loop0: detected capacity change from 0 to 2048 ================================================================== BUG: KASAN: use-after-free in nilfs_mdt_destroy+0x4f/0x70 fs/nilfs2/mdt.c:497 Read of size 8 at addr ffff88807b3dfc98 by task syz-executor328/3724 CPU: 0 PID: 3724 Comm: syz-executor328 Not tainted 6.0.0-rc7-syzkaller-00250-ga962b54e162c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:317 print_report+0x108/0x1f0 mm/kasan/report.c:433 kasan_report+0xc3/0xf0 mm/kasan/report.c:495 nilfs_mdt_destroy+0x4f/0x70 fs/nilfs2/mdt.c:497 nilfs_free_inode+0x44/0x70 fs/nilfs2/super.c:168 i_callback fs/inode.c:249 [inline] alloc_inode fs/inode.c:274 [inline] new_inode_pseudo+0x19a/0x1d0 fs/inode.c:1019 new_inode+0x25/0x1d0 fs/inode.c:1047 nilfs_new_inode+0xca/0x8a0 fs/nilfs2/inode.c:334 nilfs_create+0xdc/0x2d0 fs/nilfs2/namei.c:85 vfs_create+0x302/0x490 fs/namei.c:3115 do_mknodat+0x412/0x6b0 fs/namei.c:3942 __do_sys_mknod fs/namei.c:3975 [inline] __se_sys_mknod fs/namei.c:3973 [inline] __x64_sys_mknod+0x8a/0xa0 fs/namei.c:3973 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f293acceb49 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd5c6bd748 EFLAGS: 00000246 ORIG_RAX: 0000000000000085 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f293acceb49 RDX: 0000000000000701 RSI: 0000000000000000 RDI: 00000000200000c0 RBP: 00007ffd5c6bd770 R08: 0000000000000001 R09: 00007ffd5c6bd780 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 00007ffd5c6bd7b0 R14: 00007ffd5c6bd790 R15: 0000000000000036 Allocated by task 3615: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc+0xcd/0x100 mm/kasan/common.c:516 kasan_kmalloc include/linux/kasan.h:234 [inline] __kmalloc+0x226/0x370 mm/slub.c:4429 kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] nilfs_mdt_init+0x42/0x1c0 fs/nilfs2/mdt.c:451 nilfs_dat_read+0x136/0x300 fs/nilfs2/dat.c:489 nilfs_load_super_root fs/nilfs2/the_nilfs.c:120 [inline] load_nilfs+0x4c8/0xfc0 fs/nilfs2/the_nilfs.c:269 nilfs_fill_super+0x27e/0x5d0 fs/nilfs2/super.c:1059 nilfs_mount+0x613/0x9b0 fs/nilfs2/super.c:1317 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x289/0xad0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88807b3dfc00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 152 bytes inside of 512-byte region [ffff88807b3dfc00, ffff88807b3dfe00) The buggy address belongs to the physical page: page:ffffea0001ecf700 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807b3dfc00 pfn:0x7b3dc head:ffffea0001ecf700 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001f5a508 ffffea00009d9a08 ffff888012041c80 raw: ffff88807b3dfc00 0000000000100004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2974, tgid 2974 (udevadm), ts 13450139530, free_ts 11071765552 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0x70/0xf0 mm/slub.c:1829 allocate_slab+0x5e/0x520 mm/slub.c:1974 new_slab mm/slub.c:2034 [inline] ___slab_alloc+0x3ee/0xc40 mm/slub.c:3036 __slab_alloc mm/slub.c:3123 [inline] slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3256 [inline] kmem_cache_alloc_trace+0x25f/0x310 mm/slub.c:3287 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] kernfs_fop_open+0x3c4/0xc70 fs/kernfs/file.c:680 do_dentry_open+0x777/0x1180 fs/open.c:880 do_open fs/namei.c:3557 [inline] path_openat+0x25fc/0x2df0 fs/namei.c:3691 do_filp_open+0x264/0x4f0 fs/namei.c:3718 do_sys_openat2+0x124/0x4e0 fs/open.c:1313 do_sys_open fs/open.c:1329 [inline] __do_sys_openat fs/open.c:1345 [inline] __se_sys_openat fs/open.c:1340 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1340 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x7d/0x5f0 mm/page_alloc.c:3476 free_contig_range+0xa3/0x160 mm/page_alloc.c:9453 destroy_args+0xfe/0x91d mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x43e/0x497 mm/debug_vm_pgtable.c:1354 do_one_initcall+0x1b9/0x3e0 init/main.c:1296 do_initcall_level+0x168/0x218 init/main.c:1369 do_initcalls+0x4b/0x8c init/main.c:1385 kernel_init_freeable+0x3f1/0x57b init/main.c:1623 kernel_init+0x19/0x2b0 init/main.c:1512 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Memory state around the buggy address: ffff88807b3dfb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807b3dfc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807b3dfc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807b3dfd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807b3dfd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================