loop4: detected capacity change from 0 to 32768
==================================================================
BUG: KASAN: slab-use-after-free in ciCompare fs/jfs/jfs_dtree.c:3428 [inline]
BUG: KASAN: slab-use-after-free in dtSearch+0x16b4/0x21b0 fs/jfs/jfs_dtree.c:645
Read of size 1 at addr ffff888062bc84a4 by task syz.4.970/16854

CPU: 0 UID: 0 PID: 16854 Comm: syz.4.970 Tainted: G        W           6.17.0-rc1-syzkaller-00224-g8d561baae505 #0 PREEMPT_{RT,(full)} 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 ciCompare fs/jfs/jfs_dtree.c:3428 [inline]
 dtSearch+0x16b4/0x21b0 fs/jfs/jfs_dtree.c:645
 jfs_lookup+0x155/0x380 fs/jfs/namei.c:1461
 lookup_open fs/namei.c:3686 [inline]
 open_last_lookups fs/namei.c:3807 [inline]
 path_openat+0x110a/0x3840 fs/namei.c:4043
 do_filp_open+0x1fa/0x410 fs/namei.c:4073
 do_sys_openat2+0x121/0x1c0 fs/open.c:1435
 do_sys_open fs/open.c:1450 [inline]
 __do_sys_openat fs/open.c:1466 [inline]
 __se_sys_openat fs/open.c:1461 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1461
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ffb9913ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffb973a6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffb99365fa0 RCX: 00007ffb9913ebe9
RDX: 0000000000143041 RSI: 0000200000000040 RDI: ffffffffffffff9c
RBP: 00007ffb991c1e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffb99366038 R14: 00007ffb99365fa0 R15: 00007ffdfa2960b8
 </TASK>

Allocated by task 16161:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:330 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:356
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4180 [inline]
 slab_alloc_node mm/slub.c:4229 [inline]
 kmem_cache_alloc_lru_noprof+0x14c/0x310 mm/slub.c:4248
 xas_alloc lib/xarray.c:378 [inline]
 xas_create+0x1177/0x1ba0 lib/xarray.c:685
 xas_store+0x9a/0x1880 lib/xarray.c:795
 __xa_cmpxchg_raw lib/xarray.c:1782 [inline]
 __xa_cmpxchg+0xdf/0x1f0 lib/xarray.c:1766
 xa_cmpxchg include/linux/xarray.h:699 [inline]
 xa_reserve include/linux/xarray.h:1088 [inline]
 add_delayed_ref+0x36e/0x1d80 fs/btrfs/delayed-ref.c:1029
 btrfs_alloc_tree_block+0xd4b/0x1290 fs/btrfs/extent-tree.c:5219
 btrfs_force_cow_block+0x578/0x2460 fs/btrfs/ctree.c:517
 btrfs_cow_block+0x40a/0x9a0 fs/btrfs/ctree.c:699
 btrfs_search_slot+0xd17/0x2ba0 fs/btrfs/ctree.c:2097
 btrfs_lookup_inode+0xc1/0x460 fs/btrfs/inode-item.c:395
 __btrfs_update_delayed_inode+0x167/0xf00 fs/btrfs/delayed-inode.c:1005
 btrfs_update_delayed_inode fs/btrfs/delayed-inode.c:1091 [inline]
 __btrfs_commit_inode_delayed_items+0x1cbb/0x1e20 fs/btrfs/delayed-inode.c:1114
 __btrfs_run_delayed_items+0x215/0x540 fs/btrfs/delayed-inode.c:1148
 btrfs_commit_transaction+0x865/0x3950 fs/btrfs/transaction.c:2328
 sync_filesystem+0x1ce/0x250 fs/sync.c:66
 generic_shutdown_super+0x6f/0x2c0 fs/super.c:622
 kill_anon_super+0x3b/0x70 fs/super.c:1282
 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2114
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1378
 task_work_run+0x1d1/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 28:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:243 [inline]
 __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2417 [inline]
 slab_free mm/slub.c:4680 [inline]
 kmem_cache_free+0x195/0x510 mm/slub.c:4782
 rcu_do_batch kernel/rcu/tree.c:2605 [inline]
 rcu_core kernel/rcu/tree.c:2861 [inline]
 rcu_cpu_kthread+0xbf3/0x1b50 kernel/rcu/tree.c:2949
 smpboot_thread_fn+0x542/0xa60 kernel/smpboot.c:160
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Last potentially related work creation:
 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:548
 __call_rcu_common kernel/rcu/tree.c:3123 [inline]
 call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3243
 xa_node_free lib/xarray.c:260 [inline]
 xas_delete_node lib/xarray.c:503 [inline]
 update_node lib/xarray.c:767 [inline]
 xas_store+0xe8c/0x1880 lib/xarray.c:852
 __xa_erase lib/xarray.c:1649 [inline]
 xa_erase+0x6a/0xf0 lib/xarray.c:1670
 btrfs_delete_ref_head+0x141/0x2c0 fs/btrfs/delayed-ref.c:542
 cleanup_ref_head fs/btrfs/extent-tree.c:1888 [inline]
 __btrfs_run_delayed_refs+0x2f9f/0x4150 fs/btrfs/extent-tree.c:2059
 btrfs_run_delayed_refs+0x191/0x3b0 fs/btrfs/extent-tree.c:2159
 btrfs_commit_transaction+0xf2b/0x3950 fs/btrfs/transaction.c:2433
 sync_filesystem+0x1ce/0x250 fs/sync.c:66
 generic_shutdown_super+0x6f/0x2c0 fs/super.c:622
 kill_anon_super+0x3b/0x70 fs/super.c:1282
 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2114
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1378
 task_work_run+0x1d1/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888062bc82c0
 which belongs to the cache radix_tree_node of size 576
The buggy address is located 484 bytes inside of
 freed 576-byte region [ffff888062bc82c0, ffff888062bc8500)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x62bc8
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88803b99a201
flags: 0x80000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000040 ffff88801984bdc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000170017 00000000f5000000 ffff88803b99a201
head: 0080000000000040 ffff88801984bdc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000000170017 00000000f5000000 ffff88803b99a201
head: 0080000000000002 ffffea00018af201 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Reclaimable, gfp_mask 0x52810(GFP_NOWAIT|__GFP_RECLAIMABLE|__GFP_NORETRY|__GFP_COMP), pid 6101, tgid 6101 (syz-executor), ts 88621231304, free_ts 88086762925
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851
 prep_new_page mm/page_alloc.c:1859 [inline]
 get_page_from_freelist+0x2119/0x21b0 mm/page_alloc.c:3858
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148
 alloc_pages_mpol+0xd1/0x380 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:2487 [inline]
 allocate_slab+0x8a/0x370 mm/slub.c:2655
 new_slab mm/slub.c:2709 [inline]
 ___slab_alloc+0x8d1/0xdd0 mm/slub.c:3891
 __slab_alloc mm/slub.c:3981 [inline]
 __slab_alloc_node mm/slub.c:4056 [inline]
 slab_alloc_node mm/slub.c:4217 [inline]
 kmem_cache_alloc_lru_noprof+0xea/0x310 mm/slub.c:4248
 xas_alloc lib/xarray.c:378 [inline]
 xas_create+0x1177/0x1ba0 lib/xarray.c:685
 xas_store+0x9a/0x1880 lib/xarray.c:795
 __xa_store+0xe9/0x210 lib/xarray.c:1703
 xa_store_irq include/linux/xarray.h:623 [inline]
 ref_tracker_dir_debugfs+0x1ca/0x270 lib/ref_tracker.c:447
 ref_tracker_dir_init include/linux/ref_tracker.h:70 [inline]
 alloc_netdev_mqs+0x274/0x11c0 net/core/dev.c:11807
 loopback_net_init+0x3a/0x150 drivers/net/loopback.c:213
 ops_init+0x35c/0x5c0 net/core/net_namespace.c:136
 setup_net+0x10c/0x320 net/core/net_namespace.c:438
 copy_net_ns+0x31b/0x4d0 net/core/net_namespace.c:570
page last free pid 5842 tgid 5842 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xb59/0xce0 mm/page_alloc.c:2895
 free_large_kmalloc+0x13a/0x1f0 mm/slub.c:4805
 btree_bounce_free fs/bcachefs/btree_io.c:115 [inline]
 btree_node_sort+0x117f/0x1760 fs/bcachefs/btree_io.c:383
 bch2_btree_post_write_cleanup+0x11f/0xad0 fs/bcachefs/btree_io.c:2607
 bch2_btree_node_write_trans+0x17b/0x760 fs/bcachefs/btree_io.c:2676
 btree_node_write_if_need fs/bcachefs/btree_io.h:167 [inline]
 __btree_node_flush+0x323/0x430 fs/bcachefs/btree_trans_commit.c:255
 bch2_btree_node_flush1+0x2a/0x40 fs/bcachefs/btree_trans_commit.c:269
 journal_flush_pins+0x8e3/0xe90 fs/bcachefs/journal_reclaim.c:604
 journal_flush_pins_or_still_flushing fs/bcachefs/journal_reclaim.c:871 [inline]
 journal_flush_done+0x112/0x810 fs/bcachefs/journal_reclaim.c:889
 bch2_journal_flush_pins+0x155/0x250 fs/bcachefs/journal_reclaim.c:921
 bch2_journal_flush_all_pins fs/bcachefs/journal_reclaim.h:76 [inline]
 __bch2_fs_read_only+0x144/0x5b0 fs/bcachefs/super.c:291
 bch2_fs_read_only+0x42a/0xb00 fs/bcachefs/super.c:366
 __bch2_fs_stop+0x100/0x900 fs/bcachefs/super.c:677
 generic_shutdown_super+0x132/0x2c0 fs/super.c:643
 bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2618
 deactivate_locked_super+0xbc/0x130 fs/super.c:474

Memory state around the buggy address:
 ffff888062bc8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888062bc8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888062bc8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff888062bc8500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888062bc8580: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================