NILFS error (device loop2): nilfs_check_page: bad entry in directory #2: rec_len is smaller than minimal - offset=0, inode=131072, rec_len=0, name_len=16 Remounting filesystem read-only ================================================================== BUG: KASAN: use-after-free in nilfs_mdt_destroy+0x4f/0x70 fs/nilfs2/mdt.c:497 Read of size 8 at addr ffff88802901e498 by task syz-executor.2/26267 CPU: 0 PID: 26267 Comm: syz-executor.2 Not tainted 6.0.0-syzkaller-02734-g0326074ff465 #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 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_creat fs/open.c:1405 [inline] __se_sys_creat fs/open.c:1399 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1399 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: 0033:0x7fe7dec8a5a9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe7dfe76168 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007fe7dedac050 RCX: 00007fe7dec8a5a9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000200 RBP: 00007fe7dfe761d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffdda5baccf R14: 00007fe7dfe76300 R15: 0000000000022000 Allocated by task 2974: 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] kmem_cache_alloc_trace+0x97/0x310 mm/slub.c:3289 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 The buggy address belongs to the object at ffff88802901e400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 152 bytes inside of 512-byte region [ffff88802901e400, ffff88802901e600) The buggy address belongs to the physical page: page:ffffea0000a40700 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802901d000 pfn:0x2901c head:ffffea0000a40700 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000aaf408 ffffea0000a76208 ffff888012041c80 raw: ffff88802901d000 0000000000100009 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 3636, tgid 3636 (syz-executor.1), ts 163224494040, 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: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] device_private_init drivers/base/core.c:3361 [inline] device_add+0xb6/0xf90 drivers/base/core.c:3411 netdev_register_kobject+0x178/0x310 net/core/net-sysfs.c:2015 register_netdevice+0x1043/0x1790 net/core/dev.c:10053 veth_newlink+0x888/0xd10 drivers/net/veth.c:1795 rtnl_newlink_create net/core/rtnetlink.c:3364 [inline] __rtnl_newlink net/core/rtnetlink.c:3581 [inline] rtnl_newlink+0x147d/0x1fa0 net/core/rtnetlink.c:3594 rtnetlink_rcv_msg+0x772/0xe60 net/core/rtnetlink.c:6091 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2540 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7e7/0x9c0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x9b3/0xcd0 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] __sys_sendto+0x46e/0x5f0 net/socket.c:2117 page_owner free stack trace missing Memory state around the buggy address: ffff88802901e380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802901e400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802901e480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802901e500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802901e580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================