loop0: detected capacity change from 0 to 32768 ================================================================== BUG: KASAN: slab-out-of-bounds in members_v1_get fs/bcachefs/sb-members.c:81 [inline] BUG: KASAN: slab-out-of-bounds in bch2_sb_members_v1_to_text+0x1b2/0x2b0 fs/bcachefs/sb-members.c:334 Read of size 56 at addr ffff888079096000 by task syz.0.289/6637 CPU: 1 UID: 0 PID: 6637 Comm: syz.0.289 Not tainted 6.16.0-rc1-next-20250610-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_v1_get fs/bcachefs/sb-members.c:81 [inline] bch2_sb_members_v1_to_text+0x1b2/0x2b0 fs/bcachefs/sb-members.c:334 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/0x2570 fs/bcachefs/super.c:2382 bch2_fs_get_tree+0x437/0x14f0 fs/bcachefs/fs.c:2473 vfs_get_tree+0x8f/0x2b0 fs/super.c:1802 do_new_mount+0x24a/0xa40 fs/namespace.c:3885 do_mount fs/namespace.c:4222 [inline] __do_sys_mount fs/namespace.c:4433 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4410 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: 0033:0x7faf8df900ca 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:00007faf8ede0e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007faf8ede0ef0 RCX: 00007faf8df900ca RDX: 0000200000005b00 RSI: 0000200000005b40 RDI: 00007faf8ede0eb0 RBP: 0000200000005b00 R08: 00007faf8ede0ef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000005b40 R13: 00007faf8ede0eb0 R14: 0000000000005b30 R15: 0000200000005b80 Allocated by task 6637: 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_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/0x2570 fs/bcachefs/super.c:2382 bch2_fs_get_tree+0x437/0x14f0 fs/bcachefs/fs.c:2473 vfs_get_tree+0x8f/0x2b0 fs/super.c:1802 do_new_mount+0x24a/0xa40 fs/namespace.c:3885 do_mount fs/namespace.c:4222 [inline] __do_sys_mount fs/namespace.c:4433 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4410 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 ffff888079094000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 0 bytes to the right of allocated 8192-byte region [ffff888079094000, ffff888079096000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x79090 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 ffffea0000ca3200 dead000000000004 raw: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801a442280 ffffea0000ca3200 dead000000000004 head: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0001e42401 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 0x528c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NORETRY|__GFP_COMP), pid 5504, tgid 5504 (dhcpcd), ts 59140736920, free_ts 30185206703 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:2451 [inline] allocate_slab+0x8a/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] __do_kmalloc_node mm/slub.c:4327 [inline] __kvmalloc_node_noprof+0x429/0x5f0 mm/slub.c:5015 kvmalloc_array_node_noprof include/linux/slab.h:1065 [inline] __ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:471 [inline] ptr_ring_init_noprof include/linux/ptr_ring.h:489 [inline] skb_array_init_noprof include/linux/skb_array.h:182 [inline] pfifo_fast_init+0x363/0x6b0 net/sched/sch_generic.c:867 qdisc_create_dflt+0x138/0x4e0 net/sched/sch_generic.c:1017 mq_init+0x2dc/0x660 net/sched/sch_mq.c:90 qdisc_create_dflt+0x138/0x4e0 net/sched/sch_generic.c:1017 attach_default_qdiscs net/sched/sch_generic.c:1199 [inline] dev_activate+0x1ce/0x1150 net/sched/sch_generic.c:1253 __dev_open+0x69c/0x880 net/core/dev.c:1692 __dev_change_flags+0x1ea/0x6d0 net/core/dev.c:9458 netif_change_flags+0x88/0x1a0 net/core/dev.c:9521 dev_change_flags+0x130/0x260 net/core/dev_api.c:68 page last free pid 1 tgid 1 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 __free_pages mm/page_alloc.c:5071 [inline] free_contig_range+0x1bd/0x4a0 mm/page_alloc.c:6927 destroy_args+0x7e/0x5d0 mm/debug_vm_pgtable.c:1009 debug_vm_pgtable+0x412/0x450 mm/debug_vm_pgtable.c:1389 do_one_initcall+0x233/0x820 init/main.c:1274 do_initcall_level+0x137/0x1f0 init/main.c:1336 do_initcalls+0x69/0xd0 init/main.c:1352 kernel_init_freeable+0x3d9/0x570 init/main.c:1584 kernel_init+0x1d/0x1d0 init/main.c:1474 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff888079095f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888079095f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888079096000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888079096080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888079096100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================