This was in the log of my system boot today:
May 23 08:25:08 debianhost kernel: [ 240.104042] INFO: task
modprobe:776 blocked for more than 120 seconds.
May 23 08:25:08 debianhost kernel: [ 240.104049] Tainted: G
E 4.5.0-2-amd64 #1
May 23 08:25:08 debianhost kernel: [ 240.104051] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 23 08:25:08 debianhost kernel: [ 240.104054] modprobe D
ffff88007fa15980 0 776 98 0x00000000
May 23 08:25:08 debianhost kernel: [ 240.104060] ffff880078e4e600
ffffffff81a12500 ffff88007b20c000 ffff88007b20bc88
May 23 08:25:08 debianhost kernel: [ 240.104065] ffffffff81ad9ae4
ffff880078e4e600 00000000ffffffff ffffffff81ad9ae8
May 23 08:25:08 debianhost kernel: [ 240.104069] ffffffff815b36e1
ffffffff81ad9ae0 ffffffff815b396a ffffffff815b53f4
May 23 08:25:08 debianhost kernel: [ 240.104073] Call Trace:
May 23 08:25:08 debianhost kernel: [ 240.104083]
[<ffffffff815b36e1>] ? schedule+0x31/0x80
May 23 08:25:08 debianhost kernel: [ 240.104087]
[<ffffffff815b396a>] ? schedule_preempt_disabled+0xa/0x10
May 23 08:25:08 debianhost kernel: [ 240.104091]
[<ffffffff815b53f4>] ? __mutex_lock_slowpath+0xb4/0x130
May 23 08:25:08 debianhost kernel: [ 240.104099]
[<ffffffffc06e600c>] ? nf_conntrack_ipv4_compat_init+0xc/0xc
[nf_conntrack_ipv4]
May 23 08:25:08 debianhost kernel: [ 240.104103]
[<ffffffff815b548b>] ? mutex_lock+0x1b/0x30
May 23 08:25:08 debianhost kernel: [ 240.104108]
[<ffffffff814b0aa5>] ? register_pernet_subsys+0x15/0x40
May 23 08:25:08 debianhost kernel: [ 240.104112]
[<ffffffffc06e6048>] ? nf_conntrack_l3proto_ipv4_init+0x3c/0xff4
[nf_conntrack_ipv4]
May 23 08:25:08 debianhost kernel: [ 240.104117]
[<ffffffff81002122>] ? do_one_initcall+0xb2/0x200
May 23 08:25:08 debianhost kernel: [ 240.104122]
[<ffffffff8116a27a>] ? do_init_module+0x5b/0x1ce
May 23 08:25:08 debianhost kernel: [ 240.104126]
[<ffffffff810f98f6>] ? load_module+0x2146/0x2790
May 23 08:25:08 debianhost kernel: [ 240.104129]
[<ffffffff810f6450>] ? __symbol_put+0x60/0x60
May 23 08:25:08 debianhost kernel: [ 240.104133]
[<ffffffff810f68a8>] ? copy_module_from_fd.isra.51+0xf8/0x140
May 23 08:25:08 debianhost kernel: [ 240.104137]
[<ffffffff810fa158>] ? SYSC_finit_module+0xa8/0xd0
May 23 08:25:08 debianhost kernel: [ 240.104141]
[<ffffffff815b7472>] ? system_call_fast_compare_end+0xc/0x67
May 23 08:25:08 debianhost kernel: [ 240.104145] INFO: task
(ostnamed):780 blocked for more than 120 seconds.
May 23 08:25:08 debianhost kernel: [ 240.104148] Tainted: G
E 4.5.0-2-amd64 #1
May 23 08:25:08 debianhost kernel: [ 240.104150] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 23 08:25:08 debianhost kernel: [ 240.104151] (ostnamed) D
0000000000000000 0 780 1 0x00000004
May 23 08:25:08 debianhost kernel: [ 240.104156] ffff8800797d7040
ffff88007a7aed40 ffff880036688000 ffff880036687dd8
May 23 08:25:08 debianhost kernel: [ 240.104160] ffffffffc04635a4
ffff8800797d7040 00000000ffffffff ffffffffc04635a8
May 23 08:25:08 debianhost kernel: [ 240.104164] ffffffff815b36e1
ffffffffc04635a0 ffffffff815b396a ffffffff815b53f4
May 23 08:25:08 debianhost kernel: [ 240.104168] Call Trace:
May 23 08:25:08 debianhost kernel: [ 240.104172]
[<ffffffff815b36e1>] ? schedule+0x31/0x80
May 23 08:25:08 debianhost kernel: [ 240.104176]
[<ffffffff815b396a>] ? schedule_preempt_disabled+0xa/0x10
May 23 08:25:08 debianhost kernel: [ 240.104179]
[<ffffffff815b53f4>] ? __mutex_lock_slowpath+0xb4/0x130
May 23 08:25:08 debianhost kernel: [ 240.104183]
[<ffffffff815b548b>] ? mutex_lock+0x1b/0x30
May 23 08:25:08 debianhost kernel: [ 240.104191]
[<ffffffffc04a0833>] ? nft_register_afinfo+0x23/0x50 [nf_tables]
May 23 08:25:08 debianhost kernel: [ 240.104196]
[<ffffffffc046611d>] ? nf_tables_ipv4_init_net+0xed/0x110
[nf_tables_ipv4]
May 23 08:25:08 debianhost kernel: [ 240.104199]
[<ffffffff814b06f9>] ? ops_init+0x39/0x100
May 23 08:25:08 debianhost kernel: [ 240.104202]
[<ffffffff814b0845>] ? setup_net+0x85/0x130
May 23 08:25:08 debianhost kernel: [ 240.104205]
[<ffffffff814b10d4>] ? copy_net_ns+0x74/0x100
May 23 08:25:08 debianhost kernel: [ 240.104209]
[<ffffffff8109768b>] ? create_new_namespaces+0xfb/0x190
May 23 08:25:08 debianhost kernel: [ 240.104212]
[<ffffffff81097875>] ? unshare_nsproxy_namespaces+0x55/0xa0
May 23 08:25:08 debianhost kernel: [ 240.104216]
[<ffffffff81078a07>] ? SyS_unshare+0x1e7/0x390
May 23 08:25:08 debianhost kernel: [ 240.104220]
[<ffffffff815b7472>] ? system_call_fast_compare_end+0xc/0x67
May 23 08:25:08 debianhost kernel: [ 240.104224] INFO: task
modprobe:791 blocked for more than 120 seconds.
May 23 08:25:08 debianhost kernel: [ 240.104226] Tainted: G
E 4.5.0-2-amd64 #1
May 23 08:25:08 debianhost kernel: [ 240.104228] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 23 08:25:08 debianhost kernel: [ 240.104230] modprobe D
ffff88007fa95980 0 791 102 0x00000000
May 23 08:25:08 debianhost kernel: [ 240.104234] ffff88007942e600
ffff88007c8ece00 ffff88007b0c8000 ffff88007b0c7c88
May 23 08:25:08 debianhost kernel: [ 240.104238] ffffffff81ad9ae4
ffff88007942e600 00000000ffffffff ffffffff81ad9ae8
May 23 08:25:08 debianhost kernel: [ 240.104242] ffffffff815b36e1
ffffffff81ad9ae0 ffffffff815b396a ffffffff815b53f4
May 23 08:25:08 debianhost kernel: [ 240.104246] Call Trace:
May 23 08:25:08 debianhost kernel: [ 240.104250]
[<ffffffff815b36e1>] ? schedule+0x31/0x80
May 23 08:25:08 debianhost kernel: [ 240.104254]
[<ffffffff815b396a>] ? schedule_preempt_disabled+0xa/0x10
May 23 08:25:08 debianhost kernel: [ 240.104257]
[<ffffffff815b53f4>] ? __mutex_lock_slowpath+0xb4/0x130
May 23 08:25:08 debianhost kernel: [ 240.104261]
[<ffffffffc06fd000>] ? 0xffffffffc06fd000
May 23 08:25:08 debianhost kernel: [ 240.104264]
[<ffffffff815b548b>] ? mutex_lock+0x1b/0x30
May 23 08:25:08 debianhost kernel: [ 240.104267]
[<ffffffff814b0aa5>] ? register_pernet_subsys+0x15/0x40
May 23 08:25:08 debianhost kernel: [ 240.104273]
[<ffffffffc06fd00d>] ? nfnetlink_log_init+0xd/0x1000 [nfnetlink_log]
May 23 08:25:08 debianhost kernel: [ 240.104276]
[<ffffffff81002122>] ? do_one_initcall+0xb2/0x200
May 23 08:25:08 debianhost kernel: [ 240.104280]
[<ffffffff8116a27a>] ? do_init_module+0x5b/0x1ce
May 23 08:25:08 debianhost kernel: [ 240.104283]
[<ffffffff810f98f6>] ? load_module+0x2146/0x2790
May 23 08:25:08 debianhost kernel: [ 240.104286]
[<ffffffff810f6450>] ? __symbol_put+0x60/0x60
May 23 08:25:08 debianhost kernel: [ 240.104290]
[<ffffffff810f68a8>] ? copy_module_from_fd.isra.51+0xf8/0x140
May 23 08:25:08 debianhost kernel: [ 240.104294]
[<ffffffff810fa158>] ? SYSC_finit_module+0xa8/0xd0
May 23 08:25:08 debianhost kernel: [ 240.104297]
[<ffffffff815b7472>] ? system_call_fast_compare_end+0xc/0x67
May 23 08:25:08 debianhost kernel: [ 240.104315] INFO: task
(t-daemon):1319 blocked for more than 120 seconds.
May 23 08:25:08 debianhost kernel: [ 240.104318] Tainted: G
E 4.5.0-2-amd64 #1
May 23 08:25:08 debianhost kernel: [ 240.104319] "echo 0 >
/proc/sys/kernel/hung_task_timeout_secs" disables this message.
May 23 08:25:08 debianhost kernel: [ 240.104321] (t-daemon) D
0000000000000000 0 1319 1 0x00000004
May 23 08:25:08 debianhost kernel: [ 240.104325] ffff8800790ba400
ffff880079e69140 ffff88005d8a8000 ffff88005d8a7e70
May 23 08:25:08 debianhost kernel: [ 240.104329] ffffffff81ad9ae4
ffff8800790ba400 00000000ffffffff ffffffff81ad9ae8
May 23 08:25:08 debianhost kernel: [ 240.104333] ffffffff815b36e1
ffffffff81ad9ae0 ffffffff815b396a ffffffff815b53f4
May 23 08:25:08 debianhost kernel: [ 240.104337] Call Trace:
May 23 08:25:08 debianhost kernel: [ 240.104341]
[<ffffffff815b36e1>] ? schedule+0x31/0x80
May 23 08:25:08 debianhost kernel: [ 240.104344]
[<ffffffff815b396a>] ? schedule_preempt_disabled+0xa/0x10
May 23 08:25:08 debianhost kernel: [ 240.104348]
[<ffffffff815b53f4>] ? __mutex_lock_slowpath+0xb4/0x130
May 23 08:25:08 debianhost kernel: [ 240.104351]
[<ffffffff815b548b>] ? mutex_lock+0x1b/0x30
May 23 08:25:08 debianhost kernel: [ 240.104355]
[<ffffffff814b10c9>] ? copy_net_ns+0x69/0x100
May 23 08:25:08 debianhost kernel: [ 240.104358]
[<ffffffff8109768b>] ? create_new_namespaces+0xfb/0x190
May 23 08:25:08 debianhost kernel: [ 240.104361]
[<ffffffff81097875>] ? unshare_nsproxy_namespaces+0x55/0xa0
May 23 08:25:08 debianhost kernel: [ 240.104364]
[<ffffffff81078a07>] ? SyS_unshare+0x1e7/0x390
May 23 08:25:08 debianhost kernel: [ 240.104368]
[<ffffffff815b7472>] ? system_call_fast_compare_end+0xc/0x67
--
Arturo Borrero González
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