======================================
| make[1]: Leaving directory '/home/virtme/testing-3/tools/testing/selftests/net'
| make: Leaving directory '/home/virtme/testing-3/tools/testing/selftests'
| xx__-> echo $?
| 0
| xx__-> echo scan > /sys/kernel/debug/kmemleak && cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff888009c5d878 (size 8):
comm "tap", pid 21490, jiffies 4299151778
hex dump (first 8 bytes):
00 00 00 00 00 00 00 00                          ........
backtrace (crc 0):
__kmalloc_cache_noprof (./include/linux/kmemleak.h:43 mm/slub.c:4119 mm/slub.c:4164 mm/slub.c:4320) 
tun_vnet_ioctl_sethash (./include/linux/slab.h:901 drivers/net/tun_vnet.h:174) 
tap_ioctl (drivers/net/tap.c:1055 (discriminator 1)) 
__x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:906 fs/ioctl.c:892 fs/ioctl.c:892) 
do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
| entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) 
| xx__-> echo scan > /sys/kernel/debug/kmemleak && cat /sys/kernel/debug/kmemleak
|
| DETECTED CRASH, lowering timeout
unreferenced object 0xffff888009c5d878 (size 8):
comm "tap", pid 21490, jiffies 4299151778
hex dump (first 8 bytes):
00 00 00 00 00 00 00 00                          ........
backtrace (crc 0):
__kmalloc_cache_noprof (./include/linux/kmemleak.h:43 mm/slub.c:4119 mm/slub.c:4164 mm/slub.c:4320) 
tun_vnet_ioctl_sethash (./include/linux/slab.h:901 drivers/net/tun_vnet.h:174) 
tap_ioctl (drivers/net/tap.c:1055 (discriminator 1)) 
__x64_sys_ioctl (fs/ioctl.c:51 fs/ioctl.c:906 fs/ioctl.c:892 fs/ioctl.c:892) 
do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 


Finger prints:
__kmalloc_cache_noprof:tun_vnet_ioctl_sethash:tap_ioctl:__x64_sys_ioctl:do_syscall_64
do_syscall_64:__kmalloc_cache_noprof:tun_vnet_ioctl_sethash:tap_ioctl:__x64_sys_ioctl