Date: Fri, 5 Dec 2014 11:57:00 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Jan Mikkelsen <janm@transactionware.com> Cc: marcel@freebsd.org, FreeBSD Stable Mailing List <freebsd-stable@freebsd.org> Subject: Re: 10.1 regression: process using serial port becomes unkillable when no modem control signals Message-ID: <20141205095659.GF97072@kib.kiev.ua> In-Reply-To: <F8A3069F-B662-46B8-85BF-2F0A7AE994E0@transactionware.com> References: <F8A3069F-B662-46B8-85BF-2F0A7AE994E0@transactionware.com>
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On Fri, Dec 05, 2014 at 06:44:51PM +1100, Jan Mikkelsen wrote: > Hi, > > I have just found this problem on a machine upgraded to 10.1. > > When running mgetty on a serial port with nothing connected and then killing it the process becomes unkillable. This prevents ???shutdown -r??? from completing, which is particularly annoying. > > Giving the serial port a device which provides the right modem control signals lets the process exit immediately. The same hardware with 9.3 was fine. > > Below is the kernel stack trace on the unkillable process. > > Does this ring any bells for anyone? This sounds as something that might be fixed by r272786 and r272789 in HEAD. I did not looked into details too close. The changes are not in stable/10, apply manually and test. > > Thanks, > > Jan Mikkelsen > > (kgdb) bt > #0 sched_switch (td=0xfffff80236e1a920, newtd=<value optimized out>, flags=<value optimized out>) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/sched_ule.c:1945 > #1 0xffffffff80939ba1 in mi_switch (flags=260, newtd=0x0) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/kern_synch.c:494 > #2 0xffffffff80976d6b in sleepq_catch_signals (wchan=0xfffff8000c7344b8, pri=0) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/subr_sleepqueue.c:426 > #3 0xffffffff80976c1f in sleepq_wait_sig (wchan=0x0, pri=0) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/subr_sleepqueue.c:631 > #4 0xffffffff808e345a in _cv_wait_sig (cvp=0xfffff8000c7344b8, lock=0xfffff8000c734408) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/kern_condvar.c:258 > #5 0xffffffff809957a5 in ttydev_leave (tp=0xfffff8000c734400) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/tty.c:1392 > #6 0xffffffff80994d30 in ttydev_close (dev=<value optimized out>, fflag=0, devtype=0, td=0x0) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/tty.c:353 > #7 0xffffffff8081ec63 in devfs_close (ap=0xfffffe0c541d57e0) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/fs/devfs/devfs_vnops.c:592 > #8 0xffffffff80e6d281 in VOP_CLOSE_APV (vop=<value optimized out>, a=<value optimized out>) at vnode_if.c:535 > #9 0xffffffff809df673 in vn_close (vp=0xfffff80236a6f588, flags=3, file_cred=0xfffff806a300b200, td=0xfffff80236e1a920) at vnode_if.h:225 > #10 0xffffffff809de4c8 in vn_closefile (fp=0xfffff8001243d9b0, td=0xfffff80236e1a920) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/vfs_vnops.c:1557 > #11 0xffffffff808204bc in devfs_close_f (fp=0xfffff8001243d9b0, td=0x0) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/fs/devfs/devfs_vnops.c:611 > #12 0xffffffff808ed249 in _fdrop (fp=0xfffff8001243d9b0, td=0x0) at file.h:343 > #13 0xffffffff808ef9ae in closef (fp=<value optimized out>, td=<value optimized out>) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/kern_descrip.c:2335 > #14 0xffffffff808ef5c9 in fdescfree (td=0xfffff80236e1a920) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/kern_descrip.c:2103 > #15 0xffffffff808fb8fb in exit1 (td=0xfffff80236e1a920, rv=<value optimized out>) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/kern_exit.c:329 > #16 0xffffffff808fb37e in sys_sys_exit (td=0x0, uap=<value optimized out>) at /usr/home/janm/p4/freebsd-image-std-2014.2/FreeBSD/src/sys/kern/kern_exit.c:153 > #17 0xffffffff80d4f521 in amd64_syscall (td=0xfffff80236e1a920, traced=0) at subr_syscall.c:134 > > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"
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