loop2: 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+0x199/0x2f0 fs/bcachefs/sb-members.c:341 Read of size 136 at addr ffff888174ae9fb8 by task syz.2.16/3370 CPU: 1 UID: 0 PID: 3370 Comm: syz.2.16 Not tainted 6.15.0-rc4-syzkaller #0 PREEMPT(undef) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0xf4/0x170 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xb4/0x290 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+0x29a/0x2b0 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+0x199/0x2f0 fs/bcachefs/sb-members.c:341 bch2_sb_field_validate+0x17c/0x210 fs/bcachefs/super-io.c:1376 bch2_sb_validate+0xe5e/0x12e0 fs/bcachefs/super-io.c:551 __bch2_read_super+0xb38/0xd10 fs/bcachefs/super-io.c:921 bch2_fs_open+0x1a5/0x890 fs/bcachefs/super.c:2230 bch2_fs_get_tree+0x3c0/0x1090 fs/bcachefs/fs.c:2466 vfs_get_tree+0x84/0x1a0 fs/super.c:1759 do_new_mount+0x1c7/0x850 fs/namespace.c:3884 do_mount fs/namespace.c:4224 [inline] __do_sys_mount fs/namespace.c:4435 [inline] __se_sys_mount+0x218/0x2b0 fs/namespace.c:4412 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x8f/0x170 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc7f8b9010a 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:00007fc7f7dfde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fc7f7dfdef0 RCX: 00007fc7f8b9010a RDX: 00002000000000c0 RSI: 0000200000000300 RDI: 00007fc7f7dfdeb0 RBP: 00002000000000c0 R08: 00007fc7f7dfdef0 R09: 0000000000000010 R10: 0000000000000010 R11: 0000000000000246 R12: 0000200000000300 R13: 00007fc7f7dfdeb0 R14: 00000000000059e1 R15: 0000200000000280 Allocated by task 3370: 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:4341 [inline] __kmalloc_node_track_caller_noprof+0x25f/0x4f0 mm/slub.c:4360 __do_krealloc mm/slub.c:4918 [inline] krealloc_noprof+0x122/0x300 mm/slub.c:4971 bch2_sb_realloc+0x22d/0x4c0 fs/bcachefs/super-io.c:221 read_one_super+0x36c/0x1450 fs/bcachefs/super-io.c:755 __bch2_read_super+0x65f/0xd10 fs/bcachefs/super-io.c:847 bch2_fs_open+0x1a5/0x890 fs/bcachefs/super.c:2230 bch2_fs_get_tree+0x3c0/0x1090 fs/bcachefs/fs.c:2466 vfs_get_tree+0x84/0x1a0 fs/super.c:1759 do_new_mount+0x1c7/0x850 fs/namespace.c:3884 do_mount fs/namespace.c:4224 [inline] __do_sys_mount fs/namespace.c:4435 [inline] __se_sys_mount+0x218/0x2b0 fs/namespace.c:4412 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x8f/0x170 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888174ae8000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 8120 bytes inside of allocated 8192-byte region [ffff888174ae8000, ffff888174aea000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x174ae8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x100000000000040(head|node=0|zone=2) page_type: f5(slab) raw: 0100000000000040 ffff888100042280 ffffea0005f82400 dead000000000003 raw: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 0100000000000040 ffff888100042280 ffffea0005f82400 dead000000000003 head: 0000000000000000 0000000080020002 00000000f5000000 0000000000000000 head: 0100000000000003 ffffea0005d2ba01 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 1560, tgid 1560 (syz-executor), ts 30183757225, free_ts 29872939789 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xec/0x120 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x3c07/0x3d60 mm/page_alloc.c:3688 __alloc_frozen_pages_noprof+0x26b/0x460 mm/page_alloc.c:4970 alloc_pages_mpol+0x150/0x320 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2468 [inline] allocate_slab+0x8a/0x350 mm/slub.c:2632 new_slab mm/slub.c:2686 [inline] ___slab_alloc+0x9dc/0x10e0 mm/slub.c:3872 __slab_alloc mm/slub.c:3962 [inline] __slab_alloc_node mm/slub.c:4037 [inline] slab_alloc_node mm/slub.c:4198 [inline] __kmalloc_cache_noprof+0x27c/0x410 mm/slub.c:4367 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] cgroup1_root_to_use kernel/cgroup/cgroup-v1.c:1235 [inline] cgroup1_get_tree+0x6cf/0xb60 kernel/cgroup/cgroup-v1.c:1262 vfs_get_tree+0x84/0x1a0 fs/super.c:1759 do_new_mount+0x1c7/0x850 fs/namespace.c:3884 do_mount fs/namespace.c:4224 [inline] __do_sys_mount fs/namespace.c:4435 [inline] __se_sys_mount+0x218/0x2b0 fs/namespace.c:4412 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x8f/0x170 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f page last free pid 1560 tgid 1560 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0xa04/0xbe0 mm/page_alloc.c:2725 discard_slab mm/slub.c:2730 [inline] __put_partials+0x157/0x1b0 mm/slub.c:3199 put_cpu_partial+0x154/0x1c0 mm/slub.c:3274 __slab_free+0x2a5/0x3a0 mm/slub.c:4526 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/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:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] __do_kmalloc_node mm/slub.c:4340 [inline] __kmalloc_noprof+0x20d/0x500 mm/slub.c:4353 kmalloc_noprof include/linux/slab.h:909 [inline] tomoyo_add_entry security/tomoyo/common.c:2132 [inline] tomoyo_supervisor+0xa79/0x1150 security/tomoyo/common.c:2204 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_check_open_permission+0x28e/0x520 security/tomoyo/file.c:777 security_file_open+0x45/0xd0 security/security.c:3114 do_dentry_open+0x2fd/0x1060 fs/open.c:933 vfs_open+0x36/0x2b0 fs/open.c:1086 do_open fs/namei.c:3880 [inline] path_openat+0x23e3/0x2bb0 fs/namei.c:4039 do_filp_open+0x1e4/0x3c0 fs/namei.c:4066 do_sys_openat2+0xfa/0x180 fs/open.c:1429 Memory state around the buggy address: ffff888174ae9f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888174ae9f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888174aea000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888174aea080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888174aea100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================