Date: Tue, 9 Dec 2014 13:18:54 +1100 From: Jan Mikkelsen <janm@transactionware.com> To: Konstantin Belousov <kostikbel@gmail.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: <AC807484-921F-4896-9B54-93E78FB3F189@transactionware.com> In-Reply-To: <20141205095659.GF97072@kib.kiev.ua> References: <F8A3069F-B662-46B8-85BF-2F0A7AE994E0@transactionware.com> <20141205095659.GF97072@kib.kiev.ua>
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Hi, > On 5 Dec 2014, at 20:57, Konstantin Belousov <kostikbel@gmail.com> wrote: > > 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. These resolved the problem. Applying these changes to stable/10 seems like it would be a good idea. Thanks! Jan. >> >> 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" > _______________________________________________ > 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"help
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