list_add corruption. prev->next should be next (ffff8881f715c060), but was ffff888106dadc70. (prev=ffff888106dadc70). ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:28! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 685 Comm: kworker/1:15 Not tainted 5.10.110-syzkaller-01300-ge08dd85cc95e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:__list_add_valid+0xc6/0xd0 lib/list_debug.c:26 Code: 48 c7 c7 80 d1 43 85 4c 89 e6 4c 89 f1 31 c0 e8 3d f4 3f 02 0f 0b 48 c7 c7 40 d2 43 85 4c 89 f6 4c 89 e1 31 c0 e8 27 f4 3f 02 <0f> 0b 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 54 53 49 RSP: 0018:ffffc90000160a00 EFLAGS: 00010046 RAX: 0000000000000075 RBX: ffff8881f715c068 RCX: 4757e230be605400 RDX: 0000000080000102 RSI: 0000000080000102 RDI: 0000000000000000 RBP: ffffc90000160a28 R08: ffffffff8153a9a8 R09: ffffed103ee2a5d8 R10: ffffed103ee2a5d8 R11: 1ffff1103ee2a5d7 R12: ffff888106dadc70 R13: dffffc0000000000 R14: ffff8881f715c060 R15: ffff888106dadc70 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020fec000 CR3: 0000000112ef0000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_add include/linux/list.h:67 [inline] list_add_tail include/linux/list.h:100 [inline] insert_work+0x107/0x330 kernel/workqueue.c:1352 __queue_work+0x971/0xd30 kernel/workqueue.c:1514 queue_work_on+0xf2/0x150 kernel/workqueue.c:1541 queue_work include/linux/workqueue.h:513 [inline] css_release+0xae/0xc0 kernel/cgroup/cgroup.c:5146 percpu_ref_put_many include/linux/percpu-refcount.h:322 [inline] percpu_ref_put include/linux/percpu-refcount.h:338 [inline] percpu_ref_call_confirm_rcu lib/percpu-refcount.c:162 [inline] percpu_ref_switch_to_atomic_rcu+0x5a2/0x5b0 lib/percpu-refcount.c:199 rcu_do_batch+0x4f8/0xbc0 kernel/rcu/tree.c:2485 rcu_core+0x59b/0xe30 kernel/rcu/tree.c:2722 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2735 __do_softirq+0x27e/0x596 kernel/softirq.c:305 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77 do_softirq+0xca/0x110 kernel/softirq.c:355 __local_bh_enable_ip+0x70/0x80 kernel/softirq.c:190 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_bh+0x51/0x60 kernel/locking/spinlock.c:207 spin_unlock_bh include/linux/spinlock.h:399 [inline] addrconf_dad_work+0x2b2/0x15d0 net/ipv6/addrconf.c:4107 process_one_work+0x726/0xc10 kernel/workqueue.c:2296 worker_thread+0xb27/0x1550 kernel/workqueue.c:2442 kthread+0x349/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Modules linked in: ---[ end trace f49267ea8ffe10db ]--- RIP: 0010:__list_add_valid+0xc6/0xd0 lib/list_debug.c:26 Code: 48 c7 c7 80 d1 43 85 4c 89 e6 4c 89 f1 31 c0 e8 3d f4 3f 02 0f 0b 48 c7 c7 40 d2 43 85 4c 89 f6 4c 89 e1 31 c0 e8 27 f4 3f 02 <0f> 0b 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 54 53 49 RSP: 0018:ffffc90000160a00 EFLAGS: 00010046 RAX: 0000000000000075 RBX: ffff8881f715c068 RCX: 4757e230be605400 RDX: 0000000080000102 RSI: 0000000080000102 RDI: 0000000000000000 RBP: ffffc90000160a28 R08: ffffffff8153a9a8 R09: ffffed103ee2a5d8 R10: ffffed103ee2a5d8 R11: 1ffff1103ee2a5d7 R12: ffff888106dadc70 R13: dffffc0000000000 R14: ffff8881f715c060 R15: ffff888106dadc70 FS: 0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020fec000 CR3: 0000000112ef0000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400