================================ WARNING: inconsistent lock state 6.4.0-syzkaller-01647-g6e2332e0ab53 #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.3/16449 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff88817fffc728 (&pgdat->memcg_lru.lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline] ffff88817fffc728 (&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:5761 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5726 __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:5462 cgroup_init_subsys+0x46b/0x900 kernel/cgroup/cgroup.c:5993 cgroup_init+0xb83/0x1090 kernel/cgroup/cgroup.c:6077 start_kernel+0x398/0x490 init/main.c:1066 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+0x167/0x16b irq event stamp: 1759 hardirqs last enabled at (1758): [] mod_memcg_state include/linux/memcontrol.h:982 [inline] hardirqs last enabled at (1758): [] memcg_account_kmem+0x4f/0x80 mm/memcontrol.c:3094 hardirqs last disabled at (1759): [] uncharge_batch+0x1c7/0x560 mm/memcontrol.c:7142 softirqs last enabled at (124): [] rcu_read_unlock_bh include/linux/rcupdate.h:814 [inline] softirqs last enabled at (124): [] __dev_queue_xmit+0x1df2/0x3b10 net/core/dev.c:4271 softirqs last disabled at (207): [] invoke_softirq kernel/softirq.c:427 [inline] softirqs last disabled at (207): [] __irq_exit_rcu kernel/softirq.c:632 [inline] softirqs last disabled at (207): [] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&pgdat->memcg_lru.lock); lock(&pgdat->memcg_lru.lock); *** DEADLOCK *** 3 locks held by syz-executor.3/16449: #0: ffff888030db4328 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:142 [inline] #0: ffff888030db4328 (&mm->mmap_lock){++++}-{3:3}, at: exit_mmap+0xec/0x930 mm/mmap.c:3093 #1: ffff88802c4b8af8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline] #1: ffff88802c4b8af8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: zap_pte_range mm/memory.c:1393 [inline] #1: ffff88802c4b8af8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: zap_pmd_range mm/memory.c:1563 [inline] #1: ffff88802c4b8af8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: zap_pud_range mm/memory.c:1592 [inline] #1: ffff88802c4b8af8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: zap_p4d_range mm/memory.c:1613 [inline] #1: ffff88802c4b8af8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: unmap_page_range+0x9f7/0x38e0 mm/memory.c:1634 #2: ffffffff8c7958e0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2124 [inline] #2: ffffffff8c7958e0 (rcu_callback){....}-{0:0}, at: rcu_core+0x78d/0x1c10 kernel/rcu/tree.c:2399 stack backtrace: CPU: 3 PID: 16449 Comm: syz-executor.3 Not tainted 6.4.0-syzkaller-01647-g6e2332e0ab53 #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:3978 [inline] valid_state kernel/locking/lockdep.c:4020 [inline] mark_lock_irq kernel/locking/lockdep.c:4223 [inline] mark_lock.part.0+0x1102/0x1960 kernel/locking/lockdep.c:4685 mark_lock kernel/locking/lockdep.c:4649 [inline] mark_usage kernel/locking/lockdep.c:4574 [inline] __lock_acquire+0x1231/0x5e20 kernel/locking/lockdep.c:5098 lock_acquire kernel/locking/lockdep.c:5761 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5726 __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:2135 [inline] rcu_core+0x802/0x1c10 kernel/rcu/tree.c:2399 __do_softirq+0x1d4/0x905 kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1109 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:zap_pte_range mm/memory.c:1439 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1563 [inline] RIP: 0010:zap_pud_range mm/memory.c:1592 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1613 [inline] RIP: 0010:unmap_page_range+0x123c/0x38e0 mm/memory.c:1634 Code: 84 19 0e 00 00 e8 b4 e4 c2 ff 48 8b 7c 24 18 44 89 e6 ba 00 10 00 00 4c 09 ee e8 af 56 04 00 31 ff 89 c3 89 c6 e8 74 e0 c2 ff <84> db 0f 84 c7 f9 ff ff c7 84 24 9c 00 00 00 01 00 00 00 48 8b 44 RSP: 0018:ffffc900267c76f8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81c0e43c RDX: ffff8881536786c0 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000003 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffffea00009e3600 R14: dffffc0000000000 R15: 0000000000000000 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+0x128/0x4d0 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:308 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: 0033:0x7fadc688c389 Code: Unable to access opcode bytes at 0x7fadc688c35f. RSP: 002b:00007fadc756c218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 00007fadc69abf88 RCX: 00007fadc688c389 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fadc69abf8c RBP: 00007fadc69abf80 R08: 00007fff560f2080 R09: 0000000000000000 R10: 0000000000000024 R11: 0000000000000246 R12: 00007fadc69abf8c R13: 00007fff560d933f R14: 00007fadc756c300 R15: 0000000000022000 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 19 0e sbb %ecx,(%rsi) 2: 00 00 add %al,(%rax) 4: e8 b4 e4 c2 ff callq 0xffc2e4bd 9: 48 8b 7c 24 18 mov 0x18(%rsp),%rdi e: 44 89 e6 mov %r12d,%esi 11: ba 00 10 00 00 mov $0x1000,%edx 16: 4c 09 ee or %r13,%rsi 19: e8 af 56 04 00 callq 0x456cd 1e: 31 ff xor %edi,%edi 20: 89 c3 mov %eax,%ebx 22: 89 c6 mov %eax,%esi 24: e8 74 e0 c2 ff callq 0xffc2e09d * 29: 84 db test %bl,%bl <-- trapping instruction 2b: 0f 84 c7 f9 ff ff je 0xfffff9f8 31: c7 84 24 9c 00 00 00 movl $0x1,0x9c(%rsp) 38: 01 00 00 00 3c: 48 rex.W 3d: 8b .byte 0x8b 3e: 44 rex.R