================================ WARNING: inconsistent lock state 6.4.0-rc7-syzkaller-00234-g547cc9be86f4 #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.0/31272 [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: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: 38749 hardirqs last enabled at (38748): [] mod_memcg_state include/linux/memcontrol.h:982 [inline] hardirqs last enabled at (38748): [] memcg_account_kmem+0x4f/0x80 mm/memcontrol.c:3094 hardirqs last disabled at (38749): [] uncharge_batch+0x1c7/0x560 mm/memcontrol.c:7142 softirqs last enabled at (38558): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (38558): [] __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650 softirqs last disabled at (38617): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (38617): [] __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 *** 3 locks held by syz-executor.0/31272: #0: ffff888105bfe460 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888031bb8740 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888031bb8740 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 #2: ffffffff8c796020 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2104 [inline] #2: ffffffff8c796020 (rcu_callback){....}-{0:0}, at: rcu_core+0x791/0x1ad0 kernel/rcu/tree.c:2377 stack backtrace: CPU: 1 PID: 31272 Comm: syz-executor.0 Not tainted 6.4.0-rc7-syzkaller-00234-g547cc9be86f4 #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:kmem_cache_free+0x135/0x370 mm/slab.c:3602 Code: f2 4c 89 ee 4c 89 e7 e8 19 fb ff ff 48 85 db 0f 85 1f 01 00 00 9c 58 f6 c4 02 0f 85 2e 01 00 00 48 85 db 74 01 fb 48 83 c4 20 <5b> 5d 41 5c 41 5d 41 5e 41 5f c3 65 8b 05 45 b6 2e 7e 83 f8 07 0f RSP: 0018:ffffc90004495f00 EFLAGS: 00000286 RAX: 0000000000000006 RBX: 0000000000000200 RCX: 1ffffffff22abeae RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffea0000706f80 R08: 0000000000000001 R09: ffffffff91520da7 R10: 0000000000000001 R11: 0000000000094001 R12: ffff888100e76800 R13: ffff88801c1be9f8 R14: ffffffff81f4d57e R15: ffff888017256b00 free_buffer_head+0x4e/0xf0 fs/buffer.c:2990 try_to_free_buffers+0x1bc/0x2c0 fs/buffer.c:2931 jbd2_journal_try_to_free_buffers+0x2a8/0x340 fs/jbd2/transaction.c:2196 ext4_release_folio+0x19a/0x360 fs/ext4/inode.c:3175 filemap_release_folio+0x13f/0x1b0 mm/filemap.c:4124 shrink_folio_list+0x2f51/0x3dc0 mm/vmscan.c:2062 evict_folios+0x794/0x1940 mm/vmscan.c:5143 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:3929 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710 __kernel_write_iter+0x262/0x7a0 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+0x2f2b/0x4020 fs/coredump.c:764 get_signal+0x1c02/0x25b0 kernel/signal.c:2862 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 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: 0033:0x178890bfdaa7 Code: Unable to access opcode bytes at 0x178890bfda7d. RSP: 002b:00000000200003b8 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f9ebb9ac050 RCX: 00007f9ebb88c389 RDX: 00000000200003c0 RSI: 00000000200003b0 RDI: 0000000000000080 RBP: 00007f9ebb8d7493 R08: 0000000020000440 R09: 0000000020000440 R10: 0000000020000400 R11: 0000000000000202 R12: 0000000000000000 R13: 00007ffe48a7f26f R14: 00007f9ebc56a300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: f2 4c 89 ee repnz mov %r13,%rsi 4: 4c 89 e7 mov %r12,%rdi 7: e8 19 fb ff ff callq 0xfffffb25 c: 48 85 db test %rbx,%rbx f: 0f 85 1f 01 00 00 jne 0x134 15: 9c pushfq 16: 58 pop %rax 17: f6 c4 02 test $0x2,%ah 1a: 0f 85 2e 01 00 00 jne 0x14e 20: 48 85 db test %rbx,%rbx 23: 74 01 je 0x26 25: fb sti 26: 48 83 c4 20 add $0x20,%rsp * 2a: 5b pop %rbx <-- trapping instruction 2b: 5d pop %rbp 2c: 41 5c pop %r12 2e: 41 5d pop %r13 30: 41 5e pop %r14 32: 41 5f pop %r15 34: c3 retq 35: 65 8b 05 45 b6 2e 7e mov %gs:0x7e2eb645(%rip),%eax # 0x7e2eb681 3c: 83 f8 07 cmp $0x7,%eax 3f: 0f .byte 0xf