bcachefs (loop0): dropping and reconstructing all alloc info
==================================================================
BUG: KASAN: slab-out-of-bounds in crc64_be+0x131/0x1f0 lib/crc64.c:58
Read of size 1 at addr ffff888049ee0138 by task syz-executor560/5303

CPU: 0 UID: 0 PID: 5303 Comm: syz-executor560 Not tainted 6.14.0-rc5-syzkaller-00137-g00a7d39898c8 #0
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 lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0x16e/0x5b0 mm/kasan/report.c:521
 kasan_report+0x143/0x180 mm/kasan/report.c:634
 crc64_be+0x131/0x1f0 lib/crc64.c:58
 bch2_checksum_update+0x10f/0x160 fs/bcachefs/checksum.c:89
 bch2_checksum+0x37e/0x780 fs/bcachefs/checksum.c:226
 bch2_btree_node_read_done+0x155c/0x6180 fs/bcachefs/btree_io.c:1100
 btree_node_read_work+0x6dc/0x1380 fs/bcachefs/btree_io.c:1358
 bch2_btree_node_read+0x2433/0x29f0
 __bch2_btree_root_read fs/bcachefs/btree_io.c:1789 [inline]
 bch2_btree_root_read+0x626/0x7b0 fs/bcachefs/btree_io.c:1811
 read_btree_roots+0x3d3/0xa70 fs/bcachefs/recovery.c:581
 bch2_fs_recovery+0x260f/0x3de0 fs/bcachefs/recovery.c:928
 bch2_fs_start+0x37c/0x610 fs/bcachefs/super.c:1041
 bch2_fs_get_tree+0xdb7/0x17a0 fs/bcachefs/fs.c:2203
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3560
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd9e4ec3e2a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc95e70f28 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc95e70f40 RCX: 00007fd9e4ec3e2a
RDX: 00004000000000c0 RSI: 0000400000000000 RDI: 00007ffc95e70f40
RBP: 0000400000000000 R08: 00007ffc95e70f80 R09: 0000000000005950
R10: 000000000100000a R11: 0000000000000282 R12: 00004000000000c0
R13: 00007ffc95e70f80 R14: 0000000000000003 R15: 000000000100000a
 </TASK>

Allocated by task 5303:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:319 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345
 kasan_slab_alloc include/linux/kasan.h:250 [inline]
 slab_post_alloc_hook mm/slub.c:4115 [inline]
 slab_alloc_node mm/slub.c:4164 [inline]
 kmem_cache_alloc_lru_noprof+0x1dd/0x390 mm/slub.c:4183
 __d_alloc+0x31/0x740 fs/dcache.c:1664
 d_alloc fs/dcache.c:1743 [inline]
 d_alloc_parallel+0xdf/0x1630 fs/dcache.c:2507
 __lookup_slow+0x117/0x400 fs/namei.c:1778
 lookup_one_len+0x1ef/0x300 fs/namei.c:2907
 start_creating+0x187/0x310 fs/debugfs/inode.c:391
 __debugfs_create_file+0x7d/0x500 fs/debugfs/inode.c:437
 debugfs_create_file_full+0x40/0x60 fs/debugfs/inode.c:474
 bch2_fs_debug_btree_init fs/bcachefs/debug.c:895 [inline]
 bch2_fs_debug_init+0x38d/0x450 fs/bcachefs/debug.c:938
 bch2_fs_online+0x28e/0x860 fs/bcachefs/super.c:712
 bch2_fs_alloc fs/bcachefs/super.c:955 [inline]
 bch2_fs_open+0x3175/0x31e0 fs/bcachefs/super.c:2064
 bch2_fs_get_tree+0x738/0x17a0 fs/bcachefs/fs.c:2190
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3560
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888049ee0000
 which belongs to the cache dentry of size 312
The buggy address is located 0 bytes to the right of
 allocated 312-byte region [ffff888049ee0000, ffff888049ee0138)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x49ee0
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000040 ffff8880304088c0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080150015 00000000f5000000 0000000000000000
head: 04fff00000000040 ffff8880304088c0 dead000000000122 0000000000000000
head: 0000000000000000 0000000080150015 00000000f5000000 0000000000000000
head: 04fff00000000001 ffffea000127b801 ffffffffffffffff 0000000000000000
head: 0000000000000002 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Reclaimable, gfp_mask 0xd20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 5303, tgid 5303 (syz-executor560), ts 68231850871, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551
 prep_new_page mm/page_alloc.c:1559 [inline]
 get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739
 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:2423 [inline]
 allocate_slab+0x8f/0x3a0 mm/slub.c:2587
 new_slab mm/slub.c:2640 [inline]
 ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826
 __slab_alloc+0x58/0xa0 mm/slub.c:3916
 __slab_alloc_node mm/slub.c:3991 [inline]
 slab_alloc_node mm/slub.c:4152 [inline]
 kmem_cache_alloc_lru_noprof+0x26c/0x390 mm/slub.c:4183
 __d_alloc+0x31/0x740 fs/dcache.c:1664
 d_alloc fs/dcache.c:1743 [inline]
 d_alloc_parallel+0xdf/0x1630 fs/dcache.c:2507
 __lookup_slow+0x117/0x400 fs/namei.c:1778
 lookup_one_len+0x1ef/0x300 fs/namei.c:2907
 start_creating+0x187/0x310 fs/debugfs/inode.c:391
 __debugfs_create_file+0x7d/0x500 fs/debugfs/inode.c:437
 debugfs_create_file_full+0x40/0x60 fs/debugfs/inode.c:474
 bch2_fs_debug_btree_init fs/bcachefs/debug.c:895 [inline]
 bch2_fs_debug_init+0x38d/0x450 fs/bcachefs/debug.c:938
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888049ee0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888049ee0080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888049ee0100: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc 00
                                        ^
 ffff888049ee0180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888049ee0200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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