Kyle Evans <kev...@freebsd.org> added the comment:
I think it's too early to look at this, I'll circle back another time. :-) I
got a minute and extracted the relevant test, but I guess there must have been
some fundamental transcription error:
import os
fd = os.memfd_create("Hi", os.MFD_CLOEXEC)
if fd == -1:
print("boo")
os.exit(1)
if os.get_inheritable(fd):
print("inheritable, boo")
os.exit(1)
with open(fd, "wb", closefd=False) as f:
f.write(b'memfd_create')
if f.tell() != 12:
print("Hork")
os.exit(1)
print("What?")
print("Done")
When I run this with python3.9, I get:
...
3038 100554: shm_open2(SHM_ANON,O_RDWR|O_CLOEXEC,00,0,"memfd:Hi") = 3 (0x3)
3038 100554: fcntl(3,F_GETFD,) = 1 (0x1)
3038 100554: fstat(3,{ mode=---------- ,inode=10,size=0,blksize=4096 }) = 0
(0x0)
3038 100554: ioctl(3,TIOCGETA,0x7fffffffe2a0) ERR#25 'Inappropriate ioctl
for device'
3038 100554: lseek(3,0x0,SEEK_CUR) = 0 (0x0)
3038 100554: lseek(3,0x0,SEEK_CUR) = 0 (0x0)
3038 100554: write(3,"memfd_create",12) = 0 (0x0)
3038 100554: write(3,"memfd_create",12) = 0 (0x0)
3038 100554: write(3,"memfd_create",12) = 0 (0x0)
3038 100554: write(3,"memfd_create",12) = 0 (0x0)
3038 100554: write(3,"memfd_create",12) = 0 (0x0)
(ad infinitum)
So in my local repro, Python is looping forever on successful write() for
reasons I'm not immediately sure of.
----------
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41013>
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