IPVS: ftp: loaded support on port[0] = 21
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x3829/0x5020 kernel/locking/lockdep.c:3291
Read of size 8 at addr ffff8801d530c8b8 by task syz-executor3/6869

CPU: 0 PID: 6869 Comm: syz-executor3 Not tainted 4.18.0-next-20180817+ #42
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433
 __lock_acquire+0x3829/0x5020 kernel/locking/lockdep.c:3291
 lock_acquire+0x1e4/0x4f0 kernel/locking/lockdep.c:3901
 __mutex_lock_common kernel/locking/mutex.c:925 [inline]
 __mutex_lock+0x171/0x1700 kernel/locking/mutex.c:1073
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088
 blkdev_get+0x5f2/0xb50 fs/block_dev.c:1623
 blkdev_get_by_dev+0x3f/0x80 fs/block_dev.c:1739
 journal_init_dev fs/reiserfs/journal.c:2628 [inline]
 journal_init+0xcad/0x6a20 fs/reiserfs/journal.c:2775
 reiserfs_fill_super+0xd74/0x3930 fs/reiserfs/super.c:2037
 mount_bdev+0x314/0x3e0 fs/super.c:1347
 get_super_block+0x3c/0x50 fs/reiserfs/super.c:2608
 legacy_get_tree+0x131/0x460 fs/fs_context.c:732
 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1746
 do_new_mount fs/namespace.c:2627 [inline]
 do_mount+0x6f9/0x1e30 fs/namespace.c:2951
 ksys_mount+0x12d/0x140 fs/namespace.c:3167
 __do_sys_mount fs/namespace.c:3181 [inline]
 __se_sys_mount fs/namespace.c:3178 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3178
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459aba
Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 bd 8a fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 9a 8a fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007fe822180a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fe822180b30 RCX: 0000000000459aba
RDX: 00007fe822180ad0 RSI: 0000000020000040 RDI: 00007fe822180af0
RBP: 0000000020000040 R08: 00007fe822180b30 R09: 00007fe822180ad0
R10: 0000000000008000 R11: 0000000000000206 R12: 0000000000000006
R13: 0000000000008000 R14: 00000000004c9d14 R15: 0000000000000001

Allocated by task 6869:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490
 kmem_cache_alloc+0x12e/0x710 mm/slab.c:3554
 bdev_alloc_inode+0x1b/0x40 fs/block_dev.c:730
 alloc_inode+0x63/0x190 fs/inode.c:210
 iget5_locked+0x12e/0x1d0 fs/inode.c:1123
 bdget+0xb7/0x5e0 fs/block_dev.c:871
 blkdev_get_by_dev+0x24/0x80 fs/block_dev.c:1735
 journal_init_dev fs/reiserfs/journal.c:2628 [inline]
 journal_init+0xcad/0x6a20 fs/reiserfs/journal.c:2775
 reiserfs_fill_super+0xd74/0x3930 fs/reiserfs/super.c:2037
 mount_bdev+0x314/0x3e0 fs/super.c:1347
 get_super_block+0x3c/0x50 fs/reiserfs/super.c:2608
 legacy_get_tree+0x131/0x460 fs/fs_context.c:732
 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1746
 do_new_mount fs/namespace.c:2627 [inline]
 do_mount+0x6f9/0x1e30 fs/namespace.c:2951
 ksys_mount+0x12d/0x140 fs/namespace.c:3167
 __do_sys_mount fs/namespace.c:3181 [inline]
 __se_sys_mount fs/namespace.c:3178 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3178
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 6869:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kmem_cache_free+0x86/0x280 mm/slab.c:3756
 bdev_i_callback+0x20/0x30 fs/block_dev.c:741
 __rcu_reclaim kernel/rcu/rcu.h:236 [inline]
 rcu_do_batch kernel/rcu/tree.c:2576 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2880 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2847 [inline]
 rcu_process_callbacks+0xf78/0x27c0 kernel/rcu/tree.c:2864
 __do_softirq+0x2eb/0xa74 kernel/softirq.c:292

The buggy address belongs to the object at ffff8801d530c840
 which belongs to the cache bdev_cache of size 1336
The buggy address is located 120 bytes inside of
 1336-byte region [ffff8801d530c840, ffff8801d530cd78)
The buggy address belongs to the page:
page:ffffea000754c300 count:1 mapcount:0 mapping:ffff8801dad754c0 index:0xffff8801d530cffe
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffffea000754ec08 ffff8801dad74548 ffff8801dad754c0
raw: ffff8801d530cffe ffff8801d530c280 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801d530c780: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
 ffff8801d530c800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
>ffff8801d530c880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff8801d530c900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801d530c980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================