[lkml]   [2017]   [Dec]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Subjectintel_pmu_init() extra_attr memory leak

I'm seeing this kmemleak report in v4.15-rc4:

# cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff8801f3d5d720 (size 64):
comm "swapper/0", pid 1, jiffies 4294667312 (age 2687.423s)
hex dump (first 32 bytes):
60 d1 41 ad ff ff ff ff 20 d1 41 ad ff ff ff ff `.A..... .A.....
80 d0 41 ad ff ff ff ff 40 d0 41 ad ff ff ff ff ..A.....@.A.....
[<00000000ab01886a>] intel_pmu_init+0x1844/0x1d38
[<00000000cf20c5f0>] init_hw_perf_events+0x8c/0x66f
[<00000000dd69189d>] do_one_initcall+0x7b/0x1d0
[<000000008ee1f02a>] kernel_init_freeable+0x163/0x2f9
[<00000000e32ca8d9>] kernel_init+0xf/0x120
[<0000000038a99264>] ret_from_fork+0x24/0x30
[<00000000ace6d26f>] 0xffffffffffffffff

$ ./scripts/faddr2line vmlinux intel_pmu_init+0x1844/0x1d38
intel_pmu_init at arch/x86/events/intel/core.c:4296

Which matches line:
extra_attr = merge_attr(extra_attr, skl_format_attr);

So looks like "extra_attr" is leaked here.

"git blame" points to this commit:

commit a5df70c354c26e20d5fd8eb64517f724e97ef0b2
Author: Andi Kleen <>
Date: Tue Aug 22 11:52:00 2017 -0700

perf/x86: Only show format attributes when supported


 \ /
  Last update: 2017-12-19 11:15    [W:0.216 / U:4.520 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site