#1150271 openssh-sftp-server: sftp-server fails silently with return code 11 on arm64 (Raspberry Pi4)

Package:
openssh-sftp-server
Source:
openssh-sftp-server
Description:
secure shell (SSH) sftp server module, for SFTP access from remote machines
Submitter:
Jean-Luc Dalous
Date:
2026-10-07 20:17:03 UTC
Severity:
normal
#1150271#5
Date:
2026-10-07 20:14:15 UTC
From:
To:
Steps to reproduce:
printf '3\n\n1\n\n' | /usr/lib/openssh/sftp-server; echo $? → rc=11, no output at all.
No error is logged by sshd or the kernel. Switching to Subsystem sftp internal-sftp in sshd_config fully works around the issue, which suggests a problem in the external binary (possibly its seccomp sandbox on arm64).