error not marked as autofix and not in fsck run fsck, and forward to devs so error can be marked for self-healing emergency read only at seq 11 ================================================================== BUG: KASAN: slab-use-after-free in bch2_bucket_alloc_trans+0x1308/0x1a7c fs/bcachefs/alloc_foreground.c:547 Read of size 8 at addr ffff0000d27b7720 by task kworker/u8:12/4493 CPU: 1 UID: 0 PID: 4493 Comm: kworker/u8:12 Not tainted 6.16.0-rc2-syzkaller-g9aa9b43d689e #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: btree_update btree_interior_update_work Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:501 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x254 mm/kasan/report.c:408 print_report+0x68/0x84 mm/kasan/report.c:521 kasan_report+0xb0/0x110 mm/kasan/report.c:634 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 bch2_bucket_alloc_trans+0x1308/0x1a7c fs/bcachefs/alloc_foreground.c:547 bch2_bucket_alloc_set_trans+0x490/0x9cc fs/bcachefs/alloc_foreground.c:728 __open_bucket_add_buckets+0x10a4/0x1954 fs/bcachefs/alloc_foreground.c:925 open_bucket_add_buckets+0x314/0x3d0 fs/bcachefs/alloc_foreground.c:957 bch2_alloc_sectors_start_trans+0xa54/0x1880 fs/bcachefs/alloc_foreground.c:-1 __bch2_btree_node_alloc fs/bcachefs/btree_update_interior.c:320 [inline] bch2_btree_reserve_get+0x4ec/0xe80 fs/bcachefs/btree_update_interior.c:534 bch2_btree_update_start+0x1130/0x1a68 fs/bcachefs/btree_update_interior.c:1270 bch2_btree_split_leaf+0x118/0x71c fs/bcachefs/btree_update_interior.c:1920 bch2_trans_commit_error+0x17c/0x11a0 fs/bcachefs/btree_trans_commit.c:911 __bch2_trans_commit+0x1888/0x6198 fs/bcachefs/btree_trans_commit.c:1098 bch2_trans_commit fs/bcachefs/btree_update.h:242 [inline] btree_update_nodes_written fs/bcachefs/btree_update_interior.c:729 [inline] btree_interior_update_work+0xb98/0x1d28 fs/bcachefs/btree_update_interior.c:867 process_one_work+0x7e8/0x155c kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3402 kthread+0x5fc/0x75c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 Allocated by task 4493: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4328 [inline] __kmalloc_node_track_caller_noprof+0x304/0x4d0 mm/slub.c:4347 __do_krealloc mm/slub.c:4905 [inline] krealloc_noprof+0x11c/0x2f0 mm/slub.c:4958 __bch2_trans_kmalloc+0x1f4/0xb8c fs/bcachefs/btree_iter.c:3187 bch2_trans_kmalloc_nomemzero_ip fs/bcachefs/btree_iter.h:586 [inline] bch2_trans_kmalloc_nomemzero+0xf8/0x150 fs/bcachefs/btree_iter.h:621 __bch2_trans_subbuf_alloc+0xe0/0x2a0 fs/bcachefs/btree_update.c:557 bch2_trans_subbuf_alloc fs/bcachefs/btree_update.h:148 [inline] bch2_disk_accounting_mod+0x478/0xe88 fs/bcachefs/disk_accounting.c:128 bch2_dev_data_type_accounting_mod fs/bcachefs/alloc_background.c:812 [inline] bch2_alloc_key_to_dev_counters+0x540/0x9b8 fs/bcachefs/alloc_background.c:828 bch2_trigger_alloc+0x1538/0x2d68 fs/bcachefs/alloc_background.c:944 run_one_trans_trigger fs/bcachefs/btree_trans_commit.c:-1 [inline] bch2_trans_commit_run_triggers fs/bcachefs/btree_trans_commit.c:554 [inline] __bch2_trans_commit+0x7c8/0x6198 fs/bcachefs/btree_trans_commit.c:1019 bch2_trans_commit fs/bcachefs/btree_update.h:242 [inline] btree_update_nodes_written fs/bcachefs/btree_update_interior.c:729 [inline] btree_interior_update_work+0xb98/0x1d28 fs/bcachefs/btree_update_interior.c:867 process_one_work+0x7e8/0x155c kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3402 kthread+0x5fc/0x75c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 Freed by task 4493: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x68/0x88 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kfree+0x17c/0x474 mm/slub.c:4842 krealloc_noprof+0x214/0x2f0 mm/slub.c:-1 __bch2_trans_kmalloc+0x1f4/0xb8c fs/bcachefs/btree_iter.c:3187 bch2_trans_kmalloc_nomemzero_ip fs/bcachefs/btree_iter.h:586 [inline] bch2_trans_kmalloc_nomemzero+0xf8/0x150 fs/bcachefs/btree_iter.h:621 __bch2_trans_subbuf_alloc+0xe0/0x2a0 fs/bcachefs/btree_update.c:557 bch2_trans_subbuf_alloc fs/bcachefs/btree_update.h:148 [inline] bch2_trans_jset_entry_alloc fs/bcachefs/btree_update.h:168 [inline] __bch2_trans_log_str fs/bcachefs/btree_update.c:814 [inline] bch2_trans_log_str+0xb4/0x308 fs/bcachefs/btree_update.c:827 __bch2_fsck_err+0x94c/0xe68 fs/bcachefs/error.c:625 bch2_check_discard_freespace_key+0x468/0xb14 fs/bcachefs/alloc_background.c:1422 try_alloc_bucket fs/bcachefs/alloc_foreground.c:272 [inline] bch2_bucket_alloc_freelist fs/bcachefs/alloc_foreground.c:420 [inline] bch2_bucket_alloc_trans+0xcec/0x1a7c fs/bcachefs/alloc_foreground.c:544 bch2_bucket_alloc_set_trans+0x490/0x9cc fs/bcachefs/alloc_foreground.c:728 __open_bucket_add_buckets+0x10a4/0x1954 fs/bcachefs/alloc_foreground.c:925 open_bucket_add_buckets+0x314/0x3d0 fs/bcachefs/alloc_foreground.c:957 bch2_alloc_sectors_start_trans+0xa54/0x1880 fs/bcachefs/alloc_foreground.c:-1 __bch2_btree_node_alloc fs/bcachefs/btree_update_interior.c:320 [inline] bch2_btree_reserve_get+0x4ec/0xe80 fs/bcachefs/btree_update_interior.c:534 bch2_btree_update_start+0x1130/0x1a68 fs/bcachefs/btree_update_interior.c:1270 bch2_btree_split_leaf+0x118/0x71c fs/bcachefs/btree_update_interior.c:1920 bch2_trans_commit_error+0x17c/0x11a0 fs/bcachefs/btree_trans_commit.c:911 __bch2_trans_commit+0x1888/0x6198 fs/bcachefs/btree_trans_commit.c:1098 bch2_trans_commit fs/bcachefs/btree_update.h:242 [inline] btree_update_nodes_written fs/bcachefs/btree_update_interior.c:729 [inline] btree_interior_update_work+0xb98/0x1d28 fs/bcachefs/btree_update_interior.c:867 process_one_work+0x7e8/0x155c kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3402 kthread+0x5fc/0x75c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 The buggy address belongs to the object at ffff0000d27b7000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1824 bytes inside of freed 2048-byte region [ffff0000d27b7000, ffff0000d27b7800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1127b0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c0002000 0000000000000000 0000000000000001 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c0002000 0000000000000000 0000000000000001 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc349ec01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d27b7600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d27b7680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000d27b7700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d27b7780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d27b7800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================