On Mon, Aug 17, 2020 at 10:25 PM Paul Moore <paul@xxxxxxxxxxxxxx> wrote: > > On Thu, Aug 13, 2020 at 12:32 PM Stephen Smalley > <stephen.smalley.work@xxxxxxxxx> wrote: > > > > I noticed this in /sys/kernel/debug/kmemleak while testing other > > patches. This is on 5.8.0-rc1 but may be older. > > > > unreferenced object 0xffff888158b40380 (size 32): > > comm "netlabelctl", pid 2982, jiffies 4295212079 (age 3234.561s) > > hex dump (first 32 bytes): > > 80 03 b4 58 81 88 ff ff 80 03 b4 58 81 88 ff ff ...X.......X.... > > 90 03 b4 58 81 88 ff ff 90 03 b4 58 81 88 ff ff ...X.......X.... > > backtrace: > > [<000000009fe161a4>] netlbl_mgmt_add_common+0x2df/0x9b0 > > [<00000000816cc1d9>] netlbl_mgmt_adddef+0x133/0x190 > > [<00000000f060e456>] genl_rcv_msg+0x2dd/0x490 > > [<000000001c733400>] netlink_rcv_skb+0xd0/0x200 > > [<00000000c42f6f58>] genl_rcv+0x24/0x40 > > [<000000005421c040>] netlink_unicast+0x2b4/0x3e0 > > [<00000000ab107bba>] netlink_sendmsg+0x3a6/0x660 > > [<00000000643024bd>] sock_sendmsg+0x96/0xa0 > > [<00000000ba78e5a6>] ____sys_sendmsg+0x404/0x440 > > [<000000006f3de0f5>] ___sys_sendmsg+0xd8/0x140 > > [<000000009b8c70ea>] __sys_sendmsg+0xa3/0x110 > > [<00000000e65194c3>] do_syscall_64+0x52/0xb0 > > [<00000000367aebc6>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > Hmmm, that's interesting, a quick look at the code doesn't reveal > anything obvious and it looks like I don't currently have kmemleak > enabled in my kernel so I'll need to rebuild ... you wouldn't happen > to have line numbers for the backtrace above would you? Anything > special you did to reproduce this? I don't still have that kernel so I'll need to reproduce it again. It was reproducible however just by running the selinux-testsuite and then echo scan > /sys/kernel/debug/kmemleak and then cat /sys/kernel/debug/kmemleak. kmemleak-related config was: CONFIG_HAVE_DEBUG_KMEMLEAK=y CONFIG_DEBUG_KMEMLEAK=y CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE=4096 # CONFIG_DEBUG_KMEMLEAK_TEST is not set # CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF is not set CONFIG_DEBUG_KMEMLEAK_AUTO_SCAN=y
