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BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x3c15/0x55b0 kernel/locking/lockdep.c:3664
Read of size 8 at addr ffff8880a52b5f40 by task syz-executor.2/7751

CPU: 0 PID: 7751 Comm: syz-executor.2 Not tainted 5.1.0+ #1
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+0x113/0x167 lib/dump_stack.c:113
 print_address_description.cold.5+0x9/0x1ff mm/kasan/report.c:188
 __kasan_report.cold.6+0x1b/0x39 mm/kasan/report.c:317
 kasan_report+0x12/0x20 mm/kasan/common.c:614
 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
 __lock_acquire+0x3c15/0x55b0 kernel/locking/lockdep.c:3664
 lock_acquire+0x173/0x3d0 kernel/locking/lockdep.c:4302
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:338 [inline]
 rhashtable_walk_enter+0xf4/0x300 lib/rhashtable.c:669
 __tipc_dump_start+0x1bb/0x2c0 net/tipc/socket.c:3414
 tipc_dump_start+0x6e/0x90 net/tipc/socket.c:3396
 __netlink_dump_start+0x482/0x810 net/netlink/af_netlink.c:2351
 netlink_dump_start include/linux/netlink.h:226 [inline]
 tipc_sock_diag_handler_dump+0x186/0x260 net/tipc/diag.c:91
 __sock_diag_cmd net/core/sock_diag.c:232 [inline]
 sock_diag_rcv_msg+0x289/0x370 net/core/sock_diag.c:263
 netlink_rcv_skb+0x13c/0x380 net/netlink/af_netlink.c:2486
 sock_diag_rcv+0x25/0x40 net/core/sock_diag.c:274
 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
 netlink_unicast+0x43f/0x630 net/netlink/af_netlink.c:1337
 netlink_sendmsg+0x765/0xc50 net/netlink/af_netlink.c:1926
 sock_sendmsg_nosec net/socket.c:660 [inline]
 sock_sendmsg+0xb5/0xf0 net/socket.c:671
 ___sys_sendmsg+0x647/0x950 net/socket.c:2292
 __sys_sendmsg+0xd9/0x180 net/socket.c:2330
 __do_sys_sendmsg net/socket.c:2339 [inline]
 __se_sys_sendmsg net/socket.c:2337 [inline]
 __x64_sys_sendmsg+0x73/0xb0 net/socket.c:2337
 do_syscall_64+0xd0/0x530 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459279
Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fab0ddb9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000003
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fab0ddba6d4
R13: 00000000004c6cdf R14: 00000000004dbb08 R15: 00000000ffffffff

Allocated by task 19:
 save_stack+0x21/0x90 mm/kasan/common.c:71
 set_track mm/kasan/common.c:79 [inline]
 __kasan_kmalloc.constprop.8+0xc7/0xd0 mm/kasan/common.c:489
 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:497
 slab_post_alloc_hook mm/slab.h:437 [inline]
 slab_alloc mm/slab.c:3356 [inline]
 kmem_cache_alloc+0x11a/0x720 mm/slab.c:3518
 shmem_alloc_inode+0x15/0x30 mm/shmem.c:3628
 alloc_inode+0x5c/0x1a0 fs/inode.c:226
 new_inode_pseudo+0xc/0xd0 fs/inode.c:915
 new_inode+0x14/0x30 fs/inode.c:944
 shmem_get_inode+0x67/0x790 mm/shmem.c:2226
 shmem_mknod+0x49/0x1a0 mm/shmem.c:2862
 vfs_mknod+0x3ba/0x630 fs/namei.c:3717
 handle_create+0x1a7/0x4d0 drivers/base/devtmpfs.c:212
 handle drivers/base/devtmpfs.c:375 [inline]
 devtmpfsd+0x1ed/0x490 drivers/base/devtmpfs.c:401
 kthread+0x324/0x3e0 kernel/kthread.c:253
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8880a52b5a50
 which belongs to the cache shmem_inode_cache of size 1192
The buggy address is located 72 bytes to the right of
 1192-byte region [ffff8880a52b5a50, ffff8880a52b5ef8)
The buggy address belongs to the page:
page:ffffea000294ad40 count:1 mapcount:0 mapping:ffff88821baa96c0 index:0xffff8880a52b5ffd
flags: 0x1fffc0000000200(slab)
raw: 01fffc0000000200 ffffea000294ac48 ffffea000294ae48 ffff88821baa96c0
raw: ffff8880a52b5ffd ffff8880a52b5000 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a52b5e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880a52b5e80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
>ffff8880a52b5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff8880a52b5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a52b6000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
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