bcachefs (loop1): done starting filesystem ================================================================== BUG: KASAN: slab-out-of-bounds in bch2_dirent_init_name+0x396/0x8b0 fs/bcachefs/dirent.c:276 Write of size 1985 at addr ffff888021ef722d by task syz.1.248/7826 CPU: 0 UID: 0 PID: 7826 Comm: syz.1.248 Tainted: G W 6.16.0-syzkaller-10910-g0905809b38bd #0 PREEMPT_{RT,(full)} Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: 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 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189 __asan_memset+0x22/0x50 mm/kasan/shadow.c:84 bch2_dirent_init_name+0x396/0x8b0 fs/bcachefs/dirent.c:276 bch2_dirent_create_key+0x2a1/0x5f0 fs/bcachefs/dirent.c:319 bch2_dirent_create+0xc5/0xc80 fs/bcachefs/dirent.c:362 bch2_link_trans+0x39e/0x560 fs/bcachefs/namei.c:241 __bch2_link+0x231/0x3f0 fs/bcachefs/fs.c:776 bch2_symlink+0x183/0x240 fs/bcachefs/fs.c:892 vfs_symlink+0x140/0x2f0 fs/namei.c:4730 do_symlinkat+0x1b1/0x3f0 fs/namei.c:4756 __do_sys_symlink fs/namei.c:4777 [inline] __se_sys_symlink fs/namei.c:4775 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4775 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: 0033:0x7f9df380eb69 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:00007f9df1676038 EFLAGS: 00000246 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 00007f9df3a35fa0 RCX: 00007f9df380eb69 RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000200000000440 RBP: 00007f9df3891df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9df3a35fa0 R15: 00007ffe43033e58 Allocated by task 7826: 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:4365 [inline] __kmalloc_noprof+0x1ef/0x430 mm/slub.c:4377 kmalloc_noprof include/linux/slab.h:909 [inline] __bch2_trans_kmalloc+0x395/0x9d0 fs/bcachefs/btree_iter.c:3242 bch2_trans_kmalloc_ip fs/bcachefs/btree_iter.h:604 [inline] bch2_trans_kmalloc fs/bcachefs/btree_iter.h:616 [inline] bch2_dirent_create_key+0x113/0x5f0 fs/bcachefs/dirent.c:302 bch2_dirent_create+0xc5/0xc80 fs/bcachefs/dirent.c:362 bch2_link_trans+0x39e/0x560 fs/bcachefs/namei.c:241 __bch2_link+0x231/0x3f0 fs/bcachefs/fs.c:776 bch2_symlink+0x183/0x240 fs/bcachefs/fs.c:892 vfs_symlink+0x140/0x2f0 fs/namei.c:4730 do_symlinkat+0x1b1/0x3f0 fs/namei.c:4756 __do_sys_symlink fs/namei.c:4777 [inline] __se_sys_symlink fs/namei.c:4775 [inline] __x64_sys_symlink+0x7a/0x90 fs/namei.c:4775 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 ffff888021ef7000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 557 bytes inside of allocated 2048-byte region [ffff888021ef7000, ffff888021ef7800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21ef0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x80000000000040(head|node=0|zone=1) page_type: f5(slab) raw: 0080000000000040 ffff888019842000 0000000000000000 dead000000000001 raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 head: 0080000000000040 ffff888019842000 0000000000000000 dead000000000001 head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000 head: 0080000000000003 ffffea000087bc01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 2772307401, free_ts 0 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] __kmalloc_cache_noprof+0xe6/0x320 mm/slub.c:4391 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] acpi_ds_create_walk_state+0xd9/0x270 drivers/acpi/acpica/dswstate.c:518 acpi_ds_auto_serialize_method+0xe3/0x240 drivers/acpi/acpica/dsmethod.c:81 acpi_ds_init_one_object+0x172/0x380 drivers/acpi/acpica/dsinit.c:110 acpi_ns_walk_namespace+0x268/0x690 drivers/acpi/acpica/nswalk.c:-1 acpi_ds_initialize_objects+0x12c/0x1d0 drivers/acpi/acpica/dsinit.c:189 acpi_ns_load_table+0x101/0x130 drivers/acpi/acpica/nsload.c:106 acpi_tb_load_namespace+0x27c/0x6c0 drivers/acpi/acpica/tbxfload.c:158 acpi_load_tables+0x31/0xb0 drivers/acpi/acpica/tbxfload.c:59 acpi_bus_init+0x8e/0x550 drivers/acpi/bus.c:1343 page_owner free stack trace missing Memory state around the buggy address: ffff888021ef7700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888021ef7780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888021ef7800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888021ef7880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888021ef7900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================