Re: [tip:locking/core] [futex] b78b0b6582: kselftests.damon.sysfs_memcg_path_leak.sh.fail

[Peter Zijlstra <peterz@infradead.org>]

On Fri, Aug 07, 2026 at 04:50:48PM +0800, kernel test robot wrote:
> 
> 
> Hello,
> 
> kernel test robot noticed "kselftests.damon.sysfs_memcg_path_leak.sh.fail" on:
> 
> commit: b78b0b65825275f58336a43611a700de174be8c3 ("futex: Use runtime constants for __futex_hash() hot path")
> https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git locking/core
> 
> 
> in testcase: kselftests
> version: kselftests-x86_64-f5098b6bae76-1_20260727
> with following parameters:
> 
> 	group: damon
> 
> 
> 
> config: x86_64-rhel-9.4-kselftests
> compiler: gcc-14
> test machine: 16 threads Intel(R) Core(TM) i7-13620H (Raptor Lake) with 32G memory
> 
> (please refer to attached dmesg/kmsg for entire log/backtrace)
> 
> 
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <oliver.sang@intel.com>
> | Closes: https://lore.kernel.org/oe-lkp/202608071053.6db6276e-lkp@intel.com
> 
> 
> # timeout set to 300
> # selftests: damon: sysfs_memcg_path_leak.sh
> # unreferenced object 0xffff8881029e0ab8 (size 8):
> #   comm "swapper/0", pid 1, jiffies 4294668108
> #   hex dump (first 8 bytes):
> #     00 00 d0 02 81 88 ff ff                          ........
> #   backtrace (crc 6c1bc6d6):
> #     __kmalloc_noprof+0x56b/0x830
> #     futex_init+0x108/0x3c0
> #     do_one_initcall+0xc3/0x4b0
> #     do_initcalls+0x215/0x240
> #     kernel_init_freeable+0x4a1/0x530
> #     kernel_init+0x18/0x180
> #     ret_from_fork+0x547/0x870
> #     ret_from_fork_asm+0x1a/0x30
> not ok 13 selftests: damon: sysfs_memcg_path_leak.sh # exit=1

I have no idea what DAMON does or what this selftest is on about. SJ?