Hi, I suppose I observe a substantial mem leak in the kernel while using perf_event_open()
Reproducible under: Kernel: $ uname -a Linux test1 4.0.0-0.rc2.git0.1.fc22.x86_64 #1 SMP Tue Mar 3 21:24:17 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux Not reproducible under: Linux test2 3.16.0-30-generic #40~14.04.1-Ubuntu SMP Thu Jan 15 17:43:14 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux Repro - with: https://code.google.com/p/honggfuzz/source/checkout Note: It might be related to the CPU, as Intel vs AMD code differs in a few places here. I tested it under Intel only though. $ ~/src/honggfuzz/honggfuzz -Di -f /bin/ls -s -- /bin/ls ... $ while [ 1 ]; do cat /proc/meminfo | grep -E "Stack|Slab"; sleep 1; done Slab: 437584 kB KernelStack: 1037472 kB Slab: 439160 kB KernelStack: 1046528 kB Slab: 443036 kB KernelStack: 1055488 kB Slab: 446360 kB KernelStack: 1065888 kB Slab: 448540 kB KernelStack: 1073008 kB Slab: 452428 kB KernelStack: 1082912 kB Slab: 455548 kB KernelStack: 1094640 kB Slab: 458620 kB KernelStack: 1102448 kB Slab: 462488 kB KernelStack: 1114752 kB Slab: 466632 kB KernelStack: 1123936 kB Slab: 468024 kB KernelStack: 1129040 kB Slab: 470780 kB KernelStack: 1135712 kB Slab: 473148 kB KernelStack: 1145856 kB Slab: 477684 kB KernelStack: 1156528 kB Slab: 480804 kB KernelStack: 1165904 kB Slab: 482524 kB KernelStack: 1174032 kB Slab: 485496 kB KernelStack: 1183120 kB # slabtop OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME 90528 90528 100% 2.47K 7544 12 241408K task_struct [a few sec sleep] OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME 97356 97356 100% 2.47K 8113 12 259616K task_struct [a few sec sleep] OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME 103668 103668 100% 2.47K 8639 12 276448K task_struct It seems to be not released after all involved processes have terminated. Will try to debug it more, but others might see some obvious problem here. -- Robert Święcki -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
