runtime: failed to create new OS thread

[dragonked2]

Last Version show this error and keep flooding errors

runtime: failed to create new OS thread (have 497 already; errno=8)
fatal error: runtime.newosproc

runtime stack:
runtime.throw({0x228506e, 0x11})
        runtime/panic.go:1077 +0x4d fp=0x4b5fcd4 sp=0x4b5fcc0 pc=0x601dd
runtime.newosproc(0x295b7200)
        runtime/os_windows.go:890 +0x12c fp=0x4b5fd04 sp=0x4b5fcd4 pc=0x5c8dc
runtime.newm1(0x295b7200)
        runtime/proc.go:2455 +0xaf fp=0x4b5fd20 sp=0x4b5fd04 pc=0x66dcf
runtime.newm(0x0, 0xd453300, 0x1f0)
        runtime/proc.go:2430 +0x131 fp=0x4b5fd3c sp=0x4b5fd20 pc=0x66cc1
runtime.startm(0xd453300, 0x0, 0x0)
        runtime/proc.go:2624 +0x1c3 fp=0x4b5fd68 sp=0x4b5fd3c pc=0x67323
runtime.handoffp(0xd453300)
        runtime/proc.go:2665 +0x354 fp=0x4b5fd90 sp=0x4b5fd68 pc=0x67774
runtime.retake(0x7a01e6052adc)
        runtime/proc.go:5731 +0x22e fp=0x4b5fdc8 sp=0x4b5fd90 pc=0x6ed6e
runtime.sysmon()
        runtime/proc.go:5639 +0x4cf fp=0x4b5fe38 sp=0x4b5fdc8 pc=0x6e91f
runtime.mstart1()
        runtime/proc.go:1600 +0x7a fp=0x4b5fe48 sp=0x4b5fe38 pc=0x65b1a
runtime.mstart0()
        runtime/proc.go:1557 +0x4f fp=0x4b5fe54 sp=0x4b5fe48 pc=0x65a8f
runtime.mstart()
        runtime/asm_386.s:275 +0x5 fp=0x4b5fe58 sp=0x4b5fe54 pc=0x94515

goroutine 1 [select, 1 minutes]:
runtime.gopark(0x282243c, 0x0, 0x9, 0x18, 0x1)
        runtime/proc.go:398 +0xfd fp=0x1cfd5310 sp=0x1cfd52fc pc=0x6330d
runtime.selectgo(0x1cfd5418, 0x1cfd5410, 0x0, 0x1, 0x1, 0x1)
        runtime/select.go:327 +0xac8 fp=0x1cfd53f0 sp=0x1cfd5310 pc=0x74598
github.com/remeh/sizedwaitgroup.(*SizedWaitGroup).AddWithContext(0x14a4efa8, {0x2b8d698, 0x3fce2c0})
        github.com/remeh/sizedwaitgroup@v1.0.0/sizedwaitgroup.go:63 +0x93 fp=0x1cfd542c sp=0x1cfd53f0 pc=0xe72183
github.com/remeh/sizedwaitgroup.(*SizedWaitGroup).Add(...)
        github.com/remeh/sizedwaitgroup@v1.0.0/sizedwaitgroup.go:51
github.com/projectdiscovery/nuclei/v3/pkg/core.(*Engine).executeTemplateSpray(0xda9c360, {0x17c45500, 0x150d, 0x1540}, {0x2b8a8f4, 0xdc56280})
        github.com/projectdiscovery/nuclei/v3/pkg/core/execute_options.go:120 +0xb7 fp=0x1cfd545c sp=0x1cfd542c pc=0x1c57987
github.com/projectdiscovery/nuclei/v3/pkg/core.(*Engine).ExecuteScanWithOpts(0xda9c360, {0x1484a000, 0x1d1f, 0x2000}, {0x2b8a8f4, 0xdc56280}, 0x0)
        github.com/projectdiscovery/nuclei/v3/pkg/core/execute_options.go:91 +0x83d fp=0x1cfd56f4 sp=0x1cfd545c pc=0x1c5786d
github.com/projectdiscovery/nuclei/v3/internal/runner.(*Runner).executeTemplatesInput(0xde100c0, 0xdc579f0, 0xda9c360)
        github.com/projectdiscovery/nuclei/v3/internal/runner/runner.go:578 +0x21e fp=0x1cfd574c sp=0x1cfd56f4 pc=0x1c7b38e
github.com/projectdiscovery/nuclei/v3/internal/runner.(*Runner).runStandardEnumeration(0xde100c0, {{0x0, 0x0}, {0x0, 0x0}, {{0x0, 0x0}, {{0x0, 0x0}}, {{0x0, ...}}, ...}, ...}, ...)
        github.com/projectdiscovery/nuclei/v3/internal/runner/runner.go:326 +0xb9 fp=0x1cfd5864 sp=0x1cfd574c pc=0x1c793b9
github.com/projectdiscovery/nuclei/v3/internal/runner.(*Runner).RunEnumeration(0xde100c0)
        github.com/projectdiscovery/nuclei/v3/internal/runner/runner.go:498 +0x111c fp=0x1cfd5ecc sp=0x1cfd5864 pc=0x1c7abbc
main.main()
        ./main.go:165 +0x6e3 fp=0x1cfd5fa4 sp=0x1cfd5ecc pc=0x1c7f983
runtime.main()
        runtime/proc.go:267 +0x2b7 fp=0x1cfd5ff0 sp=0x1cfd5fa4 pc=0x62e77
runtime.goexit()
        runtime/asm_386.s:1363 +0x1 fp=0x1cfd5ff4 sp=0x1cfd5ff0 pc=0x95a21

goroutine 2 [force gc (idle), 52 minutes]:

[tarunKoyalwar]

@dragonked2 , thanks for reporting this but gopark errors like ^ are caused due to setting high concurrency which seems to be the case or system not supporting more threads due to some reason

runtime: failed to create new OS thread (have 497 already; errno=8)

reducing concurrency should fix this if it is related to nuclei , here's our guide to setting concurrency and other options https://docs.projectdiscovery.io/tools/nuclei/mass-scanning-cli

[drwetter]

I encountered the same -on a desktop. I still can do like thousand things and ulimit looks fine:

-t: cpu time (seconds)              unlimited
-f: file size (blocks)              unlimited
-d: data seg size (kbytes)          unlimited
-s: stack size (kbytes)             8192
-c: core file size (blocks)         unlimited
-m: resident set size (kbytes)      unlimited
-u: processes                       255812
-n: file descriptors                32767
-l: locked-in-memory size (kbytes)  8192
-v: address space (kbytes)          unlimited
-x: file locks                      unlimited
-i: pending signals                 255812
-q: bytes in POSIX msg queues       819200
-e: max nice                        0
-r: max rt priority                 0
-N 15:                              unlimited

And I can't run even nuclei -c 1 -u <TARGET>

[tarunKoyalwar]

@drwetter , this error is caused due to exhaustation of threads and is unlikely to happen normally and in most cases is caused by underlying bug ( like oom or too much concurrency ) ( see: golang/go#52572 (comment) )
if you are still facing the issue , pls create new issue with all the info you can provide ( stacktrace dumped ) and as much info as possible because we weren't able to reproduce these.

it would be also good if you confirm whether you are able to reproduce this on particular setup/distro or facing the same on other machines distros as well

[drwetter]

Thanks! Distro was Opensuse leap 15.6 with 64 GB RAM + 64 GB SWAP and lots of free memory. Swap used was 0 bytes. I didn't see the OOM killer in the logs -- that would also would have surprise me under these circumstances.

On a Debian 12 VM with like 4 GB RAM there was no problem.

I'll better reboot that thing and try again.