================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x77/0x1f80 kernel/locking/lockdep.c:4918 Read of size 8 at addr ffff88803b928a18 by task kworker/u4:6/3707 CPU: 0 PID: 3707 Comm: kworker/u4:6 Not tainted 6.1.60-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 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:4918 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 __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/0x12e0 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+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 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+0x52/0x3a0 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:980 copy_process+0x637/0x4060 kernel/fork.c:2098 kernel_clone+0x222/0x920 kernel/fork.c:2682 kernel_thread+0x152/0x1d0 kernel/fork.c:2742 create_kthread kernel/kthread.c:399 [inline] kthreadd+0x596/0x760 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+0xad4/0x17e0 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+0x1435/0x4550 kernel/sched/core.c:6554 schedule+0xbf/0x180 kernel/sched/core.c:6630 do_nanosleep+0x192/0x5f0 kernel/time/hrtimer.c:2044 hrtimer_nanosleep+0x24d/0x490 kernel/time/hrtimer.c:2097 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1308 [inline] __se_sys_clock_nanosleep+0x323/0x3b0 kernel/time/posix-timers.c:1285 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 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 release_task+0x1637/0x16d0 wait_task_zombie kernel/exit.c:1205 [inline] wait_consider_task+0x1a64/0x2e90 kernel/exit.c:1432 do_wait_thread kernel/exit.c:1495 [inline] do_wait+0x32b/0xb80 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 ffff88803b928000 which belongs to the cache task_struct of size 7360 The buggy address is located 2584 bytes inside of 7360-byte region [ffff88803b928000, ffff88803b929cc0) The buggy address belongs to the physical page: page:ffffea0000ee4a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3b928 head:ffffea0000ee4a00 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88809c7b7fc1 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00009e9600 dead000000000002 ffff888140008500 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88809c7b7fc1 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 20711, tgid 20711 (syz-executor.5), ts 2099621283488, free_ts 2099549803657 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513 prep_new_page mm/page_alloc.c:2520 [inline] get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5545 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+0xc20/0x1270 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:980 copy_process+0x637/0x4060 kernel/fork.c:2098 kernel_clone+0x222/0x920 kernel/fork.c:2682 __do_sys_clone3 kernel/fork.c:2981 [inline] __se_sys_clone3+0x373/0x410 kernel/fork.c:2965 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:1440 [inline] free_pcp_prepare mm/page_alloc.c:1490 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3453 free_slab mm/slub.c:2031 [inline] discard_slab mm/slub.c:2037 [inline] __unfreeze_partials+0x1b7/0x210 mm/slub.c:2586 put_cpu_partial+0x17b/0x250 mm/slub.c:2662 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422 anon_vma_chain_alloc mm/rmap.c:141 [inline] __anon_vma_prepare+0x64/0x400 mm/rmap.c:195 anon_vma_prepare include/linux/rmap.h:159 [inline] do_cow_fault mm/memory.c:4608 [inline] do_fault mm/memory.c:4723 [inline] handle_pte_fault mm/memory.c:4993 [inline] __handle_mm_fault mm/memory.c:5135 [inline] handle_mm_fault+0x49af/0x5340 mm/memory.c:5256 do_user_addr_fault arch/x86/mm/fault.c:1380 [inline] handle_page_fault arch/x86/mm/fault.c:1471 [inline] exc_page_fault+0x26f/0x660 arch/x86/mm/fault.c:1527 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 Memory state around the buggy address: ffff88803b928900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803b928980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88803b928a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803b928a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803b928b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================