Hi, I'have installed a new DELL VRTX M620 Blade with self compiled kernel 3.18.7 and the recent linux-vserver patch. After system startup I tried to activate the kernel netconsole with remote logging enabled. I executed the following command and the shell i issued it becomes unresponsive and it hangs. # modprobe netconsole netconsole="@/eth0,514@10.1.10.197/00:10:db:fc:60:0c" The system load increases slowly and the CPU #3 uses 100% of soft irq. Only a soft reset witohut loading the netconsole module solves the issue. I found the following error in the kernel log: ... Apr 7 12:33:23 server2 kernel: [ 180.582285] ------------[ cut here ]------------ Apr 7 12:33:23 server2 kernel: [ 180.582292] WARNING: CPU: 3 PID: 2978 at kernel/softirq.c:147 __local_bh_enable_ip+0x72/0xa0() Apr 7 12:33:23 server2 kernel: [ 180.582303] CPU: 3 PID: 2978 Comm: modprobe Not tainted 3.18.7-vs2.3.7.4-em64t-efigpt #2 Apr 7 12:33:23 server2 kernel: [ 180.582304] Hardware name: Dell Inc. PowerEdge M620/0NJVT7, BIOS 2.4.3 07/02/2014 Apr 7 12:33:23 server2 kernel: [ 180.582306] 0000000000000009 ffff881fc4a239e8 ffffffff817438ac 000000001b361b36 Apr 7 12:33:23 server2 kernel: [ 180.582307] 0000000000000000 ffff881fc4a23a28 ffffffff81051f8c ffffffff81f49040 Apr 7 12:33:23 server2 kernel: [ 180.582308] 0000000000000200 ffff881fcf0f0dd4 ffff881fcf0f0d58 0000000000000000 Apr 7 12:33:23 server2 kernel: [ 180.582308] Call Trace: Apr 7 12:33:23 server2 kernel: [ 180.582313] [<ffffffff817438ac>] dump_stack+0x46/0x58 Apr 7 12:33:23 server2 kernel: [ 180.582315] [<ffffffff81051f8c>] warn_slowpath_common+0x8c/0xc0 Apr 7 12:33:23 server2 kernel: [ 180.582316] [<ffffffff81051fda>] warn_slowpath_null+0x1a/0x20 Apr 7 12:33:23 server2 kernel: [ 180.582318] [<ffffffff81055fa2>] __local_bh_enable_ip+0x72/0xa0 Apr 7 12:33:23 server2 kernel: [ 180.582322] [<ffffffff8174992b>] _raw_spin_unlock_bh+0x1b/0x20 Apr 7 12:33:23 server2 kernel: [ 180.582335] [<ffffffffa00b7f33>] bnx2x_poll+0x83/0x3c0 [bnx2x] Apr 7 12:33:23 server2 kernel: [ 180.582338] [<ffffffff81667360>] netpoll_poll_dev+0x110/0x1b0 Apr 7 12:33:23 server2 kernel: [ 180.582340] [<ffffffff81667567>] netpoll_send_skb_on_dev+0x167/0x240 Apr 7 12:33:23 server2 kernel: [ 180.582341] [<ffffffff81667912>] netpoll_send_udp+0x2d2/0x400 Apr 7 12:33:23 server2 kernel: [ 180.582343] [<ffffffffa017985f>] write_msg+0xcf/0x110 [netconsole] Apr 7 12:33:23 server2 kernel: [ 180.582347] [<ffffffff8109e22b>] call_console_drivers.constprop.27+0x9b/0x100 Apr 7 12:33:23 server2 kernel: [ 180.582348] [<ffffffff8109f28a>] console_unlock+0x3ba/0x440 Apr 7 12:33:23 server2 kernel: [ 180.582350] [<ffffffff810a062a>] register_console+0x29a/0x360 Apr 7 12:33:23 server2 kernel: [ 180.582351] [<ffffffffa0190000>] ? 0xffffffffa0190000 Apr 7 12:33:23 server2 kernel: [ 180.582353] [<ffffffffa01901c5>] init_netconsole+0x1c5/0x1000 [netconsole] Apr 7 12:33:23 server2 kernel: [ 180.582356] [<ffffffff810002dc>] do_one_initcall+0x8c/0x1c0 Apr 7 12:33:23 server2 kernel: [ 180.582359] [<ffffffff81180ca2>] ? __vunmap+0xc2/0x110 Apr 7 12:33:23 server2 kernel: [ 180.582361] [<ffffffff810d7e7d>] load_module+0x1dbd/0x25b0 Apr 7 12:33:23 server2 kernel: [ 180.582363] [<ffffffff810d4660>] ? show_initstate+0x60/0x60 Apr 7 12:33:23 server2 kernel: [ 180.582365] [<ffffffff8174ba1f>] ? page_fault+0x1f/0x30 Apr 7 12:33:23 server2 kernel: [ 180.582366] [<ffffffff810d870a>] SyS_init_module+0x9a/0xc0 Apr 7 12:33:23 server2 kernel: [ 180.582368] [<ffffffff8174a112>] system_call_fastpath+0x12/0x17 Apr 7 12:33:23 server2 kernel: [ 180.582369] ---[ end trace f22e6c017282076b ]--- ... The system runs with 256GB RAM: # free -m total used free shared buffers cached Mem: 257918 1834 256084 0 19 44 -/+ buffers/cache: 1770 256148 Swap: 7627 0 7627 And has 2 six-core cpu's: # lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 24 On-line CPU(s) list: 0-23 Thread(s) per core: 2 Core(s) per socket: 6 Socket(s): 2 NUMA node(s): 2 Vendor ID: GenuineIntel CPU family: 6 Model: 62 Stepping: 4 CPU MHz: 2599.966 BogoMIPS: 5200.39 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 15360K NUMA node0 CPU(s): 0,2,4,6,8,10,12,14,16,18,20,22 NUMA node1 CPU(s): 1,3,5,7,9,11,13,15,17,19,21,23 Currently there is running a memtest to be sure that there is no ram issue. But it takes a while.... A strange thing: the second M620 blade which is installed on the VRTX has no problems with inserting the netconsole module. At least until today. Have you an idea how I can solve this? Many thanks Urban Loesch