0x01:
[ 6427.046157] INFO: Object 0xffff8807193b4500 @offset=1280 [ 6427.048395] INFO: Object 0xffff8807193b4600 @offset=1536 [ 6427.050652] INFO: Object 0xffff8807193b4900 @offset=2304 [ 6427.052912] INFO: Object 0xffff8807193b4b00 @offset=2816 [ 6427.055199] INFO: Object 0xffff8807193b4f00 @offset=3840 [ 6427.057439] INFO: Object 0xffff8807193b5500 @offset=5376 [ 6427.059795] kmem_cache_destroy kmalloc-256(81:75d3e24890255b229ca436ec14b01121bbc6c2b3ea43117c8cf922e318bd5b53): Slab cache still has objects [ 6427.064782] CPU: 5 PID: 15225 Comm: rmmod Tainted: P B OE ------------ T 3.10.0-693.el7.1.x86_64 #1 [ 6427.064786] Hardware name: Red Hat KVM, BIOS seabios-1.7.5-11.el7 04/01/2014 [ 6427.064789] ffff880786a6da00 00000000e7a220d2 ffff8800ae307e40 ffffffff816a3dc1 [ 6427.064794] ffff8800ae307e60 ffffffff811a6910 0000000000000051 ffff880786a6da00 [ 6427.064798] ffff8800ae307e88 ffffffff811f6009 ffff88017fc03700 ffffffff81b1caa0 [ 6427.064803] Call Trace: [ 6427.064813] [<ffffffff816a3dc1>] dump_stack+0x19/0x1b [ 6427.064820] [<ffffffff811a6910>] kmem_cache_destroy+0xe0/0xf0 [ 6427.064825] [<ffffffff811f6009>] kmem_cache_destroy_memcg_children+0x89/0xb0 [ 6427.064829] [<ffffffff811a6849>] kmem_cache_destroy+0x19/0xf0 [ 6427.064847] [<ffffffffc03399da>] nf_conntrack_expect_fini+0x1a/0x20 [nf_conntrack] [ 6427.064856] [<ffffffffc0337445>] nf_conntrack_cleanup_end+0xc5/0xd0 [nf_conntrack] [ 6427.064866] [<ffffffffc0341d0c>] nf_conntrack_standalone_fini+0x26/0x31a [nf_conntrack] [ 6427.064872] [<ffffffff810fe55b>] SyS_delete_module+0x19b/0x300 [ 6427.064878] [<ffffffff816afa6a>] ? do_async_page_fault+0x1a/0xd0 [ 6427.064883] [<ffffffff816b5009>] system_call_fastpath+0x16/0x1b [ 6428.586550] Ebtables v2.0 unregistered [ 6429.539199] ip6_tables: (C) 2000-2006 Netfilter Core Team [ 6429.708093] Ebtables v2.0 registered [ 6429.911806] nf_conntrack version 0.5.0 (65536 buckets, 262144 max)
0x02
3.10.0-693.el7.1.x86_64
0x03
Only the workaround, i.e. setting CleanupOnExit=no in /etc/firewalld/firewalld.conf resolves the issue.
