[Bug 1406605] Re: vsftp processes crashes Ubuntu by using all of the available memory

[Onur Boyaci]

Sorry there are lots of

INFO: task vsftpd:31878 blocked for more than 120 seconds. errors in the
kernel logs also:

Dec 30 12:09:06 localhost kernel: [  841.204124] INFO: task vsftpd:31878 blocked for more than 120 seconds.
Dec 30 12:09:06 localhost kernel: [  841.206412]       Not tainted 3.13.0-43-generic #72-Ubuntu
Dec 30 12:09:06 localhost kernel: [  841.208721] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 30 12:09:06 localhost kernel: [  841.211745] vsftpd          D ffff88078fc33480     0 31878    878 0x00000000
Dec 30 12:09:06 localhost kernel: [  841.211749]  ffff8806d8dd9d40 0000000000000086 ffff880754cf4800 ffff8806d8dd9fd8
Dec 30 12:09:06 localhost kernel: [  841.211753]  0000000000013480 0000000000013480 ffff880754cf4800 ffffffff81cdb7a0
Dec 30 12:09:06 localhost kernel: [  841.211756]  ffffffff81cdb7a4 ffff880754cf4800 00000000ffffffff ffffffff81cdb7a8
Dec 30 12:09:06 localhost kernel: [  841.211760] Call Trace:
Dec 30 12:09:06 localhost kernel: [  841.211769]  [<ffffffff81725539>] schedule_preempt_disabled+0x29/0x70
Dec 30 12:09:06 localhost kernel: [  841.211772]  [<ffffffff817273a5>] __mutex_lock_slowpath+0x135/0x1b0
Dec 30 12:09:06 localhost kernel: [  841.211777]  [<ffffffff811a2929>] ? __kmalloc+0x1e9/0x230
Dec 30 12:09:06 localhost kernel: [  841.211779]  [<ffffffff8172743f>] mutex_lock+0x1f/0x2f
Dec 30 12:09:06 localhost kernel: [  841.211784]  [<ffffffff8161db61>] copy_net_ns+0x71/0x130
Dec 30 12:09:06 localhost kernel: [  841.211788]  [<ffffffff8108f899>] create_new_namespaces+0xf9/0x180
Dec 30 12:09:06 localhost kernel: [  841.211791]  [<ffffffff8108f993>] copy_namespaces+0x73/0xa0
Dec 30 12:09:06 localhost kernel: [  841.211795]  [<ffffffff81065b16>] copy_process.part.26+0x9a6/0x16b0
Dec 30 12:09:06 localhost kernel: [  841.211797]  [<ffffffff810669f5>] do_fork+0xd5/0x340
Dec 30 12:09:06 localhost kernel: [  841.211800]  [<ffffffff81066ce6>] SyS_clone+0x16/0x20
Dec 30 12:09:06 localhost kernel: [  841.211804]  [<ffffffff81731a09>] stub_clone+0x69/0x90
Dec 30 12:09:06 localhost kernel: [  841.211806]  [<ffffffff817316ad>] ? system_call_fastpath+0x1a/0x1f
Dec 30 12:09:06 localhost kernel: [  841.211809] INFO: task vsftpd:31886 blocked for more than 120 seconds.
Dec 30 12:09:06 localhost kernel: [  841.214584]       Not tainted 3.13.0-43-generic #72-Ubuntu
Dec 30 12:09:06 localhost kernel: [  841.216778] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Dec 30 12:09:06 localhost kernel: [  841.220142] vsftpd          D ffff88078fc13480     0 31886    878 0x00000000
Dec 30 12:09:06 localhost kernel: [  841.220146]  ffff88069cff7d40 0000000000000082 ffff880662351800 ffff88069cff7fd8
Dec 30 12:09:06 localhost kernel: [  841.220149]  0000000000013480 0000000000013480 ffff880662351800 ffffffff81cdb7a0
Dec 30 12:09:06 localhost kernel: [  841.220152]  ffffffff81cdb7a4 ffff880662351800 00000000ffffffff ffffffff81cdb7a8
Dec 30 12:09:06 localhost kernel: [  841.220156] Call Trace:
Dec 30 12:09:06 localhost kernel: [  841.220160]  [<ffffffff81725539>] schedule_preempt_disabled+0x29/0x70
Dec 30 12:09:06 localhost kernel: [  841.220163]  [<ffffffff817273a5>] __mutex_lock_slowpath+0x135/0x1b0
Dec 30 12:09:06 localhost kernel: [  841.220166]  [<ffffffff811a2929>] ? __kmalloc+0x1e9/0x230
Dec 30 12:09:06 localhost kernel: [  841.220169]  [<ffffffff8172743f>] mutex_lock+0x1f/0x2f
Dec 30 12:09:06 localhost kernel: [  841.220172]  [<ffffffff8161db61>] copy_net_ns+0x71/0x130
Dec 30 12:09:06 localhost kernel: [  841.220175]  [<ffffffff8108f899>] create_new_namespaces+0xf9/0x180
Dec 30 12:09:06 localhost kernel: [  841.220178]  [<ffffffff8108f993>] copy_namespaces+0x73/0xa0
Dec 30 12:09:06 localhost kernel: [  841.220181]  [<ffffffff81065b16>] copy_process.part.26+0x9a6/0x16b0
Dec 30 12:09:06 localhost kernel: [  841.220184]  [<ffffffff810669f5>] do_fork+0xd5/0x340
Dec 30 12:09:06 localhost kernel: [  841.220188]  [<ffffffff81066ce6>] SyS_clone+0x16/0x20
Dec 30 12:09:06 localhost kernel: [  841.220191]  [<ffffffff81731a09>] stub_clone+0x69/0x90
Dec 30 12:09:06 localhost kernel: [  841.220194]  [<ffffffff817316ad>] ? system_call_fastpath+0x1a/0x1f

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Title:
  vsftp processes crashes Ubuntu by using all of the available memory

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