I know dracut can update modules in initramfs, but I think it is too
slow. So I'm wondering what is the fastest way to update modules in
initramfs of CentOS 7?

Thanks!

When start service libvirtd by

service libvirtd start

the network will broke for a while and then reconnected.

Hi, I am a developer who worked on CentOS. Recently I am working on porting one of my
block drivers from CentOS 6.x to CentOS 7.x.

After I set multicast_router of bridge and it's port to 2, like following:
echo 2 > /sys/devices/virtual/net/eth81/bridge/multicast_router
echo 2 > /sys/devices/virtual/net/bond2/brport/multicast_router
Then soft lockup occured:
Message from syslogd@node-0 at Jan 9 15:47:12 ...
kernel:BUG: soft lockup - CPU#0 stuck for 61s!

Kernel crashed by panic("string"), but I can't see any register in vmcore:

crash> bt
PID: 53331 TASK: ffff880c523ed540 CPU: 2 COMMAND: "bw_sd-ar-7-0_2"
#0 [ffff880c4f12f978] machine_kexec at ffffffff81038ed9
#1 [ffff880c4f12f9d8] crash_kexec at ffffffff810c5a82
#2 [ffff880c4f12faa8] panic at ffffffff815113b2
#3 [ffff880c4f12fb28] sd_submit_bio at ffffffffa0747a02 [sd]
#4 [ffff880c4f12fb68] submit_clone_bio at ffffffffa0747d2b [sd]
#5 [ffff880c4f12fb78] split_and_submit_bio_for_cbd at ffffffffa0747ec9 [sd]
#6 [ffff880c4f12fbf8] sd_make_request at ffffffffa074c812 [sd]
#7 [ffff880c4

Hi,

I got a panic when running CentOS-6.5:

crash> bt
PID: 106074 TASK: ffff8839c1e32ae0 CPU: 4 COMMAND: "flushd4[cbd-sd-"
#0 [ffff8839c2a91900] machine_kexec at ffffffff81038fa9
#1 [ffff8839c2a91960] crash_kexec at ffffffff810c5992
#2 [ffff8839c2a91a30] oops_end at ffffffff81515c90
#3 [ffff8839c2a91a60] no_context at ffffffff81049f1b
#4 [ffff8839c2a91ab0] __bad_area_nosemaphore at ffffffff8104a1a5
#5 [ffff8839c2a91b00] bad_area_nosemaphore at ffffffff8104a273
#6 [ffff8839c2a91b10] __do_page_fault at ffffffff8104a9bf
#7 [ffff8839c2a91c30] do_page_fault at ffffffff8