strace on mariadb process shows errors

[marcuszan]

Hi,
When I do strace in WHM for the mariadb process I get this output, indicating some errors. Can anyone help me out to ubderstand what this is. Did lots of searching on Google but got stuck.

strace: Process 3201 attached
restart_syscall(<... resuming interrupted read ...>) = 1
accept4(21, {sa_family=AF_UNIX}, [128->2], SOCK_CLOEXEC) = 742
futex(0x555c69c07e94, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x555c69c07e90, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=20, events=POLLIN}, {fd=21, events=POLLIN}], 2, -1) = 1 ([{fd=21, revents=POLLIN}])
accept4(21, {sa_family=AF_UNIX}, [128->2], SOCK_CLOEXEC) = 742
futex(0x555c69c07e94, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x555c69c07e90, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=20, events=POLLIN}, {fd=21, events=POLLIN}], 2, -1) = 1 ([{fd=21, revents=POLLIN}])
accept4(21, {sa_family=AF_UNIX}, [128->2], SOCK_CLOEXEC) = 742
futex(0x555c69c07e94, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x555c69c07e90, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
accept4(21, 0x7ffc091e6f20, [128], SOCK_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable)
poll([{fd=20, events=POLLIN}, {fd=21, events=POLLIN}], 2, -1) = 1 ([{fd=21, revents=POLLIN}])
accept4(21, {sa_family=AF_UNIX}, [128->2], SOCK_CLOEXEC) = 742
futex(0x555c69c07e94, FUTEX_WAKE_OP_PRIVATE, 1, 1, 0x555c69c07e90, FUTEX_OP_SET<<28|0<<12|FUTEX_OP_CMP_GT<<24|0x1) = 1

 

[cPRex]

Hey there! My first question would be why are we looking at an strace of the database process? Is there some specific issue you're trying to track down that isn't showing up in the standard log files or process tracker?

The output above doesn't necessarily indicate a problem. You can find more details on that here:

Reading socket: EAGAIN: Resource temporarily unavailable

I have created a socket in C++ and I needed it to have certain connection timeout. So that's what is happening: Create socket Make it NON_BLOCKING Call connect It returns -1 and errno EINPROGRESS as

stackoverflow.com

but that output alone doesn't indicate an issue with the database system.

 

[marcuszan]

Hey there! My first question would be why are we looking at an strace of the database process? Is there some specific issue you're trying to track down that isn't showing up in the standard log files or process tracker?

The output above doesn't necessarily indicate a problem. You can find more details on that here:

Reading socket: EAGAIN: Resource temporarily unavailable

I have created a socket in C++ and I needed it to have certain connection timeout. So that's what is happening: Create socket Make it NON_BLOCKING Call connect It returns -1 and errno EINPROGRESS as

stackoverflow.com

but that output alone doesn't indicate an issue with the database system.

I was just checking a mariadb process and looked at strace. I dont have any specific issues as far as I know with mariadb. Wondered if the output indicated some error or problem, but according to the article it doesn't have to indeed as you mentioned.

Thanks !

 

[cPRex]

Thanks for that confirmation - there's nothing wrong with being curious at all, but I'm glad there was no issue either!