================================ WARNING: inconsistent lock state 6.4.0-rc7-syzkaller-00226-ga92b7d26c743 #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.1/24503 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff88807ffdc728 (&pgdat->memcg_lru.lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline] ffff88807ffdc728 (&pgdat->memcg_lru.lock){+.?.}-{2:2}, at: lru_gen_rotate_memcg+0x64/0xab0 mm/vmscan.c:4734 {SOFTIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:350 [inline] lru_gen_online_memcg+0x16b/0x5a0 mm/vmscan.c:4782 mem_cgroup_css_online+0x227/0x3b0 mm/memcontrol.c:5468 online_css+0xaf/0x2a0 kernel/cgroup/cgroup.c:5505 cgroup_init_subsys+0x46b/0x900 kernel/cgroup/cgroup.c:6036 cgroup_init+0xb83/0x1090 kernel/cgroup/cgroup.c:6120 start_kernel+0x398/0x490 init/main.c:1077 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 irq event stamp: 261 hardirqs last enabled at (260): [] mod_memcg_state include/linux/memcontrol.h:982 [inline] hardirqs last enabled at (260): [] memcg_account_kmem+0x4f/0x80 mm/memcontrol.c:3094 hardirqs last disabled at (261): [] uncharge_batch+0x1c7/0x560 mm/memcontrol.c:7142 softirqs last enabled at (0): [] copy_process+0x227f/0x75c0 kernel/fork.c:2452 softirqs last disabled at (173): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (173): [] __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&pgdat->memcg_lru.lock); lock(&pgdat->memcg_lru.lock); *** DEADLOCK *** 4 locks held by syz-executor.1/24503: #0: ffff88802563d368 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:142 [inline] #0: ffff88802563d368 (&mm->mmap_lock){++++}-{3:3}, at: exit_mmap+0xec/0x930 mm/mmap.c:3093 #1: ffff888029176318 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline] #1: ffff888029176318 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: zap_pte_range mm/memory.c:1393 [inline] #1: ffff888029176318 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: zap_pmd_range mm/memory.c:1563 [inline] #1: ffff888029176318 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: zap_pud_range mm/memory.c:1592 [inline] #1: ffff888029176318 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: zap_p4d_range mm/memory.c:1613 [inline] #1: ffff888029176318 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: unmap_page_range+0x9f7/0x38e0 mm/memory.c:1634 #2: ffffffff8c796140 (rcu_read_lock){....}-{1:2}, at: page_ext_get+0x4/0x320 mm/page_ext.c:164 #3: ffffffff8c796020 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2104 [inline] #3: ffffffff8c796020 (rcu_callback){....}-{0:0}, at: rcu_core+0x791/0x1ad0 kernel/rcu/tree.c:2377 stack backtrace: CPU: 1 PID: 24503 Comm: syz-executor.1 Not tainted 6.4.0-rc7-syzkaller-00226-ga92b7d26c743 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_usage_bug kernel/locking/lockdep.c:3949 [inline] valid_state kernel/locking/lockdep.c:3991 [inline] mark_lock_irq kernel/locking/lockdep.c:4194 [inline] mark_lock.part.0+0x1110/0x1970 kernel/locking/lockdep.c:4656 mark_lock kernel/locking/lockdep.c:4620 [inline] mark_usage kernel/locking/lockdep.c:4545 [inline] __lock_acquire+0x1227/0x5f30 kernel/locking/lockdep.c:5042 lock_acquire kernel/locking/lockdep.c:5705 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5670 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:350 [inline] lru_gen_rotate_memcg+0x64/0xab0 mm/vmscan.c:4734 lru_gen_soft_reclaim+0x62/0x70 mm/vmscan.c:4837 uncharge_batch+0x2be/0x560 mm/memcontrol.c:7145 __mem_cgroup_uncharge+0x11f/0x290 mm/memcontrol.c:7221 mem_cgroup_uncharge include/linux/memcontrol.h:698 [inline] __folio_put_small mm/swap.c:105 [inline] __folio_put+0xb6/0x140 mm/swap.c:129 folio_put include/linux/mm.h:1430 [inline] put_page include/linux/mm.h:1499 [inline] free_page_and_swap_cache+0x257/0x2c0 mm/swap_state.c:305 __tlb_remove_table arch/x86/include/asm/tlb.h:34 [inline] __tlb_remove_table_free mm/mmu_gather.c:153 [inline] tlb_remove_table_rcu+0x89/0xe0 mm/mmu_gather.c:208 rcu_do_batch kernel/rcu/tree.c:2115 [inline] rcu_core+0x806/0x1ad0 kernel/rcu/tree.c:2377 __do_softirq+0x1d4/0x905 kernel/softirq.c:571 invoke_softirq kernel/softirq.c:445 [inline] __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650 irq_exit_rcu+0x9/0x20 kernel/softirq.c:662 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:lock_acquire+0x1f5/0x520 kernel/locking/lockdep.c:5673 Code: 76 9d 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:ffffc90028ebf508 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff920051d7ea3 RCX: 3248d3b5bf8459c1 RDX: 1ffff1100abf1358 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff91520d07 R10: fffffbfff22a41a0 R11: 0000000000094001 R12: 0000000000000002 R13: 0000000000000000 R14: ffffffff8c796140 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_clear.part.0+0x36/0x7b0 mm/page_table_check.c:73 page_table_check_clear include/linux/mmzone.h:2003 [inline] __page_table_check_pte_clear+0x265/0x2b0 mm/page_table_check.c:161 page_table_check_pte_clear include/linux/page_table_check.h:55 [inline] ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1086 [inline] zap_pte_range mm/memory.c:1413 [inline] zap_pmd_range mm/memory.c:1563 [inline] zap_pud_range mm/memory.c:1592 [inline] zap_p4d_range mm/memory.c:1613 [inline] unmap_page_range+0x2aa6/0x38e0 mm/memory.c:1634 unmap_single_vma+0x19a/0x2b0 mm/memory.c:1680 unmap_vmas+0x234/0x380 mm/memory.c:1719 exit_mmap+0x190/0x930 mm/mmap.c:3108 __mmput+0x128/0x4c0 kernel/fork.c:1351 mmput+0x60/0x70 kernel/fork.c:1373 exit_mm kernel/exit.c:567 [inline] do_exit+0x9b0/0x29b0 kernel/exit.c:861 do_group_exit+0xd4/0x2a0 kernel/exit.c:1024 get_signal+0x2318/0x25b0 kernel/signal.c:2876 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f817b88c389 Code: Unable to access opcode bytes at 0x7f817b88c35f. RSP: 002b:00007f817c6a6218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007f817b9abf88 RCX: 00007f817b88c389 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f817b9abf8c RBP: 00007f817b9abf80 R08: 00007ffc053bd080 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f817b9abf8c R13: 00007ffc053b730f R14: 00007f817c6a6300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 76 9d jbe 0xffffff9f 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