NILFS (loop0): broken superblock, retrying with spare superblock (blocksize = 1024) ================================================================== BUG: KASAN: use-after-free in nilfs_mdt_destroy+0x4f/0x70 fs/nilfs2/mdt.c:497 Read of size 8 at addr ffff88801ee1b898 by task syz-executor596/3730 CPU: 0 PID: 3730 Comm: syz-executor596 Not tainted 6.0.0-rc6-syzkaller-00291-g3db61221f4e8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 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 lookup_open fs/namei.c:3413 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x12d0/0x2df0 fs/namei.c:3688 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 RIP: 0033:0x7fdf429e9bc9 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:00007ffe2688d468 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fdf429e9bc9 RDX: 000000000000275a RSI: 0000000020000180 RDI: 00000000ffffff9c RBP: 00007ffe2688d490 R08: 0000000000000002 R09: 00007ffe2688d4a0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003 R13: 00007ffe2688d4d0 R14: 00007ffe2688d4b0 R15: 000000000000003d Allocated by task 3620: 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_cpfile_read+0x121/0x1a0 fs/nilfs2/cpfile.c:997 nilfs_load_super_root fs/nilfs2/the_nilfs.c:125 [inline] load_nilfs+0x57e/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 ffff88801ee1b800 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 152 bytes inside of 256-byte region [ffff88801ee1b800, ffff88801ee1b900) The buggy address belongs to the physical page: page:ffffea00007b8680 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801ee1ac00 pfn:0x1ee1a head:ffffea00007b8680 order:1 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00004be900 dead000000000005 ffff888012041b40 raw: ffff88801ee1ac00 0000000080100009 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2, tgid 2 (kthreadd), ts 6707297789, free_ts 0 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:5515 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] set_kthread_struct+0xb1/0x1f0 kernel/kthread.c:117 copy_process+0x12cd/0x3f20 kernel/fork.c:2181 kernel_clone+0x21f/0x790 kernel/fork.c:2671 kernel_thread+0x150/0x1d0 kernel/fork.c:2724 create_kthread kernel/kthread.c:399 [inline] kthreadd+0x57c/0x750 kernel/kthread.c:745 ret_from_fork+0x1f/0x30 page_owner free stack trace missing Memory state around the buggy address: ffff88801ee1b780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801ee1b800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801ee1b880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801ee1b900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801ee1b980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================