loop5: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-out-of-bounds in members_v2_get fs/bcachefs/sb-members.c:68 [inline] BUG: KASAN: slab-out-of-bounds in bch2_sb_members_v2_to_text+0x1ae/0x310 fs/bcachefs/sb-members.c:347 Read of size 136 at addr ffff8880477a5fb8 by task syz.5.2751/16612 CPU: 0 UID: 0 PID: 16612 Comm: syz.5.2751 Not tainted 6.15.0-rc7-next-20250522-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: 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 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:189 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 members_v2_get fs/bcachefs/sb-members.c:68 [inline] bch2_sb_members_v2_to_text+0x1ae/0x310 fs/bcachefs/sb-members.c:347 bch2_sb_field_validate+0x1c6/0x280 fs/bcachefs/super-io.c:1380 bch2_sb_validate+0x14bd/0x1980 fs/bcachefs/super-io.c:552 __bch2_read_super+0xba4/0x1040 fs/bcachefs/super-io.c:925 bch2_fs_open+0x1fe/0x25c0 fs/bcachefs/super.c:2371 bch2_fs_get_tree+0x44d/0x15f0 fs/bcachefs/fs.c:2491 vfs_get_tree+0x92/0x2b0 fs/super.c:1802 do_new_mount+0x24a/0xa40 fs/namespace.c:3869 do_mount fs/namespace.c:4206 [inline] __do_sys_mount fs/namespace.c:4417 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4394 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: 0033:0x7f6ac979010a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6aca658e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f6aca658ef0 RCX: 00007f6ac979010a RDX: 00002000000000c0 RSI: 0000200000000300 RDI: 00007f6aca658eb0 RBP: 00002000000000c0 R08: 00007f6aca658ef0 R09: 0000000000000010 R10: 0000000000000010 R11: 0000000000000246 R12: 0000200000000300 R13: 00007f6aca658eb0 R14: 00000000000059e1 R15: 0000200000000280 Allocated by task 16612: 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:4327 [inline] __kmalloc_node_track_caller_noprof+0x271/0x4e0 mm/slub.c:4346 __do_krealloc mm/slub.c:4904 [inline] krealloc_noprof+0x124/0x340 mm/slub.c:4957 bch2_sb_realloc+0x348/0x630 fs/bcachefs/super-io.c:222 read_one_super+0x3a3/0x850 fs/bcachefs/super-io.c:759 __bch2_read_super+0x6c6/0x1040 fs/bcachefs/super-io.c:851 bch2_fs_open+0x1fe/0x25c0 fs/bcachefs/super.c:2371 bch2_fs_get_tree+0x44d/0x15f0 fs/bcachefs/fs.c:2491 vfs_get_tree+0x92/0x2b0 fs/super.c:1802 do_new_mount+0x24a/0xa40 fs/namespace.c:3869 do_mount fs/namespace.c:4206 [inline] __do_sys_mount fs/namespace.c:4417 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4394 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 ffff8880477a4000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 8120 bytes inside of allocated 8192-byte region [ffff8880477a4000, ffff8880477a6000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x477a0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801a442280 ffffea00018cf000 dead000000000002 raw: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801a442280 ffffea00018cf000 dead000000000002 head: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea00011de801 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 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 9872, tgid 9864 (syz.1.1196), ts 428430511129, free_ts 423222929619 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_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2419 alloc_slab_page mm/slub.c:2450 [inline] allocate_slab+0x8a/0x3b0 mm/slub.c:2618 new_slab mm/slub.c:2672 [inline] ___slab_alloc+0xbfc/0x1480 mm/slub.c:3858 __slab_alloc mm/slub.c:3948 [inline] __slab_alloc_node mm/slub.c:4023 [inline] slab_alloc_node mm/slub.c:4184 [inline] __do_kmalloc_node mm/slub.c:4326 [inline] __kmalloc_node_track_caller_noprof+0x2f8/0x4e0 mm/slub.c:4346 __do_krealloc mm/slub.c:4904 [inline] krealloc_noprof+0x124/0x340 mm/slub.c:4957 copy_array+0x63/0xf0 kernel/bpf/verifier.c:1381 copy_stack_state kernel/bpf/verifier.c:1441 [inline] copy_func_state kernel/bpf/verifier.c:1727 [inline] copy_verifier_state+0x848/0xed0 kernel/bpf/verifier.c:1768 is_state_visited kernel/bpf/verifier.c:19299 [inline] do_check+0x4c44/0xd450 kernel/bpf/verifier.c:19461 do_check_common+0x168d/0x20b0 kernel/bpf/verifier.c:22806 do_check_main kernel/bpf/verifier.c:22897 [inline] bpf_check+0x13664/0x19c60 kernel/bpf/verifier.c:24063 bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2972 __sys_bpf+0x5f1/0x860 kernel/bpf/syscall.c:5836 __do_sys_bpf kernel/bpf/syscall.c:5943 [inline] __se_sys_bpf kernel/bpf/syscall.c:5941 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5941 page last free pid 9828 tgid 9822 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706 discard_slab mm/slub.c:2716 [inline] __put_partials+0x161/0x1c0 mm/slub.c:3185 put_cpu_partial+0x17c/0x250 mm/slub.c:3260 __slab_free+0x2f7/0x400 mm/slub.c:4512 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4147 [inline] slab_alloc_node mm/slub.c:4196 [inline] kmem_cache_alloc_lru_noprof+0x1c6/0x3d0 mm/slub.c:4215 __d_alloc+0x31/0x6f0 fs/dcache.c:1690 d_alloc_pseudo+0x1f/0xb0 fs/dcache.c:1821 alloc_path_pseudo fs/file_table.c:362 [inline] alloc_file_pseudo+0xcc/0x210 fs/file_table.c:378 __anon_inode_getfile fs/anon_inodes.c:153 [inline] anon_inode_getfile+0xc5/0x1a0 fs/anon_inodes.c:191 bpf_link_prime+0xfc/0x220 kernel/bpf/syscall.c:3319 cgroup_bpf_link_attach+0x1cc/0x3d0 kernel/bpf/cgroup.c:1332 link_create+0x539/0x8a0 kernel/bpf/syscall.c:-1 __sys_bpf+0x599/0x860 kernel/bpf/syscall.c:5906 Memory state around the buggy address: ffff8880477a5f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880477a5f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880477a6000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880477a6080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880477a6100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================