================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4881 Read of size 8 at addr ffff88807d0045a8 by task kworker/u4:4/1239 CPU: 0 PID: 1239 Comm: kworker/u4:4 Not tainted 5.15.120-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+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 __lock_acquire+0x74/0x1ff0 kernel/locking/lockdep.c:4881 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __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+0xae/0x1300 kernel/sched/core.c:4026 async_cow_free+0x4d/0x350 fs/btrfs/inode.c:1384 run_ordered_work fs/btrfs/async-thread.c:298 [inline] btrfs_work_helper+0x8ed/0xba0 fs/btrfs/async-thread.c:335 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2307 worker_thread+0xaca/0x1280 kernel/workqueue.c:2454 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 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+0x8e/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct+0x57/0xb60 kernel/fork.c:886 copy_process+0x5eb/0x3ef0 kernel/fork.c:2030 kernel_clone+0x210/0x960 kernel/fork.c:2601 kernel_thread+0x168/0x1e0 kernel/fork.c:2653 create_kthread kernel/kthread.c:342 [inline] kthreadd+0x57d/0x740 kernel/kthread.c:686 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Freed by task 20: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kmem_cache_free+0x91/0x1f0 mm/slub.c:3515 rcu_do_batch kernel/rcu/tree.c:2510 [inline] rcu_core+0xa15/0x1650 kernel/rcu/tree.c:2750 __do_softirq+0x3b3/0x93a kernel/softirq.c:558 Last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2994 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3074 context_switch kernel/sched/core.c:5029 [inline] __schedule+0x12cc/0x4590 kernel/sched/core.c:6372 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6548 preempt_schedule+0xd9/0xe0 kernel/sched/core.c:6573 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34 try_to_wake_up+0x8a8/0x1300 kernel/sched/core.c:4148 kthread_stop+0x164/0x580 kernel/kthread.c:647 close_ctree+0x4e6/0x886 fs/btrfs/disk-io.c:4450 generic_shutdown_super+0x136/0x2c0 fs/super.c:475 kill_anon_super+0x37/0x60 fs/super.c:1067 btrfs_kill_super+0x3d/0x50 fs/btrfs/super.c:2391 deactivate_locked_super+0xa0/0x110 fs/super.c:335 cleanup_mnt+0x44e/0x500 fs/namespace.c:1143 task_work_run+0x129/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0x106/0x130 kernel/entry/common.c:175 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x5d/0x250 kernel/entry/common.c:301 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x61/0xcb Second to last potentially related work creation: kasan_save_stack+0x36/0x60 mm/kasan/common.c:38 kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2994 [inline] call_rcu+0x1c4/0xa70 kernel/rcu/tree.c:3074 context_switch kernel/sched/core.c:5029 [inline] __schedule+0x12cc/0x4590 kernel/sched/core.c:6372 schedule+0x11b/0x1f0 kernel/sched/core.c:6455 schedule_hrtimeout_range_clock+0x27f/0x470 kernel/time/hrtimer.c:2307 jbd2_journal_stop+0x695/0xd70 fs/jbd2/transaction.c:1910 __ext4_journal_stop+0xf8/0x190 fs/ext4/ext4_jbd2.c:127 ext4_rmdir+0x8fb/0xa80 fs/ext4/namei.c:3223 vfs_rmdir+0x305/0x460 fs/namei.c:4078 do_rmdir+0x362/0x670 fs/namei.c:4139 __do_sys_unlinkat fs/namei.c:4319 [inline] __se_sys_unlinkat fs/namei.c:4313 [inline] __x64_sys_unlinkat+0xdc/0xf0 fs/namei.c:4313 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+0x61/0xcb The buggy address belongs to the object at ffff88807d003b80 which belongs to the cache task_struct of size 7360 The buggy address is located 2600 bytes inside of 7360-byte region [ffff88807d003b80, ffff88807d005840) The buggy address belongs to the page: page:ffffea0001f40000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d000 head:ffffea0001f40000 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888023c18381 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888140006280 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff888023c18381 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 3334, ts 30855499462, free_ts 30842000263 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159 __alloc_pages+0x272/0x700 mm/page_alloc.c:5421 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] kmem_cache_alloc_node+0x1ba/0x2c0 mm/slub.c:3256 alloc_task_struct_node kernel/fork.c:171 [inline] dup_task_struct+0x57/0xb60 kernel/fork.c:886 copy_process+0x5eb/0x3ef0 kernel/fork.c:2030 kernel_clone+0x210/0x960 kernel/fork.c:2601 __do_sys_clone kernel/fork.c:2718 [inline] __se_sys_clone kernel/fork.c:2702 [inline] __x64_sys_clone+0x23f/0x290 kernel/fork.c:2702 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+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 free_slab mm/slub.c:2015 [inline] discard_slab mm/slub.c:2021 [inline] __unfreeze_partials+0x1b7/0x210 mm/slub.c:2507 put_cpu_partial+0x132/0x1a0 mm/slub.c:2587 do_slab_free mm/slub.c:3487 [inline] ___cache_free+0xe3/0x100 mm/slub.c:3506 qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] __kmalloc_track_caller+0x11e/0x300 mm/slub.c:4925 __do_krealloc mm/slab_common.c:1217 [inline] krealloc+0x4b/0xc0 mm/slab_common.c:1250 ima_collect_measurement+0x343/0x530 security/integrity/ima/ima_api.c:260 process_measurement+0x1038/0x1d60 security/integrity/ima/ima_main.c:337 ima_bprm_check+0x127/0x2b0 security/integrity/ima/ima_main.c:494 search_binary_handler fs/exec.c:1722 [inline] exec_binprm fs/exec.c:1775 [inline] bprm_execve+0x84e/0x17c0 fs/exec.c:1844 do_execveat_common+0x583/0x720 fs/exec.c:1949 Memory state around the buggy address: ffff88807d004480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d004500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807d004580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807d004600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d004680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================