================================ WARNING: inconsistent lock state 6.4.0-rc6-syzkaller-00279-g8c1f0c38b310 #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.0/20620 [HC0[0]:SC1[1]:HE0:SE0] takes: ffff88803ffff728 (&pgdat->memcg_lru.lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:350 [inline] ffff88803ffff728 (&pgdat->memcg_lru.lock){+.?.}-{2:2}, at: lru_gen_rotate_memcg+0x64/0xab0 mm/vmscan.c:4749 {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:4797 mem_cgroup_css_online+0x227/0x3b0 mm/memcontrol.c:5468 online_css+0xaf/0x2a0 kernel/cgroup/cgroup.c:5491 cgroup_init_subsys+0x46b/0x900 kernel/cgroup/cgroup.c:6022 cgroup_init+0xb83/0x1090 kernel/cgroup/cgroup.c:6106 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: 153313 hardirqs last enabled at (153312): [] mod_memcg_state include/linux/memcontrol.h:982 [inline] hardirqs last enabled at (153312): [] memcg_account_kmem+0x4f/0x80 mm/memcontrol.c:3094 hardirqs last disabled at (153313): [] uncharge_batch+0x1c7/0x560 mm/memcontrol.c:7142 softirqs last enabled at (148486): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (148486): [] __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650 softirqs last disabled at (153215): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (153215): [] __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.0/20620: #0: ffff888048506460 (sb_writers#4){.+.+}-{0:0}, at: get_signal+0x1c02/0x25b0 kernel/signal.c:2862 #1: ffff888029565e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:775 [inline] #1: ffff888029565e00 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0xb0/0x460 fs/ext4/file.c:283 #2: ffffffff8c798fa0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2104 [inline] #2: ffffffff8c798fa0 (rcu_callback){....}-{0:0}, at: rcu_core+0x791/0x1ad0 kernel/rcu/tree.c:2377 stack backtrace: CPU: 1 PID: 20620 Comm: syz-executor.0 Not tainted 6.4.0-rc6-syzkaller-00279-g8c1f0c38b310 #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:4749 lru_gen_soft_reclaim+0x62/0x70 mm/vmscan.c:4852 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:debug_lockdep_rcu_enabled+0x0/0x30 kernel/rcu/update.c:318 Code: 0f 0b 48 c7 c7 80 6b 4c 8a e8 2c 14 00 00 65 c7 05 21 cd f1 75 00 00 00 00 eb bc e8 da fa ff ff eb bc 0f 1f 84 00 00 00 00 00 0f 1e fa 8b 05 6e dc 69 04 85 c0 74 21 8b 05 6c 10 6a 04 85 c0 RSP: 0018:ffffc90006f7e050 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffffff8a570ae0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000094001 R12: 00000000000006ca R13: ffffc90006f7e3b0 R14: ffffea0001e46618 R15: ffffc90006f7e3a8 __might_resched+0x2a/0x580 kernel/sched/core.c:10115 shrink_folio_list+0x29e/0x3dc0 mm/vmscan.c:1738 evict_folios+0x794/0x1940 mm/vmscan.c:5158 try_to_shrink_lruvec+0x82c/0xb90 mm/vmscan.c:5334 lru_gen_shrink_lruvec mm/vmscan.c:5471 [inline] shrink_lruvec+0x216/0x2810 mm/vmscan.c:6246 shrink_node_memcgs mm/vmscan.c:6467 [inline] shrink_node+0x761/0x3500 mm/vmscan.c:6502 shrink_zones mm/vmscan.c:6737 [inline] do_try_to_free_pages+0x3b4/0x17b0 mm/vmscan.c:6799 try_to_free_mem_cgroup_pages+0x368/0x840 mm/vmscan.c:7114 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+0x2aed/0x3c70 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: 0023:0x0 Code: Unable to access opcode bytes at 0xffffffffffffffd6. RSP: 002b:00000000200001b0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000100000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000020000280 RDI: 00000000200002c0 RBP: 000000000071c884 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: 0f 0b ud2 2: 48 c7 c7 80 6b 4c 8a mov $0xffffffff8a4c6b80,%rdi 9: e8 2c 14 00 00 callq 0x143a e: 65 c7 05 21 cd f1 75 movl $0x0,%gs:0x75f1cd21(%rip) # 0x75f1cd3a 15: 00 00 00 00 19: eb bc jmp 0xffffffd7 1b: e8 da fa ff ff callq 0xfffffafa 20: eb bc jmp 0xffffffde 22: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 29: 00 * 2a: f3 0f 1e fa endbr64 <-- trapping instruction 2e: 8b 05 6e dc 69 04 mov 0x469dc6e(%rip),%eax # 0x469dca2 34: 85 c0 test %eax,%eax 36: 74 21 je 0x59 38: 8b 05 6c 10 6a 04 mov 0x46a106c(%rip),%eax # 0x46a10aa 3e: 85 c0 test %eax,%eax