================================ WARNING: inconsistent lock state 6.4.0-syzkaller-00847-g88afbb21d4b3 #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.1/17064 [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:1065 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: 155333 hardirqs last enabled at (155332): [] mod_memcg_state include/linux/memcontrol.h:982 [inline] hardirqs last enabled at (155332): [] memcg_account_kmem+0x4f/0x80 mm/memcontrol.c:3094 hardirqs last disabled at (155333): [] uncharge_batch+0x1c7/0x560 mm/memcontrol.c:7142 softirqs last enabled at (136508): [] invoke_softirq kernel/softirq.c:427 [inline] softirqs last enabled at (136508): [] __irq_exit_rcu kernel/softirq.c:632 [inline] softirqs last enabled at (136508): [] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 softirqs last disabled at (155191): [] invoke_softirq kernel/softirq.c:427 [inline] softirqs last disabled at (155191): [] __irq_exit_rcu kernel/softirq.c:632 [inline] softirqs last disabled at (155191): [] 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.1/17064: #0: ffff88810714a460 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff88804fd10900 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:771 [inline] #1: ffff88804fd10900 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_buffered_write_iter+0xb6/0x470 fs/ext4/file.c:294 #2: ffffffff8c795f60 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2104 [inline] #2: ffffffff8c795f60 (rcu_callback){....}-{0:0}, at: rcu_core+0x791/0x1ad0 kernel/rcu/tree.c:2377 stack backtrace: CPU: 0 PID: 17064 Comm: syz-executor.1 Not tainted 6.4.0-syzkaller-00847-g88afbb21d4b3 #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: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:__sanitizer_cov_trace_pc+0x3b/0x70 kernel/kcov.c:207 Code: 81 e1 00 01 00 00 65 48 8b 14 25 00 ba 03 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 0c 16 00 00 85 c0 74 2b 8b 82 e8 15 00 00 <83> f8 02 75 20 48 8b 8a f0 15 00 00 8b 92 ec 15 00 00 48 8b 01 48 RSP: 0018:ffffc900280e6f20 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88804c82d740 RSI: ffffffff81f5494a RDI: 0000000000000007 RBP: ffffea0001026480 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000094001 R12: 0000000000000000 R13: ffffea0001026480 R14: ffffea0001026480 R15: 0000000000408c40 folio_memcg_kmem include/linux/memcontrol.h:545 [inline] folio_memcg include/linux/memcontrol.h:431 [inline] folio_alloc_buffers+0x8a/0x810 fs/buffer.c:864 folio_create_empty_buffers+0x2c/0x470 fs/buffer.c:1605 ext4_block_write_begin+0xb9c/0xde0 fs/ext4/inode.c:1040 ext4_da_write_begin+0x407/0x8c0 fs/ext4/inode.c:2918 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 exc_page_fault+0xc0/0x170 arch/x86/mm/fault.c:1593 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 002b:0000000020000008 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f6337dabf80 RCX: 00007f6337c8c389 RDX: 0000000020001000 RSI: 0000000020000000 RDI: 0000000021001000 RBP: 00007f6337cd7493 R08: 0000000020001080 R09: 0000000020001080 R10: 0000000020001040 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffd05cf0a7f R14: 00007f63367fe300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 81 e1 00 01 00 00 and $0x100,%ecx 6: 65 48 8b 14 25 00 ba mov %gs:0x3ba00,%rdx d: 03 00 f: a9 00 01 ff 00 test $0xff0100,%eax 14: 74 0e je 0x24 16: 85 c9 test %ecx,%ecx 18: 74 35 je 0x4f 1a: 8b 82 0c 16 00 00 mov 0x160c(%rdx),%eax 20: 85 c0 test %eax,%eax 22: 74 2b je 0x4f 24: 8b 82 e8 15 00 00 mov 0x15e8(%rdx),%eax * 2a: 83 f8 02 cmp $0x2,%eax <-- trapping instruction 2d: 75 20 jne 0x4f 2f: 48 8b 8a f0 15 00 00 mov 0x15f0(%rdx),%rcx 36: 8b 92 ec 15 00 00 mov 0x15ec(%rdx),%edx 3c: 48 8b 01 mov (%rcx),%rax 3f: 48 rex.W