Date: Tue, 02 Jun 2026 12:29:30 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 295792] cu(1) panics kernel if the devices detaches before successfully connecting Message-ID: <bug-295792-227@https.bugs.freebsd.org/bugzilla/>
index | next in thread | raw e-mail
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=295792 Bug ID: 295792 Summary: cu(1) panics kernel if the devices detaches before successfully connecting Product: Base System Version: Unspecified Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: christos@freebsd.org To reproduce: 1. Plug a serial device, in my case I use a uchcom(4) and umodem(4) to test. 2. Run `cu -l /dev/cuaU0` (or whatever the device node is) 3. Unplug the device right away, before cu(1) prints "Connected". Sample panic message: panic: Assertion !tty_gone(tp) failed at /mnt/src/sys/sys/ttydevsw.h:165 cpuid = 5 time = 1780410393 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe008d91d7b0 vpanic() at vpanic+0x13f/frame 0xfffffe008d91d8e0 panic() at panic+0x43/frame 0xfffffe008d91d940 ttydevsw_modem() at ttydevsw_modem+0x38/frame 0xfffffe008d91d950 ttydev_open() at ttydev_open+0x2bc/frame 0xfffffe008d91d9a0 devfs_open() at devfs_open+0x12f/frame 0xfffffe008d91da10 VOP_OPEN_APV() at VOP_OPEN_APV+0x55/frame 0xfffffe008d91da40 vn_open_vnode() at vn_open_vnode+0x180/frame 0xfffffe008d91dac0 vn_open_cred() at vn_open_cred+0x62e/frame 0xfffffe008d91dc40 openatfp() at openatfp+0x2c6/frame 0xfffffe008d91dda0 sys_openat() at sys_openat+0x45/frame 0xfffffe008d91ddd0 filemon_wrapper_openat() at filemon_wrapper_openat+0x15/frame 0xfffffe008d91de00 amd64_syscall() at amd64_syscall+0x16c/frame 0xfffffe008d91df30 fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe008d91df30 --- syscall (499, FreeBSD ELF64, openat), rip = 0x16eb102b9fea, rsp = 0x16eb0fa25ef8, rbp = 0x16eb0fa25ff0 --- KDB: enter: panic [ thread pid 6285 tid 100154 ] Stopped at kdb_enter+0x33: movq $0,0x161c3b2(%rip) db> -- You are receiving this mail because: You are the assignee for the bug.home | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?bug-295792-227>