Strace -ff shows a bit more. It is stuck in the epoll/gettimeofday
loop.
root@developers:~# strace -ff -p 7046
Process 7046 attached with 27 threads
[pid 7072] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7071] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7070] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7073] gettimeofday( <unfinished ...>
[pid 7069] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7067] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7073] <... gettimeofday resumed> {1413529587, 83098}, NULL) = 0
[pid 7052] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7050] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7049] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7046] read(14, <unfinished ...>
[pid 7073] epoll_wait(22, <unfinished ...>
[pid 7066] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7065] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7063] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7062] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7061] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7060] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7059] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7058] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7057] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7056] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7055] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7054] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7053] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7051] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7048] futex(0x7f7111fd5664, FUTEX_WAIT_PRIVATE, 11483, NULL <unfinished
...>
[pid 7073] <... epoll_wait resumed> {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529587, 186946}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 190070}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 190174}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529587, 290683}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 290801}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 290902}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529587, 391605}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 391981}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 392343}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529587, 493283}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 493632}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 493966}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529587, 596900}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 597255}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 597601}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529587, 698968}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 699060}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 699140}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529587, 799604}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 799733}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 799852}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529587, 902924}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 903038}, NULL) = 0
[pid 7073] gettimeofday({1413529587, 903123}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529588, 5965}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 6633}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 6716}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529588, 107412}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 107517}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 107607}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529588, 212788}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 214834}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 216261}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529588, 319335}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 321883}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 323785}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529588, 425429}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 425525}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 425608}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529588, 528376}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 530831}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 530946}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529588, 631704}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 632093}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 632452}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529588, 733882}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 734013}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 734107}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529588, 836065}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 838890}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 838993}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529588, 941837}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 941933}, NULL) = 0
[pid 7073] gettimeofday({1413529588, 942028}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529589, 42887}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 43232}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 43582}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529589, 146209}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 146491}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 146890}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529589, 249507}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 249777}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 250088}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529589, 351107}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 351407}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 351699}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529589, 452653}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 452978}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 453326}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529589, 555075}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 555191}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 555295}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529589, 656175}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 656469}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 656824}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529589, 757861}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 758229}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 758584}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529589, 860051}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 860317}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 860624}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529589, 961682}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 961952}, NULL) = 0
[pid 7073] gettimeofday({1413529589, 962267}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529590, 63895}, NULL) = 0
[pid 7073] gettimeofday({1413529590, 64010}, NULL) = 0
[pid 7073] gettimeofday({1413529590, 64115}, NULL) = 0
[pid 7073] epoll_wait(22, {}, 50, 100) = 0
[pid 7073] gettimeofday({1413529590, 164823}, NULL) = 0
[pid 7073] gettimeofday({1413529590, 165181}, NULL) = 0
[pid 7073] gettimeofday({1413529590, 165513}, NULL) = 0
[pid 7073] epoll_wait(22, ^CProcess 7046 detached
Process 7048 detached
Process 7049 detached
Process 7050 detached
Process 7051 detached
Process 7052 detached
Process 7053 detached
Process 7054 detached
Process 7055 detached
Process 7056 detached
Process 7057 detached
Process 7058 detached
Process 7059 detached
Process 7060 detached
Process 7061 detached
Process 7062 detached
Process 7063 detached
Process 7064 detached
Process 7065 detached
Process 7066 detached
Process 7067 detached
Process 7068 detached
Process 7069 detached
Process 7070 detached
Process 7071 detached
Process 7072 detached
Process 7073 detached
<detached ...>
root@developers:~#
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https://bugs.launchpad.net/bugs/1381417
Title:
mod_gnutls busy-loops consuming 100% cpu
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