================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x77/0x1f80 kernel/locking/lockdep.c:4926 Read of size 8 at addr ffff88801eb06358 by task kworker/u4:11/5980 CPU: 0 PID: 5980 Comm: kworker/u4:11 Not tainted 6.1.43-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023 Workqueue: btrfs-delalloc btrfs_work_helper Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 __lock_acquire+0x77/0x1f80 kernel/locking/lockdep.c:4926 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 try_to_wake_up+0xad/0x12b0 kernel/sched/core.c:4108 async_cow_start+0x5c/0x80 fs/btrfs/inode.c:1460 btrfs_work_helper+0x3ae/0xcf0 fs/btrfs/async-thread.c:280 process_one_work+0x8aa/0x11f0 kernel/workqueue.c:2292 worker_thread+0xa5f/0x1210 kernel/workqueue.c:2439 kthread+0x26e/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 2: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x50/0x370 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] kmem_cache_alloc_node+0x136/0x310 mm/slub.c:3443 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct+0x57/0x6d0 kernel/fork.c:972 copy_process+0x637/0x4020 kernel/fork.c:2090 kernel_clone+0x222/0x920 kernel/fork.c:2679 kernel_thread+0x152/0x1d0 kernel/fork.c:2739 create_kthread kernel/kthread.c:399 [inline] kthreadd+0x57d/0x740 kernel/kthread.c:746 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Freed by task 21: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] kmem_cache_free+0x292/0x510 mm/slub.c:3683 rcu_do_batch kernel/rcu/tree.c:2251 [inline] rcu_core+0xa9a/0x1790 kernel/rcu/tree.c:2511 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 call_rcu+0x163/0xa10 kernel/rcu/tree.c:2799 context_switch kernel/sched/core.c:5244 [inline] __schedule+0x1334/0x4330 kernel/sched/core.c:6554 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6723 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6747 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34 try_to_wake_up+0x87d/0x12b0 kernel/sched/core.c:4230 kthread_stop+0x186/0x690 kernel/kthread.c:706 close_ctree+0x46a/0xc35 fs/btrfs/disk-io.c:4702 generic_shutdown_super+0x130/0x340 fs/super.c:501 kill_anon_super+0x37/0x60 fs/super.c:1108 btrfs_kill_super+0x3d/0x50 fs/btrfs/super.c:2445 deactivate_locked_super+0xa0/0x110 fs/super.c:332 cleanup_mnt+0x490/0x520 fs/namespace.c:1186 task_work_run+0x246/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 call_rcu+0x163/0xa10 kernel/rcu/tree.c:2799 put_task_struct_rcu_user kernel/exit.c:231 [inline] release_task+0x159b/0x16e0 kernel/exit.c:281 wait_task_zombie kernel/exit.c:1205 [inline] wait_consider_task+0x1a3f/0x2e20 kernel/exit.c:1432 do_wait_thread kernel/exit.c:1495 [inline] do_wait+0x328/0xb70 kernel/exit.c:1612 kernel_wait4+0x29e/0x3e0 kernel/exit.c:1775 __do_sys_wait4 kernel/exit.c:1803 [inline] __se_sys_wait4 kernel/exit.c:1799 [inline] __x64_sys_wait4+0x130/0x1e0 kernel/exit.c:1799 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88801eb05940 which belongs to the cache task_struct of size 7360 The buggy address is located 2584 bytes inside of 7360-byte region [ffff88801eb05940, ffff88801eb07600) The buggy address belongs to the physical page: page:ffffea00007ac000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1eb00 head:ffffea00007ac000 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88807c3c8e81 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00006bd200 dead000000000002 ffff8881400073c0 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88807c3c8e81 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 23858, tgid 23858 (syz-executor.0), ts 1427494572931, free_ts 1427483759921 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2533 prep_new_page mm/page_alloc.c:2540 [inline] get_page_from_freelist+0x32ed/0x3480 mm/page_alloc.c:4292 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5559 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xa71/0x1080 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] kmem_cache_alloc_node+0x1cf/0x310 mm/slub.c:3443 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct+0x57/0x6d0 kernel/fork.c:972 copy_process+0x637/0x4020 kernel/fork.c:2090 kernel_clone+0x222/0x920 kernel/fork.c:2679 __do_sys_clone3 kernel/fork.c:2978 [inline] __se_sys_clone3+0x373/0x410 kernel/fork.c:2962 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1460 [inline] free_pcp_prepare mm/page_alloc.c:1510 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3388 free_unref_page+0x98/0x570 mm/page_alloc.c:3484 __skb_frag_unref include/linux/skbuff.h:3396 [inline] skb_release_data+0x37f/0x7a0 net/core/skbuff.c:783 skb_release_all net/core/skbuff.c:854 [inline] __kfree_skb+0x4c/0x60 net/core/skbuff.c:868 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3334 [inline] tcp_ack+0x2356/0x6c00 net/ipv4/tcp_input.c:3889 tcp_rcv_established+0xf53/0x1f00 net/ipv4/tcp_input.c:5920 tcp_v4_do_rcv+0x487/0xb00 net/ipv4/tcp_ipv4.c:1677 tcp_v4_rcv+0x29e0/0x3250 net/ipv4/tcp_ipv4.c:2098 ip_protocol_deliver_rcu+0x381/0x740 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x28c/0x4c0 net/ipv4/ip_input.c:233 NF_HOOK+0x364/0x410 include/linux/netfilter.h:302 dst_input include/net/dst.h:454 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:580 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:630 [inline] ip_sublist_rcv+0xa91/0xdd0 net/ipv4/ip_input.c:638 ip_list_rcv+0x422/0x470 net/ipv4/ip_input.c:673 __netif_receive_skb_list_ptype net/core/dev.c:5539 [inline] __netif_receive_skb_list_core+0x6b1/0x890 net/core/dev.c:5587 __netif_receive_skb_list net/core/dev.c:5639 [inline] netif_receive_skb_list_internal+0x9ed/0xdf0 net/core/dev.c:5730 gro_normal_list include/net/gro.h:433 [inline] napi_complete_done+0x352/0x820 net/core/dev.c:6071 Memory state around the buggy address: ffff88801eb06200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801eb06280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801eb06300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801eb06380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801eb06400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================