================================ WARNING: inconsistent lock state 6.4.0-rc6-syzkaller-00217-g4973ca295528 #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.1/1451 [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: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: 187219 hardirqs last enabled at (187218): [] mod_memcg_state include/linux/memcontrol.h:982 [inline] hardirqs last enabled at (187218): [] memcg_account_kmem+0x4f/0x80 mm/memcontrol.c:3094 hardirqs last disabled at (187219): [] uncharge_batch+0x1c7/0x560 mm/memcontrol.c:7142 softirqs last enabled at (187066): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (187066): [] __irq_exit_rcu+0x114/0x190 kernel/softirq.c:650 softirqs last disabled at (187069): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (187069): [] __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.1/1451: #0: ffff8880220a2b98 (&sbi->s_writepages_rwsem){.+.+}-{0:0}, at: do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 #1: ffff888021f7c990 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xfb4/0x14e0 fs/jbd2/transaction.c:461 #2: ffffffff8c795fe0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2104 [inline] #2: ffffffff8c795fe0 (rcu_callback){....}-{0:0}, at: rcu_core+0x791/0x1ad0 kernel/rcu/tree.c:2377 stack backtrace: CPU: 2 PID: 1451 Comm: syz-executor.1 Not tainted 6.4.0-rc6-syzkaller-00217-g4973ca295528 #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:bytes_is_nonzero mm/kasan/generic.c:87 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:178 [inline] RIP: 0010:kasan_check_range+0xd6/0x190 mm/kasan/generic.c:187 Code: 48 83 c0 01 48 39 d0 74 7a 80 38 00 74 f2 48 89 c2 b8 01 00 00 00 48 85 d2 75 56 5b 5d 41 5c c3 48 85 d2 74 5e 48 01 ea eb 09 <48> 83 c0 01 48 39 d0 74 50 80 38 00 74 f2 eb d4 41 bc 08 00 00 00 RSP: 0018:ffffc900066a7398 EFLAGS: 00000246 RAX: fffff94000909308 RBX: fffff94000909309 RCX: ffffffff822ae019 RDX: fffff94000909309 RSI: 0000000000000008 RDI: ffffea0004849840 RBP: fffff94000909308 R08: 0000000000000000 R09: ffffea0004849847 R10: fffff94000909308 R11: 0000000000000001 R12: ffffea0004849840 R13: ffffea0004849868 R14: 0000000000000000 R15: dffffc0000000000 instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] folio_test_head include/linux/page-flags.h:769 [inline] folio_test_large include/linux/page-flags.h:790 [inline] folio_nr_pages include/linux/mm.h:1976 [inline] mpage_prepare_extent_to_map+0x639/0x1450 fs/ext4/inode.c:2484 ext4_do_writepages+0x1235/0x3290 fs/ext4/inode.c:2701 ext4_writepages+0x304/0x770 fs/ext4/inode.c:2792 do_writepages+0x1a8/0x640 mm/page-writeback.c:2551 filemap_fdatawrite_wbc mm/filemap.c:390 [inline] filemap_fdatawrite_wbc+0x147/0x1b0 mm/filemap.c:380 __filemap_fdatawrite_range+0xb8/0xf0 mm/filemap.c:423 ext4_alloc_da_blocks+0x1e8/0x270 fs/ext4/inode.c:3056 ext4_release_file+0x181/0x370 fs/ext4/file.c:158 __fput+0x27c/0xa90 fs/file_table.c:321 task_work_run+0x16f/0x270 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xaa3/0x29b0 kernel/exit.c:874 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: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 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7fd13288c391 Code: Unable to access opcode bytes at 0x7fd13288c367. RSP: 002b:0000000020000470 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007fd1329abf80 RCX: 00007fd13288c389 RDX: 0000000020000100 RSI: 0000000020000470 RDI: 000000000500d080 RBP: 00007fd1328d7493 R08: 0000000020000300 R09: 0000000020000300 R10: 0000000020000140 R11: 0000000000000202 R12: 0000000000000000 R13: 00007ffc92bcb54f R14: 00007fd133656300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 48 83 c0 01 add $0x1,%rax 4: 48 39 d0 cmp %rdx,%rax 7: 74 7a je 0x83 9: 80 38 00 cmpb $0x0,(%rax) c: 74 f2 je 0x0 e: 48 89 c2 mov %rax,%rdx 11: b8 01 00 00 00 mov $0x1,%eax 16: 48 85 d2 test %rdx,%rdx 19: 75 56 jne 0x71 1b: 5b pop %rbx 1c: 5d pop %rbp 1d: 41 5c pop %r12 1f: c3 retq 20: 48 85 d2 test %rdx,%rdx 23: 74 5e je 0x83 25: 48 01 ea add %rbp,%rdx 28: eb 09 jmp 0x33 * 2a: 48 83 c0 01 add $0x1,%rax <-- trapping instruction 2e: 48 39 d0 cmp %rdx,%rax 31: 74 50 je 0x83 33: 80 38 00 cmpb $0x0,(%rax) 36: 74 f2 je 0x2a 38: eb d4 jmp 0xe 3a: 41 bc 08 00 00 00 mov $0x8,%r12d