================================ WARNING: inconsistent lock state 6.4.0-rc7-syzkaller-00041-ge660abd551f1 #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. sshd/5175 [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: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: 1303781 hardirqs last enabled at (1303780): [] mod_memcg_state include/linux/memcontrol.h:982 [inline] hardirqs last enabled at (1303780): [] memcg_account_kmem+0x4f/0x80 mm/memcontrol.c:3094 hardirqs last disabled at (1303781): [] uncharge_batch+0x1c7/0x560 mm/memcontrol.c:7142 softirqs last enabled at (1303654): [] tcp_sendmsg+0x3a/0x50 net/ipv4/tcp.c:1488 softirqs last disabled at (1303717): [] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (1303717): [] __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 *** 1 lock held by sshd/5175: #0: ffffffff8c796020 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2104 [inline] #0: ffffffff8c796020 (rcu_callback){....}-{0:0}, at: rcu_core+0x791/0x1ad0 kernel/rcu/tree.c:2377 stack backtrace: CPU: 3 PID: 5175 Comm: sshd Not tainted 6.4.0-rc7-syzkaller-00041-ge660abd551f1 #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:__syscall_enter_from_user_work kernel/entry/common.c:91 [inline] RIP: 0010:syscall_enter_from_user_mode+0x30/0x80 kernel/entry/common.c:112 Code: 49 89 f4 55 48 89 fd 53 48 8b 7c 24 18 e8 58 fa ff ff 66 90 66 90 e8 ff 75 7a f7 e8 6a 74 7a f7 fb 65 48 8b 04 25 00 bc 03 00 <48> 8b 70 08 40 f6 c6 3f 75 38 5b 4c 89 e0 5d 41 5c c3 e8 19 12 00 RSP: 0018:ffffc900035f7f20 EFLAGS: 00000206 RAX: ffff888022facbc0 RBX: 0000000000000000 RCX: 1ffffffff1cf3481 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc900035f7f58 R08: 0000000000000001 R09: 0000000000000001 R10: fffffbfff1cf3a8a R11: 0000000000000000 R12: 000000000000000e R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 do_syscall_64+0x1a/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f71e44c2773 Code: 00 f3 a5 48 8d 74 24 88 48 b9 ff ff ff 7f fe ff ff ff 48 21 c8 48 89 44 24 88 41 ba 08 00 00 00 44 89 c7 b8 0e 00 00 00 0f 05 <45> 31 c0 3d 00 f0 ff ff 76 06 41 89 c0 41 f7 d8 44 89 c0 5a c3 41 RSP: 002b:00007ffccc42cdf0 EFLAGS: 00000246 ORIG_RAX: 000000000000000e RAX: ffffffffffffffda RBX: 0000000000060000 RCX: 00007f71e44c2773 RDX: 00007ffccc42ced8 RSI: 00007ffccc42ce58 RDI: 0000000000000001 RBP: 000055fec651f560 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 000055fec5255aa4 R13: 0000000000000335 R14: 000055fec52563e8 R15: 00007ffccc42ce58 ---------------- Code disassembly (best guess): 0: 49 89 f4 mov %rsi,%r12 3: 55 push %rbp 4: 48 89 fd mov %rdi,%rbp 7: 53 push %rbx 8: 48 8b 7c 24 18 mov 0x18(%rsp),%rdi d: e8 58 fa ff ff callq 0xfffffa6a 12: 66 90 xchg %ax,%ax 14: 66 90 xchg %ax,%ax 16: e8 ff 75 7a f7 callq 0xf77a761a 1b: e8 6a 74 7a f7 callq 0xf77a748a 20: fb sti 21: 65 48 8b 04 25 00 bc mov %gs:0x3bc00,%rax 28: 03 00 * 2a: 48 8b 70 08 mov 0x8(%rax),%rsi <-- trapping instruction 2e: 40 f6 c6 3f test $0x3f,%sil 32: 75 38 jne 0x6c 34: 5b pop %rbx 35: 4c 89 e0 mov %r12,%rax 38: 5d pop %rbp 39: 41 5c pop %r12 3b: c3 retq 3c: e8 .byte 0xe8 3d: 19 12 sbb %edx,(%rdx)