EXT4-fs error (device loop4): ext4_readdir:260: inode #2: block 48: comm syz-executor: path /0/file0: bad entry in directory: rec_len is smaller than minimal - offset=980, inode=0, rec_len=0, size=1024 fake=0 ================================================================== BUG: KASAN: slab-out-of-bounds in ext4_read_inline_data fs/ext4/inline.c:209 [inline] BUG: KASAN: slab-out-of-bounds in ext4_read_inline_dir+0x48b/0xdf0 fs/ext4/inline.c:1483 Read of size 732 at addr ffff88806898126d by task syz-executor/10438 CPU: 1 UID: 0 PID: 10438 Comm: syz-executor Not tainted 6.11.0-rc5-syzkaller-00176-g20371ba12063 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105 ext4_read_inline_data fs/ext4/inline.c:209 [inline] ext4_read_inline_dir+0x48b/0xdf0 fs/ext4/inline.c:1483 ext4_readdir+0x3bb/0x3500 fs/ext4/dir.c:158 iterate_dir+0x57a/0x810 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:407 [inline] __se_sys_getdents64+0x20d/0x4f0 fs/readdir.c:392 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f629f9ac093 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 32 43 f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8 RSP: 002b:00007fffd2f46b78 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 0000555559d5a640 RCX: 00007f629f9ac093 RDX: 0000000000008000 RSI: 0000555559d5a640 RDI: 0000000000000006 RBP: 0000555559d5a614 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000016 R14: 0000555559d5a610 R15: 00007fffd2f49f10 Allocated by task 10369: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4080 alloc_and_link_pwqs kernel/workqueue.c:5458 [inline] alloc_workqueue+0xe06/0x1fe0 kernel/workqueue.c:5701 wg_newlink+0x1a8/0x640 drivers/net/wireguard/device.c:333 rtnl_newlink_create net/core/rtnetlink.c:3510 [inline] __rtnl_newlink net/core/rtnetlink.c:3730 [inline] rtnl_newlink+0x1591/0x20a0 net/core/rtnetlink.c:3743 rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2212 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888068981000 which belongs to the cache pool_workqueue of size 512 The buggy address is located 109 bytes to the right of allocated 512-byte region [ffff888068981000, ffff888068981200) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x68980 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff888015491140 ffffea0000b95d00 dead000000000002 raw: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff888015491140 ffffea0000b95d00 dead000000000002 head: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000 head: 00fff00000000002 ffffea0001a26001 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 8867, tgid 8866 (syz.2.333), ts 358681425017, free_ts 358469847564 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2321 allocate_slab+0x5a/0x2f0 mm/slub.c:2484 new_slab mm/slub.c:2537 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 __slab_alloc+0x58/0xa0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] kmem_cache_alloc_node_noprof+0x1fe/0x320 mm/slub.c:4080 alloc_unbound_pwq+0xaeb/0x1070 kernel/workqueue.c:5128 apply_wqattrs_prepare+0x481/0xef0 kernel/workqueue.c:5249 apply_workqueue_attrs_locked+0x63/0x200 kernel/workqueue.c:5325 alloc_and_link_pwqs kernel/workqueue.c:5475 [inline] alloc_workqueue+0x1537/0x1fe0 kernel/workqueue.c:5701 btrfs_init_workqueues+0x445/0x740 fs/btrfs/disk-io.c:2010 open_ctree+0x122c/0x2a10 fs/btrfs/disk-io.c:3364 btrfs_fill_super fs/btrfs/super.c:965 [inline] btrfs_get_tree_super fs/btrfs/super.c:1888 [inline] btrfs_get_tree+0xe7a/0x1920 fs/btrfs/super.c:2114 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 page last free pid 8867 tgid 8866 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0xd19/0xea0 mm/page_alloc.c:2612 __slab_free+0x31b/0x3d0 mm/slub.c:4384 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4044 alloc_buffer_head+0x2a/0x290 fs/buffer.c:3025 folio_alloc_buffers+0x241/0x5b0 fs/buffer.c:929 create_empty_buffers+0x3a/0x740 fs/buffer.c:1671 block_read_full_folio+0x25c/0xcd0 fs/buffer.c:2387 filemap_read_folio+0x1a0/0x790 mm/filemap.c:2355 do_read_cache_folio+0x134/0x820 mm/filemap.c:3789 do_read_cache_page+0x30/0x200 mm/filemap.c:3855 btrfs_read_dev_one_super+0x252/0x3c0 fs/btrfs/disk-io.c:3687 btrfs_read_dev_super fs/btrfs/disk-io.c:3718 [inline] open_ctree+0xb20/0x2a10 fs/btrfs/disk-io.c:3246 btrfs_fill_super fs/btrfs/super.c:965 [inline] btrfs_get_tree_super fs/btrfs/super.c:1888 [inline] btrfs_get_tree+0xe7a/0x1920 fs/btrfs/super.c:2114 Memory state around the buggy address: ffff888068981100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888068981180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888068981200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888068981280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888068981300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================