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| Started by | Alexander Duyck <alexander.duyck@gmail.com> |
|---|---|
| First post | 2016-05-27 20:30 +0200 |
| Last post | 2016-05-27 20:30 +0200 |
| Articles | 1 — 1 participant |
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Deadlock when running DevStack on latest pull of net tree Alexander Duyck <alexander.duyck@gmail.com> - 2016-05-27 20:30 +0200
| From | Alexander Duyck <alexander.duyck@gmail.com> |
|---|---|
| Date | 2016-05-27 20:30 +0200 |
| Subject | Deadlock when running DevStack on latest pull of net tree |
| Message-ID | <rDuGe-6SR-13@gated-at.bofh.it> |
I started out this morning by trying to run DevStack on the latest
"net' kernel and it looks like I am hanging on some sort of locking
problem with RabbitMQ. Specifically I am seeing one CPU jump to 100%
with perf showing that I am spinning on a lock.
I'm working to bisect it now, but just thought I would put it out
there if anybody had already root caused this issue. Below is a few
traces to the spin lock call on the spinning CPU:
- 18.81% 18.81% beam.smp [kernel.vmlinux] [k] _raw_spin_lock_irqsave
- _raw_spin_lock_irqsave
- 32.86% add_wait_queue
n_tty_write
tty_write
do_loop_readv_writev
do_readv_writev
vfs_writev
do_writev
sys_writev
do_syscall_64
return_from_SYSCALL_64
__libc_writev
- 32.49% remove_wait_queue
n_tty_write
tty_write
do_loop_readv_writev
do_readv_writev
vfs_writev
do_writev
sys_writev
do_syscall_64
return_from_SYSCALL_64
__libc_writev
- 31.71% __wake_up
tty_write_unlock
tty_write
do_loop_readv_writev
do_readv_writev
vfs_writev
do_writev
sys_writev
do_syscall_64
return_from_SYSCALL_64
__libc_writev
- 1.96% n_tty_write
tty_write
do_loop_readv_writev
do_readv_writev
vfs_writev
do_writev
sys_writev
do_syscall_64
return_from_SYSCALL_64
__libc_writev
- 0.87% tty_write_unlock
tty_write
do_loop_readv_writev
do_readv_writev
vfs_writev
do_writev
sys_writev
do_syscall_64
return_from_SYSCALL_64
__libc_writev
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