I had this hang in haproxy after trying out kernel 4.16.0-041600rc1 after starting haproxy for some minutes. Now I am back on kernel 4.15.0-10-generic and everything seems ok so far.
Adrian Veith [ 9063.536247] INFO: task haproxy:1234 blocked for more than 120 seconds. [ 9063.536334] Tainted: G C 4.16.0-041600rc1-generic #201802120030 [ 9063.536456] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 9063.536582] haproxy D 0 1234 1232 0x00000000 [ 9063.536586] Call Trace: [ 9063.536595] __schedule+0x297/0x870 [ 9063.536598] schedule+0x2c/0x80 [ 9063.536601] __lock_sock+0x7d/0xc0 [ 9063.536605] ? wait_woken+0x80/0x80 [ 9063.536607] lock_sock_nested+0x64/0x70 [ 9063.536613] getorigdst+0x59/0x230 [nf_conntrack_ipv4] [ 9063.536617] nf_getsockopt+0x4f/0x80 [ 9063.536619] ip_getsockopt+0x81/0xc0 [ 9063.536622] tcp_getsockopt+0x28/0x40 [ 9063.536624] sock_common_getsockopt+0x1a/0x20 [ 9063.536625] SyS_getsockopt+0x7d/0xe0 [ 9063.536629] do_syscall_64+0x76/0x130 [ 9063.536631] entry_SYSCALL_64_after_hwframe+0x21/0x86 [ 9063.536633] RIP: 0033:0x7fbca66f7a0a [ 9063.536635] RSP: 002b:00007ffccfe718b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 [ 9063.536637] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbca66f7a0a [ 9063.536638] RDX: 0000000000000050 RSI: 0000000000000000 RDI: 0000000000000001 [ 9063.536639] RBP: 000055c721ace048 R08: 00007ffccfe718cc R09: 0000000000000001 [ 9063.536640] R10: 000055c721ace048 R11: 0000000000000246 R12: 0000000000000000 [ 9063.536641] R13: 0000000000000001 R14: 00007ffccfe718cc R15: 0000000000908002 [ 9184.370248] INFO: task haproxy:1234 blocked for more than 120 seconds. [ 9184.370336] Tainted: G C 4.16.0-041600rc1-generic #201802120030 [ 9184.370457] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 9184.370583] haproxy D 0 1234 1232 0x00000000 [ 9184.370586] Call Trace: [ 9184.370595] __schedule+0x297/0x870 [ 9184.370598] schedule+0x2c/0x80 [ 9184.370601] __lock_sock+0x7d/0xc0 [ 9184.370605] ? wait_woken+0x80/0x80 [ 9184.370607] lock_sock_nested+0x64/0x70 [ 9184.370614] getorigdst+0x59/0x230 [nf_conntrack_ipv4] [ 9184.370617] nf_getsockopt+0x4f/0x80 [ 9184.370620] ip_getsockopt+0x81/0xc0 [ 9184.370622] tcp_getsockopt+0x28/0x40 [ 9184.370624] sock_common_getsockopt+0x1a/0x20 [ 9184.370626] SyS_getsockopt+0x7d/0xe0 [ 9184.370629] do_syscall_64+0x76/0x130 [ 9184.370632] entry_SYSCALL_64_after_hwframe+0x21/0x86 [ 9184.370634] RIP: 0033:0x7fbca66f7a0a [ 9184.370635] RSP: 002b:00007ffccfe718b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 [ 9184.370637] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbca66f7a0a [ 9184.370638] RDX: 0000000000000050 RSI: 0000000000000000 RDI: 0000000000000001 [ 9184.370639] RBP: 000055c721ace048 R08: 00007ffccfe718cc R09: 0000000000000001 [ 9184.370640] R10: 000055c721ace048 R11: 0000000000000246 R12: 0000000000000000 [ 9184.370641] R13: 0000000000000001 R14: 00007ffccfe718cc R15: 0000000000908002 [ 9305.204082] INFO: task haproxy:1234 blocked for more than 120 seconds. [ 9305.204170] Tainted: G C 4.16.0-041600rc1-generic #201802120030 [ 9305.204291] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 9305.204417] haproxy D 0 1234 1232 0x00000000 [ 9305.204421] Call Trace: [ 9305.204430] __schedule+0x297/0x870 [ 9305.204433] schedule+0x2c/0x80 [ 9305.204437] __lock_sock+0x7d/0xc0 [ 9305.204441] ? wait_woken+0x80/0x80 [ 9305.204443] lock_sock_nested+0x64/0x70 [ 9305.204449] getorigdst+0x59/0x230 [nf_conntrack_ipv4] [ 9305.204452] nf_getsockopt+0x4f/0x80 [ 9305.204455] ip_getsockopt+0x81/0xc0 [ 9305.204457] tcp_getsockopt+0x28/0x40 [ 9305.204459] sock_common_getsockopt+0x1a/0x20 [ 9305.204461] SyS_getsockopt+0x7d/0xe0 [ 9305.204464] do_syscall_64+0x76/0x130 [ 9305.204467] entry_SYSCALL_64_after_hwframe+0x21/0x86 [ 9305.204469] RIP: 0033:0x7fbca66f7a0a [ 9305.204470] RSP: 002b:00007ffccfe718b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 [ 9305.204473] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbca66f7a0a [ 9305.204474] RDX: 0000000000000050 RSI: 0000000000000000 RDI: 0000000000000001 [ 9305.204475] RBP: 000055c721ace048 R08: 00007ffccfe718cc R09: 0000000000000001 [ 9305.204475] R10: 000055c721ace048 R11: 0000000000000246 R12: 0000000000000000 [ 9305.204476] R13: 0000000000000001 R14: 00007ffccfe718cc R15: 0000000000908002 [ 9426.037943] INFO: task haproxy:1234 blocked for more than 120 seconds. [ 9426.038031] Tainted: G C 4.16.0-041600rc1-generic #201802120030 [ 9426.038151] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 9426.038277] haproxy D 0 1234 1232 0x00000000 [ 9426.038281] Call Trace: [ 9426.038291] __schedule+0x297/0x870 [ 9426.038294] schedule+0x2c/0x80 [ 9426.038298] __lock_sock+0x7d/0xc0 [ 9426.038301] ? wait_woken+0x80/0x80 [ 9426.038303] lock_sock_nested+0x64/0x70 [ 9426.038309] getorigdst+0x59/0x230 [nf_conntrack_ipv4] [ 9426.038313] nf_getsockopt+0x4f/0x80 [ 9426.038316] ip_getsockopt+0x81/0xc0 [ 9426.038318] tcp_getsockopt+0x28/0x40 [ 9426.038320] sock_common_getsockopt+0x1a/0x20 [ 9426.038322] SyS_getsockopt+0x7d/0xe0 [ 9426.038325] do_syscall_64+0x76/0x130 [ 9426.038328] entry_SYSCALL_64_after_hwframe+0x21/0x86 [ 9426.038330] RIP: 0033:0x7fbca66f7a0a [ 9426.038331] RSP: 002b:00007ffccfe718b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 [ 9426.038333] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbca66f7a0a [ 9426.038334] RDX: 0000000000000050 RSI: 0000000000000000 RDI: 0000000000000001 [ 9426.038335] RBP: 000055c721ace048 R08: 00007ffccfe718cc R09: 0000000000000001 [ 9426.038336] R10: 000055c721ace048 R11: 0000000000000246 R12: 0000000000000000 [ 9426.038337] R13: 0000000000000001 R14: 00007ffccfe718cc R15: 0000000000908002 [ 9546.872473] INFO: task haproxy:1234 blocked for more than 120 seconds. [ 9546.872561] Tainted: G C 4.16.0-041600rc1-generic #201802120030 [ 9546.872681] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 9546.872807] haproxy D 0 1234 1232 0x00000000 [ 9546.872811] Call Trace: [ 9546.872821] __schedule+0x297/0x870 [ 9546.872824] schedule+0x2c/0x80 [ 9546.872828] __lock_sock+0x7d/0xc0 [ 9546.872831] ? wait_woken+0x80/0x80 [ 9546.872833] lock_sock_nested+0x64/0x70 [ 9546.872839] getorigdst+0x59/0x230 [nf_conntrack_ipv4] [ 9546.872843] nf_getsockopt+0x4f/0x80 [ 9546.872846] ip_getsockopt+0x81/0xc0 [ 9546.872848] tcp_getsockopt+0x28/0x40 [ 9546.872850] sock_common_getsockopt+0x1a/0x20 [ 9546.872852] SyS_getsockopt+0x7d/0xe0 [ 9546.872855] do_syscall_64+0x76/0x130 [ 9546.872858] entry_SYSCALL_64_after_hwframe+0x21/0x86 [ 9546.872860] RIP: 0033:0x7fbca66f7a0a [ 9546.872861] RSP: 002b:00007ffccfe718b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 [ 9546.872864] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbca66f7a0a [ 9546.872865] RDX: 0000000000000050 RSI: 0000000000000000 RDI: 0000000000000001 [ 9546.872866] RBP: 000055c721ace048 R08: 00007ffccfe718cc R09: 0000000000000001 [ 9546.872867] R10: 000055c721ace048 R11: 0000000000000246 R12: 0000000000000000 [ 9546.872868] R13: 0000000000000001 R14: 00007ffccfe718cc R15: 0000000000908002 [ 9667.707144] INFO: task haproxy:1234 blocked for more than 120 seconds. [ 9667.707231] Tainted: G C 4.16.0-041600rc1-generic #201802120030 [ 9667.707352] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 9667.707478] haproxy D 0 1234 1232 0x00000000 [ 9667.707482] Call Trace: [ 9667.707491] __schedule+0x297/0x870 [ 9667.707494] schedule+0x2c/0x80 [ 9667.707497] __lock_sock+0x7d/0xc0 [ 9667.707501] ? wait_woken+0x80/0x80 [ 9667.707503] lock_sock_nested+0x64/0x70 [ 9667.707509] getorigdst+0x59/0x230 [nf_conntrack_ipv4] [ 9667.707513] nf_getsockopt+0x4f/0x80 [ 9667.707516] ip_getsockopt+0x81/0xc0 [ 9667.707518] tcp_getsockopt+0x28/0x40 [ 9667.707520] sock_common_getsockopt+0x1a/0x20 [ 9667.707522] SyS_getsockopt+0x7d/0xe0 [ 9667.707526] do_syscall_64+0x76/0x130 [ 9667.707528] entry_SYSCALL_64_after_hwframe+0x21/0x86 [ 9667.707530] RIP: 0033:0x7fbca66f7a0a [ 9667.707531] RSP: 002b:00007ffccfe718b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 [ 9667.707533] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbca66f7a0a [ 9667.707534] RDX: 0000000000000050 RSI: 0000000000000000 RDI: 0000000000000001 [ 9667.707535] RBP: 000055c721ace048 R08: 00007ffccfe718cc R09: 0000000000000001 [ 9667.707536] R10: 000055c721ace048 R11: 0000000000000246 R12: 0000000000000000 [ 9667.707537] R13: 0000000000000001 R14: 00007ffccfe718cc R15: 0000000000908002 [ 9788.541727] INFO: task haproxy:1234 blocked for more than 120 seconds. [ 9788.541815] Tainted: G C 4.16.0-041600rc1-generic #201802120030 [ 9788.541936] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 9788.542062] haproxy D 0 1234 1232 0x00000000 [ 9788.542065] Call Trace: [ 9788.542074] __schedule+0x297/0x870 [ 9788.542077] schedule+0x2c/0x80 [ 9788.542081] __lock_sock+0x7d/0xc0 [ 9788.542085] ? wait_woken+0x80/0x80 [ 9788.542087] lock_sock_nested+0x64/0x70 [ 9788.542092] getorigdst+0x59/0x230 [nf_conntrack_ipv4] [ 9788.542096] nf_getsockopt+0x4f/0x80 [ 9788.542099] ip_getsockopt+0x81/0xc0 [ 9788.542101] tcp_getsockopt+0x28/0x40 [ 9788.542103] sock_common_getsockopt+0x1a/0x20 [ 9788.542105] SyS_getsockopt+0x7d/0xe0 [ 9788.542109] do_syscall_64+0x76/0x130 [ 9788.542111] entry_SYSCALL_64_after_hwframe+0x21/0x86 [ 9788.542113] RIP: 0033:0x7fbca66f7a0a [ 9788.542115] RSP: 002b:00007ffccfe718b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 [ 9788.542117] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbca66f7a0a [ 9788.542118] RDX: 0000000000000050 RSI: 0000000000000000 RDI: 0000000000000001 [ 9788.542119] RBP: 000055c721ace048 R08: 00007ffccfe718cc R09: 0000000000000001 [ 9788.542120] R10: 000055c721ace048 R11: 0000000000000246 R12: 0000000000000000 [ 9788.542121] R13: 0000000000000001 R14: 00007ffccfe718cc R15: 0000000000908002 [ 9909.376116] INFO: task haproxy:1234 blocked for more than 120 seconds. [ 9909.376205] Tainted: G C 4.16.0-041600rc1-generic #201802120030 [ 9909.376326] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 9909.376452] haproxy D 0 1234 1232 0x00000000 [ 9909.376456] Call Trace: [ 9909.376465] __schedule+0x297/0x870 [ 9909.376468] schedule+0x2c/0x80 [ 9909.376471] __lock_sock+0x7d/0xc0 [ 9909.376475] ? wait_woken+0x80/0x80 [ 9909.376477] lock_sock_nested+0x64/0x70 [ 9909.376483] getorigdst+0x59/0x230 [nf_conntrack_ipv4] [ 9909.376486] nf_getsockopt+0x4f/0x80 [ 9909.376489] ip_getsockopt+0x81/0xc0 [ 9909.376491] tcp_getsockopt+0x28/0x40 [ 9909.376493] sock_common_getsockopt+0x1a/0x20 [ 9909.376495] SyS_getsockopt+0x7d/0xe0 [ 9909.376499] do_syscall_64+0x76/0x130 [ 9909.376501] entry_SYSCALL_64_after_hwframe+0x21/0x86 [ 9909.376504] RIP: 0033:0x7fbca66f7a0a [ 9909.376505] RSP: 002b:00007ffccfe718b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 [ 9909.376507] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbca66f7a0a [ 9909.376508] RDX: 0000000000000050 RSI: 0000000000000000 RDI: 0000000000000001 [ 9909.376509] RBP: 000055c721ace048 R08: 00007ffccfe718cc R09: 0000000000000001 [ 9909.376510] R10: 000055c721ace048 R11: 0000000000000246 R12: 0000000000000000 [ 9909.376511] R13: 0000000000000001 R14: 00007ffccfe718cc R15: 0000000000908002 [10030.210357] INFO: task haproxy:1234 blocked for more than 120 seconds. [10030.210445] Tainted: G C 4.16.0-041600rc1-generic #201802120030 [10030.210566] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [10030.210692] haproxy D 0 1234 1232 0x00000000 [10030.210696] Call Trace: [10030.210705] __schedule+0x297/0x870 [10030.210708] schedule+0x2c/0x80 [10030.210711] __lock_sock+0x7d/0xc0 [10030.210715] ? wait_woken+0x80/0x80 [10030.210717] lock_sock_nested+0x64/0x70 [10030.210723] getorigdst+0x59/0x230 [nf_conntrack_ipv4] [10030.210727] nf_getsockopt+0x4f/0x80 [10030.210730] ip_getsockopt+0x81/0xc0 [10030.210732] tcp_getsockopt+0x28/0x40 [10030.210734] sock_common_getsockopt+0x1a/0x20 [10030.210736] SyS_getsockopt+0x7d/0xe0 [10030.210739] do_syscall_64+0x76/0x130 [10030.210742] entry_SYSCALL_64_after_hwframe+0x21/0x86 [10030.210744] RIP: 0033:0x7fbca66f7a0a [10030.210745] RSP: 002b:00007ffccfe718b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 [10030.210747] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbca66f7a0a [10030.210748] RDX: 0000000000000050 RSI: 0000000000000000 RDI: 0000000000000001 [10030.210749] RBP: 000055c721ace048 R08: 00007ffccfe718cc R09: 0000000000000001 [10030.210750] R10: 000055c721ace048 R11: 0000000000000246 R12: 0000000000000000 [10030.210751] R13: 0000000000000001 R14: 00007ffccfe718cc R15: 0000000000908002 [10151.044481] INFO: task haproxy:1234 blocked for more than 120 seconds. [10151.044569] Tainted: G C 4.16.0-041600rc1-generic #201802120030 [10151.044690] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [10151.044815] haproxy D 0 1234 1232 0x00000000 [10151.044820] Call Trace: [10151.044829] __schedule+0x297/0x870 [10151.044832] schedule+0x2c/0x80 [10151.044836] __lock_sock+0x7d/0xc0 [10151.044840] ? wait_woken+0x80/0x80 [10151.044842] lock_sock_nested+0x64/0x70 [10151.044848] getorigdst+0x59/0x230 [nf_conntrack_ipv4] [10151.044852] nf_getsockopt+0x4f/0x80 [10151.044854] ip_getsockopt+0x81/0xc0 [10151.044856] tcp_getsockopt+0x28/0x40 [10151.044858] sock_common_getsockopt+0x1a/0x20 [10151.044860] SyS_getsockopt+0x7d/0xe0 [10151.044864] do_syscall_64+0x76/0x130 [10151.044867] entry_SYSCALL_64_after_hwframe+0x21/0x86 [10151.044869] RIP: 0033:0x7fbca66f7a0a [10151.044870] RSP: 002b:00007ffccfe718b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 [10151.044872] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbca66f7a0a [10151.044873] RDX: 0000000000000050 RSI: 0000000000000000 RDI: 0000000000000001 [10151.044874] RBP: 000055c721ace048 R08: 00007ffccfe718cc R09: 0000000000000001 [10151.044875] R10: 000055c721ace048 R11: 0000000000000246 R12: 0000000000000000 [10151.044876] R13: 0000000000000001 R14: 00007ffccfe718cc R15: 0000000000908002 [48739.429757] TCP: request_sock_TCP: Possible SYN flooding on port 25. Sending cookies. Check SNMP counters. [48739.469994] TCP: request_sock_TCP: Possible SYN flooding on port 80. Sending cookies. Check SNMP counters.
