Thanks for the fast reply.
I tried both kernels and was not able to trigger an Oops.
On the 4.4.0-98.121~lp1729637-generic kernel a hung task warning happened:
[ +0.750497] unregister_netdevice: waiting for lo to become free. Usage count = 1 [ +0.992665] aufs au_opts_verify:1597:dockerd[1620]: dirperm1 breaks the protection by the permission bits on the lower branch [ +0.016910] aufs au_opts_verify:1597:dockerd[1620]: dirperm1 breaks the protection by the permission bits on the lower branch [ +0.015247] aufs au_opts_verify:1597:dockerd[1592]: dirperm1 breaks the protection by the permission bits on the lower branch [ +0.006387] device veth7d3bee3 entered promiscuous mode [ +0.000923] IPv6: ADDRCONF(NETDEV_UP): veth7d3bee3: link is not ready [ +9.051406] unregister_netdevice: waiting for lo to become free. Usage count = 1 [ +10.067531] unregister_netdevice: waiting for lo to become free. Usage count = 1 [ +10.083551] unregister_netdevice: waiting for lo to become free. Usage count = 1 [Nov 3 18:53] unregister_netdevice: waiting for lo to become free. Usage count = 1 [ +8.055656] INFO: task exe:2868 blocked for more than 120 seconds. [ +0.006363] Not tainted 4.4.0-98-generic #121~lp1729637 [ +0.005970] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ +0.008347] exe D ffff88012a0e3cb8 0 2868 1 0x00000000 [ +0.000006] ffff88012a0e3cb8 ffffffff821db9a0 ffffffff81e11500 ffff8800ba25f000 [ +0.000002] ffff88012a0e4000 ffffffff81ef7a64 ffff8800ba25f000 00000000ffffffff [ +0.000002] ffffffff81ef7a68 ffff88012a0e3cd0 ffffffff818405d5 ffffffff81ef7a60 [ +0.000002] Call Trace: [ +0.000011] [<ffffffff818405d5>] schedule+0x35/0x80 [ +0.000004] [<ffffffff8184087e>] schedule_preempt_disabled+0xe/0x10 [ +0.000003] [<ffffffff818424b9>] __mutex_lock_slowpath+0xb9/0x130 [ +0.000002] [<ffffffff8184254f>] mutex_lock+0x1f/0x30 [ +0.000007] [<ffffffff8172ea8e>] copy_net_ns+0x6e/0x120 [ +0.000010] [<ffffffff810a172b>] create_new_namespaces+0x11b/0x1d0 [ +0.000001] [<ffffffff810a184d>] copy_namespaces+0x6d/0xa0 [ +0.000005] [<ffffffff8107f1d2>] copy_process+0x8e2/0x1b30 [ +0.000003] [<ffffffff810805b0>] _do_fork+0x80/0x360 [ +0.000002] [<ffffffff81080939>] SyS_clone+0x19/0x20 [ +0.000004] [<ffffffff818446f2>] entry_SYSCALL_64_fastpath+0x16/0x71 [ +1.999139] unregister_netdevice: waiting for lo to become free. Usage count = 1
Thanks for the fast reply.
I tried both kernels and was not able to trigger an Oops.
On the 4.4.0-98. 121~lp1729637- generic kernel a hung task warning happened:
[ +0.750497] unregister_ netdevice: waiting for lo to become free. Usage count = 1 verify: 1597:dockerd[ 1620]: dirperm1 breaks the protection by the permission bits on the lower branch verify: 1597:dockerd[ 1620]: dirperm1 breaks the protection by the permission bits on the lower branch verify: 1597:dockerd[ 1592]: dirperm1 breaks the protection by the permission bits on the lower branch NETDEV_ UP): veth7d3bee3: link is not ready netdevice: waiting for lo to become free. Usage count = 1 netdevice: waiting for lo to become free. Usage count = 1 netdevice: waiting for lo to become free. Usage count = 1 netdevice: waiting for lo to become free. Usage count = 1 kernel/ hung_task_ timeout_ secs" disables this message. 5d5>] schedule+0x35/0x80 87e>] schedule_ preempt_ disabled+ 0xe/0x10 4b9>] __mutex_ lock_slowpath+ 0xb9/0x130 54f>] mutex_lock+ 0x1f/0x30 a8e>] copy_net_ ns+0x6e/ 0x120 72b>] create_ new_namespaces+ 0x11b/0x1d0 84d>] copy_namespaces +0x6d/0xa0 1d2>] copy_process+ 0x8e2/0x1b30 5b0>] _do_fork+0x80/0x360 939>] SyS_clone+0x19/0x20 6f2>] entry_SYSCALL_ 64_fastpath+ 0x16/0x71 netdevice: waiting for lo to become free. Usage count = 1
[ +0.992665] aufs au_opts_
[ +0.016910] aufs au_opts_
[ +0.015247] aufs au_opts_
[ +0.006387] device veth7d3bee3 entered promiscuous mode
[ +0.000923] IPv6: ADDRCONF(
[ +9.051406] unregister_
[ +10.067531] unregister_
[ +10.083551] unregister_
[Nov 3 18:53] unregister_
[ +8.055656] INFO: task exe:2868 blocked for more than 120 seconds.
[ +0.006363] Not tainted 4.4.0-98-generic #121~lp1729637
[ +0.005970] "echo 0 > /proc/sys/
[ +0.008347] exe D ffff88012a0e3cb8 0 2868 1 0x00000000
[ +0.000006] ffff88012a0e3cb8 ffffffff821db9a0 ffffffff81e11500 ffff8800ba25f000
[ +0.000002] ffff88012a0e4000 ffffffff81ef7a64 ffff8800ba25f000 00000000ffffffff
[ +0.000002] ffffffff81ef7a68 ffff88012a0e3cd0 ffffffff818405d5 ffffffff81ef7a60
[ +0.000002] Call Trace:
[ +0.000011] [<ffffffff81840
[ +0.000004] [<ffffffff81840
[ +0.000003] [<ffffffff81842
[ +0.000002] [<ffffffff81842
[ +0.000007] [<ffffffff8172e
[ +0.000010] [<ffffffff810a1
[ +0.000001] [<ffffffff810a1
[ +0.000005] [<ffffffff8107f
[ +0.000003] [<ffffffff81080
[ +0.000002] [<ffffffff81080
[ +0.000004] [<ffffffff81844
[ +1.999139] unregister_