================================ WARNING: inconsistent lock state 6.4.0-syzkaller-01647-g6e2332e0ab53 #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.2/21877 [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: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: 194175 hardirqs last enabled at (194174): [] mod_memcg_state include/linux/memcontrol.h:982 [inline] hardirqs last enabled at (194174): [] memcg_account_kmem+0x4f/0x80 mm/memcontrol.c:3094 hardirqs last disabled at (194175): [] uncharge_batch+0x1c7/0x560 mm/memcontrol.c:7142 softirqs last enabled at (194014): [] invoke_softirq kernel/softirq.c:427 [inline] softirqs last enabled at (194014): [] __irq_exit_rcu kernel/softirq.c:632 [inline] softirqs last enabled at (194014): [] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 softirqs last disabled at (194033): [] invoke_softirq kernel/softirq.c:427 [inline] softirqs last disabled at (194033): [] __irq_exit_rcu kernel/softirq.c:632 [inline] softirqs last disabled at (194033): [] 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.2/21877: #0: ffff8880237ac460 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88805e2ea480 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:771 [inline] #1: ffff88805e2ea480 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_buffered_write_iter+0xb6/0x470 fs/ext4/file.c:294 #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: 2 PID: 21877 Comm: syz-executor.2 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:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 Code: 90 f3 0f 1e fa 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 fa b5 50 f7 48 89 ef e8 d2 25 51 f7 e8 2d e3 75 f7 fb bf 01 00 00 00 f2 e3 42 f7 65 8b 05 d3 37 ef 75 85 c0 74 02 5d c3 e8 10 fc eb RSP: 0018:ffffc900236e62c8 EFLAGS: 00000206 RAX: 000000000002f5ed RBX: 0000000000000000 RCX: 1ffffffff22aed62 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: ffff888106fc4050 R08: 0000000000000001 R09: ffffffff91532f67 R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000002 R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000001000 spin_unlock_irq include/linux/spinlock.h:400 [inline] evict_folios+0x708/0x1940 mm/vmscan.c:5138 try_to_shrink_lruvec+0x82c/0xb90 mm/vmscan.c:5319 lru_gen_shrink_lruvec mm/vmscan.c:5456 [inline] shrink_lruvec+0x216/0x2810 mm/vmscan.c:6231 shrink_node_memcgs mm/vmscan.c:6452 [inline] shrink_node+0x761/0x3500 mm/vmscan.c:6487 shrink_zones mm/vmscan.c:6722 [inline] do_try_to_free_pages+0x3b4/0x17b0 mm/vmscan.c:6784 try_to_free_mem_cgroup_pages+0x368/0x840 mm/vmscan.c:7099 try_charge_memcg+0x505/0x13a0 mm/memcontrol.c:2724 try_charge mm/memcontrol.c:2866 [inline] charge_memcg+0x90/0x3b0 mm/memcontrol.c:7021 __mem_cgroup_charge+0x2b/0x90 mm/memcontrol.c:7042 mem_cgroup_charge include/linux/memcontrol.h:679 [inline] __filemap_add_folio+0x617/0xe60 mm/filemap.c:857 filemap_add_folio+0xaf/0x1e0 mm/filemap.c:939 __filemap_get_folio+0x305/0x990 mm/filemap.c:1982 ext4_da_write_begin+0x3c5/0x8c0 fs/ext4/inode.c:2909 generic_perform_write+0x256/0x570 mm/filemap.c:3946 ext4_buffered_write_iter+0x161/0x470 fs/ext4/file.c:300 ext4_file_write_iter+0xbfe/0x1760 fs/ext4/file.c:721 __kernel_write_iter+0x262/0x7e0 fs/read_write.c:517 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x23c/0x710 fs/coredump.c:915 elf_core_dump+0x277e/0x36e0 fs/binfmt_elf.c:2142 do_coredump+0x2f40/0x4040 fs/coredump.c:764 get_signal+0x1c02/0x25b0 kernel/signal.c:2862 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 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:310 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7f31d9a8c391 Code: c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 48 3d 01 f0 ff ff 73 01 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:0000000020000220 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f31d9babf80 RCX: 00007f31d9a8c389 RDX: 0000000020000240 RSI: 0000000020000220 RDI: 0000000000009000 RBP: 00007f31d9ad7493 R08: 00000000200002c0 R09: 00000000200002c0 R10: 0000000020000280 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffd90d558ef R14: 00007f31da713300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 90 nop 1: f3 0f 1e fa endbr64 5: 55 push %rbp 6: 48 8b 74 24 08 mov 0x8(%rsp),%rsi b: 48 89 fd mov %rdi,%rbp e: 48 83 c7 18 add $0x18,%rdi 12: e8 fa b5 50 f7 callq 0xf750b611 17: 48 89 ef mov %rbp,%rdi 1a: e8 d2 25 51 f7 callq 0xf75125f1 1f: e8 2d e3 75 f7 callq 0xf775e351 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 f2 e3 42 f7 callq 0xf742e421 <-- trapping instruction 2f: 65 8b 05 d3 37 ef 75 mov %gs:0x75ef37d3(%rip),%eax # 0x75ef3809 36: 85 c0 test %eax,%eax 38: 74 02 je 0x3c 3a: 5d pop %rbp 3b: c3 retq 3c: e8 .byte 0xe8 3d: 10 fc adc %bh,%ah 3f: eb .byte 0xeb