IPVS: ftp: loaded support on port[0] = 21
FAT-fs (loop4): Directory bread(block 6) failed
FAT-fs (loop4): Directory bread(block 7) failed
FAT-fs (loop4): Directory bread(block 8) failed
==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369
FAT-fs (loop4): Directory bread(block 9) failed
Read of size 8 at addr ffff8880545f11b8 by task syz-executor.3/10179

CPU: 1 PID: 10179 Comm: syz-executor.3 Not tainted 4.14.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x283 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x194 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430
 __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369
FAT-fs (loop4): Directory bread(block 10) failed
 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998
 __raw_write_lock_bh include/linux/rwlock_api_smp.h:203 [inline]
 _raw_write_lock_bh+0x2f/0x40 kernel/locking/spinlock.c:320
 sock_orphan include/net/sock.h:1711 [inline]
 nr_release+0x5b/0x340 net/netrom/af_netrom.c:524
 __sock_release+0xcd/0x2b0 net/socket.c:602
 sock_close+0x15/0x20 net/socket.c:1139
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x417a51
RSP: 002b:00007ffe8d2e4f60 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000417a51
RDX: 0000000000000000 RSI: ffffffff871c9538 RDI: 0000000000000007
RBP: 0000000000000001 R08: ffffffff8125d8cc R09: 0000000094743ea8
R10: 0000000094743eac R11: 0000000000000293 R12: 000000000119ca00
FAT-fs (loop4): Directory bread(block 11) failed
R13: 000000000119ca00 R14: 00000000000003e8 R15: 000000000119c184

FAT-fs (loop4): Directory bread(block 12) failed
Allocated by task 10204:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15a/0x400 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 sk_prot_alloc+0x1ba/0x290 net/core/sock.c:1467
 sk_alloc+0x36/0xcd0 net/core/sock.c:1521
FAT-fs (loop4): Directory bread(block 13) failed
 nr_create+0x99/0x5c0 net/netrom/af_netrom.c:436
FAT-fs (loop4): Directory bread(block 14) failed
 __sock_create+0x303/0x620 net/socket.c:1275
 sock_create net/socket.c:1315 [inline]
 SYSC_socket net/socket.c:1345 [inline]
 SyS_socket+0xd1/0x1b0 net/socket.c:1325
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
FAT-fs (loop4): Directory bread(block 15) failed

Freed by task 10179:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 sk_prot_free net/core/sock.c:1504 [inline]
 __sk_destruct+0x5e3/0x760 net/core/sock.c:1582
 sk_destruct net/core/sock.c:1597 [inline]
 __sk_free+0xd9/0x2d0 net/core/sock.c:1605
 sk_free+0x2b/0x40 net/core/sock.c:1616
 sock_put include/net/sock.h:1662 [inline]
 nr_release+0x2b7/0x340 net/netrom/af_netrom.c:557
 __sock_release+0xcd/0x2b0 net/socket.c:602
 sock_close+0x15/0x20 net/socket.c:1139
 __fput+0x25f/0x7a0 fs/file_table.c:210
 task_work_run+0x11f/0x190 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x46/0xbb

The buggy address belongs to the object at ffff8880545f0e40
 which belongs to the cache kmalloc-2048 of size 2048
The buggy address is located 888 bytes inside of
 2048-byte region [ffff8880545f0e40, ffff8880545f1640)
The buggy address belongs to the page:
page:ffffea0001517c00 count:1 mapcount:0 mapping:ffff8880545f05c0 index:0x0 compound_mapcount: 0
flags: 0xfff00000008100(slab|head)
raw: 00fff00000008100 ffff8880545f05c0 0000000000000000 0000000100000003
raw: ffffea0001512fa0 ffffea0002a95ba0 ffff88813fe80c40 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880545f1080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880545f1100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880545f1180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff8880545f1200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880545f1280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================