I am not an expert. Here is the end of strace before the program locks up.
pipe2([430, 441], 0) = 0
fcntl(441, F_DUPFD_CLOEXEC, 0) = 443
close(441) = 0
sendmsg(136, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\1\0\0\377\1\0\24\0\7\0\0\0STRING\0\0", iov_len=20}], msg_iovlen=1, msg_control=[{cmsg_len=20, cmsg_level=SOL_SOCKET, cmsg_type=SCM_RIGHTS, cmsg_data=[443]}], msg_controllen=20, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 20
close(443) = 0
sendmsg(136, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\1\0\0\0\0\0\f\0001\0\0\0", iov_len=12}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_DONTWAIT|MSG_NOSIGNAL) = 12
poll([{fd=136, events=POLLIN}], 1, -1) = 1 ([{fd=136, revents=POLLIN}])
recvmsg(136, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="1\0\0\0\0\0\f\0v{\0\0\1\0\0\0\1\0\f\0001\0\0\0", iov_len=1656}, {iov_base="", iov_len=2440}], msg_iovlen=2, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = 24
recvmsg(136, {msg_namelen=0}, MSG_DONTWAIT|MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resursen tillfälligt otillgänglig)
read(430,
The call to read never returns.
If I read correctly (and it is very possible I don’t!!) brave creates the two file descriptors of a pipe (430 read, 441 write). It duplicates the write pipe (443) and sets some flag (CLOEXEC). then closes the original descriptor (441), leaving only the duplicate. Then closes the duplicate too (443). Then attempts to read from the read end (430) where nothing happens, since all write ends were closed.
It looks like Brave wants to run a command and capture the output but changes its mind about running the command.
