Date: Wed, 28 Sep 2011 13:55:48 GMT From: Martin Simmons <martin@lispworks.com> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/161097: Unkillable process hanging waiting for "exithold" when p_lock is 1 Message-ID: <201109281355.p8SDtmAA050821@red.freebsd.org> Resent-Message-ID: <201109281400.p8SE0JYN068970@freefall.freebsd.org>
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>Number: 161097 >Category: kern >Synopsis: Unkillable process hanging waiting for "exithold" when p_lock is 1 >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Wed Sep 28 14:00:18 UTC 2011 >Closed-Date: >Last-Modified: >Originator: Martin Simmons >Release: 7.4-RELEASE-p2 >Organization: >Environment: Self-build kernel from GENERIC conf + 1 tiny nfs patch FreeBSD greig.cam.lispworks.com 7.4-RELEASE-p2 FreeBSD 7.4-RELEASE-p2 #0: Thu Sep 15 11:32:16 BST 2011 martin@greig.cam.lispworks.com:/usr/obj/usr/src/sys/LOCALGENERIC i386 >Description: A process, which should have exited, is hanging and procstat reports PID PPID PGID SID TSID THR LOGIN WCHAN EMUL COMM 37462 37460 31946 31946 0 1 martin exithold FreeBSD ELF32 devel-gtk-shaken procstat -k prints nothing for this process, but kgdb gives the following: (kgdb) where #0 sched_switch (td=0xc5e5d480, newtd=Variable "newtd" is not available. ) at /usr/src/sys/kern/sched_ule.c:1944 #1 0xc08246f6 in mi_switch (flags=Variable "flags" is not available. ) at /usr/src/sys/kern/kern_synch.c:444 #2 0xc085153b in sleepq_switch (wchan=Variable "wchan" is not available. ) at /usr/src/sys/kern/subr_sleepqueue.c:497 #3 0xc0851b86 in sleepq_wait (wchan=0xc62e5a08) at /usr/src/sys/kern/subr_sleepqueue.c:580 #4 0xc0824b79 in _sleep (ident=0xc62e5a08, lock=0xc62e58d0, priority=92, wmesg=0xc0bd061f "exithold", timo=0) at /usr/src/sys/kern/kern_synch.c:230 #5 0xc07f362b in exit1 (td=0xc5e5d480, rv=0) at /usr/src/sys/kern/kern_exit.c:208 #6 0xc07f4eed in sys_exit (td=Could not find the frame base for "sys_exit". ) at /usr/src/sys/kern/kern_exit.c:110 #7 0xc0b2a005 in syscall (frame=0xe7cf7d38) at /usr/src/sys/i386/i386/trap.c:1101 #8 0xc0b0d010 in Xint0x80_syscall () at /usr/src/sys/i386/i386/exception.s:262 #9 0x00000033 in ?? () (kgdb) up 5 #5 0xc07f362b in exit1 (td=0xc5e5d480, rv=0) at /usr/src/sys/kern/kern_exit.c:208 208 msleep(&p->p_lock, &p->p_mtx, PWAIT, "exithold", 0); (kgdb) p p->p_lock $5 = 1 '\001' (kgdb) >How-To-Repeat: I don't know how to repeat it. This process runs every night, but this is the first time I've seen it hang like this. >Fix: >Release-Note: >Audit-Trail: >Unformatted:
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