loop0: detected capacity change from 0 to 32768
bcachefs (loop0): starting version 1.7: mi_btree_bitmap opts=metadata_checksum=none,data_checksum=none,compression=lz4,journal_flush_disabled,norecovery,nojournal_transaction_names,reconstruct_alloc,no_data_io
  allowing incompatible features above 0.0: (unknown version)
  features: lz4,new_siphash,inline_data,new_extent_overwrite,btree_ptr_v2,new_varint,journal_no_flush,alloc_v2,extents_across_btree_nodes
bcachefs (loop0): Using encoding defined by superblock: utf8-12.1.0
bcachefs (loop0): recovering from clean shutdown, journal seq 10
bcachefs (loop0): Version upgrade required:
Version upgrade from 0.24: unwritten_extents to 1.7: mi_btree_bitmap incomplete
Doing incompatible version upgrade from 0.24: unwritten_extents to 1.28: inode_has_case_insensitive
  running recovery passes: check_allocations,check_alloc_info,check_lrus,check_btree_backpointers,check_backpointers_to_extents,check_extents_to_backpointers,check_alloc_to_lru_refs,bucket_gens_init,check_snapshot_trees,check_snapshots,check_subvols,check_subvol_children,delete_dead_snapshots,check_inodes,check_extents,check_indirect_extents,check_dirents,check_xattrs,check_root,check_unreachable_inodes,check_subvolume_structure,check_directory_structure,check_nlinks,check_rebalance_work,set_fs_needs_rebalance
bcachefs (loop0): dropping and reconstructing all alloc info
bcachefs (loop0): accounting_read... done
bcachefs (loop0): alloc_read... done
bcachefs (loop0): snapshots_read... done
bcachefs (loop0): done starting filesystem
bcachefs (loop0): hash table key at wrong offset: should be at 331005371
  u64s 7 type dirent 4096:189491840996961599:U32_MAX len 0 ver 0: file0 -> 4098 type dir, fixing
==================================================================
BUG: KASAN: slab-use-after-free in bch2_str_hash_repair_key+0x2d42/0x3fa0 fs/bcachefs/str_hash.c:335
Read of size 8 at addr ffff888034e19628 by task syz.0.0/5329

CPU: 0 UID: 0 PID: 5329 Comm: syz.0.0 Not tainted 6.16.0-rc1-syzkaller-00182-g18531f4d1c8c #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xd2/0x2b0 mm/kasan/report.c:521
 kasan_report+0x118/0x150 mm/kasan/report.c:634
 bch2_str_hash_repair_key+0x2d42/0x3fa0 fs/bcachefs/str_hash.c:335
 __bch2_str_hash_check_key+0xa65/0xd40 fs/bcachefs/str_hash.c:394
 bch2_str_hash_check_key fs/bcachefs/str_hash.h:429 [inline]
 bch2_readdir+0x11cd/0x16f0 fs/bcachefs/dirent.c:685
 bch2_vfs_readdir+0x4d0/0x6c0 fs/bcachefs/fs.c:1581
 iterate_dir+0x5ac/0x770 fs/readdir.c:108
 __do_sys_getdents fs/readdir.c:326 [inline]
 __se_sys_getdents+0xe4/0x250 fs/readdir.c:312
 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: 0033:0x7f9d6cd8e929
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:00007f9d6dc85038 EFLAGS: 00000246 ORIG_RAX: 000000000000004e
RAX: ffffffffffffffda RBX: 00007f9d6cfb5fa0 RCX: 00007f9d6cd8e929
RDX: 00000000000000b8 RSI: 0000200000001fc0 RDI: 0000000000000004
RBP: 00007f9d6ce10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9d6cfb5fa0 R15: 00007ffc22f01b98
 </TASK>

Allocated by task 5329:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x93/0xb0 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+0x271/0x4e0 mm/slub.c:4347
 __do_krealloc mm/slub.c:4905 [inline]
 krealloc_noprof+0x124/0x340 mm/slub.c:4958
 __bch2_trans_kmalloc+0x26c/0xc80 fs/bcachefs/btree_iter.c:3187
 bch2_trans_kmalloc_ip fs/bcachefs/btree_iter.h:604 [inline]
 bch2_trans_kmalloc fs/bcachefs/btree_iter.h:616 [inline]
 bch2_str_hash_repair_key+0x2a65/0x3fa0 fs/bcachefs/str_hash.c:251
 __bch2_str_hash_check_key+0xa65/0xd40 fs/bcachefs/str_hash.c:394
 bch2_str_hash_check_key fs/bcachefs/str_hash.h:429 [inline]
 bch2_readdir+0x11cd/0x16f0 fs/bcachefs/dirent.c:685
 bch2_vfs_readdir+0x4d0/0x6c0 fs/bcachefs/fs.c:1581
 iterate_dir+0x5ac/0x770 fs/readdir.c:108
 __do_sys_getdents fs/readdir.c:326 [inline]
 __se_sys_getdents+0xe4/0x250 fs/readdir.c:312
 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

Freed by task 5329:
 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:247 [inline]
 __kasan_slab_free+0x62/0x70 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+0x18e/0x440 mm/slub.c:4842
 krealloc_noprof+0x1cd/0x340 mm/slub.c:-1
 __bch2_trans_kmalloc+0x26c/0xc80 fs/bcachefs/btree_iter.c:3187
 bch2_trans_kmalloc_ip fs/bcachefs/btree_iter.h:604 [inline]
 bch2_trans_kmalloc fs/bcachefs/btree_iter.h:616 [inline]
 bch2_hash_delete_at fs/bcachefs/str_hash.h:364 [inline]
 bch2_str_hash_repair_key+0x2fde/0x3fa0 fs/bcachefs/str_hash.c:289
 __bch2_str_hash_check_key+0xa65/0xd40 fs/bcachefs/str_hash.c:394
 bch2_str_hash_check_key fs/bcachefs/str_hash.h:429 [inline]
 bch2_readdir+0x11cd/0x16f0 fs/bcachefs/dirent.c:685
 bch2_vfs_readdir+0x4d0/0x6c0 fs/bcachefs/fs.c:1581
 iterate_dir+0x5ac/0x770 fs/readdir.c:108
 __do_sys_getdents fs/readdir.c:326 [inline]
 __se_sys_getdents+0xe4/0x250 fs/readdir.c:312
 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

The buggy address belongs to the object at ffff888034e19600
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 40 bytes inside of
 freed 128-byte region [ffff888034e19600, ffff888034e19680)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x34e19
anon flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000000 ffff88801a441a00 ffffea00010cebc0 dead000000000005
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c00(GFP_NOIO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 11995672638, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1704
 prep_new_page mm/page_alloc.c:1712 [inline]
 get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3669
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4959
 alloc_slab_page mm/slub.c:2453 [inline]
 allocate_slab+0x65/0x3b0 mm/slub.c:2619
 new_slab mm/slub.c:2673 [inline]
 ___slab_alloc+0xbfc/0x1480 mm/slub.c:3859
 __slab_alloc mm/slub.c:3949 [inline]
 __slab_alloc_node mm/slub.c:4024 [inline]
 slab_alloc_node mm/slub.c:4185 [inline]
 __kmalloc_cache_node_noprof+0x29a/0x3d0 mm/slub.c:4367
 kmalloc_node_noprof include/linux/slab.h:928 [inline]
 blk_alloc_flush_queue+0x7f/0x230 block/blk-flush.c:483
 blk_mq_alloc_hctx block/blk-mq.c:4037 [inline]
 blk_mq_alloc_and_init_hctx+0x679/0xd60 block/blk-mq.c:4500
 __blk_mq_realloc_hw_ctxs+0x169/0x400 block/blk-mq.c:4531
 blk_mq_realloc_hw_ctxs block/blk-mq.c:4558 [inline]
 blk_mq_init_allocated_queue+0x400/0x1490 block/blk-mq.c:4590
 blk_mq_alloc_queue block/blk-mq.c:4400 [inline]
 __blk_mq_alloc_disk+0x1f6/0x340 block/blk-mq.c:4443
 nbd_dev_add+0x476/0xb00 drivers/block/nbd.c:1933
 nbd_init+0x21a/0x2d0 drivers/block/nbd.c:2670
 do_one_initcall+0x233/0x820 init/main.c:1273
 do_initcall_level+0x137/0x1f0 init/main.c:1335
 do_initcalls+0x69/0xd0 init/main.c:1351
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888034e19500: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
 ffff888034e19580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888034e19600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff888034e19680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888034e19700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================