8021q: adding VLAN 0 to HW filter on device batadv0
8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
==================================================================
BUG: KASAN: use-after-free in what_owner_is_waiting_for fs/locks.c:1000 [inline]
BUG: KASAN: use-after-free in posix_locks_deadlock fs/locks.c:1023 [inline]
BUG: KASAN: use-after-free in posix_lock_inode+0x1f9e/0x2750 fs/locks.c:1163
Read of size 8 at addr ffff888097fd3cd0 by task syz-executor3/9335

CPU: 0 PID: 9335 Comm: syz-executor3 Not tainted 4.20.0+ #3
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+0x1db/0x2d0 lib/dump_stack.c:113
 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187
 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135
 what_owner_is_waiting_for fs/locks.c:1000 [inline]
 posix_locks_deadlock fs/locks.c:1023 [inline]
 posix_lock_inode+0x1f9e/0x2750 fs/locks.c:1163
 posix_lock_file fs/locks.c:1346 [inline]
 vfs_lock_file fs/locks.c:2314 [inline]
 vfs_lock_file+0xc7/0xf0 fs/locks.c:2309
 do_lock_file_wait.part.0+0xe5/0x260 fs/locks.c:2328
 do_lock_file_wait fs/locks.c:2324 [inline]
 fcntl_setlk+0x2f1/0xfe0 fs/locks.c:2413
 do_compat_fcntl64+0x90a/0xae0 fs/fcntl.c:664
 __do_compat_sys_fcntl64 fs/fcntl.c:678 [inline]
 __se_compat_sys_fcntl64 fs/fcntl.c:675 [inline]
 __ia32_compat_sys_fcntl64+0x73/0xb0 fs/fcntl.c:675
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x333/0xf98 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
RIP: 0023:0xf7f76869
Code: 85 d2 74 02 89 0a 5b 5d c3 8b 04 24 c3 8b 14 24 c3 8b 3c 24 c3 90 90 90 90 90 90 90 90 90 90 90 90 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 002b:00000000f7f720cc EFLAGS: 00000296 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000007
RDX: 0000000020000140 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 9335:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 kasan_kmalloc mm/kasan/common.c:482 [inline]
 kasan_kmalloc+0xcf/0xe0 mm/kasan/common.c:455
 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:397
 kmem_cache_alloc+0x12d/0x710 mm/slab.c:3541
 kmem_cache_zalloc include/linux/slab.h:730 [inline]
 locks_alloc_lock+0x8e/0x2f0 fs/locks.c:344
 fcntl_setlk+0xa9/0xfe0 fs/locks.c:2362
 do_compat_fcntl64+0x90a/0xae0 fs/fcntl.c:664
 __do_compat_sys_fcntl64 fs/fcntl.c:678 [inline]
 __se_compat_sys_fcntl64 fs/fcntl.c:675 [inline]
 __ia32_compat_sys_fcntl64+0x73/0xb0 fs/fcntl.c:675
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x333/0xf98 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

Freed by task 9335:
 save_stack+0x45/0xd0 mm/kasan/common.c:73
 set_track mm/kasan/common.c:85 [inline]
 __kasan_slab_free+0x102/0x150 mm/kasan/common.c:444
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:452
 __cache_free mm/slab.c:3485 [inline]
 kmem_cache_free+0x86/0x260 mm/slab.c:3747
 locks_free_lock+0x27a/0x3f0 fs/locks.c:381
 fcntl_setlk+0x7b5/0xfe0 fs/locks.c:2439
 do_compat_fcntl64+0x90a/0xae0 fs/fcntl.c:664
 __do_compat_sys_fcntl64 fs/fcntl.c:678 [inline]
 __se_compat_sys_fcntl64 fs/fcntl.c:675 [inline]
 __ia32_compat_sys_fcntl64+0x73/0xb0 fs/fcntl.c:675
 do_syscall_32_irqs_on arch/x86/entry/common.c:326 [inline]
 do_fast_syscall_32+0x333/0xf98 arch/x86/entry/common.c:397
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139

The buggy address belongs to the object at ffff888097fd3cd0
 which belongs to the cache file_lock_cache of size 264
The buggy address is located 0 bytes inside of
 264-byte region [ffff888097fd3cd0, ffff888097fd3dd8)
The buggy address belongs to the page:
page:ffffea00025ff4c0 count:1 mapcount:0 mapping:ffff88821b6ae0c0 index:0x0
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea0002402108 ffffea0002416fc8 ffff88821b6ae0c0
raw: 0000000000000000 ffff888097fd3000 000000010000000c 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888097fd3b80: fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888097fd3c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888097fd3c80: fb fb fc fc fc fc fc fc fc fc fb fb fb fb fb fb
                                                 ^
 ffff888097fd3d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888097fd3d80: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
==================================================================