frida-server Unable to preload error message on start

[gorelics]

Just trying to launch latest frida-server 12.4.7 on android 9 AOSP v6.4 3.4.113-xren Magisk
getenforce Permissive

# /system/xbin/frida-server -l 0.0.0.0

gives me
Unable to preload: Unable to access process with pid 614 (zygote) due to system restrictions; try sudo sysctl kernel.yama.ptrace_scope=0, or run Frida as root

logcat output:

04-02 15:38:32.509 224 224 I SELinux : SELinux: Loaded service_contexts from: 04-02 15:38:32.509 224 224 I SELinux : /plat_service_contexts 04-02 15:38:32.509 224 224 I SELinux : /vendor_service_contexts 04-02 15:38:32.509 224 224 I SELinux : avc: received policyload notice (seqno=6)
Any tips how to troubleshoot this issue. Thanks

[gorelics]

strace -f -s 128 frida-server output:

23714 readlinkat(AT_FDCWD, "/proc/614/exe", "/system/bin/app_process32", 256) = 25
23714 mknodat(AT_FDCWD, "/data/local/tmp/re.frida.server/linjector-3", S_IFIFO|0666) = 0
23714 fchmodat(AT_FDCWD, "/data/local/tmp/re.frida.server/linjector-3", 0666) = 0
23714 setxattr("/data/local/tmp/re.frida.server/linjector-3", "security.selinux", "u:object_r:frida_file:s0", 25, 0) = 0
23714 openat(AT_FDCWD, "/data/local/tmp/re.frida.server/linjector-3", O_RDONLY|O_NONBLOCK|O_LARGEFILE) = 8
-23714 **ptrace(PTRACE_SEIZE, 614, NULL, PTRACE_O_TRACEEXEC) = -1 EPERM (Operation not permitted)**
-23714 ptrace(PTRACE_GETREGS, 614, NULL, 0xbe844584) = -1 ESRCH (No such process)
23714 futex(0xb6eb0d6c, FUTEX_WAKE_PRIVATE, 2147483647) = 0
23714 close(8)                          = 0
23714 unlinkat(AT_FDCWD, "/data/local/tmp/re.frida.server/linjector-3", 0) = 0
23714 ppoll([{fd=3, events=POLLIN}, {fd=7, events=POLLIN}], 2, {tv_sec=0, tv_nsec=0}, NULL, 0) = 0 (Timeout)
23714 write(6, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
23719 <... ppoll resumed> )             = 1 ([{fd=6, revents=POLLIN}])
23719 futex(0xb65ec3f0, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
23714 <... write resumed> )             = 8
23714 futex(0xb65ec3f0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
23719 <... futex resumed> )             = 0
23719 read(6, "\1\0\0\0\0\0\0\0", 16)   = 8
23719 futex(0xb65ec3f0, FUTEX_WAKE_PRIVATE, 1) = 0
23719 futex(0xb65f6930, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
23714 <... futex resumed> )             = 1
23714 futex(0xb65f6930, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
23719 <... futex resumed> )             = 0
23719 futex(0xb65f6930, FUTEX_WAKE_PRIVATE, 1) = 0
23719 futex(0xb65b3064, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
23714 <... futex resumed> )             = 1
23714 futex(0xb65b3064, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
23719 <... futex resumed> )             = 0
23719 futex(0xb65b3064, FUTEX_WAKE_PRIVATE, 1) = 0
23719 clock_gettime(CLOCK_MONOTONIC, {tv_sec=12309, tv_nsec=934666747}) = 0
23719 clock_gettime(CLOCK_MONOTONIC, {tv_sec=12309, tv_nsec=934762997}) = 0
23719 sendmsg(5, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\3\1\1\211\0\0\0\3\0\0\0008\0\0\0\10\1g\0\1s\0\0\4\1s\0\37\0\0\0re.frida.Error.PermissionDenied\0\5\1u\0\3\0\0\0\204\0\0\0Unable to access process with pid 614 due to system "..., iov_len=209}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 209
23718 <... ppoll resumed> )             = 1 ([{fd=9, revents=POLLIN}])
23719 ppoll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, {tv_sec=0, tv_nsec=0}, NULL, 0 <unfinished ...>
23718 write(10, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
23719 <... ppoll resumed> )             = 0 (Timeout)
23718 <... write resumed> )             = 8
23719 ppoll([{fd=5, events=POLLIN}, {fd=6, events=POLLIN}], 2, NULL, NULL, 0 <unfinished ...>
23718 clock_gettime(CLOCK_MONOTONIC, {tv_sec=12309, tv_nsec=935375706}) = 0
23718 recvmsg(9, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\3\1\1\211\0\0\0\3\0\0\0008\0\0\0", iov_len=16}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 16
23718 clock_gettime(CLOCK_MONOTONIC, {tv_sec=12309, tv_nsec=935650290}) = 0
23718 ppoll([{fd=9, events=POLLIN}], 1, {tv_sec=0, tv_nsec=0}, NULL, 0) = 1 ([{fd=9, revents=POLLIN}], left {tv_sec=0, tv_nsec=0})
23718 clock_gettime(CLOCK_MONOTONIC, {tv_sec=12309, tv_nsec=935888779}) = 0
23718 recvmsg(9, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\10\1g\0\1s\0\0\4\1s\0\37\0\0\0re.frida.Error.PermissionDenied\0\5\1u\0\3\0\0\0\204\0\0\0Unable to access process with pid 614 due to system restrictions; tr"..., iov_len=193}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 193
23718 write(10, "\1\0\0\0\0\0\0\0", 8)  = 8
23718 write(10, "\1\0\0\0\0\0\0\0", 8)  = 8
23718 ppoll([{fd=8, events=POLLIN}, {fd=10, events=POLLIN}], 2, {tv_sec=0, tv_nsec=0}, NULL, 0) = 1 ([{fd=10, revents=POLLIN}], left {tv_sec=0, tv_nsec=0})
23718 read(10, "\3\0\0\0\0\0\0\0", 16)  = 8
23718 write(5, "\1\0\0\0\0\0\0\0", 8)   = 8
23718 clock_gettime(CLOCK_MONOTONIC, {tv_sec=12309, tv_nsec=936774040}) = 0
23718 ppoll([{fd=9, events=POLLIN}], 1, {tv_sec=0, tv_nsec=0}, NULL, 0) = 0 (Timeout)
23718 write(10, "\1\0\0\0\0\0\0\0", 8)  = 8
23718 ppoll([{fd=8, events=POLLIN}, {fd=9, events=POLLIN}, {fd=10, events=POLLIN}], 3, NULL, NULL, 0) = 1 ([{fd=10, revents=POLLIN}])
23718 read(10, "\1\0\0\0\0\0\0\0", 16)  = 8
23718 ppoll([{fd=8, events=POLLIN}, {fd=9, events=POLLIN}, {fd=10, events=POLLIN}], 3, NULL, NULL, 0 <unfinished ...>
23709 <... ppoll resumed> )             = 1 ([{fd=5, revents=POLLIN}], left {tv_sec=24, tv_nsec=551554857})
23709 read(5, "\1\0\0\0\0\0\0\0", 16)   = 8
23709 clock_gettime(CLOCK_MONOTONIC, {tv_sec=12309, tv_nsec=937558831}) = 0
23709 futex(0xa773ed60, FUTEX_WAKE_PRIVATE, 2147483647) = 0
23709 unlinkat(AT_FDCWD, "/data/local/tmp/re.frida.server/pipe-dede671847ad5d455439d54f9d5229cd", 0) = 0
23709 ppoll([{fd=3, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 4, {tv_sec=0, tv_nsec=0}, NULL, 0) = 0 (Timeout)
23709 futex(0xa773ed18, FUTEX_WAKE_PRIVATE, 2147483647) = 0
23709 clock_gettime(CLOCK_MONOTONIC, {tv_sec=12309, tv_nsec=938252529}) = 0
23709 futex(0xa773ec88, FUTEX_WAKE_PRIVATE, 2147483647) = 0
23709 write(2, "Unable to preload: Unable to access process with pid 614 due to system restrictions; try `sudo sysctl kernel.yama.ptrace_scope=0"..., 152) = 152
23709 futex(0xa773ecd0, FUTEX_WAKE_PRIVATE, 2147483647) = 0
23709 ppoll([{fd=3, events=POLLIN}, {fd=5, events=POLLIN}, {fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 4, NULL, NULL, 0 <unfinished ...>
23714 <... futex resumed> )             = 1
23714 ppoll([{fd=3, events=POLLIN}, {fd=7, events=POLLIN}], 2, NULL, NULL, 0 <unfinished ...>
23716 <... futex resumed> )             = -1 ETIMEDOUT (Connection timed out)

>> Full strace log here <<

[gorelics]

>>Using strace on zygote <<

[gorelics]

Problem was the latest Magisk 19.0, whose MagiskHide module attaches to zygote process with the ptrace

[jc911]

Same problem like you. This really help me. Thank you!

[beordle]

Fuck! This really help me.

[foxundermoon]

magiskhide  disable
MagiskHide is not enabled

i am disable magiskhide but still fail run frida-server .

./fridas -v
Unable to preload: Unable to access zygote while preparing for app launch; try disabling Magisk Hide in case it is active

how to resolve