================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x114/0x7638 kernel/locking/lockdep.c:4882 Read of size 8 at addr ffff0000c71e5ad8 by task kworker/u4:14/5515 CPU: 1 PID: 5515 Comm: kworker/u4:14 Not tainted 5.15.175-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: btrfs-delalloc btrfs_work_helper Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x174/0x1e4 mm/kasan/report.c:451 __asan_report_load8_noabort+0x44/0x50 mm/kasan/report_generic.c:309 __lock_acquire+0x114/0x7638 kernel/locking/lockdep.c:4882 lock_acquire+0x240/0x77c kernel/locking/lockdep.c:5623 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xc4/0x14c kernel/locking/spinlock.c:162 try_to_wake_up+0xb0/0xc2c kernel/sched/core.c:4027 wake_up_process+0x18/0x24 kernel/sched/core.c:4212 btrfs_add_delayed_iput+0x280/0x2ec fs/btrfs/inode.c:3422 async_cow_start+0x6c/0x94 fs/btrfs/inode.c:1345 btrfs_work_helper+0x348/0x1554 fs/btrfs/async-thread.c:325 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310 worker_thread+0x910/0x1034 kernel/workqueue.c:2457 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Allocated by task 2: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x8c/0xcc mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x74/0x3f4 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] kmem_cache_alloc_node+0x208/0x49c mm/slub.c:3256 alloc_task_struct_node kernel/fork.c:172 [inline] dup_task_struct+0x74/0xcf0 kernel/fork.c:895 copy_process+0x52c/0x3750 kernel/fork.c:2036 kernel_clone+0x1d8/0xa58 kernel/fork.c:2603 kernel_thread+0x148/0x1bc kernel/fork.c:2655 create_kthread kernel/kthread.c:357 [inline] kthreadd+0x588/0x7d0 kernel/kthread.c:703 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Freed by task 20: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x84 mm/kasan/common.c:46 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1ec mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0xdc/0x3c4 mm/slub.c:3515 free_task_struct kernel/fork.c:177 [inline] free_task+0xe8/0x14c kernel/fork.c:475 __put_task_struct+0x1a8/0x24c kernel/fork.c:764 put_task_struct include/linux/sched/task.h:141 [inline] delayed_put_task_struct+0x124/0x380 kernel/exit.c:220 rcu_do_batch kernel/rcu/tree.c:2523 [inline] rcu_core+0x830/0x1b34 kernel/rcu/tree.c:2763 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2776 handle_softirqs+0x384/0xdbc kernel/softirq.c:558 run_ksoftirqd+0x6c/0x29c kernel/softirq.c:925 smpboot_thread_fn+0x4b0/0x920 kernel/smpboot.c:164 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Last potentially related work creation: kasan_save_stack+0x38/0x68 mm/kasan/common.c:38 kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x118/0xb40 kernel/rcu/tree.c:3087 put_task_struct_rcu_user+0x70/0xe0 kernel/exit.c:226 finish_task_switch+0x3a0/0x6b4 kernel/sched/core.c:4941 context_switch kernel/sched/core.c:5030 [inline] __schedule+0xf14/0x1e48 kernel/sched/core.c:6373 preempt_schedule_irq+0x90/0x274 kernel/sched/core.c:6777 arm64_preempt_schedule_irq+0x174/0x2c4 arch/arm64/kernel/entry-common.c:260 el1_interrupt+0x40/0x58 arch/arm64/kernel/entry-common.c:463 el1h_64_irq_handler+0x18/0x24 arch/arm64/kernel/entry-common.c:470 el1h_64_irq+0x78/0x7c arch/arm64/kernel/entry.S:522 lock_acquire+0x0/0x77c kernel/locking/lockdep.c:5580 might_alloc include/linux/sched/mm.h:206 [inline] slab_pre_alloc_hook+0x38/0xe8 mm/slab.h:492 slab_alloc_node mm/slub.c:3134 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x98/0x45c mm/slub.c:3233 getname_flags+0xd0/0x480 fs/namei.c:138 getname+0x28/0x38 fs/namei.c:217 do_sys_openat2+0xd4/0x3e0 fs/open.c:1247 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1280 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Second to last potentially related work creation: kasan_save_stack+0x38/0x68 mm/kasan/common.c:38 kasan_record_aux_stack+0xd4/0x11c mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3007 [inline] call_rcu+0x118/0xb40 kernel/rcu/tree.c:3087 put_task_struct_rcu_user+0x70/0xe0 kernel/exit.c:226 finish_task_switch+0x3a0/0x6b4 kernel/sched/core.c:4941 schedule_tail+0x20/0x150 kernel/sched/core.c:4963 ret_from_fork+0x4/0x20 arch/arm64/kernel/entry.S:867 The buggy address belongs to the object at ffff0000c71e51c0 which belongs to the cache task_struct of size 6720 The buggy address is located 2328 bytes inside of 6720-byte region [ffff0000c71e51c0, ffff0000c71e6c00) The buggy address belongs to the page: page:00000000576f280a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1071e0 head:00000000576f280a order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff0000d674c401 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 0000000100000001 ffff0000c083ed80 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff0000d674c401 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c71e5980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c71e5a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000c71e5a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c71e5b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c71e5b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================