Date: Fri, 18 Jun 2004 13:22:04 +0200 (CEST) From: Juan.Fco.Rodriguez.Hervella@cimborrio.ipv6.it.uc3m.es, jrh@it.uc3m.es To: FreeBSD-gnats-submit@FreeBSD.org Subject: kern/68076: Page fault when the sequence "kldunload ucom", "kldunload uplcom" is executed Message-ID: <200406181122.i5IBM4gE000874@cimborrio.ipv6.it.uc3m.es> Resent-Message-ID: <200406181130.i5IBUVg0090537@freefall.freebsd.org>
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>Number: 68076
>Category: kern
>Synopsis: Page fault when the sequence "kldunload ucom", "kldunload uplcom" is executed
>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: Fri Jun 18 11:30:27 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator: Juan Fco Rodriguez Hervella
>Release: FreeBSD 4.10-STABLE i386
>Organization:
University Carlos III of Madrid (Spain)
>Environment:
System: FreeBSD cimborrio.ipv6.it.uc3m.es 4.10-STABLE FreeBSD 4.10-STABLE #7: Fri May 28 17:23:51 CEST 2004 root@cimborrio.ipv6.it.uc3m.es:/usr/src/sys/compile/JUANILLO i386
hp/compaq nx9010
>Description:
I've got a USB to serial cable. It works quite well. When I unload "uplcom",
there is no problem, and automatically the "ucom" module dissapears. When
I do it the other way, firstly "kldunload ucom" and afterwards "kldunload uplcom",
a page faul appears and the laptop reboots. I've made a small debugging and
the problem seems to be that it tries to unload the "ucom" driver, because it's
a dependency, but it doesn't find it and something goes wrong... This is
an excerpt of the debugging, in case it helps:
(kgdb) bt
#0 dumpsys () at ../../kern/kern_shutdown.c:487
#1 0xc026b17f in boot (howto=256) at ../../kern/kern_shutdown.c:316
#2 0xc026b5a4 in poweroff_wait (junk=0xc047e26c, howto=-1069032081) at ../../kern/kern_shutdown.c:595
#3 0xc03e2d5a in trap_fatal (frame=0xcc76beac, eva=334) at ../../i386/i386/trap.c:974
#4 0xc03e2a2d in trap_pfault (frame=0xcc76beac, usermode=0, eva=334) at ../../i386/i386/trap.c:867
#5 0xc03e25eb in trap (frame={tf_fs = 16, tf_es = -864681968, tf_ds = -1071251440, tf_edi = 0, tf_esi = -1061824384,
tf_ebp = -864633092, tf_isp = -864633128, tf_ebx = 1, tf_edx = 318, tf_ecx = -868313824, tf_eax = 0, tf_trapno = 12,
tf_err = 2, tf_eip = -1071271779, tf_cs = 8, tf_eflags = 66050, tf_esp = 1, tf_ss = -1061824128})
at ../../i386/i386/trap.c:466
#6 0xc025b09d in linker_file_unload (file=0xc0b5d880) at ../../kern/kern_linker.c:438
#7 0xc025b0df in linker_file_unload (file=0xc0b5d980) at ../../kern/kern_linker.c:442
#8 0xc025b4d5 in kldunload (p=0xcc3e9520, uap=0xcc76bf80) at ../../kern/kern_linker.c:713
#9 0xc03e3009 in syscall2 (frame={tf_fs = 47, tf_es = 47, tf_ds = 47, tf_edi = 2, tf_esi = -1077936790,
tf_ebp = -1077937072, tf_isp = -864632876, tf_ebx = 0, tf_edx = 0, tf_ecx = 0, tf_eax = 305, tf_trapno = 12,
tf_err = 2, tf_eip = 134514400, tf_cs = 31, tf_eflags = 647, tf_esp = -1077938172, tf_ss = 47})
at ../../i386/i386/trap.c:1175
#10 0xc03d3b95 in Xint0x80_syscall ()
#11 0x804813e in ?? ()
...
#7 0xc025b0df in linker_file_unload (file=0xc0b5d980) at ../../kern/kern_linker.c:442
442 linker_file_unload(file->deps[i]);
(kgdb) list
437
438 TAILQ_REMOVE(&linker_files, file, link);
439 lockmgr(&lock, LK_RELEASE, 0, curproc);
440
441 for (i = 0; i < file->ndeps; i++)
442 linker_file_unload(file->deps[i]);
443 free(file->deps, M_LINKER);
444
445 for (cp = STAILQ_FIRST(&file->common); cp;
446 cp = STAILQ_FIRST(&file->common)) {
I think the function call "linker_file_upload(file->deps[1])"
is a non-sense. Look:
kgdb) p *(linker_file_t)file->deps[1]
$4 = {refs = -1061824257, userrefs = 0, flags = 0, link = {tqe_next = 0x13e, tqe_prev = 0x0}, filename = 0x0, id = 0,
address = 0x0, size = 10, ndeps = 0, deps = 0x0, common = {stqh_first = 0x0, stqh_last = 0x0}, modules = {
tqh_first = 0x0, tqh_last = 0x0}, priv = 0x0, ops = 0x0}
(kgdb)
Hope this helps. Thank you.
>How-To-Repeat:
kldunload ucom
kldunload uplcom
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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