================================================================== BUG: KASAN: slab-use-after-free in __lock_acquire+0x2da1/0x3b40 kernel/locking/lockdep.c:5005 Read of size 8 at addr ffff88801ef189f8 by task kworker/u16:0/11 CPU: 0 PID: 11 Comm: kworker/u16:0 Not tainted 6.8.0-rc7-syzkaller-00229-g10d48d70e82d #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Workqueue: btrfs-fixup btrfs_work_helper Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 __lock_acquire+0x2da1/0x3b40 kernel/locking/lockdep.c:5005 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline] try_to_wake_up+0x9b/0x13e0 kernel/sched/core.c:4253 btrfs_add_delayed_iput+0x30a/0x3d0 fs/btrfs/inode.c:3369 btrfs_writepage_fixup_worker+0xa18/0x14a0 fs/btrfs/inode.c:2815 btrfs_work_helper+0x213/0xc00 fs/btrfs/async-thread.c:315 process_one_work+0x889/0x15e0 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787 kthread+0x2c6/0x3b0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 Allocated by task 2: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc_node+0x177/0x350 mm/slub.c:3903 alloc_task_struct_node kernel/fork.c:174 [inline] dup_task_struct kernel/fork.c:1104 [inline] copy_process+0x44f/0x97b0 kernel/fork.c:2327 kernel_clone+0xfd/0x930 kernel/fork.c:2902 kernel_thread+0xc0/0x100 kernel/fork.c:2964 create_kthread kernel/kthread.c:411 [inline] kthreadd+0x4fb/0x7d0 kernel/kthread.c:764 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 Freed by task 0: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:589 poison_slab_object mm/kasan/common.c:240 [inline] __kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kmem_cache_free+0x129/0x360 mm/slub.c:4363 put_task_struct include/linux/sched/task.h:138 [inline] put_task_struct include/linux/sched/task.h:125 [inline] delayed_put_task_struct+0x21b/0x2c0 kernel/exit.c:229 rcu_do_batch kernel/rcu/tree.c:2190 [inline] rcu_core+0x819/0x1680 kernel/rcu/tree.c:2465 __do_softirq+0x21c/0x8e7 kernel/softirq.c:553 Last potentially related work creation: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:551 __call_rcu_common.constprop.0+0x9a/0x7c0 kernel/rcu/tree.c:2715 put_task_struct_rcu_user kernel/exit.c:235 [inline] put_task_struct_rcu_user+0x87/0xd0 kernel/exit.c:232 context_switch kernel/sched/core.c:5403 [inline] __schedule+0xf1a/0x5c60 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0xe9/0x280 kernel/sched/core.c:6817 schedule_timeout+0x25b/0x2a0 kernel/time/timer.c:2159 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common+0x3e4/0x600 kernel/sched/completion.c:116 kthread_stop+0x18e/0x600 kernel/kthread.c:709 close_ctree+0x354/0xf90 fs/btrfs/disk-io.c:4336 generic_shutdown_super+0x159/0x3d0 fs/super.c:641 kill_anon_super+0x3a/0x60 fs/super.c:1225 btrfs_kill_super+0x3b/0x50 fs/btrfs/super.c:2093 deactivate_locked_super+0xbe/0x1a0 fs/super.c:472 deactivate_super+0xde/0x100 fs/super.c:505 cleanup_mnt+0x222/0x450 fs/namespace.c:1267 task_work_run+0x14f/0x250 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa8a/0x2ad0 kernel/exit.c:871 do_group_exit+0xd4/0x2a0 kernel/exit.c:1020 __do_sys_exit_group kernel/exit.c:1031 [inline] __se_sys_exit_group kernel/exit.c:1029 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1029 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 The buggy address belongs to the object at ffff88801ef18000 which belongs to the cache task_struct of size 8960 The buggy address is located 2552 bytes inside of freed 8960-byte region [ffff88801ef18000, ffff88801ef1a300) The buggy address belongs to the physical page: page:ffffea00007bc600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1ef18 head:ffffea00007bc600 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888015ea4140 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080030003 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2, tgid 2 (kthreadd), ts 51832969605, free_ts 48481201818 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311 __alloc_pages+0x22c/0x2430 mm/page_alloc.c:4569 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2190 [inline] allocate_slab mm/slub.c:2354 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2407 ___slab_alloc+0x4af/0x19a0 mm/slub.c:3540 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3625 __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] kmem_cache_alloc_node+0x10a/0x350 mm/slub.c:3903 alloc_task_struct_node kernel/fork.c:174 [inline] dup_task_struct kernel/fork.c:1104 [inline] copy_process+0x44f/0x97b0 kernel/fork.c:2327 kernel_clone+0xfd/0x930 kernel/fork.c:2902 kernel_thread+0xc0/0x100 kernel/fork.c:2964 create_kthread kernel/kthread.c:411 [inline] kthreadd+0x4fb/0x7d0 kernel/kthread.c:764 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 page last free pid 5129 tgid 5129 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2346 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486 __folio_put_small mm/swap.c:106 [inline] __folio_put+0xc3/0x110 mm/swap.c:129 folio_put include/linux/mm.h:1494 [inline] put_page include/linux/mm.h:1563 [inline] anon_pipe_buf_release+0x3fa/0x4b0 fs/pipe.c:138 pipe_buf_release include/linux/pipe_fs_i.h:219 [inline] pipe_update_tail fs/pipe.c:234 [inline] pipe_read+0x64a/0x1410 fs/pipe.c:354 call_read_iter include/linux/fs.h:2081 [inline] new_sync_read fs/read_write.c:395 [inline] vfs_read+0xa01/0xb80 fs/read_write.c:476 ksys_read+0x1f8/0x260 fs/read_write.c:619 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Memory state around the buggy address: ffff88801ef18880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801ef18900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801ef18980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801ef18a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801ef18a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================