pktgen: Cannot create thread for cpu 0 (-4) pktgen: kernel_thread() failed for cpu 1 pktgen: Cannot create thread for cpu 1 (-4) pktgen: Initialization failed for all threads ------------[ cut here ]------------ WARNING: CPU: 0 PID: 3 at kernel/locking/mutex.c:873 __mutex_trylock_slowpath kernel/locking/mutex.c:873 [inline] WARNING: CPU: 0 PID: 3 at kernel/locking/mutex.c:873 mutex_trylock+0x2f9/0x3e0 kernel/locking/mutex.c:908 DEBUG_LOCKS_WARN_ON(in_interrupt())[ 88.517342] Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted 4.9.120-gf85543b #76 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d99ef580 ffffffff81eb8049 ffffffff83c48ac0 00000000ffffffff 0000000000000000 0000000000000000 0000000000000369 ffff8801d99ef640 ffffffff814239b5 0000000041b58ab3 ffffffff843bb7e8 ffffffff814237f6 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] panic+0x1bf/0x3bc kernel/panic.c:179 [] __warn.cold.9+0xc1/0x17f kernel/panic.c:542 [] warn_slowpath_fmt+0xc2/0x100 kernel/panic.c:565 [] __mutex_trylock_slowpath kernel/locking/mutex.c:873 [inline] [] mutex_trylock+0x2f9/0x3e0 kernel/locking/mutex.c:908 [] exp_funnel_lock kernel/rcu/tree_exp.h:256 [inline] [] _synchronize_rcu_expedited+0x339/0x840 kernel/rcu/tree_exp.h:569 [] synchronize_rcu_expedited kernel/rcu/tree_exp.h:687 [inline] [] synchronize_rcu.part.62+0xd3/0x110 kernel/rcu/tree_plugin.h:682 [] synchronize_rcu+0x27/0x90 kernel/rcu/tree_plugin.h:685 [] __l2tp_session_unhash+0x38a/0x520 net/l2tp/l2tp_core.c:1796 [] l2tp_tunnel_closeall+0x1f7/0x350 net/l2tp/l2tp_core.c:1364 [] l2tp_tunnel_destruct+0x2f2/0x590 net/l2tp/l2tp_core.c:1324 [] __sk_destruct+0x55/0x590 net/core/sock.c:1428 [] __rcu_reclaim kernel/rcu/rcu.h:118 [inline] [] rcu_do_batch kernel/rcu/tree.c:2789 [inline] [] invoke_rcu_callbacks kernel/rcu/tree.c:3053 [inline] [] __rcu_process_callbacks kernel/rcu/tree.c:3020 [inline] [] rcu_process_callbacks+0x8ae/0x12b0 kernel/rcu/tree.c:3037 [] __do_softirq+0x210/0x940 kernel/softirq.c:288 [] run_ksoftirqd+0x30/0x60 kernel/softirq.c:680 [] smpboot_thread_fn+0x5c9/0x900 kernel/smpboot.c:163 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..