loop1: 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 ffff88805e5b1fd8 by task syz.1.4923/22673 CPU: 0 UID: 0 PID: 22673 Comm: syz.1.4923 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: 0033:0x7fecc2f900ca 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:00007fecc3d7ce68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fecc3d7cef0 RCX: 00007fecc2f900ca RDX: 00002000000003c0 RSI: 0000200000000080 RDI: 00007fecc3d7ceb0 RBP: 00002000000003c0 R08: 00007fecc3d7cef0 R09: 0000000000808040 R10: 0000000000808040 R11: 0000000000000246 R12: 0000200000000080 R13: 00007fecc3d7ceb0 R14: 0000000000005934 R15: 0000200000000400 Allocated by task 22673: 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 ffff88805e5b0000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 8152 bytes inside of allocated 8192-byte region [ffff88805e5b0000, ffff88805e5b2000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5e5b0 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 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 00fff00000000040 ffff88801a442280 dead000000000122 0000000000000000 head: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 00fff00000000003 ffffea0001796c01 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 0x1d2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 22673, tgid 22672 (syz.1.4923), ts 1450794437367, free_ts 1449967699322 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] __kmalloc_node_track_caller_noprof+0x2f8/0x4e0 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 page last free pid 13843 tgid 13843 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 __folio_put+0x21b/0x2c0 mm/swap.c:112 put_netmem net/core/skbuff.c:7375 [inline] skb_page_unref include/linux/skbuff_ref.h:43 [inline] __skb_frag_unref include/linux/skbuff_ref.h:56 [inline] skb_release_data+0x49a/0x7c0 net/core/skbuff.c:1081 skb_release_all net/core/skbuff.c:1152 [inline] __kfree_skb+0x55/0x70 net/core/skbuff.c:1166 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3441 [inline] tcp_ack+0x2013/0x62b0 net/ipv4/tcp_input.c:4049 tcp_rcv_established+0xea0/0x1de0 net/ipv4/tcp_input.c:6216 tcp_v4_do_rcv+0xa23/0xce0 net/ipv4/tcp_ipv4.c:1925 tcp_v4_rcv+0x2676/0x2f00 net/ipv4/tcp_ipv4.c:2363 ip_protocol_deliver_rcu+0x221/0x440 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2fb/0x580 net/ipv4/ip_input.c:233 NF_HOOK+0x309/0x3a0 include/linux/netfilter.h:317 dst_input include/net/dst.h:469 [inline] ip_sublist_rcv_finish+0x21d/0x2a0 net/ipv4/ip_input.c:578 ip_list_rcv_finish net/ipv4/ip_input.c:627 [inline] ip_sublist_rcv+0x6e7/0x9b0 net/ipv4/ip_input.c:635 ip_list_rcv+0x3e2/0x430 net/ipv4/ip_input.c:669 __netif_receive_skb_list_ptype net/core/dev.c:6020 [inline] __netif_receive_skb_list_core+0x7d2/0x800 net/core/dev.c:6067 __netif_receive_skb_list net/core/dev.c:6119 [inline] netif_receive_skb_list_internal+0x975/0xcc0 net/core/dev.c:6210 Memory state around the buggy address: ffff88805e5b1f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805e5b1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805e5b2000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88805e5b2080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805e5b2100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================