Date: Mon, 12 May 2025 18:16:50 +0000 From: bugzilla-noreply@freebsd.org To: sysinstall@FreeBSD.org Subject: [Bug 286703] During bsdinstall, pkg hangs outputting to serial console Message-ID: <bug-286703-8135-alcz7IfQo4@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-286703-8135@https.bugs.freebsd.org/bugzilla/> References: <bug-286703-8135@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=286703 Ravi Pokala <rpokala@panasas.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|bin |kern --- Comment #1 from Ravi Pokala <rpokala@panasas.com> --- My colleagues have gathered some additional information: 1. When in the non-responsive state, (some?) kernel messages are still emitted to the serial console. For example, resetting the BMC causes the virtual USB keyboard and mouse to detach and re-attach, and the corresponding messages show up on the console. 2. When in the non-responsive state, it is always waiting on the 't_outwait' condvar in tty.c , which wakes up callers waiting on the TTY. 3. The main paths for triggering that event are 'ttydisc_getc()' or 'ttydisc_getc_uio()' in tty_ttydisc.c , which are in turn called by 'uart_tty_outwakup()' in uart_tty.c . 'uart_tty_outwakeup()' is responsible for draining the TTY buffer and sending the contents to the UART driver. 4. Instrumenting the install, we found that while 'ixon' -- software flow-control -- is enabled, so is 'ixany' -- release the software flow-control pause when any character is input. Our investigation continues. In the mean time, while this was seen in the context of `bsdinstall', this looks like a bug in the UART and/or TTY drivers; 'kern', not 'bin'. -- You are receiving this mail because: You are the assignee for the bug.help
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