 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:12095
       sched_cgroup_fork+0x3d1/0x540 kernel/sched/core.c:4777
       copy_process+0x4b8a/0x7600 kernel/fork.c:2618
       kernel_clone+0xeb/0x890 kernel/fork.c:2918
       user_mode_thread+0xb1/0xf0 kernel/fork.c:2996
       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/0x1c40 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:7797
       rmqueue mm/page_alloc.c:3057 [inline]
       get_page_from_freelist+0x6c5/0x2c00 mm/page_alloc.c:3499
       __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4768
       __folio_alloc+0x16/0x40 mm/page_alloc.c:4800
       vma_alloc_folio+0x155/0x890 mm/mempolicy.c:2240
       wp_page_copy mm/memory.c:3070 [inline]
       do_wp_page+0x173d/0x33c0 mm/memory.c:3432
       handle_pte_fault mm/memory.c:4964 [inline]
       __handle_mm_fault+0x1635/0x41c0 mm/memory.c:5089
       handle_mm_fault+0x2af/0x9f0 mm/memory.c:5243
       do_user_addr_fault+0x2ca/0x1210 arch/x86/mm/fault.c:1349
       handle_page_fault arch/x86/mm/fault.c:1534 [inline]
       exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

-> #0 (&pgdat->kswapd_wait){-.-.}-{2:2}:
       check_prev_add kernel/locking/lockdep.c:3108 [inline]
       check_prevs_add kernel/locking/lockdep.c:3227 [inline]
       validate_chain kernel/locking/lockdep.c:3842 [inline]
       __lock_acquire+0x2f21/0x5df0 kernel/locking/lockdep.c:5074
       lock_acquire kernel/locking/lockdep.c:5691 [inline]
       lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5656
       __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:7797
       wake_all_kswapds+0x182/0x2d0 mm/page_alloc.c:4028
       __alloc_pages_slowpath.constprop.0+0x1724/0x2170 mm/page_alloc.c:4296
       __alloc_pages+0x408/0x4a0 mm/page_alloc.c:4781
       alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279
       alloc_slab_page mm/slub.c:1851 [inline]
       allocate_slab+0x25f/0x390 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:597 [inline]
       debug_object_activate+0xfd/0x400 lib/debugobjects.c:693
       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+0xa5b/0xbe0 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_acquire+0x1f5/0x520 kernel/locking/lockdep.c:5659
       rcu_lock_acquire include/linux/rcupdate.h:327 [inline]
       rcu_read_lock include/linux/rcupdate.h:773 [inline]
       page_ext_get+0x3c/0x320 mm/page_ext.c:167
       page_table_check_set.part.0+0x36/0x3c0 mm/page_table_check.c:109
       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]
       do_set_pte+0x6d6/0x830 mm/memory.c:4322
       filemap_map_pages+0xcae/0x13d0 mm/filemap.c:3534
       do_fault_around mm/memory.c:4493 [inline]
       do_read_fault mm/memory.c:4525 [inline]
       do_fault mm/memory.c:4659 [inline]
       do_pte_missing mm/memory.c:3647 [inline]
       handle_pte_fault mm/memory.c:4947 [inline]
       __handle_mm_fault+0x285f/0x41c0 mm/memory.c:5089
       handle_mm_fault+0x2af/0x9f0 mm/memory.c:5243
       do_user_addr_fault+0x51a/0x1210 arch/x86/mm/fault.c:1440
       handle_page_fault arch/x86/mm/fault.c:1534 [inline]
       exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570

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 ***

6 locks held by udevd/4631:
 #0: ffff88801fe63768 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:142 [inline]
 #0: ffff88801fe63768 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0xb3d/0x1210 arch/x86/mm/fault.c:1391
 #1: ffffffff8c799040 (rcu_read_lock){....}-{1:2}, at: do_fault_around mm/memory.c:4488 [inline]
 #1: ffffffff8c799040 (rcu_read_lock){....}-{1:2}, at: do_read_fault mm/memory.c:4525 [inline]
 #1: ffffffff8c799040 (rcu_read_lock){....}-{1:2}, at: do_fault mm/memory.c:4659 [inline]
 #1: ffffffff8c799040 (rcu_read_lock){....}-{1:2}, at: do_pte_missing mm/memory.c:3647 [inline]
 #1: ffffffff8c799040 (rcu_read_lock){....}-{1:2}, at: handle_pte_fault mm/memory.c:4947 [inline]
 #1: ffffffff8c799040 (rcu_read_lock){....}-{1:2}, at: __handle_mm_fault+0x27a9/0x41c0 mm/memory.c:5089
 #2: ffffffff8c799040 (rcu_read_lock){....}-{1:2}, at: filemap_map_pages+0x188/0x13d0 mm/filemap.c:3494
 #3: ffff8880239082b8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline]
 #3: ffff8880239082b8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: filemap_map_pages+0x965/0x13d0 mm/filemap.c:3508
 #4: ffffffff8c799040 (rcu_read_lock){....}-{1:2}, at: page_ext_get+0x4/0x320 mm/page_ext.c:164
 #5: ffff88802c72b858 (hrtimer_bases.lock){-.-.}-{2:2}, at: __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 #5: ffff88802c72b858 (hrtimer_bases.lock){-.-.}-{2:2}, at: __hrtimer_run_queues+0x23e/0xbe0 kernel/time/hrtimer.c:1749

stack backtrace:
CPU: 1 PID: 4631 Comm: udevd Not tainted 6.4.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
 <IRQ>
 __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:3108 [inline]
 check_prevs_add kernel/locking/lockdep.c:3227 [inline]
 validate_chain kernel/locking/lockdep.c:3842 [inline]
 __lock_acquire+0x2f21/0x5df0 kernel/locking/lockdep.c:5074
 lock_acquire kernel/locking/lockdep.c:5691 [inline]
 lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5656
 __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:7797
 wake_all_kswapds+0x182/0x2d0 mm/page_alloc.c:4028
 __alloc_pages_slowpath.constprop.0+0x1724/0x2170 mm/page_alloc.c:4296
 __alloc_pages+0x408/0x4a0 mm/page_alloc.c:4781
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279
 alloc_slab_page mm/slub.c:1851 [inline]
 allocate_slab+0x25f/0x390 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:597 [inline]
 debug_object_activate+0xfd/0x400 lib/debugobjects.c:693
 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+0xa5b/0xbe0 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_acquire+0x1f5/0x520 kernel/locking/lockdep.c:5659
Code: 98 9c 7e 83 f8 01 0f 85 b9 02 00 00 9c 58 f6 c4 02 0f 85 a4 02 00 00 48 83 7c 24 08 00 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:ffffc90002b67978 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff9200056cf31 RCX: f580a2ce44136abf
RDX: 1ffff11003f1d158 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff91527d07
R10: fffffbfff22a4fa0 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff8c799040 R15: 0000000000000000
 rcu_lock_acquire include/linux/rcupdate.h:327 [inline]
 rcu_read_lock include/linux/rcupdate.h:773 [inline]
 page_ext_get+0x3c/0x320 mm/page_ext.c:167
 page_table_check_set.part.0+0x36/0x3c0 mm/page_table_check.c:109
 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]
 do_set_pte+0x6d6/0x830 mm/memory.c:4322
 filemap_map_pages+0xcae/0x13d0 mm/filemap.c:3534
 do_fault_around mm/memory.c:4493 [inline]
 do_read_fault mm/memory.c:4525 [inline]
 do_fault mm/memory.c:4659 [inline]
 do_pte_missing mm/memory.c:3647 [inline]
 handle_pte_fault mm/memory.c:4947 [inline]
 __handle_mm_fault+0x285f/0x41c0 mm/memory.c:5089
 handle_mm_fault+0x2af/0x9f0 mm/memory.c:5243
 do_user_addr_fault+0x51a/0x1210 arch/x86/mm/fault.c:1440
 handle_page_fault arch/x86/mm/fault.c:1534 [inline]
 exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7fbe8e677140
Code: 68 25 00 00 00 e9 e0 fe ff ff ff 25 5a 9b 17 00 68 24 00 00 00 e9 d0 fe ff ff ff 25 52 9b 17 00 68 23 00 00 00 e9 c0 fe ff ff <ff> 25 4a 9b 17 00 68 22 00 00 00 e9 b0 fe ff ff ff 25 42 9b 17 00
RSP: 002b:00007ffc1236c838 EFLAGS: 00010246
RAX: 00007ffc1236cef0 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000025 RDI: 00005596d4ffe4bb
RBP: 00007ffc1236cd60 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffc123e2090 R11: 0000000000000246 R12: 00007ffc1236ced8
R13: 00000000fbad8001 R14: 00007ffc1236ced8 R15: 00007ffc1236ce50
 </TASK>
----------------
Code disassembly (best guess):
   0:	98                   	cwtl
   1:	9c                   	pushfq
   2:	7e 83                	jle    0xffffff87
   4:	f8                   	clc
   5:	01 0f                	add    %ecx,(%rdi)
   7:	85 b9 02 00 00 9c    	test   %edi,-0x63fffffe(%rcx)
   d:	58                   	pop    %rax
   e:	f6 c4 02             	test   $0x2,%ah
  11:	0f 85 a4 02 00 00    	jne    0x2bb
  17:	48 83 7c 24 08 00    	cmpq   $0x0,0x8(%rsp)
  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 c3             	add    %rax,%rbx <-- trapping instruction
  2d:	48 c7 03 00 00 00 00 	movq   $0x0,(%rbx)
  34:	48 c7 43 08 00 00 00 	movq   $0x0,0x8(%rbx)
  3b:	00
  3c:	48                   	rex.W
  3d:	8b                   	.byte 0x8b
  3e:	84                   	.byte 0x84
  3f:	24                   	.byte 0x24