================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x13e/0x1b0 lib/list_debug.c:49 Read of size 8 at addr ffff888017a644b0 by task kworker/u4:7/1246 CPU: 0 PID: 1246 Comm: kworker/u4:7 Not tainted 6.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Workqueue: btrfs-qgroup-rescan btrfs_work_helper Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x5c/0xb0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xc4/0x620 mm/kasan/report.c:475 kasan_report+0xda/0x110 mm/kasan/report.c:588 __list_del_entry_valid_or_report+0x13e/0x1b0 lib/list_debug.c:49 __list_del_entry_valid include/linux/list.h:124 [inline] __list_del_entry include/linux/list.h:215 [inline] list_del_init include/linux/list.h:287 [inline] qgroup_iterator_nested_clean fs/btrfs/qgroup.c:2435 [inline] btrfs_qgroup_account_extent+0x61b/0xdd0 fs/btrfs/qgroup.c:2695 qgroup_rescan_leaf+0x59e/0xbd0 fs/btrfs/qgroup.c:3271 btrfs_qgroup_rescan_worker+0x4a0/0x850 fs/btrfs/qgroup.c:3324 btrfs_work_helper+0x1bb/0x9f0 fs/btrfs/async-thread.c:315 process_one_work+0x789/0x12a0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x6fb/0x1170 kernel/workqueue.c:2784 kthread+0x2ed/0x3d0 kernel/kthread.c:388 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Allocated by task 13299: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:599 [inline] kzalloc include/linux/slab.h:720 [inline] add_qgroup_rb+0xd4/0x460 fs/btrfs/qgroup.c:203 btrfs_quota_enable+0x89a/0x16f0 fs/btrfs/qgroup.c:1149 btrfs_ioctl_quota_ctl fs/btrfs/ioctl.c:3700 [inline] btrfs_ioctl+0x42a3/0x5870 fs/btrfs/ioctl.c:4663 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x12b/0x1a0 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 13299: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1800 [inline] slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] __kmem_cache_free+0xb8/0x2f0 mm/slub.c:3822 btrfs_remove_qgroup+0x43a/0x680 fs/btrfs/qgroup.c:1664 btrfs_ioctl_qgroup_create fs/btrfs/ioctl.c:3806 [inline] btrfs_ioctl+0x4637/0x5870 fs/btrfs/ioctl.c:4667 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x12b/0x1a0 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:2653 kthread_worker_fn+0x289/0x8b0 kernel/kthread.c:823 kthread+0x2ed/0x3d0 kernel/kthread.c:388 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 Second to last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492 __call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:2653 kthread_worker_fn+0x289/0x8b0 kernel/kthread.c:823 kthread+0x2ed/0x3d0 kernel/kthread.c:388 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 The buggy address belongs to the object at ffff888017a64400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 176 bytes inside of freed 512-byte region [ffff888017a64400, ffff888017a64600) The buggy address belongs to the physical page: page:ffffea00005e9900 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17a64 head:ffffea00005e9900 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff88800d441c80 ffffea0001ec7100 dead000000000002 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 814, tgid 814 (kworker/u4:4), ts 2883418540, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1536 prep_new_page mm/page_alloc.c:1543 [inline] get_page_from_freelist+0xee0/0x2f10 mm/page_alloc.c:3170 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4426 alloc_slab_page mm/slub.c:1870 [inline] allocate_slab+0x251/0x380 mm/slub.c:2017 new_slab mm/slub.c:2070 [inline] ___slab_alloc+0x8c7/0x1580 mm/slub.c:3223 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322 __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x131/0x340 mm/slub.c:3517 kmalloc_trace+0x25/0xe0 mm/slab_common.c:1114 kmalloc include/linux/slab.h:599 [inline] kzalloc include/linux/slab.h:720 [inline] alloc_bprm+0x4c/0x9e0 fs/exec.c:1514 kernel_execve+0x83/0x450 fs/exec.c:1989 call_usermodehelper_exec_async+0x232/0x440 kernel/umh.c:110 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 page_owner free stack trace missing Memory state around the buggy address: ffff888017a64380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888017a64400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888017a64480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888017a64500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888017a64580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================