https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=42597
Bug ID: 42597
Summary: Pass SSH-level timeouts to SFTP file transport
Initiative type: ---
Sponsorship ---
status:
Product: Koha
Version: Main
Hardware: All
OS: All
Status: NEW
Severity: enhancement
Priority: P5 - low
Component: Architecture, internals, and plumbing
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
Koha::File::Transport::SFTP constructs Net::SFTP::Foreign with timeout =>
DEFAULT_TIMEOUT ( currently hard coded to 10 seconds ), which only governs
per-I/O reads from the underlying ssh child. It does not bound the SSH protocol
handshake.
When a remote sshd accepts the TCP connection but stalls during key exchange,
ssh sits in tcp_recvmsg waiting for the next handshake message and the Perl
parent waits with it but the module timeout never fires because no I/O is
happening. It just sits forever.
An strace of a process in this state looks like:
select(16, [9], NULL, NULL, {tv_sec=0, tv_usec=119055}) = 0 (Timeout)
wait4(59926, 0x7ffe587503e4, WNOHANG, NULL) = 0
select(16, [9], NULL, NULL, {tv_sec=1, tv_usec=0}) = 0 (Timeout)
wait4(59926, 0x7ffe587503e4, WNOHANG, NULL) = 0
select(16, [9], NULL, NULL, {tv_sec=1, tv_usec=0}) = 0 (Timeout)
wait4(59926, 0x7ffe587503e4, WNOHANG, NULL) = 0
select(16, [9], NULL, NULL, {tv_sec=1, tv_usec=0}) = 0 (Timeout)
wait4(59926, 0x7ffe587503e4, WNOHANG, NULL) = 0
select(16, [9], NULL, NULL, {tv_sec=1, tv_usec=0}) = 0 (Timeout)
wait4(59926, 0x7ffe587503e4, WNOHANG, NULL) = 0
select(16, [9], NULL, NULL, {tv_sec=1, tv_usec=0}) = 0 (Timeout)
wait4(59926, 0x7ffe587503e4, WNOHANG, NULL) = 0
select(16, [9], NULL, NULL, {tv_sec=1, tv_usec=0}) = 0 (Timeout)
wait4(59926, 0x7ffe587503e4, WNOHANG, NULL) = 0
select(16, [9], NULL, NULL, {tv_sec=1, tv_usec=0}) = 0 (Timeout)
wait4(59926, 0x7ffe587503e4, WNOHANG, NULL) = 0
select(16, [9], NULL, NULL, {tv_sec=1, tv_usec=0}) = 0 (Timeout)
wait4(59926, 0x7ffe587503e4, WNOHANG, NULL) = 0
select(16, [9], NULL, NULL, {tv_sec=1, tv_usec=0}) = 0 (Timeout)
wait4(59926, 0x7ffe587503e4, WNOHANG, NULL) = 0
select(16, [9], NULL, NULL, {tv_sec=1, tv_usec=0}) = 0 (Timeout)
wait4(59926, 0x7ffe587503e4, WNOHANG, NULL) = 0
select(16, [9], NULL, NULL, {tv_sec=1, tv_usec=0}) = 0 (Timeout)
wait4(59926, 0x7ffe587503e4, WNOHANG, NULL) = 0
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