syscall: strace hangs trying to trace call to Exec

[bkatkam123]

What version of Go are you using (go version)?

$ go version
go version go1.17.3 linux/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output

$ go env
GO111MODULE=""
GOARCH="amd64"
GOBIN=""
GOCACHE="/home/bkatkam/.cache/go-build"
GOENV="/home/bkatkam/.config/go/env"
GOEXE=""
GOEXPERIMENT=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="linux"
GOINSECURE=""
GOMODCACHE="/home/bkatkam/go/pkg/mod"
GONOPROXY=""
GONOSUMDB=""
GOOS="linux"
GOPATH="/home/bkatkam/go"
GOPRIVATE=""
GOPROXY="https://proxy.golang.org,direct"
GOROOT="/ce/lang/go/1.17.3/build_0"
GOSUMDB="sum.golang.org"
GOTMPDIR=""
GOTOOLDIR="/ce/lang/go/1.17.3/build_0/pkg/tool/linux_amd64"
GOVCS=""
GOVERSION="go1.17.3"
GCCGO="gccgo"
AR="ar"
CC="gcc"
CXX="g++"
CGO_ENABLED="1"
GOMOD="/dev/null"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fmessage-length=0 -fdebug-prefix-map=/tmp/go-build467517364=/tmp/go-build -gno-record-gcc-switches"

What did you do?

my code Output

package main
import (
    "os"
    "syscall"
)
func main() {
    args := []string{"ls", "-ld"}
    env := os.Environ()
    syscall.Exec("/usr/bin/ls", args, env)
}

When I run 'strace -f ./exec-ls' on this built executable, with '-f' to follow sub-processes, strace is getting stuck.

What did you expect to see?

Expecting strace to run.

What did you see instead?

strace getting stuck when -f option is used.

[ianlancetaylor]

What version of Linux? What version of strace? Note that Go 1.17 is no longer supported, though I don't know why that would matter.

This works fine for me on Ubuntu 20.04.6 LTS.

> cat foo.go
package main
import (
    "os"
    "syscall"
)
func main() {
    args := []string{"ls", "-ld"}
    env := os.Environ()
    syscall.Exec("/usr/bin/ls", args, env)
}
> go build foo.go
> strace -f ./foo
execve("./foo", ["./foo"], 0x7ffda8f3b938 /* 28 vars */) = 0
arch_prctl(ARCH_SET_FS, 0x4db0b0)       = 0
sched_getaffinity(0, 8192, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]) = 8
openat(AT_FDCWD, "/sys/kernel/mm/transparent_hugepage/hpage_pmd_size", O_RDONLY) = 3
read(3, "2097152\n", 20)                = 8
close(3)                                = 0
mmap(NULL, 262144, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1f01026000
mmap(NULL, 131072, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1f01006000
mmap(NULL, 1048576, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1f00f06000
mmap(NULL, 8388608, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1f00706000
mmap(NULL, 67108864, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1efc706000
mmap(NULL, 536870912, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1edc706000
mmap(NULL, 8388608, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1edbf06000
mmap(0xc000000000, 67108864, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xc000000000
mmap(NULL, 33554432, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1ed9f06000
mmap(NULL, 1133584, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1ed9df1000
mmap(0xc000000000, 4194304, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0xc000000000
mmap(0x7f1f01006000, 131072, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f1f01006000
mmap(0x7f1f00f86000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f1f00f86000
mmap(0x7f1f00b0c000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f1f00b0c000
mmap(0x7f1efe736000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f1efe736000
mmap(0x7f1eec886000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f1eec886000
mmap(0x7f1edbf06000, 4222976, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f1edbf06000
madvise(0x7f1edc000000, 2097152, MADV_HUGEPAGE) = 0
mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1ed9cf1000
mmap(NULL, 65536, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1ed9ce1000
mmap(NULL, 65536, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f1ed9cd1000
rt_sigprocmask(SIG_SETMASK, NULL, [], 8) = 0
sigaltstack(NULL, {ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=0}) = 0
sigaltstack({ss_sp=0xc000008000, ss_flags=0, ss_size=32768}, NULL) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
gettid()                                = 1003953
rt_sigaction(SIGHUP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGHUP, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGINT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGINT, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGQUIT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGQUIT, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGILL, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGILL, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGTRAP, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGTRAP, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGABRT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGABRT, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGBUS, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGBUS, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGFPE, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGFPE, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGUSR1, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGUSR1, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGSEGV, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGSEGV, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGUSR2, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGUSR2, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGPIPE, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGPIPE, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGALRM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGALRM, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGTERM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGTERM, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGSTKFLT, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGSTKFLT, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGCHLD, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGCHLD, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGURG, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGURG, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGXCPU, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGXCPU, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGXFSZ, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGXFSZ, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGVTALRM, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGVTALRM, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGPROF, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGPROF, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGWINCH, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGWINCH, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGIO, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGIO, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGPWR, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGPWR, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGSYS, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGSYS, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRTMIN, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_1, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_1, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_2, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_3, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_3, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_4, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_4, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_5, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_5, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_6, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_6, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_7, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_7, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_8, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_8, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_9, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_9, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_10, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_10, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_11, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_11, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_12, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_12, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_13, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_13, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_14, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_14, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_15, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_15, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_16, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_16, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_17, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_17, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_18, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_18, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_19, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_19, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_20, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_20, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_21, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_21, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_22, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_22, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_23, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_23, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_24, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_24, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_25, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_25, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_26, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_26, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_27, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_27, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_28, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_28, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_29, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_29, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_30, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_30, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_31, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_31, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigaction(SIGRT_32, NULL, {sa_handler=SIG_DFL, sa_mask=[], sa_flags=0}, 8) = 0
rt_sigaction(SIGRT_32, {sa_handler=0x458d20, sa_mask=~[], sa_flags=SA_RESTORER|SA_ONSTACK|SA_RESTART|SA_SIGINFO, sa_restorer=0x458e60}, NULL, 8) = 0
rt_sigprocmask(SIG_SETMASK, ~[], [], 8) = 0
clone(child_stack=0xc000066000, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLSstrace: Process 1003954 attached
, tls=0xc000056090) = 1003954
[pid 1003954] gettid( <unfinished ...>
[pid 1003953] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 1003954] <... gettid resumed>)     = 1003954
[pid 1003953] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 1003954] sigaltstack(NULL, {ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=0}) = 0
[pid 1003954] sigaltstack({ss_sp=0xc000058000, ss_flags=0, ss_size=32768},  <unfinished ...>
[pid 1003953] rt_sigprocmask(SIG_SETMASK, ~[],  <unfinished ...>
[pid 1003954] <... sigaltstack resumed>NULL) = 0
[pid 1003953] <... rt_sigprocmask resumed>[], 8) = 0
[pid 1003954] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 1003953] clone(child_stack=0xc000068000, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS <unfinished ...>
[pid 1003954] <... rt_sigprocmask resumed>NULL, 8) = 0
strace: Process 1003955 attached
[pid 1003954] gettid( <unfinished ...>
[pid 1003953] <... clone resumed>, tls=0xc000056490) = 1003955
[pid 1003955] gettid( <unfinished ...>
[pid 1003953] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 1003955] <... gettid resumed>)     = 1003955
[pid 1003954] <... gettid resumed>)     = 1003954
[pid 1003953] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 1003955] sigaltstack(NULL, {ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=0}) = 0
[pid 1003953] rt_sigprocmask(SIG_SETMASK, ~[],  <unfinished ...>
[pid 1003955] sigaltstack({ss_sp=0xc000068000, ss_flags=0, ss_size=32768},  <unfinished ...>
[pid 1003954] nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
[pid 1003953] <... rt_sigprocmask resumed>[], 8) = 0
[pid 1003955] <... sigaltstack resumed>NULL) = 0
[pid 1003953] clone(child_stack=0xc000062000, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS <unfinished ...>
[pid 1003955] rt_sigprocmask(SIG_SETMASK, [], strace: Process 1003956 attached
NULL, 8) = 0
[pid 1003953] <... clone resumed>, tls=0xc000056890) = 1003956
[pid 1003956] gettid( <unfinished ...>
[pid 1003953] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 1003955] gettid( <unfinished ...>
[pid 1003953] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 1003956] <... gettid resumed>)     = 1003956
[pid 1003953] futex(0x4db168, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 1003955] <... gettid resumed>)     = 1003955
[pid 1003954] <... nanosleep resumed>NULL) = 0
[pid 1003956] sigaltstack(NULL, {ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=0}) = 0
[pid 1003955] mmap(NULL, 262144, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0 <unfinished ...>
[pid 1003956] sigaltstack({ss_sp=0xc000076000, ss_flags=0, ss_size=32768},  <unfinished ...>
[pid 1003955] <... mmap resumed>)       = 0x7f1ed9c91000
[pid 1003954] nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
[pid 1003956] <... sigaltstack resumed>NULL) = 0
[pid 1003956] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 1003955] rt_sigprocmask(SIG_SETMASK, ~[],  <unfinished ...>
[pid 1003956] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 1003955] <... rt_sigprocmask resumed>[], 8) = 0
[pid 1003956] gettid( <unfinished ...>
[pid 1003955] clone(child_stack=0xc000092000, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS <unfinished ...>
[pid 1003956] <... gettid resumed>)     = 1003956
[pid 1003954] <... nanosleep resumed>NULL) = 0
strace: Process 1003957 attached
[pid 1003956] futex(0x4db168, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 1003954] nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
[pid 1003953] <... futex resumed>)      = 0
[pid 1003957] gettid( <unfinished ...>
[pid 1003956] <... futex resumed>)      = 1
[pid 1003955] <... clone resumed>, tls=0xc000080090) = 1003957
[pid 1003953] rt_sigprocmask(SIG_SETMASK, ~[],  <unfinished ...>
[pid 1003957] <... gettid resumed>)     = 1003957
[pid 1003956] futex(0xc000056948, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 1003953] <... rt_sigprocmask resumed>[], 8) = 0
[pid 1003955] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 1003953] clone(child_stack=0xc000064000, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS <unfinished ...>
[pid 1003957] sigaltstack(NULL,  <unfinished ...>
[pid 1003954] <... nanosleep resumed>NULL) = 0
[pid 1003957] <... sigaltstack resumed>{ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=0}) = 0
[pid 1003955] <... rt_sigprocmask resumed>NULL, 8) = 0
strace: Process 1003958 attached
[pid 1003957] sigaltstack({ss_sp=0xc000084000, ss_flags=0, ss_size=32768},  <unfinished ...>
[pid 1003954] nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
[pid 1003953] <... clone resumed>, tls=0xc000056c90) = 1003958
[pid 1003958] gettid( <unfinished ...>
[pid 1003957] <... sigaltstack resumed>NULL) = 0
[pid 1003953] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 1003958] <... gettid resumed>)     = 1003958
[pid 1003953] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 1003957] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 1003953] futex(0x4db168, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 1003958] sigaltstack(NULL,  <unfinished ...>
[pid 1003953] <... futex resumed>)      = -1 EAGAIN (Resource temporarily unavailable)
[pid 1003957] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 1003955] futex(0x4db168, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 1003954] <... nanosleep resumed>NULL) = 0
[pid 1003958] <... sigaltstack resumed>{ss_sp=NULL, ss_flags=SS_DISABLE, ss_size=0}) = 0
[pid 1003957] gettid( <unfinished ...>
[pid 1003955] <... futex resumed>)      = 0
[pid 1003953] fcntl(0, F_GETFL <unfinished ...>
[pid 1003958] sigaltstack({ss_sp=0xc000100000, ss_flags=0, ss_size=32768},  <unfinished ...>
[pid 1003957] <... gettid resumed>)     = 1003957
[pid 1003954] nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
[pid 1003953] <... fcntl resumed>)      = 0x2 (flags O_RDWR)
[pid 1003958] <... sigaltstack resumed>NULL) = 0
[pid 1003957] futex(0xc000080148, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 1003955] futex(0xc000056548, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 1003953] futex(0xc000080148, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 1003958] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid 1003953] <... futex resumed>)      = 1
[pid 1003957] <... futex resumed>)      = 0
[pid 1003958] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid 1003953] fcntl(1, F_GETFL <unfinished ...>
[pid 1003957] futex(0xc000056548, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 1003954] <... nanosleep resumed>NULL) = 0
[pid 1003953] <... fcntl resumed>)      = 0x2 (flags O_RDWR)
[pid 1003958] gettid( <unfinished ...>
[pid 1003957] <... futex resumed>)      = 1
[pid 1003955] <... futex resumed>)      = 0
[pid 1003953] fcntl(2, F_GETFL <unfinished ...>
[pid 1003958] <... gettid resumed>)     = 1003958
[pid 1003957] futex(0xc000080148, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 1003954] nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
[pid 1003953] <... fcntl resumed>)      = 0x2 (flags O_RDWR)
[pid 1003958] futex(0xc000056d48, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 1003955] futex(0xc000056548, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...>
[pid 1003953] getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=1024*1024}) = 0
[pid 1003953] setrlimit(RLIMIT_NOFILE, {rlim_cur=1024*1024, rlim_max=1024*1024} <unfinished ...>
[pid 1003954] <... nanosleep resumed>NULL) = 0
[pid 1003953] <... setrlimit resumed>)  = 0
[pid 1003954] nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
[pid 1003953] execve("/usr/bin/ls", ["ls", "-ld"], 0xc0000b6000 /* 28 vars */ <unfinished ...>
[pid 1003954] <... nanosleep resumed>NULL) = 0
[pid 1003954] nanosleep({tv_sec=0, tv_nsec=20000},  <unfinished ...>
[pid 1003957] <... futex resumed>)      = ?
[pid 1003956] <... futex resumed>)      = ?
[pid 1003955] <... futex resumed>)      = ?
[pid 1003954] <... nanosleep resumed> <unfinished ...>) = ?
[pid 1003958] <... futex resumed>)      = ?
[pid 1003957] +++ exited with 0 +++
[pid 1003956] +++ exited with 0 +++
[pid 1003955] +++ exited with 0 +++
[pid 1003954] +++ exited with 0 +++
[pid 1003958] +++ exited with 0 +++
<... execve resumed>)                   = 0
brk(NULL)                               = 0x5631dcff8000
arch_prctl(0x3001 /* ARCH_??? */, 0x7fff127e1250) = -1 EINVAL (Invalid argument)
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=108451, ...}) = 0
mmap(NULL, 108451, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fc19e871000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libselinux.so.1", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@p\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=163200, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc19e86f000
mmap(NULL, 174600, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc19e844000
mprotect(0x7fc19e84a000, 135168, PROT_NONE) = 0
mmap(0x7fc19e84a000, 102400, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7fc19e84a000
mmap(0x7fc19e863000, 28672, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1f000) = 0x7fc19e863000
mmap(0x7fc19e86b000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x26000) = 0x7fc19e86b000
mmap(0x7fc19e86d000, 6664, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc19e86d000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300A\2\0\0\0\0\0"..., 832) = 832
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
pread64(3, "\4\0\0\0\20\0\0\0\5\0\0\0GNU\0\2\0\0\300\4\0\0\0\3\0\0\0\0\0\0\0", 32, 848) = 32
pread64(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0\30x\346\264ur\f|Q\226\236i\253-'o"..., 68, 880) = 68
fstat(3, {st_mode=S_IFREG|0755, st_size=2029592, ...}) = 0
pread64(3, "\6\0\0\0\4\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0@\0\0\0\0\0\0\0"..., 784, 64) = 784
pread64(3, "\4\0\0\0\20\0\0\0\5\0\0\0GNU\0\2\0\0\300\4\0\0\0\3\0\0\0\0\0\0\0", 32, 848) = 32
pread64(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0\30x\346\264ur\f|Q\226\236i\253-'o"..., 68, 880) = 68
mmap(NULL, 2037344, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc19e652000
mmap(0x7fc19e674000, 1540096, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x22000) = 0x7fc19e674000
mmap(0x7fc19e7ec000, 319488, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x19a000) = 0x7fc19e7ec000
mmap(0x7fc19e83a000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1e7000) = 0x7fc19e83a000
mmap(0x7fc19e840000, 13920, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc19e840000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libpcre2-8.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\"\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=588488, ...}) = 0
mmap(NULL, 590632, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc19e5c1000
mmap(0x7fc19e5c3000, 413696, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7fc19e5c3000
mmap(0x7fc19e628000, 163840, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x67000) = 0x7fc19e628000
mmap(0x7fc19e650000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x8e000) = 0x7fc19e650000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 \22\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=18848, ...}) = 0
mmap(NULL, 20752, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc19e5bb000
mmap(0x7fc19e5bc000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1000) = 0x7fc19e5bc000
mmap(0x7fc19e5be000, 4096, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7fc19e5be000
mmap(0x7fc19e5bf000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7fc19e5bf000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\220q\0\0\0\0\0\0"..., 832) = 832
pread64(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0{E6\364\34\332\245\210\204\10\350-\0106\343="..., 68, 824) = 68
fstat(3, {st_mode=S_IFREG|0755, st_size=157224, ...}) = 0
pread64(3, "\4\0\0\0\24\0\0\0\3\0\0\0GNU\0{E6\364\34\332\245\210\204\10\350-\0106\343="..., 68, 824) = 68
mmap(NULL, 140408, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc19e598000
mmap(0x7fc19e59e000, 69632, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x6000) = 0x7fc19e59e000
mmap(0x7fc19e5af000, 24576, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x17000) = 0x7fc19e5af000
mmap(0x7fc19e5b5000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1c000) = 0x7fc19e5b5000
mmap(0x7fc19e5b7000, 13432, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc19e5b7000
close(3)                                = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc19e596000
arch_prctl(ARCH_SET_FS, 0x7fc19e597400) = 0
mprotect(0x7fc19e83a000, 16384, PROT_READ) = 0
mprotect(0x7fc19e5b5000, 4096, PROT_READ) = 0
mprotect(0x7fc19e5bf000, 4096, PROT_READ) = 0
mprotect(0x7fc19e650000, 4096, PROT_READ) = 0
mprotect(0x7fc19e86b000, 4096, PROT_READ) = 0
mprotect(0x5631dcfa1000, 4096, PROT_READ) = 0
mprotect(0x7fc19e8b9000, 4096, PROT_READ) = 0
munmap(0x7fc19e871000, 108451)          = 0
set_tid_address(0x7fc19e5976d0)         = 1003953
set_robust_list(0x7fc19e5976e0, 24)     = 0
rt_sigaction(SIGRTMIN, {sa_handler=0x7fc19e59ebf0, sa_mask=[], sa_flags=SA_RESTORER|SA_SIGINFO, sa_restorer=0x7fc19e5ac420}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {sa_handler=0x7fc19e59ec90, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO, sa_restorer=0x7fc19e5ac420}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
statfs("/sys/fs/selinux", 0x7fff127e11a0) = -1 ENOENT (No such file or directory)
statfs("/selinux", 0x7fff127e11a0)      = -1 ENOENT (No such file or directory)
brk(NULL)                               = 0x5631dcff8000
brk(0x5631dd019000)                     = 0x5631dd019000
openat(AT_FDCWD, "/proc/filesystems", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(3, "nodev\tsysfs\nnodev\ttmpfs\nnodev\tbd"..., 1024) = 393
read(3, "", 1024)                       = 0
close(3)                                = 0
access("/etc/selinux/config", F_OK)     = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=5699248, ...}) = 0
mmap(NULL, 5699248, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fc19e026000
close(3)                                = 0
ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0
ioctl(1, TIOCGWINSZ, {ws_row=24, ws_col=80, ws_xpixel=0, ws_ypixel=0}) = 0
openat(AT_FDCWD, "/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2996, ...}) = 0
read(3, "# Locale name alias data base.\n#"..., 4096) = 2996
read(3, "", 4096)                       = 0
close(3)                                = 0
openat(AT_FDCWD, "/usr/share/locale/en_US.UTF-8/LC_TIME/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en_US.utf8/LC_TIME/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en_US/LC_TIME/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en.UTF-8/LC_TIME/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en.utf8/LC_TIME/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/share/locale/en/LC_TIME/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/usr/lib/x86_64-linux-gnu/gconv/gconv-modules.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=27002, ...}) = 0
mmap(NULL, 27002, PROT_READ, MAP_SHARED, 3, 0) = 0x7fc19e885000
close(3)                                = 0
futex(0x7fc19e83f954, FUTEX_WAKE_PRIVATE, 2147483647) = 0
lstat(".", {st_mode=S_IFDIR|0755, st_size=36864, ...}) = 0
lgetxattr(".", "security.selinux", 0x5631dcffa2c0, 255) = -1 ENODATA (No data available)
getxattr(".", "system.posix_acl_access", NULL, 0) = -1 ENODATA (No data available)
getxattr(".", "system.posix_acl_default", NULL, 0) = -1 ENODATA (No data available)
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3)                                = 0
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3)                                = 0
openat(AT_FDCWD, "/etc/nsswitch.conf", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=542, ...}) = 0
read(3, "# /etc/nsswitch.conf\n#\n# Example"..., 4096) = 542
read(3, "", 4096)                       = 0
close(3)                                = 0
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=108451, ...}) = 0
mmap(NULL, 108451, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fc19e00b000
close(3)                                = 0
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libnss_files.so.2", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\3005\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0644, st_size=51856, ...}) = 0
mmap(NULL, 79672, PROT_READ, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc19e871000
mmap(0x7fc19e874000, 28672, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x3000) = 0x7fc19e874000
mmap(0x7fc19e87b000, 8192, PROT_READ, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xa000) = 0x7fc19e87b000
mmap(0x7fc19e87d000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xb000) = 0x7fc19e87d000
mmap(0x7fc19e87f000, 22328, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7fc19e87f000
close(3)                                = 0
mprotect(0x7fc19e87d000, 4096, PROT_READ) = 0
munmap(0x7fc19e00b000, 108451)          = 0
openat(AT_FDCWD, "/etc/passwd", O_RDONLY|O_CLOEXEC) = 3
lseek(3, 0, SEEK_CUR)                   = 0
fstat(3, {st_mode=S_IFREG|0644, st_size=3452, ...}) = 0
read(3, "root:x:0:0:root:/root:/bin/bash\n"..., 4096) = 3452
close(3)                                = 0
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3)                                = 0
socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3
connect(3, {sa_family=AF_UNIX, sun_path="/var/run/nscd/socket"}, 110) = -1 ENOENT (No such file or directory)
close(3)                                = 0
openat(AT_FDCWD, "/etc/group", O_RDONLY|O_CLOEXEC) = 3
lseek(3, 0, SEEK_CUR)                   = 0
fstat(3, {st_mode=S_IFREG|0644, st_size=1213, ...}) = 0
read(3, "root:x:0:\ndaemon:x:1:\nbin:x:2:\ns"..., 4096) = 1213
close(3)                                = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x3), ...}) = 0
openat(AT_FDCWD, "/etc/localtime", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2852, ...}) = 0
fstat(3, {st_mode=S_IFREG|0644, st_size=2852, ...}) = 0
read(3, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\6\0\0\0\6\0\0\0\0"..., 4096) = 2852
lseek(3, -1810, SEEK_CUR)               = 1042
read(3, "TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\6\0\0\0\6\0\0\0\0"..., 4096) = 1810
close(3)                                = 0
write(1, "drwxr-xr-x 110 ian ian 36864 Jun"..., 44drwxr-xr-x 110 ian ian 36864 Jun 14 15:23 .
) = 44
close(1)                                = 0
close(2)                                = 0
exit_group(0)                           = ?
+++ exited with 0 +++
</details>

[bkatkam123]

uname -a
Linux boldlog 3.10.0-1127.el7.x86_64 #1 SMP Tue Feb 18 16:39:12 EST 2020 x86_64 x86_64 x86_64 GNU/Linux

cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.8 (Maipo)

strace -- version 4.24

We are using this executable in other scripts. While debugging issues with strace.
It is getting stuck due to go executable with syscall.Exec

[ianlancetaylor]

I have no explanation, but it's hard to see how this could be a problem with Go.

I tested with strace version 5.5, though again I don't know why it would matter.

[bkatkam123]

I am looking, if there are any build options which can fix this issue.

[seankhliao]

I couldn't reproduce this on fedora 27 with strace 4.24 and go 1.17 / 1.20

does this issue reproduce with 1.20?

[bkatkam123]

Yes, same issue with 1.20