Package: udev Version: 175-7 Severity: normal Hi,
when starting and generating the initial events, udevd tries to load modules kvm and kvm-intel for every running cpu in the system in parallel. When loading a module, the kernel first sets up module memory including per cpu variables, checks symbols and so on and later checks if a module with the same name has already been loaded. Only this final name checking is serialized. As percpu memory for modules is limited to 8192 bytes on x86_64 and kvm needs comparatively many 304 bytes, setup for 32 instances of kvm does not fit within the reserved maximum. This results in several kernel messages like this and module loading fails: PERCPU: allocation failed, size=304 align=32, alloc from reserved chunk failed Pid: 10288, comm: modprobe Not tainted 3.6.0-rc4-64+ #5 Call Trace: [<ffffffff810a7a38>] ? pcpu_alloc+0xa48/0xaa0 [<ffffffff81071845>] ? find_sec+0x55/0x80 [<ffffffff810739d3>] ? sys_init_module+0x383/0x1b40 [<ffffffff8146139b>] ? sysenter_dispatch+0x7/0x1e kvm: Could not allocate 304 bytes percpu data Starting udevd with --children-max=1, the problem disappears of course. If other modules fail to load at the same time for the same reason, this problem becomes more important, because there might not be several devices of the same kind and thus there is no "retry" like with kvm and many cpus. Maybe udevd should not run commands for individual instances of devices with the same device id in parallel because i. e. loading a module for the first instance might actually take care of all the other ones at the same time. Regards Stephan -- System Information: Debian Release: wheezy/sid APT prefers testing APT policy: (550, 'testing'), (500, 'stable'), (210, 'unstable'), (1, 'experimental') Architecture: i386 (x86_64) Kernel: Linux 3.6.0-rc4-64+ (SMP w/32 CPU cores; PREEMPT) Locale: LANG=C, LC_CTYPE=de_DE (charmap=ISO-8859-1) Shell: /bin/sh linked to /bin/dash Versions of packages udev depends on: ii debconf [debconf-2.0] 1.5.46 ii libc6 2.13-35 ii libselinux1 2.1.9-5 ii libudev0 175-7 ii lsb-base 4.1+Debian7 ii procps 1:3.3.3-2 ii util-linux 2.20.1-5.1 Versions of packages udev recommends: ii pciutils 1:3.1.9-5 ii usbutils 1:005-3 udev suggests no packages. -- debconf information excluded -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
