Another NFSv4 KASAN splat, this time from rc3.
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BUG: KASAN: use-after-free in nfs4_exchange_id_done+0x3d7/0x8e0 [nfsv4]
Read of size 8 at addr ffff8804508af528 by task kworker/2:1/34
CPU: 2 PID: 34 Comm: kworker/2:1 Not tainted 4.13.0-rc3-think+ #1
Workqueue: rpciod rpc_async_schedule [sunrpc]
Call Trace:
dump_stack+0x68/0xa1
print_address_description+0xd9/0x270
kasan_report+0x257/0x370
? nfs4_exchange_id_done+0x3d7/0x8e0 [nfsv4]
check_memory_region+0x13a/0x1a0
__asan_loadN+0xf/0x20
nfs4_exchange_id_done+0x3d7/0x8e0 [nfsv4]
? nfs4_exchange_id_release+0xb0/0xb0 [nfsv4]
rpc_exit_task+0x69/0x110 [sunrpc]
? rpc_destroy_wait_queue+0x20/0x20 [sunrpc]
? rpc_destroy_wait_queue+0x20/0x20 [sunrpc]
__rpc_execute+0x1a0/0x840 [sunrpc]
? rpc_wake_up_queued_task+0x50/0x50 [sunrpc]
? __lock_is_held+0x9a/0x100
? debug_lockdep_rcu_enabled.part.16+0x1a/0x30
rpc_async_schedule+0x12/0x20 [sunrpc]
process_one_work+0x4d5/0xa70
? flush_delayed_work+0x70/0x70
? lock_acquire+0xfc/0x220
worker_thread+0x88/0x630
? pci_mmcfg_check_reserved+0xc0/0xc0
kthread+0x1a6/0x1f0
? process_one_work+0xa70/0xa70
? kthread_create_on_node+0xc0/0xc0
ret_from_fork+0x27/0x40
Allocated by task 1:
save_stack_trace+0x1b/0x20
save_stack+0x46/0xd0
kasan_kmalloc+0xad/0xe0
kasan_slab_alloc+0x12/0x20
kmem_cache_alloc+0xe0/0x2f0
getname_flags+0x43/0x220
getname+0x12/0x20
do_sys_open+0x14c/0x2b0
SyS_open+0x1e/0x20
do_syscall_64+0xea/0x260
return_from_SYSCALL_64+0x0/0x7a
Freed by task 1:
save_stack_trace+0x1b/0x20
save_stack+0x46/0xd0
kasan_slab_free+0x72/0xc0
kmem_cache_free+0xa8/0x300
putname+0x80/0x90
do_sys_open+0x22f/0x2b0
SyS_open+0x1e/0x20
do_syscall_64+0xea/0x260
return_from_SYSCALL_64+0x0/0x7a
The buggy address belongs to the object at ffff8804508aeac0\x0a which belongs to the cache names_cache of size 4096
The buggy address is located 2664 bytes inside of\x0a 4096-byte region [ffff8804508aeac0, ffff8804508afac0)
The buggy address belongs to the page:
page:ffffea0011422a00 count:1 mapcount:0 mapping: (null) index:0x0
[CONT START] compound_mapcount: 0
flags: 0x8000000000008100(slab|head)
raw: 8000000000008100 0000000000000000 0000000000000000 0000000100070007
raw: ffffea00113d6020 ffffea001136e220 ffff8804664f8040 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8804508af400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8804508af480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8804508af500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8804508af580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8804508af600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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