================================================================== BUG: KASAN: slab-out-of-bounds in bch2_sb_downgrade_to_text+0x58d/0x680 fs/bcachefs/sb-downgrade.c:185 Read of size 2 at addr ffff8880606f6000 by task syz-executor.3/6820 CPU: 1 PID: 6820 Comm: syz-executor.3 Not tainted 6.9.0-rc6-syzkaller-00234-g7367539ad4b0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 bch2_sb_downgrade_to_text+0x58d/0x680 fs/bcachefs/sb-downgrade.c:185 __bch2_sb_field_to_text+0x123/0x1e0 fs/bcachefs/super-io.c:1228 bch2_sb_field_validate+0x248/0x2d0 fs/bcachefs/super-io.c:1211 bch2_sb_validate.isra.0+0x6d8/0xce0 fs/bcachefs/super-io.c:468 __bch2_read_super+0x93c/0x12a0 fs/bcachefs/super-io.c:822 bch2_fs_open+0x3e5/0x1110 fs/bcachefs/super.c:2049 bch2_mount+0xdcc/0x1130 fs/bcachefs/fs.c:1903 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1779 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __x64_sys_mount+0x297/0x320 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff64da7f3aa Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff64e7d4ef8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ff64e7d4f80 RCX: 00007ff64da7f3aa RDX: 0000000020011a00 RSI: 0000000020000000 RDI: 00007ff64e7d4f40 RBP: 0000000020011a00 R08: 00007ff64e7d4f80 R09: 0000000003a04000 R10: 0000000003a04000 R11: 0000000000000202 R12: 0000000020000000 R13: 00007ff64e7d4f40 R14: 0000000000011a04 R15: 0000000020000600 Allocated by task 6820: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3966 [inline] __kmalloc_node_track_caller+0x220/0x470 mm/slub.c:3986 __do_krealloc mm/slab_common.c:1192 [inline] krealloc+0x5d/0x100 mm/slab_common.c:1225 bch2_sb_realloc+0x242/0x5d0 fs/bcachefs/super-io.c:189 read_one_super+0x318/0x12a0 fs/bcachefs/super-io.c:659 __bch2_read_super+0x4d6/0x12a0 fs/bcachefs/super-io.c:750 bch2_fs_open+0x3e5/0x1110 fs/bcachefs/super.c:2049 bch2_mount+0xdcc/0x1130 fs/bcachefs/fs.c:1903 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1779 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __x64_sys_mount+0x297/0x320 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff8880606f4000 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 [ffff8880606f4000, ffff8880606f6000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x606f0 head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 ksm flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888015042280 ffffea00007a7e00 0000000000000003 raw: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 head: 00fff00000000840 ffff888015042280 ffffea00007a7e00 0000000000000003 head: 0000000000000000 0000000000020002 00000001ffffffff 0000000000000000 head: 00fff00000000003 ffffea000181bc01 dead000000000122 00000000ffffffff head: 0000000800000000 0000000000000000 00000000ffffffff 0000000000000000 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 5476, tgid -1796581130 (syz-executor.3), ts 5477, free_ts 109818683426 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1534 prep_new_page mm/page_alloc.c:1541 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3317 __alloc_pages+0x22b/0x2460 mm/page_alloc.c:4575 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2175 [inline] allocate_slab mm/slub.c:2338 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2391 ___slab_alloc+0x66d/0x1790 mm/slub.c:3525 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3610 __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] __do_kmalloc_node mm/slub.c:3965 [inline] __kmalloc+0x3b4/0x440 mm/slub.c:3979 kmalloc include/linux/slab.h:632 [inline] f2fs_kmalloc fs/f2fs/f2fs.h:3391 [inline] f2fs_kzalloc fs/f2fs/f2fs.h:3410 [inline] read_all_xattrs+0x1b9/0x570 fs/f2fs/xattr.c:398 __f2fs_setxattr+0x2ab/0x1b00 fs/f2fs/xattr.c:653 f2fs_setxattr+0x1e1/0xde0 fs/f2fs/xattr.c:809 f2fs_initxattrs+0xbc/0x120 fs/f2fs/xattr.c:145 security_inode_init_security+0x21c/0x380 security/security.c:1744 f2fs_init_inode_metadata+0x1b5/0x12a0 fs/f2fs/dir.c:562 f2fs_add_regular_entry+0x7c4/0xb30 fs/f2fs/dir.c:740 f2fs_add_dentry+0x1e2/0x240 fs/f2fs/dir.c:788 f2fs_do_add_link+0x18f/0x290 fs/f2fs/dir.c:827 page last free pid 10 tgid 10 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1141 [inline] free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2347 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2487 __put_partials+0x14c/0x170 mm/slub.c:2906 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3798 [inline] slab_alloc_node mm/slub.c:3845 [inline] kmem_cache_alloc+0x136/0x320 mm/slub.c:3852 f2fs_kmem_cache_alloc_nofail fs/f2fs/f2fs.h:2817 [inline] f2fs_kmem_cache_alloc fs/f2fs/f2fs.h:2827 [inline] add_free_nid.isra.0+0x11a/0x8f0 fs/f2fs/node.c:2305 scan_free_nid_bits fs/f2fs/node.c:2456 [inline] __f2fs_build_free_nids+0x936/0xe70 fs/f2fs/node.c:2490 f2fs_build_free_nids+0x5a/0xb0 fs/f2fs/node.c:2555 f2fs_balance_fs_bg+0x17f/0xf60 fs/f2fs/segment.c:487 f2fs_write_node_pages+0x154/0x790 fs/f2fs/node.c:2126 do_writepages+0x1a3/0x7f0 mm/page-writeback.c:2612 __writeback_single_inode+0x163/0xf90 fs/fs-writeback.c:1650 writeback_sb_inodes+0x5a6/0x10d0 fs/fs-writeback.c:1941 wb_writeback+0x28a/0xb30 fs/fs-writeback.c:2117 Memory state around the buggy address: ffff8880606f5f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880606f5f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880606f6000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880606f6080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880606f6100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================