[pid   212] openat(AT_FDCWD, "/nix/var/log/nix/drvs/m0//6z3vrj6zdg942psgkvsya6vdx4v8mk-nixos-19.09.789.7952807791d.drv.bz2", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666) = 13
[pid   212] brk(0x233d000)              = 0x233d000
[pid   212] mmap(NULL, 3600384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa13b0da000
[pid   212] mmap(NULL, 3600384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa13ad6b000
[pid   212] mmap(NULL, 266240, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fa13ad2a000
[pid   212] openat(AT_FDCWD, "/dev/ptmx", O_RDWR|O_NOCTTY) = 14
[pid   212] statfs("/dev/pts", {f_type=DEVPTS_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={val=[0, 0]}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NOEXEC|ST_RELATIME}) = 0
[pid   212] ioctl(14, TCGETS, {B38400 opost isig icanon echo ...}) = 0
[pid   212] ioctl(14, TIOCGPTN, [9])    = 0
[pid   212] stat("/dev/pts/9", {st_mode=S_IFCHR|0620, st_rdev=makedev(0x88, 0x9), ...}) = 0
[pid   212] chmod("/dev/pts/9", 0600)   = 0
[pid   212] chown("/dev/pts/9", 30001, 0) = 0
[pid   212] ioctl(14, TIOCSPTLCK, [0])  = 0
[pid   212] openat(AT_FDCWD, "/dev/pts/9", O_RDWR|O_NOCTTY) = 15
[pid   212] ioctl(15, TCGETS, {B38400 opost isig icanon echo ...}) = 0
[pid   212] ioctl(15, SNDCTL_TMR_START or TCSETS, {B38400 -opost -isig -icanon -echo ...}) = 0
[pid   212] pipe2([16, 17], O_CLOEXEC)  = 0
[pid   212] clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLDstrace: Process 218 attached
, child_tidptr=0x7fa1555ffcd0) = 218
[pid   218] set_robust_list(0x7fa1555ffce0, 24 <unfinished ...>
[pid   212] wait4(218,  <unfinished ...>
[pid   218] <... set_robust_list resumed>) = 0
[pid   218] ioctl(2, TCGETS, 0x7ffe3d7b6700) = -1 ENOTTY (Inappropriate ioctl for device)
[pid   218] prctl(PR_SET_PDEATHSIG, SIGKILL) = 0
[pid   218] getuid()                    = 0
[pid   218] setgroups(0, NULL)          = 0
[pid   218] mmap(NULL, 1048576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7fa13ac2a000
[pid   218] clone(child_stack=0x7fa13ad29ff0, flags=CLONE_PARENT|CLONE_NEWNS|CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWUSER|CLONE_NEWPID|CLONE_NEWNET|SIGCHLD) = -1 EPERM (Operation not permitted)
[pid   218] clone(child_stack=0x7fa13ad29ff0, flags=CLONE_PARENT|CLONE_NEWNS|CLONE_NEWUTS|CLONE_NEWIPC|CLONE_NEWPID|CLONE_NEWNET|SIGCHLDstrace: Process 219 attached
) = 219
[pid   219] rt_sigprocmask(SIG_SETMASK, [],  <unfinished ...>
[pid   218] write(15, "219\n", 4 <unfinished ...>
[pid   219] <... rt_sigprocmask resumed>NULL, 8) = 0
[pid   218] <... write resumed>)        = 4
[pid   219] setsid( <unfinished ...>
[pid   218] exit_group(0 <unfinished ...>
[pid   219] <... setsid resumed>)       = 1
[pid   218] <... exit_group resumed>)   = ?
[pid   219] dup2(15, 2)                 = 2
[pid   219] dup2(2, 1)                  = 1
[pid   219] openat(AT_FDCWD, "/dev/null", O_RDWR) = 18
[pid   219] dup2(18, 0)                 = 0
[pid   219] close(18)                   = 0
[pid   218] +++ exited with 0 +++
[pid   212] <... wait4 resumed>[{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 218
[pid   212] --- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=218, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
[pid   212] close(16)                   = 0
[pid   212] read(14, "2", 1)            = 1
[pid   212] read(14, "1", 1)            = 1
[pid   212] read(14, "9", 1)            = 1
[pid   212] read(14, "\n", 1)           = 1
[pid   219] prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) = 0
[pid   212] openat(AT_FDCWD, "/proc/219/uid_map", O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0666 <unfinished ...>
[pid   219] seccomp(SECCOMP_SET_MODE_STRICT, 1, NULL) = -1 EINVAL (Invalid argument)
[pid   212] <... openat resumed>)       = 16
[pid   219] seccomp(SECCOMP_SET_MODE_FILTER, 0, {len=45, filter=0x2323470} <unfinished ...>
[pid   212] write(16, "1000 30001 1", 12) = -1 EPERM (Operation not permitted)
[pid   219] <... seccomp resumed>)      = 0
[pid   219] close(17)                   = 0
[pid   212] close(16)                   = 0
[pid   219] read(16,  <unfinished ...>
[pid   212] kill(-219, SIGKILL <unfinished ...>
[pid   219] <... read resumed> <unfinished ...>) = ?
[pid   212] <... kill resumed>)         = 0