On Wed, 15 May 2024 12:33:24 +0200 Jiri Slaby <jirislaby@xxxxxxxxxx> wrote: > I can repro even with 4.19: Huh! I managed to make it happen on Debian's 4.19.67 kernel. I had to redirect stdout/stderr to a file because printing to the terminal slowed down the writes enough to prevent it from happening for me. I guess it's hardware-dependent because I can't reproduce it on kernel 6.6 on a Raspberry Pi. > > So I guess it was introduced sometime between 4.19.67 and 5.10.209. > > I'll take a look to see if I can do a git bisect. > Were you able to do so? Unfortunately not; the older kernels failed to compile on my machine and since I'm not a kernel developer and don't actually use any software that relies on N_HDLC, I gave up... sorry. Regards, Dianne.